Cardiovascular

Irregular ventricular filling produces beats too weak to generate a peripheral pulse, creating a pulse deficit.

In atrial fibrillation the atria do not contract, causing blood stasis with embolic risk and loss of the atrial contribution to ventricular filling.

Cardiac auscultation uses five standard sites, positioned where sound from each valve is transmitted best rather than directly over the valve itself. The aortic area is the second intercostal space at the right sternal border, and the pulmonic area the second intercostal space at the left sternal border; together these form the base of the heart. Erb's point, at the third intercostal space on the left sternal border, is where both S1 and S2 are heard well. The tricuspid area is at the fourth or fifth intercostal space at the left sternal border, and the mitral or apical area at the fifth intercostal space in the midclavicular line, where S1 is loudest and where the apical impulse is normally felt. S1 marks closure of the mitral and tricuspid valves at the start of systole, and S2 closure of the aortic and pulmonic valves. Murmurs are described by timing, location, radiation, intensity and quality, and are auscultated with both diaphragm, for higher-pitched sounds, and bell, for lower-pitched sounds such as S3 and S4. An apical pulse is counted at the mitral area for a full minute, and is the required assessment before administering digoxin.

Bundle branch block delays intraventricular conduction, widening the QRS without affecting the PR interval.

Cardiopulmonary bypass produces bleeding, electrolyte-driven dysrhythmias and embolic risk, and a chest tube that stops draining may indicate tamponade.

Synchronization avoids the vulnerable repolarization period, and pre-cardioversion anticoagulation prevents embolic stroke.

Elective cardioversion requires prior anticoagulation and sedation-standard fasting.

Ventricular fibrillation is disorganized electrical activity in which the ventricles quiver rather than contract, so there is no cardiac output and no pulse. It is the commonest initial rhythm in adult cardiac arrest and it is fatal within minutes untreated. The distinction from synchronized cardioversion is worth holding clearly because it is a single condition: cardioversion times the shock to the R wave, avoiding the relative refractory period of the T wave where a shock can itself induce fibrillation, and it is used for organized but unstable tachyarrhythmias — unstable atrial fibrillation or flutter, and ventricular tachycardia with a pulse. Defibrillation is unsynchronized and is used where there is no organized rhythm to time to: ventricular fibrillation, and pulseless ventricular tachycardia. The other rule that follows from this: asystole and pulseless electrical activity are not shockable at all, because there is no fibrillation to terminate.

Potassium and calcium abnormalities produce characteristic electrocardiographic changes that often precede laboratory confirmation.

Ambulatory electrocardiographic monitoring records cardiac rhythm continuously during ordinary activity, most commonly over 24 to 48 hours, to capture intermittent arrhythmia that a resting electrocardiogram will not show. Its value depends on two things: the recording being continuous, and a record of what the client was doing when any abnormality occurred. Client teaching therefore covers maintaining usual daily activity including work and exercise as tolerated, keeping a diary of activities, symptoms such as palpitations, dizziness, chest discomfort or breathlessness, and the exact times of each, and pressing the event marker where the device has one while continuing the activity. The equipment is kept dry, so bathing, showering and swimming are avoided, and electrodes are not removed or repositioned by the client. Sources of electromagnetic interference including electric blankets, magnets, metal detectors and some electrical equipment are avoided. Skin irritation under electrodes is reported rather than self-managed. Longer-term options include event recorders activated by the client, patch monitors worn for up to two weeks, and implantable loop recorders where episodes are infrequent.

Implantable defibrillators are vulnerable to strong electromagnetic fields, and shock frequency determines the urgency of response.

Complications after myocardial infarction include dysrhythmias, pump failure and mechanical rupture, and right ventricular infarction requires fluid rather than preload reduction.

Infarct location predicts complication: inferior infarcts affect the conduction nodes, anterior infarcts threaten pump function.

A pacemaker paces when the intrinsic rate falls below its set threshold, so a pulse below that rate indicates device failure.

Loss of coordinated atrial contraction causes stasis in the left atrial appendage and thromboembolic stroke.

Weight-indexed urine output allows renal perfusion to be compared across body sizes.

Digoxin slows conduction through the atrioventricular node and increases the force of contraction, and it has a narrow therapeutic window, so the toxic and therapeutic ranges nearly touch. It acts by inhibiting the sodium-potassium ATPase pump, and potassium competes for the same binding site — which is why hypokalemia increases its effect at any given serum concentration and hyperkalemia reduces it. This matters constantly in practice because the loop diuretics used alongside digoxin in heart failure deplete potassium. Toxicity presents in three groups: gastrointestinal, with anorexia, nausea and vomiting, which usually comes first; visual, with blurring, halos, and objects appearing yellow or green; and cardiac, with bradycardia, heart block and a range of dysrhythmias. Renal impairment and advanced age both raise the risk, since the drug is cleared renally and dosing is based on lean body mass.

S3 arises in early diastole from rapid filling of a non-compliant, overloaded ventricle and indicates decompensation in an adult with heart failure.

Heart failure is classified by the side predominantly affected, though in practice the two commonly coexist since left-sided failure is the usual cause of right-sided failure. Left-sided failure produces pulmonary congestion: dyspnea on exertion, orthopnea, paroxysmal nocturnal dyspnea, crackles, a persistent dry cough, frothy pink-tinged sputum in pulmonary edema, fatigue, and an S3 gallop. Right-sided failure produces systemic venous congestion: jugular venous distension, dependent peripheral edema, hepatomegaly and right upper quadrant discomfort, splenomegaly, ascites, anorexia and nausea from gut congestion, and weight gain. Weight gain occurs in both and is the most sensitive indicator of fluid retention, which is why daily weighing under consistent conditions is the central self-monitoring instruction, with defined thresholds for contacting the clinician. Management addresses preload, afterload and contractility with diuretics, ACE inhibitors or angiotensin receptor blockers, beta-blockers, aldosterone antagonists and, in selected clients, other agents; alongside sodium restriction, fluid restriction where prescribed, daily weights, activity pacing and vaccination.

Heart failure management outside hospital depends on the client detecting congestion early. Daily weight measured under consistent conditions is the most sensitive available monitor, since fluid accumulates before edema is visible, and it becomes actionable only when paired with specific thresholds for contacting the clinician, commonly a gain of two to three pounds in a day or five pounds in a week. Other early signs are increasing breathlessness on exertion, orthopnea, paroxysmal nocturnal dyspnea, a persistent dry cough, abdominal fullness, and reduced exercise tolerance. Teaching covers sodium restriction with attention to processed and canned foods, fluid restriction where prescribed, medication adherence with particular emphasis on not omitting diuretics or stopping beta-blockers abruptly, and daily symptom awareness. Activity is encouraged within tolerance and paced with rest periods, and supervised cardiac rehabilitation improves both symptoms and outcomes. Vaccination is recommended because respiratory infection commonly precipitates decompensation.

