UPNURSING NOTES | NORCET 12 PREPARATION
Cardiomyopathy
Complete Nursing Notes + Clinical Case-Based MCQ Test
Medical-Surgical Nursing | Cardiovascular Disorders
High-Yield Revision Clinical Scenarios 25 MCQs 30-Minute Timer
Learning objectives
- Define cardiomyopathy and classify its major types.
- Differentiate dilated, hypertrophic, restrictive and arrhythmogenic cardiomyopathy.
- Recognize clinical manifestations, diagnostic findings and complications.
- Prioritize nursing interventions in acute deterioration.
- Practice case-based questions relevant to Nursing Officer examinations.
Table of Contents
1. Definition and Classification
2. Normal Heart vs Cardiomyopathy
3. Causes and Risk Factors
4. Types of Cardiomyopathy
5. Clinical Manifestations
6. Diagnostic Investigations
7. Medical and Surgical Management
8. Nursing Management and Priorities
9. Complications and Emergency Care
10. Comparison Table
11. Mnemonics and Exam Pearls
12. 30-Minute MCQ Test — 25 Questions
1. Definition and Classification
Cardiomyopathy refers to a disorder of the heart muscle associated with structural and/or functional abnormalities that may impair ventricular filling, contraction or electrical stability. It may lead to heart failure, arrhythmias and sudden cardiac death.
Exam focus: Cardiomyopathy is a disease of the myocardium. Coronary artery disease, hypertension and valvular disease may coexist with myocardial disease, but they should not automatically be assumed to be the primary cause of every cardiomyopathy phenotype.
Major classifications
| Type | Primary abnormality | Key feature |
|---|---|---|
| Dilated cardiomyopathy (DCM) | Ventricular dilation with systolic dysfunction | Reduced ejection fraction |
| Hypertrophic cardiomyopathy (HCM) | Abnormal myocardial hypertrophy | Impaired relaxation; possible LV outflow obstruction |
| Restrictive cardiomyopathy (RCM) | Increased ventricular stiffness | Impaired filling with relatively preserved EF early in disease |
| Arrhythmogenic cardiomyopathy (ACM) | Myocardial disease with ventricular arrhythmia tendency | Often associated with inherited desmosomal abnormalities |
| Takotsubo syndrome | Transient regional ventricular dysfunction | May follow intense emotional or physical stress |
| Peripartum cardiomyopathy | Heart failure with LV systolic dysfunction around pregnancy or postpartum | Requires urgent assessment and follow-up |
Note: Peripartum cardiomyopathy and Takotsubo syndrome are clinically important specific presentations. Classification systems vary, and these conditions should not be treated as identical to the major inherited cardiomyopathy phenotypes.
2. Normal Heart vs Cardiomyopathy
Normal myocardium
↓
Effective filling + contraction
↓
Adequate cardiac output
Abnormal myocardium
↓
Impaired contraction / filling / rhythm
↓
Heart failure / arrhythmia risk
The left ventricle normally pumps oxygenated blood into the systemic circulation. Cardiomyopathy can affect its ability to eject blood, relax during diastole, or maintain a stable rhythm. Some forms primarily affect the right ventricle or both ventricles.
3. Causes and Risk Factors
A. Genetic factors
- Inherited sarcomeric protein abnormalities in many cases of HCM.
- Genetic variants associated with DCM, including some cytoskeletal, nuclear-envelope and sarcomeric proteins.
- Desmosomal gene abnormalities associated with many cases of arrhythmogenic cardiomyopathy.
- Family history of unexplained sudden cardiac death, cardiomyopathy or premature serious arrhythmia.
B. Acquired causes
- Myocarditis, including viral-associated myocardial injury.
- Alcohol-related myocardial damage and exposure to certain cardiotoxic drugs, including some chemotherapy agents.
- Persistent tachyarrhythmias causing or worsening ventricular dysfunction.
- Infiltrative disorders such as amyloidosis and some storage diseases.
- Endocrine or metabolic disorders, including thyroid disorders and iron overload.
- Pregnancy-associated cardiomyopathy in susceptible individuals.
- Some nutritional deficiencies, toxins and systemic diseases.
Remember: “G-A-M-E”
- G — Genetic causes
- A — Alcohol and acquired myocardial injury
- M — Metabolic and myocarditis-related causes
- E — Endocrine, environmental and exposure-related causes
4. Types of Cardiomyopathy
A. Dilated Cardiomyopathy (DCM)
DCM is characterized by dilation of one or both ventricles and impaired systolic contraction that is not explained solely by abnormal loading conditions or coronary artery disease.
Pathophysiology
Ventricular dilation
→
Reduced contractility
→
Reduced stroke volume / EF
→
Heart failure
Clinical features
- Progressive exertional dyspnea and fatigue.
