Cardiology Practice Questions

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].

Q: What is true about the third heart sound (S3)?

Heard in mitral regurgitation. **Explanation:** The **third heart sound (S3)**, also known as a ventricular gallop, occurs during the **early phase of diastole** (rapid ventricular filling phase) [2]. It is caused by the sudden deceleration of blood flow into a dilated or non-compliant left ventricle. **1. Why Option A is Correct:** In **Mitral Regurgitation (MR)**, there is a volume overload of the left ventricle. During diastole, the ventricle receives both the normal venous return and the regurgitated volume from the previous systole. This massive influx of blood into a dilated ventricle creates the S3 [4]. It is a hallmark of volume overload states and heart failure. **2. Why the Other Options are Incorrect:** * **Option B:** S3 is a **diastolic sound**, occurring just after S2. Systolic sounds include S1 and ejection clicks [3]. * **Option C:** S3 is a **low-pitched sound** (thud-like) [1]. It is best heard with the **bell** of the stethoscope at the apex in the left lateral decubitus position [1]. High-pitched sounds (like S1, S2, or MR murmurs) are heard better with the diaphragm. * **Option D:** While S3 can be physiological in children, young adults (<40 years), and pregnant women, it is **pathological in older adults**, where it usually signifies congestive heart failure (CHF). **Clinical Pearls for NEET-PG:** * **S3 Sequence:** S1–S2–S3 (resembles the cadence of the word "Kentucky"). * **Most Common Cause:** Left ventricular failure (decreased EF). * **Differential Diagnosis:** S3 is also seen in high-output states like anemia, thyrotoxicosis, and pregnancy. * **S4 vs. S3:** S4 (atrial gallop) occurs in late diastole and is associated with **pressure overload** (e.g., Hypertension, Aortic Stenosis) and stiff ventricles.

Q: A 30-year-old female presented with eclampsia. After 3 hours of admission, she is complaining of palpitations for which an ECG was performed. Vitals are stable. What is the next best management?

Magnesium sulfate. ***Magnesium sulfate*** - **Torsades de Pointes (TdP)** is polymorphic ventricular tachycardia often seen in eclampsia due to **electrolyte disturbances**, and **IV magnesium sulfate** is the first-line treatment for hemodynamically stable patients. - Magnesium helps **stabilize cardiac membranes** and corrects the underlying **QT prolongation** that predisposes to TdP. *DC shock* - **DC cardioversion** is reserved for **hemodynamically unstable** patients with TdP or ventricular fibrillation. - Since the patient has **stable vitals**, electrical cardioversion is not the immediate first-line treatment. *Amiodarone* - **Prolongs QT interval** and can actually **worsen TdP** by further increasing the risk of polymorphic VT. - Contraindicated in **TdP management** as it may precipitate more arrhythmic episodes. *Adenosine* - Effective for **supraventricular tachycardia (SVT)** by blocking AV nodal conduction temporarily. - **Not effective for ventricular tachycardia** like TdP, as it does not address the underlying ventricular origin of the arrhythmia.

Question 1

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

Accepted Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypocalcemia

Answer

Hypercalcemia

Question 2

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 3

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 4

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 5

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 6

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 7

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

Accepted Answer

Furosemide

Answer

Morphine

Answer

Aminophylline

Answer

Oxygen

Question 8

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

Question 9

What is true about the third heart sound (S3)?

Accepted Answer

Heard in mitral regurgitation

Answer

A systolic sound

Answer

A high-pitched sound

Answer

Normal in adults

Question 10

A 30-year-old female presented with eclampsia. After 3 hours of admission, she is complaining of palpitations for which an ECG was performed. Vitals are stable. What is the next best management?

Accepted Answer

Magnesium sulfate

Answer

DC shock

Answer

Amiodarone

Answer

Adenosine

Cardiology — MCQs

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