Extra heart sounds are classified by their position in the cardiac cycle relative to S1 and S2.

Daily weight is the earliest and most sensitive indicator of fluid retention in heart failure.

Heart failure decompensation produces left- and right-sided congestion before hemodynamic collapse.

Body weight is the most sensitive bedside measure of fluid volume change.

Loop diuretics act at the ascending limb of the loop of Henle, blocking sodium and chloride reabsorption, and they are the most powerful diuretics in routine use — which is the source of both their value and their adverse effects. Fluid and electrolytes go together, so hypokalemia, hyponatremia and hypomagnesemia are all common, and the hypokalemia matters especially when digoxin is also prescribed. Dehydration and orthostatic hypotension follow the volume loss, and the fall risk that comes with it is the practical hazard for older clients. Ototoxicity is the adverse effect most often missed: tinnitus or hearing loss, associated with high doses and rapid intravenous administration, so intravenous doses are given slowly. Daily weight is the monitoring instruction that does the most work, because a kilogram gained is about a liter of fluid and it registers before edema is visible. Timing matters for adherence — a bedtime dose means a night of nocturia, and clients stop taking drugs that keep them awake.

Delegation rests on separating a task from the judgement wrapped around it. A task may be delegated when it is routine, its outcome is predictable, and it needs no nursing judgement at the moment it is performed. A daily weight in heart failure fits: the measurement is mechanical, but its meaning is not — a two-kilogram rise over two days signals fluid retention long before crackles or edema appear, and interpreting that trend is nursing judgement the registered nurse retains. This is the general shape of delegation: the doing may transfer, the assessing, teaching, evaluating and deciding do not, and accountability for the outcome never does.

Complications after myocardial infarction include dysrhythmias, pump failure and mechanical rupture, and right ventricular infarction requires fluid rather than preload reduction.

Cardiac tamponade restricts ventricular filling, raising venous pressure while the lungs remain clear and producing pulsus paradoxus.

Failure of a ventricle produces congestion in the circulation that drains into it.

Weight is the earliest measurable sign of fluid accumulation in heart failure, changing days before dyspnea appears. One liter of retained fluid weighs about one kilogram, so a daily weight taken at the same time, on the same scale, in similar clothing detects decompensation while it is still reversible with an oral diuretic adjustment. A measurement only prevents readmission when it is attached to a specific threshold and a named person to contact — commonly a gain of about 1 kg in a day or 2 kg in a week. Education without a signal, and a signal without a route to act on it, both fail.

Prioritization ranks clients by which finding is new, physiological and deteriorating — not by which sounds most dramatic. Airway, breathing and circulation come before comfort, anxiety and routine tasks, and a change from the client's own baseline outranks an abnormal value that has been stable. New dyspnea with bibasilar crackles after a myocardial infarction signals left ventricular failure: the damaged pump cannot clear the pulmonary circulation, so fluid backs into the alveoli. Expected findings, resolved problems and small trends are documented and monitored, but they do not displace a client whose oxygenation is changing now.

Weight-indexed urine output allows renal perfusion to be compared across body sizes.

Pulse pressure reflects stroke volume and vascular compliance.

Irregular ventricular filling produces beats too weak to generate a peripheral pulse, creating a pulse deficit.

Blood pressure accuracy depends on cuff size and technique, and an unverified reading is not a basis for treatment.

Heart failure is classified by the side predominantly affected, though in practice the two commonly coexist since left-sided failure is the usual cause of right-sided failure. Left-sided failure produces pulmonary congestion: dyspnea on exertion, orthopnea, paroxysmal nocturnal dyspnea, crackles, a persistent dry cough, frothy pink-tinged sputum in pulmonary edema, fatigue, and an S3 gallop. Right-sided failure produces systemic venous congestion: jugular venous distension, dependent peripheral edema, hepatomegaly and right upper quadrant discomfort, splenomegaly, ascites, anorexia and nausea from gut congestion, and weight gain. Weight gain occurs in both and is the most sensitive indicator of fluid retention, which is why daily weighing under consistent conditions is the central self-monitoring instruction, with defined thresholds for contacting the clinician. Management addresses preload, afterload and contractility with diuretics, ACE inhibitors or angiotensin receptor blockers, beta-blockers, aldosterone antagonists and, in selected clients, other agents; alongside sodium restriction, fluid restriction where prescribed, daily weights, activity pacing and vaccination.

Daily weight is the earliest and most sensitive indicator of fluid retention in heart failure.

Compensation maintains blood pressure until late, so heart rate, respiratory rate and urine output identify a deteriorating client earlier.

Cardiac tamponade restricts ventricular filling, raising venous pressure while the lungs remain clear and producing pulsus paradoxus.

Pulse pressure is the difference between systolic and diastolic pressure and reflects stroke volume and arterial compliance. A normal adult value is approximately 30 to 40 mmHg. Widened pulse pressure arises from reduced arterial compliance, as in aging and atherosclerosis, and from conditions increasing stroke volume or causing diastolic runoff such as aortic regurgitation, thyrotoxicosis, anemia and raised intracranial pressure, where a widening pulse pressure with bradycardia forms part of Cushing's triad. Narrowed pulse pressure indicates reduced stroke volume and is seen in hypovolemia, cardiogenic shock, aortic stenosis and cardiac tamponade; it is an early warning because compensatory vasoconstriction maintains diastolic pressure while systolic falls, so the narrowing precedes overt hypotension. Mean arterial pressure is a different measure, approximated as diastolic plus one third of the pulse pressure, and reflects average perfusion pressure, with values around 65 mmHg or above generally required to perfuse organs adequately.

Urine output is one of the most useful bedside measures of perfusion, because the kidneys are early to suffer and early to recover when circulating volume changes. Roughly 30 mL per hour in an adult, or about 0.5 mL per kilogram per hour, is the usual floor for adequate renal perfusion; sustained output below that is oliguria and, in a hypovolaemic client, suggests the kidneys are no longer being adequately perfused. In severe volume depletion the body compensates first by vasoconstriction and then by drawing fluid from the extravascular compartment, which supports circulating volume while total body water keeps falling — so blood pressure can look acceptable while the deficit worsens. Isotonic crystalloids are used for resuscitation. Tachycardia that resolves with a bolus indicates the volume was the problem and it is being corrected.

The six-second counting method estimates heart rate and is valid for both regular and irregular rhythms.

Blood pressure is maintained by compensation until shock is advanced, so urine output is a more sensitive measure of restored perfusion.

Shock is classified by mechanism — volume, pump, vascular tone or obstruction — and the mechanism determines whether fluid resuscitation helps or harms.

