Cardiology — MCQs
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Diagnose the cardiac disorder based on the provided ECG findings.
What is the typical area of the mitral valve in severe mitral stenosis during pregnancy?
A 60-year-old male, diabetic and smoker, presents with 3 hours of substernal chest pain. Which of the following statements is true regarding his ECG findings?
A 44-year-old woman presents with a 4-year history of increasing dyspnea and fatigue. Physical examination reveals increased JVP and a reduced carotid pulse. Precordial examination reveals a left parasternal lift, loud P2, and right-sided S3 and S4. There are no audible murmurs. Chest X-ray reveals clear lung fields and an ECG shows evidence of right ventricular hypertrophy. Pulmonary function tests show a slight restrictive pattern. A diagnosis of primary pulmonary hypertension (PPH) is made. Which of the following is the most likely cause of death in this condition?
Which of the following is NOT a component of the classical triad of ECG changes in pericardial effusion with cardiac tamponade?
Which of the following is NOT true regarding beta-blocker therapy in patients with congestive heart failure?
Which of the following is NOT a high-risk lesion for Infective Endocarditis?
A patient presents with sharp, shooting retrosternal pain that progresses downward, initially felt between the scapulae and later migrating to the epigastric region. On examination, the patient has feeble lower limb pulses compared to the upper limbs. This clinical presentation is highly suggestive of which of the following conditions?
Which of the following is true regarding atrial fibrillation?
Duke's criteria is used for the evaluation of what condition?
Cardiology Indian Medical PG Practice Questions and MCQs
Question 401: Diagnose the cardiac disorder based on the provided ECG findings.
- A. Right Bundle Branch Block (RBBB)
- B. Hyperkalemia
- C. Digitalis toxicity
- D. Anterior wall MI (Correct Answer)
Explanation: ***Anterior wall MI*** - **ST elevation in leads V1-V4** and the development of **pathological Q waves** are classic ECG findings of anterior wall myocardial infarction. - **Loss of R wave progression** in precordial leads and reciprocal changes in inferior leads further confirm anterior wall involvement. *Right Bundle Branch Block (RBBB)* - RBBB shows **wide QRS complexes (>120ms)** with **RSR' pattern in V1** and **wide S waves in leads I and V6**. - **No ST elevation** or Q waves are typically seen in uncomplicated RBBB, unlike anterior wall MI. *Hyperkalemia* - ECG findings include **tall, peaked T waves**, **prolonged PR interval**, and **widened QRS complexes** in severe cases. - **Absence of ST elevation** and Q waves distinguishes hyperkalemia from anterior wall MI. *Digitalis toxicity* - Characteristic findings include **sagging ST depression** (Salvador Dali sign) and **shortened QT interval**. - **Arrhythmias** like atrial tachycardia with block or ventricular ectopics are common, not the ST elevation pattern of MI.
Question 402: What is the typical area of the mitral valve in severe mitral stenosis during pregnancy?
- A. 4-6 cm2
- B. 1-1.5 cm2 (Correct Answer)
- C. 1.5-2.5 cm2
- D. 0.8-1 cm2
Explanation: **Explanation:** The severity of Mitral Stenosis (MS) is primarily determined by the Mitral Valve Area (MVA). In the context of pregnancy, MS is the most common valvular heart disease encountered and poses significant risks due to the physiological increase in cardiac output and heart rate. **1. Why Option B is Correct:** According to standard clinical guidelines (including AHA/ACC and Braunwald), **Severe Mitral Stenosis** is defined as an **MVA ≤ 1.5 cm²**. While in non-pregnant states, "very severe" MS is often cited as < 1.0 cm², for the purpose of clinical management and risk stratification in pregnancy, the threshold for "severe" symptomatic MS is typically recognized in the **1.0–1.5 cm²** range [1]. At this area, the valve cannot accommodate the 30-50% increase in blood volume seen in pregnancy, leading to pulmonary congestion. **2. Why Other Options are Incorrect:** * **Option A (4-6 cm²):** This is the **normal** mitral valve area in a healthy adult. * **Option B (1.5-2.5 cm²):** This range represents **Mild to Moderate MS**. Patients in this range usually tolerate pregnancy well unless they develop tachycardia or atrial fibrillation [1]. * **Option D (0.8-1 cm²):** This represents **Very Severe MS**. While this is technically "severe," it is a subset of the broader 1.0-1.5 cm² category used in most standard MCQ frameworks for defining the threshold of severe disease. **NEET-PG High-Yield Pearls:** * **Most common cause:** Rheumatic Heart Disease (RHD). * **Physiological trigger:** Pregnancy increases heart rate, shortening diastole. This reduces the time available for blood to flow through the stenotic valve, causing a sudden rise in Left Atrial Pressure and **Pulmonary Edema** [1]. * **Management:** Beta-blockers (to slow HR) are first-line [1]. If refractory, **Percutaneous Transvenous Mitral Commissurotomy (PTMC)** is the procedure of choice, ideally performed in the second trimester [1]. * **Labor:** Vaginal delivery with epidural anesthesia is preferred to minimize hemodynamic swings.