- Orthopnea, paroxysmal nocturnal dyspnea and pulmonary crackles.
- Peripheral edema, raised jugular venous pressure and weight gain.
- Third heart sound (S3) may be present.
- Palpitations, atrial fibrillation or ventricular arrhythmias.
Diagnostic clues
- Echocardiography: dilated ventricular chambers and reduced LVEF.
- ECG: may show nonspecific ST-T changes, conduction abnormalities or arrhythmias.
- Chest X-ray: may show cardiomegaly and pulmonary congestion.
- Cardiac MRI and laboratory investigations help determine etiology when indicated.
High-yield: DCM = dilated chambers + impaired systolic function. A reduced EF supports systolic dysfunction but does not identify its cause by itself.
B. Hypertrophic Cardiomyopathy (HCM)
HCM is characterized by increased myocardial thickness that cannot be explained solely by abnormal loading conditions. It is often inherited and may be associated with sarcomeric gene variants.
Pathophysiology
- Thickened myocardium, often involving the interventricular septum.
- Reduced ventricular compliance and impaired diastolic filling.
- Dynamic left ventricular outflow tract (LVOT) obstruction in some patients.
- Myocardial ischemia and ventricular arrhythmia risk.
Clinical manifestations
- Exertional dyspnea, chest discomfort and palpitations.
- Presyncope or syncope, particularly during exertion.
- Sudden cardiac death risk in selected high-risk patients.
- A systolic murmur may occur in obstructive HCM.
Classic examination point: In obstructive HCM, the systolic murmur typically becomes louder with Valsalva or standing and softer with squatting or passive leg elevation. These maneuvers alter preload and ventricular cavity size.
Management principles
- Beta-blockers are commonly used for symptomatic obstructive HCM.
- Verapamil or diltiazem may be considered in selected patients when appropriate.
- Cardiac myosin inhibitors, septal reduction therapy or disopyramide may be options for selected symptomatic patients under specialist care.
- Assess sudden cardiac death risk; an implantable cardioverter-defibrillator (ICD) is indicated for selected high-risk patients, not automatically for everyone with HCM.
- Genetic counselling and screening of appropriate relatives may be recommended.
Safety: In obstructive HCM, dehydration, excessive vasodilation and abrupt reductions in preload or afterload can worsen LVOT obstruction. Management must be individualized.
C. Restrictive Cardiomyopathy (RCM)
RCM is characterized by stiff ventricles with impaired diastolic filling. Ventricular dimensions and EF may remain relatively preserved early in the disease.
Common causes
- Amyloidosis.
- Endomyocardial fibrosis.
- Iron overload and selected storage disorders.
- Radiation-related or other infiltrative myocardial disease.
Clinical features
- Marked systemic venous congestion and peripheral edema.
- Raised jugular venous pressure, hepatomegaly and ascites.
- Exertional dyspnea and reduced exercise tolerance.
- Preserved EF may coexist with significantly impaired filling.
RCM = Rigid Chambers, Reduced filling. Think of a stiff ventricle rather than a dilated, weak ventricle.
D. Arrhythmogenic Cardiomyopathy (ACM)
- Often has an inherited basis, including desmosomal gene variants.
- Myocardial replacement and remodeling can create a substrate for ventricular arrhythmias.
- May present with palpitations, syncope, ventricular tachycardia or sudden cardiac arrest.
- Exercise history, family history, ECG, ambulatory monitoring, imaging and genetic evaluation may be important.
- Exercise restrictions and ICD decisions depend on the phenotype and individual risk assessment.
Priority: Syncope during exercise or suspected ventricular tachycardia in a patient with cardiomyopathy requires urgent evaluation.
E. Takotsubo Syndrome
- May follow intense emotional or physical stress, although a trigger is not always identified.
- Can mimic acute myocardial infarction with chest pain, ECG changes and elevated cardiac biomarkers.
- Imaging commonly shows transient regional ventricular dysfunction extending beyond a single coronary distribution.
- Acute coronary syndrome must be evaluated urgently; do not diagnose Takotsubo solely because a patient reports emotional stress.
F. Peripartum Cardiomyopathy
Peripartum cardiomyopathy is heart failure due to LV systolic dysfunction occurring toward the end of pregnancy or in the months following delivery, when no other cause adequately explains it.
- Features include dyspnea, orthopnea, edema, fatigue and pulmonary congestion.
- Urgently evaluate new or worsening breathlessness during pregnancy or postpartum rather than attributing it automatically to normal pregnancy.
- Echocardiography is central to assessment.
- Treatment depends on pregnancy or breastfeeding status, severity, and specialist guidance.