Faulty equipment is removed from service and labeled, never worked around. Labeling matters as much as removal, because an unlabeled defective device returns to the equipment room and reaches another client. Client care is maintained by transferring the function to a working device, so continuity is never a reason to keep a hazard at the bedside. Taping damaged insulation conceals rather than repairs it, running on battery keeps a defective device in clinical use, and deferring the report leaves a live electrical hazard in place for the remainder of the shift.

Unstable angina is defined by a change in the pattern of previously stable chest pain and carries the same urgency as evolving infarction.

Digoxin slows conduction through the atrioventricular node and increases the force of contraction, and it has a narrow therapeutic window, so the toxic and therapeutic ranges nearly touch. It acts by inhibiting the sodium-potassium ATPase pump, and potassium competes for the same binding site — which is why hypokalemia increases its effect at any given serum concentration and hyperkalemia reduces it. This matters constantly in practice because the loop diuretics used alongside digoxin in heart failure deplete potassium. Toxicity presents in three groups: gastrointestinal, with anorexia, nausea and vomiting, which usually comes first; visual, with blurring, halos, and objects appearing yellow or green; and cardiac, with bradycardia, heart block and a range of dysrhythmias. Renal impairment and advanced age both raise the risk, since the drug is cleared renally and dosing is based on lean body mass.

Heart failure management outside hospital depends on the client detecting congestion early. Daily weight measured under consistent conditions is the most sensitive available monitor, since fluid accumulates before edema is visible, and it becomes actionable only when paired with specific thresholds for contacting the clinician, commonly a gain of two to three pounds in a day or five pounds in a week. Other early signs are increasing breathlessness on exertion, orthopnea, paroxysmal nocturnal dyspnea, a persistent dry cough, abdominal fullness, and reduced exercise tolerance. Teaching covers sodium restriction with attention to processed and canned foods, fluid restriction where prescribed, medication adherence with particular emphasis on not omitting diuretics or stopping beta-blockers abruptly, and daily symptom awareness. Activity is encouraged within tolerance and paced with rest periods, and supervised cardiac rehabilitation improves both symptoms and outcomes. Vaccination is recommended because respiratory infection commonly precipitates decompensation.

Body weight is the most sensitive bedside measure of fluid volume change.

Hypertensive emergency is severe hypertension with acute target-organ damage, and over-rapid correction causes hypoperfusion injury.

Cardiovascular risk assessment uses a small panel where the direction of concern differs between components. Total cholesterol is desirable below about 200 mg/dL. LDL carries cholesterol toward tissue and deposits it in arterial walls, so lower is better and treatment targets fall further for clients with established disease or diabetes. HDL transports cholesterol away from the periphery to the liver, so a high value is protective and a low one is itself a risk factor — the reference points commonly taught are roughly above 45 mg/dL for men and above 55 mg/dL for women. Triglycerides are elevated by obesity, alcohol, uncontrolled diabetes and some medications. High-sensitivity C-reactive protein reflects vascular inflammation rather than lipid burden and adds independent information, with values below about 1.0 mg/L indicating low risk and above 3.0 mg/L high risk. None of these is interpreted alone: risk is assessed alongside age, blood pressure, smoking, diabetes and family history.

Loop diuretics act at the ascending limb of the loop of Henle, blocking sodium and chloride reabsorption, and they are the most powerful diuretics in routine use — which is the source of both their value and their adverse effects. Fluid and electrolytes go together, so hypokalemia, hyponatremia and hypomagnesemia are all common, and the hypokalemia matters especially when digoxin is also prescribed. Dehydration and orthostatic hypotension follow the volume loss, and the fall risk that comes with it is the practical hazard for older clients. Ototoxicity is the adverse effect most often missed: tinnitus or hearing loss, associated with high doses and rapid intravenous administration, so intravenous doses are given slowly. Daily weight is the monitoring instruction that does the most work, because a kilogram gained is about a liter of fluid and it registers before edema is visible. Timing matters for adherence — a bedtime dose means a night of nocturia, and clients stop taking drugs that keep them awake.

Loss of coordinated atrial contraction causes stasis in the left atrial appendage and thromboembolic stroke.

Sublingual administration bypasses first-pass hepatic metabolism, and nitroglycerin loses potency on exposure to light, heat and moisture.

A refusal is documented as facts, not as a characterization of the client. The record should contain what the client said, ideally in their own words; the information given to them about the risks of refusing, which is what makes the refusal informed; and the fact that the prescriber was notified. Recording a client as 'non-adherent' substitutes a judgment for the event, inventing a clinical reason conceals the refusal, and documenting administration that did not occur is falsification. Accurate documentation of a refusal protects both the client's autonomy and the nurse.

A reported measurement is data; deciding what to do with it is a nursing judgment that follows the nurse's own assessment. Whether to withhold a prescribed antihypertensive depends on how the client looks, whether they are symptomatic, what their usual pressure is, and what the prescription specifies — none of which is contained in a single number relayed by another person. Assistants measure and report; they do not hold, give, adjust or decide. The nurse who acts on the report without seeing the client has accepted the decision without the assessment that should inform it.

Dietary management of raised LDL cholesterol focuses on the type of fat rather than the total quantity. Replacing saturated fat — in butter, lard, fatty meat, full-fat dairy and coconut and palm oils — with monounsaturated and polyunsaturated fat from olive and canola oil, nuts and seeds lowers LDL. Trans fats from partially hydrogenated oils raise LDL and lower HDL and are avoided entirely. Soluble fiber from oats, barley, legumes, psyllium and some fruits binds bile acids and modestly lowers LDL. Oily fish twice weekly supplies omega-3 fatty acids, which lower triglycerides. Plant stanols and sterols in fortified products have a small additional effect. Dietary cholesterol has a smaller influence on serum LDL than was once believed, and current emphasis rests on saturated and trans fat, though intake remains relevant for some individuals. Weight loss, physical activity and smoking cessation all improve the profile, and reducing refined carbohydrate and alcohol lowers triglycerides. Diet is combined with statin therapy where risk warrants it rather than treated as an alternative to it.

Unstable angina is defined by a change in the pattern of previously stable chest pain and carries the same urgency as evolving infarction.

Myocardial infarction presents atypically in a substantial proportion of clients, and the groups most affected are women, adults over about seventy, and people with diabetes. Instead of substernal crushing pain, the presentation may be dyspnea, unusual fatigue, nausea or vomiting, indigestion, diaphoresis, syncope, or discomfort in the jaw, neck, shoulder, back or arm. In diabetes, autonomic neuropathy attenuates the sensation of ischemic pain, so silent infarction is common and may be discovered only on a later electrocardiogram. The clinical consequence is delay: atypical presentations are less likely to prompt emergency activation by the client, less likely to be triaged urgently, and more likely to be attributed to gastrointestinal or psychological causes — and time to reperfusion determines the amount of myocardium salvaged. Assessment of any client at cardiovascular risk with new fatigue, dyspnea or nausea therefore includes a twelve-lead electrocardiogram and troponin rather than a symptomatic diagnosis. Troponin is the specific marker, rising within a few hours and remaining elevated for days.

