Cardiology Practice Questions

Q: A young male with acute myeloid leukemia was treated with induction chemotherapy. Two months later, he presents with bilateral pedal edema and dyspnea on exertion, as well as paroxysmal nocturnal dyspnea. Which of the following is the most likely cause of his current symptoms?

Dilated cardiomyopathy. **Explanation:** The clinical presentation of bilateral pedal edema, dyspnea on exertion, and paroxysmal nocturnal dyspnea (PND) in a patient previously treated for Acute Myeloid Leukemia (AML) strongly suggests **congestive heart failure (CHF)** [1]. The most likely cause is **Dilated Cardiomyopathy (DCM)** secondary to **Anthracycline-induced cardiotoxicity**. Anthracyclines (e.g., Doxorubicin, Daunorubicin) are the backbone of AML induction therapy. They cause dose-dependent, irreversible myocardial damage through the formation of iron-anthracycline complexes and free radicals, leading to lipid peroxidation of the cardiomyocyte membranes. This results in ventricular dilatation and impaired systolic function (reduced ejection fraction). **Why other options are incorrect:** * **Restrictive Cardiomyopathy:** Usually associated with infiltrative disorders like amyloidosis or post-radiation fibrosis. While some chemo agents cause this, anthracyclines characteristically lead to a dilated phenotype. * **Hypertrophic Cardiomyopathy:** This is typically a genetic condition (mutations in sarcomeric proteins) and is not a known complication of chemotherapy. * **Pericardial Fibrosis:** This leads to constrictive pericarditis, often seen after chest radiation or chronic inflammation, rather than as a direct result of standard AML induction chemotherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Doxorubicin Toxicity:** The risk increases significantly once the cumulative dose exceeds **450–550 mg/m²**. * **Monitoring:** Baseline and periodic **Echocardiography or MUGA scans** are mandatory to monitor the Left Ventricular Ejection Fraction (LVEF) [2]. * **Prevention:** **Dexrazoxane** (an iron chelator) can be used to reduce free radical formation and protect the myocardium in high-risk patients. * **Histology:** Look for "myofibrillar loss and cytoplasmic vacuolization" on endomyocardial biopsy.

Q: Which of the following is not an indicator of chronic congestive heart failure?

Siuin. In the context of chronic congestive heart failure (CHF), clinicians rely on specific biomarkers to assess myocardial stress, systemic inflammation, and ongoing injury. **Why "Siuin" is the correct answer:** The term **"Siuin"** is not a recognized medical biomarker or clinical indicator for heart failure. It appears to be a distractor or a typographical error in the question source. In medical examinations, identifying the "nonsense" term among established clinical markers is a key test-taking skill. **Analysis of Incorrect Options:** * **Brain Natriuretic Peptide (BNP):** This is the gold-standard biomarker for CHF [1]. It is released by the ventricles in response to increased wall tension and volume overload [1]. It has a high negative predictive value for excluding heart failure. * **CRP (C-Reactive Protein):** Chronic CHF is increasingly recognized as a pro-inflammatory state. Elevated CRP levels are common in heart failure patients and serve as an indicator of systemic inflammation and poor long-term prognosis. * **Troponin:** While primarily used for acute coronary syndromes [2], chronic low-level elevations of Troponin (especially high-sensitivity Troponin) are frequently seen in chronic CHF. This indicates ongoing subclinical cardiomyocyte necrosis or "leakage" due to wall stress and is a marker of disease severity [2]. **High-Yield Clinical Pearls for NEET-PG:** * **BNP vs. NT-proBNP:** NT-proBNP has a longer half-life and is more stable than BNP. * **The "Rule Out" Value:** BNP <100 pg/mL or NT-proBNP <300 pg/mL effectively rules out acute heart failure [1]. * **Neprilysin Inhibitors (ARNI):** Patients on Sacubitril/Valsartan will have **elevated BNP** levels (as the drug prevents its breakdown), so **NT-proBNP** must be used instead to monitor these patients.

Q: Pseudo-P-Pulmonale is typically seen in which electrolyte imbalance?

