Cardiology Practice Questions

Q: Diagnose the cardiac disorder based on the provided ECG findings.

Anterior wall MI. ***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.

Q: 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?

ECG shows acute anterior myocardial infarction.. ***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.

Q: Which of the following is NOT a component of the classical triad of ECG changes in pericardial effusion with cardiac tamponade?

Prolonged ST segment. 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].

Q: Which of the following is NOT true regarding beta-blocker therapy in patients with congestive heart failure?

They should be started with optimum doses.. 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).

Q: Which of the following is NOT a high-risk lesion for Infective Endocarditis?

Aortic regurgitation. ### 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*).

Q: 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?

Dissecting aneurysm of the aorta. 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."

Q: Which of the following is true regarding atrial fibrillation?

Thromboembolism is a risk. **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].

Q: Duke's criteria is used for the evaluation of what condition?

Infective Endocarditis. **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.

Question 1

Diagnose the cardiac disorder based on the provided ECG findings.

Accepted Answer

Anterior wall MI

Answer

Right Bundle Branch Block (RBBB)

Answer

Hyperkalemia

Answer

Digitalis toxicity

Question 2

What is the typical area of the mitral valve in severe mitral stenosis during pregnancy?

Accepted Answer

1-1.5 cm2

Answer

4-6 cm2

Answer

1.5-2.5 cm2

Answer

0.8-1 cm2

Question 3

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?

Accepted Answer

ECG shows acute anterior myocardial infarction.

Answer

Heart rate is 45/min.

Answer

The patient should be given IV lidocaine.

Answer

ECG is suggestive of hypokalemia.

Question 4

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?

Accepted Answer

Intractable right ventricular failure or sudden death

Answer

Intractable left ventricular failure

Answer

Intractable respiratory failure

Answer

Massive pulmonary embolism

Question 5

Which of the following is NOT a component of the classical triad of ECG changes in pericardial effusion with cardiac tamponade?

Accepted Answer

Prolonged ST segment

Answer

Sinus tachycardia

Answer

Low voltage QRS complex

Answer

Electrical alternans

Question 6

Which of the following is NOT true regarding beta-blocker therapy in patients with congestive heart failure?

Accepted Answer

They should be started with optimum doses.

Answer

They should be gradually increased over weeks.

Answer

Special precautions should be taken in cases of NYHA class 3 and 4.

Answer

Carvedilol and metoprolol are preferred drugs.

Question 7

Which of the following is NOT a high-risk lesion for Infective Endocarditis?

Accepted Answer

Aortic regurgitation

Answer

Prosthetic heart valves

Answer

Prior history of infective endocarditis

Answer

Complex cyanotic congenital heart disease

Question 8

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?

Accepted Answer

Dissecting aneurysm of the aorta

Answer

Coarctation of the aorta

Answer

Peripheral vascular disease

Answer

Aortitis

Question 9

Which of the following is true regarding atrial fibrillation?

Accepted Answer

Thromboembolism is a risk

Answer

Adrenaline is a treatment

Answer

Anticoagulant is not required

Answer

Aspirin is given

Question 10

Duke's criteria is used for the evaluation of what condition?

Accepted Answer

Infective Endocarditis

Answer

Congestive Heart Failure (CHF)

Answer

Severity of Aortic Stenosis

Answer

Chronic Stable Angina

Cardiology — MCQs

Cardiology — MCQs

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