Cardiac troponin is specific to myocardial injury but rises over hours, so serial sampling is required and treatment decisions rest on the electrocardiogram.

Acute chest pain management is time-driven, with the 12-lead ECG as the branch point for all subsequent treatment.

HDL removes cholesterol from vessel walls, so low HDL is an independent cardiovascular risk factor.

Complications after myocardial infarction include dysrhythmias, pump failure and mechanical rupture, and right ventricular infarction requires fluid rather than preload reduction.

Post-infarct teaching is sequenced by the consequence of omitting each item.

Infarct location predicts complication: inferior infarcts affect the conduction nodes, anterior infarcts threaten pump function.

Myocardial infarction occurs when coronary blood flow is interrupted, usually by rupture of an atherosclerotic plaque with thrombus formation, and myocardium begins to die within a short time. Classic presentation is substernal chest discomfort described as pressure, tightness, squeezing or heaviness, possibly radiating to the jaw, neck, back or left arm, with diaphoresis, nausea, shortness of breath and a sense of doom. Atypical presentation is common in women, older adults and clients with diabetes, where autonomic neuropathy may blunt pain — fatigue, indigestion, dyspnea or syncope may be the only features, and silent infarction occurs. Public teaching emphasizes calling emergency services immediately rather than self-transporting, because defibrillation and treatment begin in the ambulance and out-of-hospital cardiac arrest is common in the first hour. In hospital, management centers on rapid reperfusion, with time from first medical contact to intervention the measure that tracks outcome, alongside aspirin, antiplatelet therapy, anticoagulation, nitrates, oxygen where hypoxic, and morphine for pain not relieved by nitrates.

Cardiac catheterization punctures an artery, so bleeding, distal ischemia and contrast nephrotoxicity are the three risks the nursing care addresses.

Shock is classified by mechanism — volume, pump, vascular tone or obstruction — and the mechanism determines whether fluid resuscitation helps or harms.

Prioritization ranks clients by which finding is new, physiological and deteriorating — not by which sounds most dramatic. Airway, breathing and circulation come before comfort, anxiety and routine tasks, and a change from the client's own baseline outranks an abnormal value that has been stable. New dyspnea with bibasilar crackles after a myocardial infarction signals left ventricular failure: the damaged pump cannot clear the pulmonary circulation, so fluid backs into the alveoli. Expected findings, resolved problems and small trends are documented and monitored, but they do not displace a client whose oxygenation is changing now.

Graduated compression stockings promote venous return by applying greater pressure distally than proximally, reducing venous stasis and the risk of deep vein thrombosis in immobile and postoperative clients. Correct fit is essential, since a stocking that is too tight, rolled down, or bunched behind the knee becomes a tourniquet and produces the problem it was meant to prevent. Contraindications include severe peripheral arterial disease, where compression compromises an already reduced arterial supply; local skin conditions including dermatitis, open wounds, ulceration, cellulitis and necrosis; marked limb deformity preventing proper fit; and decompensated heart failure with pulmonary edema, where increasing venous return adds to the load. Massive leg edema and recent skin grafting are also excluded. Nursing care includes measuring rather than estimating size, applying before the client rises when venous volume is lowest, removing them at intervals to inspect the skin and assess circulation, and checking that they have not rolled. Mechanical compression is used alongside, not instead of, mobilization and pharmacological prophylaxis where indicated.

Antiembolic stockings rely on a graduated pressure gradient that rolling or bunching destroys.

An intact abdominal aortic aneurysm presents as a pulsating mass with a bruit, while rupture produces sudden severe pain with hemorrhagic shock.

Arterial insufficiency limits blood supply and worsens with elevation, while venous insufficiency impairs drainage and improves with elevation.

Arterial insufficiency causes exertional claudication relieved by dependency; venous insufficiency causes a constant ache relieved by elevation.

Deep vein thrombosis arises from the combination of venous stasis, endothelial injury and hypercoagulability, all of which are present after surgery. It presents with unilateral calf or thigh pain, swelling, warmth, erythema and tenderness, though it may be entirely asymptomatic, and the first indication is sometimes pulmonary embolism. Diagnosis rests on ultrasound with D-dimer used to exclude in low-probability cases. Homans sign, calf pain on dorsiflexion, is unreliable and is no longer recommended, both because it misses many thromboses and because eliciting it manipulates the limb. Management is anticoagulation, initially with a rapid-acting agent, alongside limb elevation and analgesia; the limb is not massaged. Prevention is the larger part of the topic and includes early mobilization, mechanical compression devices, pharmacological prophylaxis, adequate hydration and avoidance of prolonged pressure behind the knee. Client teaching after discharge on anticoagulants covers bleeding precautions, monitoring requirements, and the signs of pulmonary embolism that require emergency care.

Phlebitis is inflammation of the vein wall caused by the catheter, so removal precedes all other management.

Peripheral arterial disease results from atherosclerotic narrowing that limits inflow, while chronic venous insufficiency results from valve incompetence that impairs outflow, and their assessment findings diverge accordingly. Arterial disease presents with intermittent claudication — reproducible exertional pain relieved by rest — progressing to rest pain, characteristically at night and eased by dangling the leg. The limb is cool and pale, with diminished or absent pulses, prolonged capillary refill, thin shiny hairless skin, thickened nails, and pallor on elevation with dependent rubor. Ulcers occur distally on toes, heels and lateral malleolus, are punched-out with well-defined edges, and are painful. The ankle-brachial index quantifies severity. Venous insufficiency presents with aching heaviness relieved by elevation, edema, warmth, hemosiderin staining and lipodermatosclerosis around the ankle, and ulcers over the medial malleolus with irregular edges and heavy exudate. Management diverges sharply: venous disease is treated with compression and elevation, both of which are harmful in significant arterial disease, so the ankle-brachial index is checked before compression is applied to any leg ulcer.

Cardiac catheterization passes a catheter through an artery, commonly femoral or radial, into the coronary circulation for diagnosis or intervention. The main nursing concern afterwards is the access site. With a femoral approach the affected extremity is kept straight, the client remains supine with limited head elevation, and movement is restricted for a period determined by the closure method and whether anticoagulation was given. The site is assessed for bleeding, swelling and hematoma, with attention to blood tracking beneath the client where it is not visible, and distal circulation is checked by pulse, color, temperature, capillary refill and sensation. Complications include bleeding and hematoma, retroperitoneal hemorrhage presenting as back or flank pain with hypotension, arterial thrombosis or dissection, pseudoaneurysm, dysrhythmia, contrast-induced nephropathy, and contrast allergy. Fluids are encouraged after the procedure to clear contrast, and clients on metformin have it withheld around the procedure because of the renal risk. A radial approach allows earlier mobilization and carries lower bleeding risk.