Hypokalemia. **Explanation:** **Pseudo-P-Pulmonale** refers to an increase in the amplitude of the P-wave (typically >2.5 mm in lead II) that mimics the "P-Pulmonale" seen in right atrial enlargement. However, in this context, it is a transient ECG change caused by metabolic disturbances rather than structural heart disease. 1. **Why Hypokalemia is correct:** In **Hypokalemia**, the resting membrane potential of the atrial myocytes is altered [1]. This leading to an increase in the amplitude of the P-wave and a decrease in its duration. This creates a tall, peaked P-wave. When combined with the characteristic **ST-depression, T-wave inversion, and prominent U-waves** of hypokalemia, the ECG morphology is classic for this electrolyte imbalance [1]. 2. **Why other options are incorrect:** * **Hyponatremia:** Sodium imbalances primarily affect neurological status (seizures, cerebral edema) and do not typically produce specific diagnostic ECG changes like tall P-waves [1]. * **Hypocalcemia:** Characterized by **prolongation of the QT interval** (specifically the ST segment) due to delayed repolarization. It does not affect P-wave morphology. * **Hypercalcemia:** Characterized by **shortening of the QT interval** and occasionally the presence of an Osborne wave (J-wave), but not Pseudo-P-Pulmonale. **High-Yield Clinical Pearls for NEET-PG:** * **True P-Pulmonale:** Seen in Right Atrial Enlargement (e.g., COPD, Cor Pulmonale). * **P-Mitrale:** Notched, broad P-wave seen in Left Atrial Enlargement (e.g., Mitral Stenosis). * **Hypokalemia ECG Sequence:** T-wave flattening → ST depression → Prominent U-waves → Pseudo-P-Pulmonale [1]. * **Hyperkalemia ECG Sequence:** Tall tented T-waves → Prolonged PR interval → Loss of P-wave → Sine wave pattern [1].

Q: During dental treatment in a patient with a previous history of congestive cardiac failure, what is the preferable patient position if they show signs and symptoms?

Upright position. **Explanation:** The correct answer is **B. Upright position**. **Medical Rationale:** Patients with a history of Congestive Cardiac Failure (CCF) often suffer from **orthopnea**—difficulty breathing when lying flat. In a dental setting, if a patient begins to show signs of respiratory distress or cardiac decompensation, placing them in an **upright (sitting) position** is the most critical immediate intervention. This position uses gravity to reduce venous return (preload) to the heart and causes abdominal contents to shift downwards, allowing for maximum diaphragmatic excursion and improved lung expansion. This reduces pulmonary congestion and eases the work of breathing. **Analysis of Incorrect Options:** * **A. Trendelenburg position:** This involves placing the head lower than the feet. It is contraindicated in CCF as it increases venous return to the heart, potentially precipitating acute pulmonary edema. * **C. Reverse Trendelenburg position:** While the head is elevated, it is less effective than a fully upright sitting position for managing acute respiratory distress in a dental chair. * **D. Left lateral position:** This is typically used to prevent supine hypotensive syndrome in pregnant patients or to prevent aspiration; it does not specifically alleviate pulmonary congestion in heart failure. **High-Yield Clinical Pearls for NEET-PG:** * **Orthopnea & PND:** Paroxysmal Nocturnal Dyspnea (PND) and orthopnea are hallmark symptoms of left-sided heart failure. * **Dental Management:** For stable CCF patients, the "semi-supine" position is generally preferred during routine treatment to prevent orthopnea. * **Acute Pulmonary Edema:** If a patient develops acute pulmonary edema in the chair, the management protocol is **LMNOP**: **L**asix (Furosemide), **M**orphine (rarely used now), **N**itrates, **O**xygen, and **P**osition (Upright).

Q: A patient with non-valvular atrial fibrillation requires anticoagulation therapy. Which scoring system can be used to calculate the 1-year risk of developing a major bleed?