Question 403: A 60-year-old male, diabetic and smoker, presents with 3 hours of substernal chest pain. Which of the following statements is true regarding his ECG findings?
- A. Heart rate is 45/min.
- B. ECG shows acute anterior myocardial infarction. (Correct Answer)
- C. The patient should be given IV lidocaine.
- D. ECG is suggestive of hypokalemia.
Explanation: ***ECG shows acute anterior myocardial infarction.*** - A 60-year-old diabetic smoker with **3 hours of substernal chest pain** is at high risk for **acute STEMI**, and anterior MI would show **ST elevation in leads V1-V4/V5**. - **Diabetes** and **smoking** are major risk factors for coronary artery disease, making acute anterior MI the most likely diagnosis with typical chest pain presentation. *Heart rate is 45/min.* - The ECG would more likely show **normal or elevated heart rate** (compensatory tachycardia) during acute MI, not bradycardia. - **Bradycardia at 45/min** would be unusual in acute anterior MI unless there's concomitant **heart block** or **inferior wall involvement**. *The patient should be given IV lidocaine.* - **IV lidocaine** is no longer routinely recommended for acute STEMI as it can worsen outcomes and cause **pro-arrhythmic effects**. - Current treatment focuses on **immediate reperfusion therapy** (PCI or thrombolytics), **dual antiplatelet therapy**, and **anticoagulation**. *ECG is suggestive of hypokalemia.* - **Hypokalemia** typically shows **U waves**, **flattened T waves**, and **prolonged QT interval**, not the acute changes seen in MI. - The clinical presentation of **acute chest pain** in a high-risk patient points toward **ischemic changes** rather than electrolyte abnormalities.
Question 404: A 44-year-old woman presents with a 4-year history of increasing dyspnea and fatigue. Physical examination reveals increased JVP and a reduced carotid pulse. Precordial examination reveals a left parasternal lift, loud P2, and right-sided S3 and S4. There are no audible murmurs. Chest X-ray reveals clear lung fields and an ECG shows evidence of right ventricular hypertrophy. Pulmonary function tests show a slight restrictive pattern. A diagnosis of primary pulmonary hypertension (PPH) is made. Which of the following is the most likely cause of death in this condition?
- A. Intractable left ventricular failure
- B. Intractable respiratory failure
- C. Massive pulmonary embolism
- D. Intractable right ventricular failure or sudden death (Correct Answer)
Explanation: ### Explanation **Correct Answer: D. Intractable right ventricular failure or sudden death** **Pathophysiology:** Primary Pulmonary Hypertension (PPH), now classified under Group 1 Pulmonary Arterial Hypertension (PAH), is characterized by progressive remodeling of small pulmonary arteries. This leads to a sustained increase in pulmonary vascular resistance (PVR). The **Right Ventricle (RV)** must pump against this high pressure, leading to compensatory RV hypertrophy (evidenced by the parasternal lift and ECG findings in this patient) [1]. Eventually, the RV can no longer compensate, leading to **Cor Pulmonale** (right-sided heart failure). Most patients die from progressive low cardiac output and intractable RV failure or sudden cardiac death, likely due to arrhythmias or acute ischemia of the hypertrophied RV. **Why other options are incorrect:** * **A. Intractable left ventricular failure:** PPH primarily affects the right heart. While the interventricular septum may bulge into the left ventricle (Bernheim effect), the primary pathology and cause of death are right-sided. * **B. Intractable respiratory failure:** Despite the dyspnea, the lung parenchyma remains relatively clear (as seen on CXR) [1]. Death is typically hemodynamic (circulatory collapse) rather than a failure of gas exchange. * **C. Massive pulmonary embolism:** While patients with PPH are at a higher risk for *in-situ* thrombosis due to sluggish flow, it is not the most common cause of death compared to the inevitable progression of RV failure. **NEET-PG High-Yield Pearls:** * **Clinical Signs:** Loud $P_2$ (hallmark of pulmonary hypertension), Right-sided $S_3$ (sign of RV failure), and $S_4$ (sign of decreased RV compliance) [1]. * **ECG Findings:** Right axis deviation, RSR' in $V_1$, and tall R waves in $V_1-V_2$ [2]. * **Definitive Diagnosis:** Right heart catheterization showing Mean Pulmonary Artery Pressure (mPAP) $> 20$ mmHg at rest. * **Treatment:** Vasodilators (Calcium channel blockers if Comic reactive), Endothelin receptor antagonists (Bosentan), and PDE-5 inhibitors (Sildenafil).