Cardiac catheterization punctures an artery, so bleeding, distal ischemia and contrast nephrotoxicity are the three risks the nursing care addresses.

Neurovascular assessment is performed distal to any cast or injury, because that is the tissue whose perfusion is threatened.

Femoral arterial access risks local and retroperitoneal hemorrhage with distal limb ischemia.

An intact abdominal aortic aneurysm presents as a pulsating mass with a bruit, while rupture produces sudden severe pain with hemorrhagic shock.

Blood pressure accuracy depends on cuff size and technique, and an unverified reading is not a basis for treatment.

Hypertensive emergency is severe hypertension with acute target-organ damage, and over-rapid correction causes hypoperfusion injury.

Chronic hypertension resets cerebral autoregulation, so over-rapid correction produces ischemia.

HDL removes cholesterol from vessel walls, so low HDL is an independent cardiovascular risk factor.

Cardiovascular risk assessment uses a small panel where the direction of concern differs between components. Total cholesterol is desirable below about 200 mg/dL. LDL carries cholesterol toward tissue and deposits it in arterial walls, so lower is better and treatment targets fall further for clients with established disease or diabetes. HDL transports cholesterol away from the periphery to the liver, so a high value is protective and a low one is itself a risk factor — the reference points commonly taught are roughly above 45 mg/dL for men and above 55 mg/dL for women. Triglycerides are elevated by obesity, alcohol, uncontrolled diabetes and some medications. High-sensitivity C-reactive protein reflects vascular inflammation rather than lipid burden and adds independent information, with values below about 1.0 mg/L indicating low risk and above 3.0 mg/L high risk. None of these is interpreted alone: risk is assessed alongside age, blood pressure, smoking, diabetes and family history.

Pulse pressure is the difference between systolic and diastolic pressure and reflects stroke volume and arterial compliance. A normal adult value is approximately 30 to 40 mmHg. Widened pulse pressure arises from reduced arterial compliance, as in aging and atherosclerosis, and from conditions increasing stroke volume or causing diastolic runoff such as aortic regurgitation, thyrotoxicosis, anemia and raised intracranial pressure, where a widening pulse pressure with bradycardia forms part of Cushing's triad. Narrowed pulse pressure indicates reduced stroke volume and is seen in hypovolemia, cardiogenic shock, aortic stenosis and cardiac tamponade; it is an early warning because compensatory vasoconstriction maintains diastolic pressure while systolic falls, so the narrowing precedes overt hypotension. Mean arterial pressure is a different measure, approximated as diastolic plus one third of the pulse pressure, and reflects average perfusion pressure, with values around 65 mmHg or above generally required to perfuse organs adequately.

S4 reflects atrial contraction against reduced ventricular compliance.

A reported measurement is data; deciding what to do with it is a nursing judgment that follows the nurse's own assessment. Whether to withhold a prescribed antihypertensive depends on how the client looks, whether they are symptomatic, what their usual pressure is, and what the prescription specifies — none of which is contained in a single number relayed by another person. Assistants measure and report; they do not hold, give, adjust or decide. The nurse who acts on the report without seeing the client has accepted the decision without the assessment that should inform it.

Dietary management of raised LDL cholesterol focuses on the type of fat rather than the total quantity. Replacing saturated fat — in butter, lard, fatty meat, full-fat dairy and coconut and palm oils — with monounsaturated and polyunsaturated fat from olive and canola oil, nuts and seeds lowers LDL. Trans fats from partially hydrogenated oils raise LDL and lower HDL and are avoided entirely. Soluble fiber from oats, barley, legumes, psyllium and some fruits binds bile acids and modestly lowers LDL. Oily fish twice weekly supplies omega-3 fatty acids, which lower triglycerides. Plant stanols and sterols in fortified products have a small additional effect. Dietary cholesterol has a smaller influence on serum LDL than was once believed, and current emphasis rests on saturated and trans fat, though intake remains relevant for some individuals. Weight loss, physical activity and smoking cessation all improve the profile, and reducing refined carbohydrate and alcohol lowers triglycerides. Diet is combined with statin therapy where risk warrants it rather than treated as an alternative to it.

In atrial fibrillation the atria do not contract, causing blood stasis with embolic risk and loss of the atrial contribution to ventricular filling.

Bundle branch block delays intraventricular conduction, widening the QRS without affecting the PR interval.

Synchronization avoids the vulnerable repolarization period, and pre-cardioversion anticoagulation prevents embolic stroke.

Ventricular fibrillation is disorganized electrical activity in which the ventricles quiver rather than contract, so there is no cardiac output and no pulse. It is the commonest initial rhythm in adult cardiac arrest and it is fatal within minutes untreated. The distinction from synchronized cardioversion is worth holding clearly because it is a single condition: cardioversion times the shock to the R wave, avoiding the relative refractory period of the T wave where a shock can itself induce fibrillation, and it is used for organized but unstable tachyarrhythmias — unstable atrial fibrillation or flutter, and ventricular tachycardia with a pulse. Defibrillation is unsynchronized and is used where there is no organized rhythm to time to: ventricular fibrillation, and pulseless ventricular tachycardia. The other rule that follows from this: asystole and pulseless electrical activity are not shockable at all, because there is no fibrillation to terminate.

Potassium and calcium abnormalities produce characteristic electrocardiographic changes that often precede laboratory confirmation.

Ambulatory electrocardiographic monitoring records cardiac rhythm continuously during ordinary activity, most commonly over 24 to 48 hours, to capture intermittent arrhythmia that a resting electrocardiogram will not show. Its value depends on two things: the recording being continuous, and a record of what the client was doing when any abnormality occurred. Client teaching therefore covers maintaining usual daily activity including work and exercise as tolerated, keeping a diary of activities, symptoms such as palpitations, dizziness, chest discomfort or breathlessness, and the exact times of each, and pressing the event marker where the device has one while continuing the activity. The equipment is kept dry, so bathing, showering and swimming are avoided, and electrodes are not removed or repositioned by the client. Sources of electromagnetic interference including electric blankets, magnets, metal detectors and some electrical equipment are avoided. Skin irritation under electrodes is reported rather than self-managed. Longer-term options include event recorders activated by the client, patch monitors worn for up to two weeks, and implantable loop recorders where episodes are infrequent.

Loss of coordinated atrial contraction causes stasis in the left atrial appendage and thromboembolic stroke.

The six-second counting method estimates heart rate and is valid for both regular and irregular rhythms.

An intact abdominal aortic aneurysm presents as a pulsating mass with a bruit, while rupture produces sudden severe pain with hemorrhagic shock.