HAS-BLED. **Explanation:** The **HAS-BLED** score is the standard clinical tool used to estimate the **1-year risk of major bleeding** in patients with atrial fibrillation (AF) who are starting or are currently on anticoagulant therapy. A score of ≥3 indicates a "high risk" of bleeding, necessitating caution and regular clinical review rather than necessarily withholding anticoagulation. **Breakdown of Options:** * **HAS-BLED (Correct):** This acronym stands for **H**ypertension, **A**bnormal renal/liver function, **S**troke, **B**leeding history/predisposition, **L**abile INR, **E**lderly (>65 years), and **D**rugs/Alcohol. It specifically predicts bleeding risk. * **CHA2DS2-VASc:** This is used to estimate the **thromboembolic (stroke) risk** in patients with non-valvular AF [1]. It determines whether a patient *needs* anticoagulation, whereas HAS-BLED assesses the *safety* of that treatment. * **HEA:** This is not a standard scoring system for anticoagulation or bleeding risk in cardiology. * **NIHSS (National Institutes of Health Stroke Scale):** This is a tool used by healthcare providers to objectively quantify the **impairment caused by a stroke** (severity) in the acute setting. **High-Yield Clinical Pearls for NEET-PG:** * **Anticoagulation Threshold:** In AF, anticoagulation is generally recommended if the CHA2DS2-VASc score is **≥2 in men** or **≥3 in women** [1]. * **Modifiable Risk Factors:** The primary utility of HAS-BLED is to identify and correct modifiable bleeding risk factors (e.g., uncontrolled hypertension or NSAID use). * **Major Bleed Definition:** In these scores, a major bleed usually refers to intracranial hemorrhage, bleeding requiring hospitalization, or a hemoglobin drop >2 g/dL.

Q: Which of the following is NOT a major criterion for the Jones classification?

Erythema multiforme. ### Explanation The **Jones Criteria** are used to diagnose the first episode of **Acute Rheumatic Fever (ARF)**, a non-suppurative sequela of Group A *Streptococcus* (GAS) pharyngitis. The diagnosis requires evidence of a preceding GAS infection plus either two major criteria or one major and two minor criteria [1]. **Why Erythema Multiforme is the Correct Answer:** **Erythema multiforme** is a hypersensitivity reaction often triggered by infections (like Herpes Simplex) or medications; it is **not** associated with ARF. The major cutaneous manifestation of ARF is **Erythema marginatum**, which presents as evanescent, non-pruritic, pink rings with central clearing, primarily on the trunk. **Analysis of Incorrect Options (Major Criteria):** * **Carditis (A):** The most serious manifestation, often presenting as pancarditis (valvulitis, myocarditis, and pericarditis) [1]. * **Arthritis (B):** Specifically **Migratory Polyarthritis**, typically involving large joints (knees, ankles, elbows, wrists). * **Erythema marginatum (C):** A classic major dermatological criterion (as described above). **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Major Criteria (JONES):** **J**oints (Migratory Polyarthritis), **O** (Carditis - shaped like a heart), **N**odules (Subcutaneous), **E**rythema marginatum, **S**ydenham chorea. * **Minor Criteria:** Fever, Arthralgia, prolonged PR interval on ECG, and elevated inflammatory markers (ESR/CRP). * **Subcutaneous Nodules:** These are firm, painless, and typically found over bony prominences or tendons. * **Sydenham Chorea:** Also known as "St. Vitus' Dance," it may be the sole manifestation of ARF and has a long latent period [1]. * **Essential Requirement:** Evidence of preceding GAS infection (Positive throat culture, Rapid Antigen Test, or elevated ASO titer) is mandatory for diagnosis [1].

Q: Digoxin is contraindicated in which of the following conditions?