5. Clinical Manifestations
| Finding | Clinical significance |
|---|---|
| Dyspnea and orthopnea | Pulmonary congestion or elevated filling pressures |
| Crackles and hypoxemia | Possible pulmonary edema |
| Peripheral edema and raised JVP | Systemic venous congestion |
| S3 heart sound | May indicate volume overload and systolic dysfunction |
| Palpitations | Possible tachyarrhythmia or ectopy |
| Exertional syncope | Possible arrhythmia or hemodynamic compromise; urgent assessment |
| Hypotension, confusion, cold extremities | Possible low cardiac output or cardiogenic shock |
6. Diagnostic Investigations
| Investigation | Purpose / important finding |
|---|---|
| Transthoracic echocardiography | First-line structural assessment; ventricular size, wall thickness, EF, filling and valve function |
| 12-lead ECG | Arrhythmias, conduction changes, hypertrophy patterns and repolarization abnormalities |
| Cardiac MRI | Myocardial tissue characterization, fibrosis, inflammation and infiltrative disease |
| BNP or NT-proBNP | Supports assessment of heart failure in the appropriate clinical setting |
| Troponin | Assesses myocardial injury; may be elevated in several conditions |
| Chest X-ray | May show cardiomegaly, vascular congestion or pulmonary edema |
| Ambulatory ECG monitoring | Detects intermittent arrhythmias |
| Genetic testing / family assessment | Selected inherited phenotypes and cascade screening |
| Coronary evaluation | When ischemic disease needs to be excluded or assessed |
Important: Echocardiography is usually the initial imaging investigation for suspected cardiomyopathy. No single ECG pattern or biomarker can diagnose every type.
Ejection Fraction (EF)
Left ventricular ejection fraction estimates the proportion of end-diastolic ventricular blood volume ejected with each beat.
- A typical normal LVEF is approximately 50–70%, depending on the laboratory and method.
- LVEF of 40% or less is commonly used to define reduced EF in heart failure classification.
- Some patients have heart failure with preserved EF due to abnormal relaxation and elevated filling pressures.
EF is only one measure of cardiac function. Symptoms, hemodynamics, imaging and the underlying disease must also be considered.
7. Medical and Surgical Management
A. Heart failure with reduced EF (commonly DCM)
For eligible patients with chronic heart failure with reduced EF, guideline-directed therapy generally includes four major medication groups, adjusted to blood pressure, renal function, potassium, contraindications and clinical status.
| Medication group | Examples | Nursing considerations |
|---|---|---|
| ARNI / ACE inhibitor / ARB | Sacubitril-valsartan; enalapril; candesartan | Monitor BP, renal function and potassium; observe contraindications |
| Evidence-based beta-blocker | Carvedilol, bisoprolol, metoprolol succinate | Monitor HR, BP and signs of decompensation; initiate or titrate when clinically stable |
| Mineralocorticoid receptor antagonist | Spironolactone, eplerenone | Monitor potassium and renal function |
| SGLT2 inhibitor | Dapagliflozin, empagliflozin | Monitor volume status, renal function and relevant adverse effects |
| Diuretic when congested | Furosemide | Monitor urine output, weight, BP, electrolytes and renal function |
Other treatment may include treatment of the underlying cause, anticoagulation when specifically indicated, management of arrhythmias, and specialist assessment for devices or advanced therapies.
B. Device and advanced therapies
- ICD: Prevents sudden arrhythmic death in selected patients meeting risk or EF-based criteria.
- CRT: May improve synchrony in appropriately selected patients with heart failure and electrical conduction delay.
- LVAD: Mechanical circulatory support for selected patients with advanced heart failure.
- Heart transplantation: Considered for carefully selected patients with advanced refractory disease.
- Septal reduction therapy: Considered in selected symptomatic obstructive HCM.
C. Lifestyle and patient education
- Take prescribed medication regularly; do not stop beta-blockers or other heart medicines abruptly without medical advice.
- Monitor daily weight when advised and report rapid weight gain or increasing edema.
- Follow individualized sodium and fluid advice; avoid assuming that every patient requires the same fluid restriction.
- Avoid tobacco and harmful alcohol exposure.
- Follow individualized exercise advice. High-intensity exercise may be unsafe in certain inherited cardiomyopathies.
- Attend follow-up appointments and discuss family screening when inherited disease is suspected.
8. Nursing Management and Priorities
Initial assessment: ABCDE
A — Airway
B — Breathing
C — Circulation
D — Disability
E — Exposure / examination
- Assess airway and breathing: Respiratory rate, work of breathing, SpO₂, lung sounds and ability to speak.
- Assess circulation: BP, HR, rhythm, peripheral perfusion, capillary refill, JVP and edema.
- Position appropriately: Sit the patient upright if breathless and hemodynamically able.
- Administer oxygen when indicated: Treat hypoxemia and follow emergency protocols; oxygen is not routinely required for every normoxemic heart failure patient.