Question 405: Which of the following is NOT a component of the classical triad of ECG changes in pericardial effusion with cardiac tamponade?
- A. Sinus tachycardia
- B. Prolonged ST segment (Correct Answer)
- C. Low voltage QRS complex
- D. Electrical alternans
Explanation: In cardiac tamponade, the accumulation of fluid in the pericardial space increases intrapericardial pressure, leading to compression of the heart chambers and reduced diastolic filling [1]. This physiological stress manifests as a specific triad of ECG findings. **Why "Prolonged ST segment" is the correct answer:** ST-segment changes in pericardial disease are typically associated with **acute pericarditis** (showing diffuse ST-elevation with PR-depression) [2]. A "prolonged ST segment" is not a feature of tamponade; rather, it is classically seen in **hypocalcemia**. In tamponade, the ECG reflects the physical presence of fluid and the heart's compensatory mechanisms, not a delay in ventricular repolarization. **Explanation of incorrect options:** * **Sinus Tachycardia:** This is the **most common** ECG finding. It is a compensatory mechanism to maintain cardiac output (CO = Stroke Volume × Heart Rate) as stroke volume falls due to compression. * **Low voltage QRS complex:** Defined as QRS amplitude <5mm in limb leads and <10mm in precordial leads. This occurs because the pericardial fluid acts as an "insulator," dampening the electrical signal reaching the surface electrodes [1]. * **Electrical Alternans:** This is a **pathognomonic** (highly specific) finding. It refers to the beat-to-beat variation in QRS amplitude or axis, caused by the heart physically "swinging" back and forth within the large volume of fluid [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Beck’s Triad (Clinical):** Hypotension, Jugular Venous Distension (JVD), and Muffled heart sounds. * **Pulsus Paradoxus:** A drop in systolic BP >10 mmHg during inspiration; a hallmark of tamponade. * **Chest X-ray:** Shows a "Water-bottle" or "Money-bag" heart [1]. * **Treatment:** Immediate **Pericardiocentesis** is the gold standard for management [1].
Question 406: Which of the following is NOT true regarding beta-blocker therapy in patients with congestive heart failure?
- A. They should be started with optimum doses. (Correct Answer)
- B. They should be gradually increased over weeks.
- C. Special precautions should be taken in cases of NYHA class 3 and 4.
- D. Carvedilol and metoprolol are preferred drugs.
Explanation: The correct answer is **A**. In patients with Congestive Heart Failure (CHF), beta-blockers must never be started at "optimum" (target) doses. Because beta-blockers have negative inotropic effects, initiating them at high doses can precipitate acute decompensation or cardiogenic shock. The standard clinical practice is to **"start low and go slow,"** beginning with a very small dose and up-titrating gradually. **Analysis of Options:** * **Option B:** This is a true statement. Dose titration should occur gradually, typically doubling the dose every 2–4 weeks, until the maximum tolerated or target dose is reached. * **Option C:** This is true. Patients in NYHA Class III and IV are hemodynamically fragile. Beta-blockers should only be initiated when the patient is **euvolemic** (stable, dry weight) and not during an acute exacerbation. * **Option D:** This is true. Large clinical trials (e.g., MERIT-HF, COPERNICUS) have proven mortality benefits for specific beta-blockers: **Carvedilol** (non-selective + alpha-1 blocker), **Metoprolol succinate** (long-acting), and **Bisoprolol**. Beta-blockers are more effective at reducing mortality than ACE inhibitors [1]. **NEET-PG High-Yield Pearls:** * **Mortality Benefit:** Beta-blockers reduce mortality in HFrEF by preventing "catecholamine toxicity," reducing remodeling, and decreasing arrhythmic sudden death. * **The "Big Three":** Only Bisoprolol, Carvedilol, and Metoprolol Succinate (not Tartrate) are FDA-approved for heart failure mortality reduction. **Nebivolol** is also used, especially in the elderly (SENIORS trial). * **Contraindications:** Avoid in patients with symptomatic bradycardia, advanced heart block (without a pacemaker), or severe reactive airway disease (asthma).