Cardiopulmonary bypass produces bleeding, electrolyte-driven dysrhythmias and embolic risk, and a chest tube that stops draining may indicate tamponade.

Hypertensive emergency is severe hypertension with acute target-organ damage, and over-rapid correction causes hypoperfusion injury.

Compensation maintains blood pressure until late, so heart rate, respiratory rate and urine output identify a deteriorating client earlier.

Cardiac tamponade restricts ventricular filling, raising venous pressure while the lungs remain clear and producing pulsus paradoxus.

Pulse pressure is the difference between systolic and diastolic pressure and reflects stroke volume and arterial compliance. A normal adult value is approximately 30 to 40 mmHg. Widened pulse pressure arises from reduced arterial compliance, as in aging and atherosclerosis, and from conditions increasing stroke volume or causing diastolic runoff such as aortic regurgitation, thyrotoxicosis, anemia and raised intracranial pressure, where a widening pulse pressure with bradycardia forms part of Cushing's triad. Narrowed pulse pressure indicates reduced stroke volume and is seen in hypovolemia, cardiogenic shock, aortic stenosis and cardiac tamponade; it is an early warning because compensatory vasoconstriction maintains diastolic pressure while systolic falls, so the narrowing precedes overt hypotension. Mean arterial pressure is a different measure, approximated as diastolic plus one third of the pulse pressure, and reflects average perfusion pressure, with values around 65 mmHg or above generally required to perfuse organs adequately.

Urine output is one of the most useful bedside measures of perfusion, because the kidneys are early to suffer and early to recover when circulating volume changes. Roughly 30 mL per hour in an adult, or about 0.5 mL per kilogram per hour, is the usual floor for adequate renal perfusion; sustained output below that is oliguria and, in a hypovolaemic client, suggests the kidneys are no longer being adequately perfused. In severe volume depletion the body compensates first by vasoconstriction and then by drawing fluid from the extravascular compartment, which supports circulating volume while total body water keeps falling — so blood pressure can look acceptable while the deficit worsens. Isotonic crystalloids are used for resuscitation. Tachycardia that resolves with a bolus indicates the volume was the problem and it is being corrected.

Blood pressure is maintained by compensation until shock is advanced, so urine output is a more sensitive measure of restored perfusion.

Shock is classified by mechanism — volume, pump, vascular tone or obstruction — and the mechanism determines whether fluid resuscitation helps or harms.

Cardiopulmonary bypass produces bleeding, electrolyte-driven dysrhythmias and embolic risk, and a chest tube that stops draining may indicate tamponade.

A pacemaker paces when the intrinsic rate falls below its set threshold, so a pulse below that rate indicates device failure.

Cardiac catheterization passes a catheter through an artery, commonly femoral or radial, into the coronary circulation for diagnosis or intervention. The main nursing concern afterwards is the access site. With a femoral approach the affected extremity is kept straight, the client remains supine with limited head elevation, and movement is restricted for a period determined by the closure method and whether anticoagulation was given. The site is assessed for bleeding, swelling and hematoma, with attention to blood tracking beneath the client where it is not visible, and distal circulation is checked by pulse, color, temperature, capillary refill and sensation. Complications include bleeding and hematoma, retroperitoneal hemorrhage presenting as back or flank pain with hypotension, arterial thrombosis or dissection, pseudoaneurysm, dysrhythmia, contrast-induced nephropathy, and contrast allergy. Fluids are encouraged after the procedure to clear contrast, and clients on metformin have it withheld around the procedure because of the renal risk. A radial approach allows earlier mobilization and carries lower bleeding risk.

Cardiac catheterization punctures an artery, so bleeding, distal ischemia and contrast nephrotoxicity are the three risks the nursing care addresses.

Prosthetic heart valves carry lifelong risks of thrombosis and infective endocarditis, which determine anticoagulation and prophylaxis requirements.

Sternal healing after median sternotomy governs activity restriction, and sternal instability is a surgical emergency.

Femoral arterial access risks local and retroperitoneal hemorrhage with distal limb ischemia.

Implantable defibrillators are vulnerable to strong electromagnetic fields, and shock frequency determines the urgency of response.

Post-infarct teaching is sequenced by the consequence of omitting each item.

A pacemaker paces when the intrinsic rate falls below its set threshold, so a pulse below that rate indicates device failure.

Sublingual administration bypasses first-pass hepatic metabolism, and nitroglycerin loses potency on exposure to light, heat and moisture.

Prosthetic heart valves carry lifelong risks of thrombosis and infective endocarditis, which determine anticoagulation and prophylaxis requirements.

Sternal healing after median sternotomy governs activity restriction, and sternal instability is a surgical emergency.

Weight is the earliest measurable sign of fluid accumulation in heart failure, changing days before dyspnea appears. One liter of retained fluid weighs about one kilogram, so a daily weight taken at the same time, on the same scale, in similar clothing detects decompensation while it is still reversible with an oral diuretic adjustment. A measurement only prevents readmission when it is attached to a specific threshold and a named person to contact — commonly a gain of about 1 kg in a day or 2 kg in a week. Education without a signal, and a signal without a route to act on it, both fail.

Unstable angina is defined by a change in the pattern of previously stable chest pain and carries the same urgency as evolving infarction.

Myocardial infarction presents atypically in a substantial proportion of clients, and the groups most affected are women, adults over about seventy, and people with diabetes. Instead of substernal crushing pain, the presentation may be dyspnea, unusual fatigue, nausea or vomiting, indigestion, diaphoresis, syncope, or discomfort in the jaw, neck, shoulder, back or arm. In diabetes, autonomic neuropathy attenuates the sensation of ischemic pain, so silent infarction is common and may be discovered only on a later electrocardiogram. The clinical consequence is delay: atypical presentations are less likely to prompt emergency activation by the client, less likely to be triaged urgently, and more likely to be attributed to gastrointestinal or psychological causes — and time to reperfusion determines the amount of myocardium salvaged. Assessment of any client at cardiovascular risk with new fatigue, dyspnea or nausea therefore includes a twelve-lead electrocardiogram and troponin rather than a symptomatic diagnosis. Troponin is the specific marker, rising within a few hours and remaining elevated for days.

Cardiac troponin is specific to myocardial injury but rises over hours, so serial sampling is required and treatment decisions rest on the electrocardiogram.

Acute chest pain management is time-driven, with the 12-lead ECG as the branch point for all subsequent treatment.