Viral myocarditis with heart failure. **Explanation:** The correct answer is **Viral myocarditis with heart failure**. **1. Why Viral Myocarditis is the Correct Answer:** In viral myocarditis, the myocardium is acutely inflamed and highly irritable. Digoxin works by inhibiting the Na+/K+ ATPase pump, which increases intracellular calcium. In an already inflamed heart, this excess calcium significantly lowers the threshold for arrhythmias. Patients with myocarditis are hypersensitive to the toxic effects of Digoxin, even at therapeutic doses, leading to a high risk of fatal ventricular arrhythmias. Therefore, it is generally avoided in the acute phase of myocarditis. **2. Analysis of Incorrect Options:** * **Atrial Fibrillation (AF) with Heart Failure:** This is a classic **indication** for Digoxin. It provides rate control by increasing vagal tone and slowing conduction through the AV node, while its positive inotropic effect helps manage heart failure. * **Small VSD/ASD with Heart Failure:** While the definitive treatment for symptomatic shunts is surgical or device closure, Digoxin can be used as part of medical management to control symptoms of congestive heart failure by improving myocardial contractility. It is not contraindicated. **3. Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Hypertrophic Obstructive Cardiomyopathy (HOCM) – as it increases outflow obstruction; Wolff-Parkinson-White (WPW) syndrome with AF – as it may shorten the refractory period of the accessory pathway; and Ventricular Tachycardia. * **Electrolyte Sensitivity:** Hypokalemia, hypomagnesemia, and hypercalcemia predispose to Digoxin toxicity. * **ECG Finding:** The most common ECG finding in toxicity is **Ventricular Bigeminy**, while the most characteristic/specific is **Atrial Tachycardia with AV block**. * **Reverse Tick Sign:** This refers to ST-segment depression (sagging) seen in patients on therapeutic doses, not necessarily toxicity.

Q: What is the first-line drug of choice for acute pulmonary edema?

Furosemide. **Explanation:** **Furosemide (Option A)** is the first-line drug of choice for acute pulmonary edema because it addresses the primary pathology: fluid overload and increased pulmonary capillary wedge pressure. It works via a dual mechanism [1]: 1. **Immediate Venodilation:** Within 5–15 minutes of IV administration, it increases venous capacitance, reducing preload and shifting fluid away from the lungs [2]. 2. **Diuresis:** It inhibits the Na-K-2Cl symporter in the thick ascending limb of the Loop of Henle, promoting the excretion of excess fluid [1]. **Analysis of Incorrect Options:** * **Morphine (Option B):** Previously a mainstay for its venodilatory and anxiolytic effects, it is no longer first-line. Recent guidelines (ESC/AHA) caution against its routine use as it is associated with increased rates of mechanical ventilation and ICU admissions. * **Aminophylline (Option C):** A phosphodiesterase inhibitor used historically for "cardiac asthma" to relieve bronchospasm. It is rarely used today due to its narrow therapeutic index and pro-arrhythmic potential. * **Oxygen (Option D):** While essential for patients with hypoxemia ($SpO_2 < 90\%$), it is a supportive measure rather than a definitive pharmacological treatment to resolve the underlying edema. **High-Yield Clinical Pearls for NEET-PG:** * **L-M-N-O-P Mnemonic:** The classic management sequence is **L**asix (Furosemide), **M**orphine (selective use), **N**itrates (to reduce preload/afterload), **O**xygen, and **P**ositioning (propped up). * **Nitroglycerin:** If the patient is hypertensive, IV Nitroglycerin is often the most effective co-intervention alongside Furosemide [2]. * **Nesiritide:** A recombinant B-type natriuretic peptide (BNP) that can be used in refractory cases for its vasodilatory and natriuretic effects [1].

Q: A 26-year-old asymptomatic woman is found to have arrhythmias and a systolic murmur associated with mid-systolic clicks. Which investigation would you use?