Question 407: Which of the following is NOT a high-risk lesion for Infective Endocarditis?
- A. Prosthetic heart valves
- B. Prior history of infective endocarditis
- C. Aortic regurgitation (Correct Answer)
- D. Complex cyanotic congenital heart disease
Explanation: ### Explanation The classification of cardiac conditions for Infective Endocarditis (IE) risk has evolved significantly under the **AHA/ESC guidelines**. The focus for antibiotic prophylaxis is now restricted only to those with the **highest risk** of adverse outcomes [1]. **Why Aortic Regurgitation (Option C) is the correct answer:** While Aortic Regurgitation (AR) involves turbulent blood flow that can damage the endocardium, it is classified as a **moderate-risk** lesion. Current guidelines no longer recommend routine antibiotic prophylaxis for native valvular diseases (like AR, MR, or bicuspid aortic valves), making it the "least high-risk" option among the choices provided [1]. **Analysis of Incorrect Options (High-Risk Lesions):** * **A. Prosthetic heart valves:** These represent the highest risk for IE due to the presence of non-biological material, which facilitates bacterial adherence and biofilm formation [1]. * **B. Prior history of IE:** Patients with a previous episode of IE have damaged endocardial surfaces and altered hemodynamics, significantly increasing the risk of recurrence [2]. * **D. Complex cyanotic congenital heart disease:** Conditions like Tetralogy of Fallot or Transposition of the Great Arteries involve high-pressure shunts and chronic hypoxia, which are primary substrates for vegetation formation. **NEET-PG High-Yield Pearls:** 1. **Prophylaxis Indication:** Antibiotic prophylaxis (usually **Amoxicillin 2g** orally 30-60 mins before the procedure) is indicated **ONLY** for the high-risk groups mentioned above and only for **dental procedures** involving manipulation of gingival tissue or the periapical region of teeth. 2. **Low-Risk/No Prophylaxis:** ASD (secundum), CABG, cardiac pacemakers, and physiological murmurs require no prophylaxis. 3. **Most Common Valve:** Mitral valve is most commonly affected in IE overall; however, in IV drug users, the **Tricuspid valve** is most common (*Staph. aureus*).
Question 408: A patient presents with sharp, shooting retrosternal pain that progresses downward, initially felt between the scapulae and later migrating to the epigastric region. On examination, the patient has feeble lower limb pulses compared to the upper limbs. This clinical presentation is highly suggestive of which of the following conditions?
- A. Coarctation of the aorta
- B. Dissecting aneurysm of the aorta (Correct Answer)
- C. Peripheral vascular disease
- D. Aortitis
Explanation: The clinical presentation is a classic description of an **Aortic Dissection (Dissecting Aneurysm)**. The hallmark of this condition is sudden, "tearing" or "sharp" chest pain that **migrates** in the direction of the dissection [1]. Pain felt between the scapulae suggests involvement of the descending aorta (Stanford Type B), while the progression to the epigastrium indicates the dissection is extending inferiorly [1]. The **feeble lower limb pulses** (pulse deficit) occur because the false lumen or an intimal flap can compress or occlude the iliac or femoral arteries, creating a blood pressure discrepancy between the upper and lower extremities. **Analysis of Incorrect Options:** * **Coarctation of the Aorta:** While this also presents with radio-femoral delay and pulse disparity, it is a congenital narrowing. It presents with chronic hypertension and claudication, not acute, migrating, "shooting" retrosternal pain [1]. * **Peripheral Vascular Disease (PVD):** This typically presents with intermittent claudication (pain on walking) and chronic skin changes [2]. It does not cause acute, migrating retrosternal or interscapular pain. * **Aortitis:** This refers to inflammation of the aortic wall (e.g., Takayasu arteritis). While it can cause pulse loss ("pulseless disease"), it usually presents with systemic inflammatory symptoms (fever, malaise) and chronic ischemia rather than acute migrating pain. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** CT Angiography (stable patients) or Transesophageal Echocardiogram (unstable patients). * **Stanford Classification:** Type A involves the ascending aorta (requires surgery); Type B involves only the descending aorta (managed medically with BP control) [1]. * **Risk Factors:** Hypertension (most common), Marfan Syndrome, and Ehlers-Danlos Syndrome [1]. * **Chest X-ray:** Look for "widened mediastinum" and the "calcium sign."
Question 409: Which of the following is true regarding atrial fibrillation?