Myocardial infarction occurs when coronary blood flow is interrupted, usually by rupture of an atherosclerotic plaque with thrombus formation, and myocardium begins to die within a short time. Classic presentation is substernal chest discomfort described as pressure, tightness, squeezing or heaviness, possibly radiating to the jaw, neck, back or left arm, with diaphoresis, nausea, shortness of breath and a sense of doom. Atypical presentation is common in women, older adults and clients with diabetes, where autonomic neuropathy may blunt pain — fatigue, indigestion, dyspnea or syncope may be the only features, and silent infarction occurs. Public teaching emphasizes calling emergency services immediately rather than self-transporting, because defibrillation and treatment begin in the ambulance and out-of-hospital cardiac arrest is common in the first hour. In hospital, management centers on rapid reperfusion, with time from first medical contact to intervention the measure that tracks outcome, alongside aspirin, antiplatelet therapy, anticoagulation, nitrates, oxygen where hypoxic, and morphine for pain not relieved by nitrates.

Sublingual administration bypasses first-pass hepatic metabolism, and nitroglycerin loses potency on exposure to light, heat and moisture.

Graduated compression stockings promote venous return by applying greater pressure distally than proximally, reducing venous stasis and the risk of deep vein thrombosis in immobile and postoperative clients. Correct fit is essential, since a stocking that is too tight, rolled down, or bunched behind the knee becomes a tourniquet and produces the problem it was meant to prevent. Contraindications include severe peripheral arterial disease, where compression compromises an already reduced arterial supply; local skin conditions including dermatitis, open wounds, ulceration, cellulitis and necrosis; marked limb deformity preventing proper fit; and decompensated heart failure with pulmonary edema, where increasing venous return adds to the load. Massive leg edema and recent skin grafting are also excluded. Nursing care includes measuring rather than estimating size, applying before the client rises when venous volume is lowest, removing them at intervals to inspect the skin and assess circulation, and checking that they have not rolled. Mechanical compression is used alongside, not instead of, mobilization and pharmacological prophylaxis where indicated.

Antiembolic stockings rely on a graduated pressure gradient that rolling or bunching destroys.

Arterial insufficiency limits blood supply and worsens with elevation, while venous insufficiency impairs drainage and improves with elevation.

Deep vein thrombosis arises from the combination of venous stasis, endothelial injury and hypercoagulability, all of which are present after surgery. It presents with unilateral calf or thigh pain, swelling, warmth, erythema and tenderness, though it may be entirely asymptomatic, and the first indication is sometimes pulmonary embolism. Diagnosis rests on ultrasound with D-dimer used to exclude in low-probability cases. Homans sign, calf pain on dorsiflexion, is unreliable and is no longer recommended, both because it misses many thromboses and because eliciting it manipulates the limb. Management is anticoagulation, initially with a rapid-acting agent, alongside limb elevation and analgesia; the limb is not massaged. Prevention is the larger part of the topic and includes early mobilization, mechanical compression devices, pharmacological prophylaxis, adequate hydration and avoidance of prolonged pressure behind the knee. Client teaching after discharge on anticoagulants covers bleeding precautions, monitoring requirements, and the signs of pulmonary embolism that require emergency care.

Peripheral arterial disease results from atherosclerotic narrowing that limits inflow, while chronic venous insufficiency results from valve incompetence that impairs outflow, and their assessment findings diverge accordingly. Arterial disease presents with intermittent claudication — reproducible exertional pain relieved by rest — progressing to rest pain, characteristically at night and eased by dangling the leg. The limb is cool and pale, with diminished or absent pulses, prolonged capillary refill, thin shiny hairless skin, thickened nails, and pallor on elevation with dependent rubor. Ulcers occur distally on toes, heels and lateral malleolus, are punched-out with well-defined edges, and are painful. The ankle-brachial index quantifies severity. Venous insufficiency presents with aching heaviness relieved by elevation, edema, warmth, hemosiderin staining and lipodermatosclerosis around the ankle, and ulcers over the medial malleolus with irregular edges and heavy exudate. Management diverges sharply: venous disease is treated with compression and elevation, both of which are harmful in significant arterial disease, so the ankle-brachial index is checked before compression is applied to any leg ulcer.

Venous thromboembolism after lower-limb surgery can embolize to the lung, and any manipulation of the affected limb risks dislodging further clot.

Cardiac auscultation uses five standard sites, positioned where sound from each valve is transmitted best rather than directly over the valve itself. The aortic area is the second intercostal space at the right sternal border, and the pulmonic area the second intercostal space at the left sternal border; together these form the base of the heart. Erb's point, at the third intercostal space on the left sternal border, is where both S1 and S2 are heard well. The tricuspid area is at the fourth or fifth intercostal space at the left sternal border, and the mitral or apical area at the fifth intercostal space in the midclavicular line, where S1 is loudest and where the apical impulse is normally felt. S1 marks closure of the mitral and tricuspid valves at the start of systole, and S2 closure of the aortic and pulmonic valves. Murmurs are described by timing, location, radiation, intensity and quality, and are auscultated with both diaphragm, for higher-pitched sounds, and bell, for lower-pitched sounds such as S3 and S4. An apical pulse is counted at the mitral area for a full minute, and is the required assessment before administering digoxin.

S3 arises in early diastole from rapid filling of a non-compliant, overloaded ventricle and indicates decompensation in an adult with heart failure.

Extra heart sounds are classified by their position in the cardiac cycle relative to S1 and S2.

Neurovascular assessment is performed distal to any cast or injury, because that is the tissue whose perfusion is threatened.

S4 reflects atrial contraction against reduced ventricular compliance.

In atrial fibrillation the atria do not contract, causing blood stasis with embolic risk and loss of the atrial contribution to ventricular filling.

Elective cardioversion requires prior anticoagulation and sedation-standard fasting.

Prosthetic heart valves carry lifelong risks of thrombosis and infective endocarditis, which determine anticoagulation and prophylaxis requirements.

Digoxin slows conduction through the atrioventricular node and increases the force of contraction, and it has a narrow therapeutic window, so the toxic and therapeutic ranges nearly touch. It acts by inhibiting the sodium-potassium ATPase pump, and potassium competes for the same binding site — which is why hypokalemia increases its effect at any given serum concentration and hyperkalemia reduces it. This matters constantly in practice because the loop diuretics used alongside digoxin in heart failure deplete potassium. Toxicity presents in three groups: gastrointestinal, with anorexia, nausea and vomiting, which usually comes first; visual, with blurring, halos, and objects appearing yellow or green; and cardiac, with bradycardia, heart block and a range of dysrhythmias. Renal impairment and advanced age both raise the risk, since the drug is cleared renally and dosing is based on lean body mass.

Potassium and calcium abnormalities produce characteristic electrocardiographic changes that often precede laboratory confirmation.

Delegation rests on separating a task from the judgement wrapped around it. A task may be delegated when it is routine, its outcome is predictable, and it needs no nursing judgement at the moment it is performed. A daily weight in heart failure fits: the measurement is mechanical, but its meaning is not — a two-kilogram rise over two days signals fluid retention long before crackles or edema appear, and interpreting that trend is nursing judgement the registered nurse retains. This is the general shape of delegation: the doing may transfer, the assessing, teaching, evaluating and deciding do not, and accountability for the outcome never does.