Echocardiography. **Explanation:** The clinical presentation of a young, asymptomatic female with **mid-systolic clicks** and a **late systolic murmur** is the classic diagnostic triad for **Mitral Valve Prolapse (MVP)**, also known as Barlow’s Syndrome [1]. 1. **Why Echocardiography is correct:** Echocardiography is the **gold standard** and the investigation of choice for diagnosing MVP. It allows for the visualization of the displacement of one or both mitral valve leaflets (usually >2 mm) into the left atrium during systole. It also assesses the severity of associated mitral regurgitation and ventricular function. 2. **Why other options are incorrect:** * **Electrophysiological testing:** While MVP is associated with arrhythmias (like PVCs or PACs), EP studies are invasive and reserved for complex rhythm disorders, not for the primary diagnosis of the underlying valvular structural defect. * **Technetium scan:** This is a nuclear medicine study used for myocardial perfusion or identifying infarcted tissue; it has no role in diagnosing valvular morphology. * **Angiography:** This is an invasive procedure primarily used to visualize coronary arteries or quantify regurgitation before surgery. It is not a first-line diagnostic tool for MVP. **High-Yield Clinical Pearls for NEET-PG:** * **MVP Association:** Frequently associated with connective tissue disorders like **Marfan Syndrome** and Ehlers-Danlos Syndrome. * **Auscultation Dynamics:** The murmur and click in MVP occur **earlier** with maneuvers that decrease preload (e.g., standing, Valsalva) and **later** with maneuvers that increase preload (e.g., squatting). * **Most common cause:** Myxomatous degeneration of the mitral valve leaflets [1].

Question 1

A young male with acute myeloid leukemia was treated with induction chemotherapy. Two months later, he presents with bilateral pedal edema and dyspnea on exertion, as well as paroxysmal nocturnal dyspnea. Which of the following is the most likely cause of his current symptoms?

Accepted Answer

Dilated cardiomyopathy

Answer

Restrictive cardiomyopathy

Answer

Hypertrophic cardiomyopathy

Answer

Pericardial fibrosis

Question 2

Which of the following is not an indicator of chronic congestive heart failure?

Accepted Answer

Siuin

Answer

CRP

Answer

Brain natriuretic peptide

Answer

Troponin

Question 3

Pseudo-P-Pulmonale is typically seen in which electrolyte imbalance?

Accepted Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypocalcemia

Answer

Hypercalcemia

Question 4

During dental treatment in a patient with a previous history of congestive cardiac failure, what is the preferable patient position if they show signs and symptoms?

Accepted Answer

Upright position

Answer

Trendelenburg position

Answer

Reverse Trendelenburg position

Answer

Left lateral position

Question 5

A 60-year-old male patient is receiving aspirin, atorvastatin, isosorbide mononitrate, and a beta-blocker for chronic stable angina. He presents to the ER with episodes of unusually severe and long-lasting anginal chest pain each day over the past 3 days. His ECG and cardiac enzymes are normal. Which of the following is the best course of action?

Accepted Answer

Admit the patient and begin low-molecular-weight heparin and clopidogrel

Answer

Admit the patient and add intravenous digoxin

Answer

Admit the patient for thrombolytic therapy

Answer

Admit the patient for observation with no change in medication

Question 6

A patient with non-valvular atrial fibrillation requires anticoagulation therapy. Which scoring system can be used to calculate the 1-year risk of developing a major bleed?

Accepted Answer

HAS-BLED

Answer

HEA

Answer

CHADS2-Vasc

Answer

NIHSS

Question 7

Which of the following is NOT a major criterion for the Jones classification?

Accepted Answer

Erythema multiforme

Answer

Carditis

Answer

Arthritis

Answer

Erythema marginatum

Question 8

Digoxin is contraindicated in which of the following conditions?

Accepted Answer

Viral myocarditis with heart failure

Answer

Small Ventricular Septal Defect (VSD) with heart failure

Answer

Atrial fibrillation with heart failure

Answer

Small Atrial Septal Defect (ASD) with heart failure

Question 9

What is the first-line drug of choice for acute pulmonary edema?

Accepted Answer

Furosemide

Answer

Morphine

Answer

Aminophylline

Answer

Oxygen

Question 10

A 26-year-old asymptomatic woman is found to have arrhythmias and a systolic murmur associated with mid-systolic clicks. Which investigation would you use?

Accepted Answer

Echocardiography

Answer

Electrophysiological testing

Answer

Technetium scan

Answer

Angiography

Cardiology — MCQs

Cardiology — MCQs

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