- A. Thromboembolism is a risk (Correct Answer)
- B. Adrenaline is a treatment
- C. Anticoagulant is not required
- D. Aspirin is given
Explanation: **Explanation:** **Atrial Fibrillation (AF)** is characterized by disorganized atrial electrical activity leading to an ineffective atrial "kick." [1] **1. Why Option A is Correct:** In AF, the lack of coordinated atrial contraction leads to **stasis of blood**, particularly in the **Left Atrial Appendage (LAA)** [2]. This stasis promotes thrombus formation. If these thrombi dislodge, they enter the systemic circulation, causing **thromboembolism**. The most dreaded complication is an embolic stroke; AF increases the risk of stroke fivefold. **2. Why the Other Options are Incorrect:** * **Option B:** Adrenaline is a sympathomimetic that increases heart rate and excitability. In AF, the goal is usually rate or rhythm control [3]; adrenaline would worsen tachycardia and could precipitate hemodynamic instability. * **Option C:** Anticoagulation is the cornerstone of AF management to prevent stroke. The need for anticoagulation is determined by the **CHA₂DS₂-VASc score** [2]. * **Option D:** Recent guidelines (AHA/ESC) have moved away from Aspirin for stroke prevention in AF. Aspirin is significantly less effective than anticoagulants (like Warfarin or NOACs) and carries a comparable risk of major bleeding in elderly patients. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Hallmarks:** Irregularly irregular rhythm, absence of P waves, and presence of fibrillatory (f) waves. * **Most common site of thrombus:** Left Atrial Appendage (LAA). * **Treatment Strategy:** * **Rate Control:** Beta-blockers (first-line), Calcium Channel Blockers (Verapamil/Diltiazem), or Digoxin [2]. * **Rhythm Control:** DC Cardioversion or drugs like Amiodarone/Flecainide [1]. * **Anticoagulation:** NOACs (Apixaban, Rivaroxaban) are now preferred over Warfarin unless the patient has valvular AF (mitral stenosis or prosthetic valves) [4].
Question 410: Duke's criteria is used for the evaluation of what condition?
- A. Congestive Heart Failure (CHF)
- B. Severity of Aortic Stenosis
- C. Chronic Stable Angina
- D. Infective Endocarditis (Correct Answer)
Explanation: **Explanation:** **Duke’s Criteria** (specifically the Modified Duke Criteria) is the gold standard clinical tool used for the diagnosis of **Infective Endocarditis (IE)** [1]. It categorizes findings into **Major** and **Minor** criteria based on microbiological evidence (blood cultures) and echocardiographic findings (vegetations, abscesses, or new valvular regurgitation) [1]. A definite diagnosis requires 2 Major, 1 Major + 3 Minor, or 5 Minor criteria [1]. **Analysis of Options:** * **A. Congestive Heart Failure (CHF):** The diagnosis of CHF is primarily clinical, often guided by the **Framingham Criteria** and supported by BNP levels and echocardiography. * **B. Severity of Aortic Stenosis:** This is assessed using **Echocardiography** (measuring peak velocity, mean gradient, and valve area) and clinical symptoms. There is no "Duke’s criteria" for valvular grading. * **C. Chronic Stable Angina:** This is evaluated using the **Canadian Cardiovascular Society (CCS) Grading** for functional classification and stress testing/coronary angiography for diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Major Criteria:** 2 positive blood cultures for typical organisms (e.g., *S. aureus*, *Viridans strep*) and evidence of endocardial involvement on Echo [1]. * **Minor Criteria:** Predisposition (IV drug use/heart condition), Fever (≥38°C), Vascular phenomena (Janeway lesions, emboli), and Immunological phenomena (Roth spots, Osler nodes, Glomerulonephritis) [1]. * **Most Common Cause:** *Staphylococcus aureus* is now the most common cause of acute IE globally and in IV drug users [1]. * **Culture-Negative IE:** Most commonly caused by prior antibiotic use or HACEK group organisms.
Practice by Chapter
Coronary Artery Disease and Angina
Practice Questions
Acute Coronary Syndromes
Practice Questions
Heart Failure
Practice Questions
Cardiac Arrhythmias
Practice Questions
Valvular Heart Diseases
Practice Questions
Cardiomyopathies
Practice Questions
Pericardial Diseases
Practice Questions
Congenital Heart Disease in Adults
Practice Questions
Hypertension and Hypertensive Emergencies
Practice Questions
Pulmonary Hypertension
Practice Questions
Non-invasive Cardiac Diagnostics
Practice Questions
Preventive Cardiology
Practice Questions
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