A reported measurement is data; deciding what to do with it is a nursing judgment that follows the nurse's own assessment. Whether to withhold a prescribed antihypertensive depends on how the client looks, whether they are symptomatic, what their usual pressure is, and what the prescription specifies — none of which is contained in a single number relayed by another person. Assistants measure and report; they do not hold, give, adjust or decide. The nurse who acts on the report without seeing the client has accepted the decision without the assessment that should inform it.

Weight is the earliest measurable sign of fluid accumulation in heart failure, changing days before dyspnea appears. One liter of retained fluid weighs about one kilogram, so a daily weight taken at the same time, on the same scale, in similar clothing detects decompensation while it is still reversible with an oral diuretic adjustment. A measurement only prevents readmission when it is attached to a specific threshold and a named person to contact — commonly a gain of about 1 kg in a day or 2 kg in a week. Education without a signal, and a signal without a route to act on it, both fail.

Delegation rests on separating a task from the judgement wrapped around it. A task may be delegated when it is routine, its outcome is predictable, and it needs no nursing judgement at the moment it is performed. A daily weight in heart failure fits: the measurement is mechanical, but its meaning is not — a two-kilogram rise over two days signals fluid retention long before crackles or edema appear, and interpreting that trend is nursing judgement the registered nurse retains. This is the general shape of delegation: the doing may transfer, the assessing, teaching, evaluating and deciding do not, and accountability for the outcome never does.

A refusal is documented as facts, not as a characterization of the client. The record should contain what the client said, ideally in their own words; the information given to them about the risks of refusing, which is what makes the refusal informed; and the fact that the prescriber was notified. Recording a client as 'non-adherent' substitutes a judgment for the event, inventing a clinical reason conceals the refusal, and documenting administration that did not occur is falsification. Accurate documentation of a refusal protects both the client's autonomy and the nurse.

Faulty equipment is removed from service and labeled, never worked around. Labeling matters as much as removal, because an unlabeled defective device returns to the equipment room and reaches another client. Client care is maintained by transferring the function to a working device, so continuity is never a reason to keep a hazard at the bedside. Taping damaged insulation conceals rather than repairs it, running on battery keeps a defective device in clinical use, and deferring the report leaves a live electrical hazard in place for the remainder of the shift.

Faulty equipment is removed from service and labeled, never worked around. Labeling matters as much as removal, because an unlabeled defective device returns to the equipment room and reaches another client. Client care is maintained by transferring the function to a working device, so continuity is never a reason to keep a hazard at the bedside. Taping damaged insulation conceals rather than repairs it, running on battery keeps a defective device in clinical use, and deferring the report leaves a live electrical hazard in place for the remainder of the shift.

Urine output is one of the most useful bedside measures of perfusion, because the kidneys are early to suffer and early to recover when circulating volume changes. Roughly 30 mL per hour in an adult, or about 0.5 mL per kilogram per hour, is the usual floor for adequate renal perfusion; sustained output below that is oliguria and, in a hypovolaemic client, suggests the kidneys are no longer being adequately perfused. In severe volume depletion the body compensates first by vasoconstriction and then by drawing fluid from the extravascular compartment, which supports circulating volume while total body water keeps falling — so blood pressure can look acceptable while the deficit worsens. Isotonic crystalloids are used for resuscitation. Tachycardia that resolves with a bolus indicates the volume was the problem and it is being corrected.

Loop diuretics act at the ascending limb of the loop of Henle, blocking sodium and chloride reabsorption, and they are the most powerful diuretics in routine use — which is the source of both their value and their adverse effects. Fluid and electrolytes go together, so hypokalemia, hyponatremia and hypomagnesemia are all common, and the hypokalemia matters especially when digoxin is also prescribed. Dehydration and orthostatic hypotension follow the volume loss, and the fall risk that comes with it is the practical hazard for older clients. Ototoxicity is the adverse effect most often missed: tinnitus or hearing loss, associated with high doses and rapid intravenous administration, so intravenous doses are given slowly. Daily weight is the monitoring instruction that does the most work, because a kilogram gained is about a liter of fluid and it registers before edema is visible. Timing matters for adherence — a bedtime dose means a night of nocturia, and clients stop taking drugs that keep them awake.

Potassium and calcium abnormalities produce characteristic electrocardiographic changes that often precede laboratory confirmation.

Venous thromboembolism after lower-limb surgery can embolize to the lung, and any manipulation of the affected limb risks dislodging further clot.

A refusal is documented as facts, not as a characterization of the client. The record should contain what the client said, ideally in their own words; the information given to them about the risks of refusing, which is what makes the refusal informed; and the fact that the prescriber was notified. Recording a client as 'non-adherent' substitutes a judgment for the event, inventing a clinical reason conceals the refusal, and documenting administration that did not occur is falsification. Accurate documentation of a refusal protects both the client's autonomy and the nurse.

Dietary management of raised LDL cholesterol focuses on the type of fat rather than the total quantity. Replacing saturated fat — in butter, lard, fatty meat, full-fat dairy and coconut and palm oils — with monounsaturated and polyunsaturated fat from olive and canola oil, nuts and seeds lowers LDL. Trans fats from partially hydrogenated oils raise LDL and lower HDL and are avoided entirely. Soluble fiber from oats, barley, legumes, psyllium and some fruits binds bile acids and modestly lowers LDL. Oily fish twice weekly supplies omega-3 fatty acids, which lower triglycerides. Plant stanols and sterols in fortified products have a small additional effect. Dietary cholesterol has a smaller influence on serum LDL than was once believed, and current emphasis rests on saturated and trans fat, though intake remains relevant for some individuals. Weight loss, physical activity and smoking cessation all improve the profile, and reducing refined carbohydrate and alcohol lowers triglycerides. Diet is combined with statin therapy where risk warrants it rather than treated as an alternative to it.

Compensation maintains blood pressure until late, so heart rate, respiratory rate and urine output identify a deteriorating client earlier.

Prioritization ranks clients by which finding is new, physiological and deteriorating — not by which sounds most dramatic. Airway, breathing and circulation come before comfort, anxiety and routine tasks, and a change from the client's own baseline outranks an abnormal value that has been stable. New dyspnea with bibasilar crackles after a myocardial infarction signals left ventricular failure: the damaged pump cannot clear the pulmonary circulation, so fluid backs into the alveoli. Expected findings, resolved problems and small trends are documented and monitored, but they do not displace a client whose oxygenation is changing now.

Venous thromboembolism after lower-limb surgery can embolize to the lung, and any manipulation of the affected limb risks dislodging further clot.