- Monitor ECG: Watch for sustained ventricular arrhythmias, rapid atrial fibrillation and conduction abnormalities.
- Monitor fluid balance: Record intake/output as indicated and obtain daily weight under consistent conditions.
- Administer prescribed therapy: Assess BP, renal function, electrolytes and other medication-specific parameters.
- Escalate deterioration: Report hypotension, altered consciousness, worsening respiratory distress, chest pain or reduced urine output promptly.
Common nursing diagnoses
- Decreased cardiac output related to impaired myocardial function.
- Excess fluid volume related to compromised cardiac pumping.
- Activity intolerance related to an imbalance between oxygen supply and demand.
- Impaired gas exchange related to pulmonary congestion.
- Anxiety related to breathlessness and risk of deterioration.
- Deficient knowledge regarding medication adherence and self-monitoring.
Priority nursing question: A patient with cardiomyopathy develops severe breathlessness, SpO₂ 82%, and bilateral crackles. The immediate priority is to assess and support airway and breathing, call for emergency assistance, position upright if tolerated, and provide oxygen/ventilatory support according to the patient's condition and protocol. Do not delay escalation while completing routine documentation.
9. Complications and Emergency Care
- Acute or chronic heart failure.
- Pulmonary edema and respiratory failure.
- Atrial fibrillation and ventricular tachycardia/fibrillation.
- Sudden cardiac arrest.
- Intracardiac thrombus and systemic embolism in selected patients.
- Cardiogenic shock.
Suspected cardiogenic shock
Concerning findings include hypotension, altered mental status, cold clammy skin, weak pulses, oliguria and signs of poor organ perfusion. Shock can occur even before profound hypotension is evident.
Emergency priorities: Activate emergency response, assess ABCs, establish continuous monitoring, obtain IV access as appropriate, assess perfusion and investigate the cause. Provide oxygen or ventilatory support when indicated. Vasopressors, inotropes and mechanical circulatory support require specialist-directed management. Avoid indiscriminate fluid loading in a patient with pulmonary congestion.
Sudden cardiac arrest
If the patient is unresponsive and not breathing normally, activate the emergency response system, begin high-quality CPR and use an AED/defibrillator as soon as available. Follow current resuscitation protocols.
10. High-Yield Comparison Table
| Feature | DCM | HCM | RCM |
|---|---|---|---|
| Ventricle | Dilated | Thickened | Stiff; often normal-sized early |
| Main dysfunction | Systolic | Diastolic, sometimes obstructive | Diastolic |
| EF | Often reduced | Often preserved or high | Often preserved early |
| Classic clue | Heart failure with dilated chambers | Exertional syncope, dynamic murmur | Venous congestion and impaired filling |
| Important risk | Heart failure, arrhythmias, thrombus in selected cases | Ventricular arrhythmia and sudden death in selected high-risk patients | Progressive heart failure and underlying infiltrative disease |
11. Mnemonics and Exam Pearls
“D-H-R” — The three classic patterns
- D — Dilated: weak pump, reduced systolic function.
- H — Hypertrophic: thick muscle, impaired relaxation ± obstruction.
- R — Restrictive: rigid ventricle, impaired filling.
Cardiomyopathy red flags — “SCARE”
- S — Syncope, especially during exertion.
- C — Chest pain or acute respiratory distress.
- A — Arrhythmia or palpitations with instability.
- R — Reduced perfusion, hypotension or oliguria.
- E — Edema and escalating breathlessness.
Last-minute revision facts
- DCM is classically associated with ventricular dilation and reduced systolic function.
- HCM may cause dynamic LVOT obstruction; its murmur often increases with Valsalva.
- RCM causes impaired filling due to ventricular stiffness.
- Echocardiography is the key initial imaging investigation.
- Exertional syncope in suspected HCM requires urgent assessment.
- Daily weights and fluid-status monitoring help assess congestion in heart failure.
- ICD placement depends on individualized risk assessment and established indications.
- Acute breathlessness with hypoxemia requires immediate ABC assessment and escalation.
Educational resource for exam preparation. Clinical assessment and treatment must follow current institutional protocols and applicable professional guidelines.
12. Cardiomyopathy MCQ Practice Test
25 Clinical & Priority-Based Questions | NORCET Practice
Time: 30 minutes | One question at a time | 1 mark per correct answer
Instructions
- Attempt all 25 questions within 30 minutes.
- Select one best answer per question.
- Use Next and Previous to navigate.
- Your answer is saved when you select an option.
- Submit to view your score, explanations and answer review.
Continue Your NORCET Preparation
After completing this topic, revise the related cardiovascular disorders: heart failure, rheumatic heart disease, valvular heart disease, coronary artery disease and myocardial infarction.
UPNURSING NOTES — Study systematically, practise clinical scenarios and review every incorrect answer.