Cardiology Practice Questions

Q: QT prolongation is seen in all of the following conditions except?

Digitalis toxicity. The correct answer is **Digitalis toxicity**. In clinical practice and for NEET-PG, it is crucial to distinguish between drugs that prolong the QT interval and those that shorten it. **1. Why Digitalis Toxicity is the correct answer:** Digitalis (Digoxin) acts by inhibiting the Na+/K+ ATPase pump. Its characteristic effect on the EKG is **shortening of the QT interval**. Other classic digitalis effects include the "reverse tick" or "scooped-out" ST-segment depression and T-wave inversion. Therefore, it does not cause QT prolongation. **2. Analysis of incorrect options (Conditions that DO prolong QT):** * **Hypokalemia:** Low potassium levels lead to delayed repolarization, which manifests as a prominent U-wave and an apparent prolongation of the QT interval (often called the QU interval). [2, 3] * **Hypocalcemia:** Calcium is responsible for the plateau phase (Phase 2) of the cardiac action potential. Low calcium levels prolong this phase, leading to a lengthened ST segment and a prolonged QT interval. (Note: Hypercalcemia shortens the QT). * **Jervell and Lange-Nielsen Syndrome:** This is a congenital long QT syndrome (LQTS) inherited in an autosomal recessive pattern. It is characterized by a very long QT interval and associated sensorineural deafness. **Clinical Pearls for NEET-PG:** * **Mnemonic for QT Prolongation:** "The **ABCDE** of QT prolongation" – **A**ntiarrhythmics (Class IA, III), **B**iotics (Macrolides, Quinolones), **C**ychotics (Haloperidol), **D**epressants (TCAs), and **E**lectrolytes (Hypo-K, Hypo-Mg, Hypo-Ca). * **Complication:** The most feared complication of a prolonged QT interval is **Torsades de Pointes**, a polymorphic ventricular tachycardia. [1] * **Romano-Ward Syndrome:** Another congenital LQTS, but it is autosomal dominant and lacks deafness.

Q: Automated external defibrillators are used for which cardiac rhythm?

Ventricular fibrillation. **Explanation:** Automated External Defibrillators (AEDs) are portable electronic devices designed to treat life-threatening cardiac arrhythmias that lead to sudden cardiac arrest [1]. **Why Ventricular Fibrillation (VF) is Correct:** The primary function of a defibrillator is to deliver a high-energy electrical shock to the heart. This shock simultaneously depolarizes the entire myocardium, momentarily stopping all electrical activity. This "reset" allows the heart’s natural pacemaker (the SA node) to re-establish a functional, organized rhythm. AEDs are specifically programmed to recognize two "shockable" rhythms: 1. **Ventricular Fibrillation (VF):** Disorganized electrical activity with no effective ventricular contraction [2]. 2. **Pulseless Ventricular Tachycardia (pVT):** Rapid, organized ventricular rhythm that fails to produce a pulse [1]. **Why Other Options are Incorrect:** * **Atrial Fibrillation (AF) and Atrial Flutter:** These are supraventricular arrhythmias. While they can be treated with "cardioversion" (synchronized shocks), they are not immediately life-threatening in the context of sudden cardiac arrest [3]. AEDs are designed to ignore these rhythms to prevent unnecessary shocks. * **Supraventricular Tachycardia (SVT):** This is an organized rhythm originating above the ventricles. It requires synchronized cardioversion or pharmacological intervention (e.g., Adenosine), not the unsynchronized high-energy shock provided by an AED. **High-Yield Clinical Pearls for NEET-PG:** * **Non-Shockable Rhythms:** Asystole and Pulseless Electrical Activity (PEA) are **not** shockable [1]. The management for these is high-quality CPR and Epinephrine. * **Time is Tissue:** For every minute defibrillation is delayed, the probability of survival declines by 7–10% [1]. * **Safety:** Always ensure "All Clear" before delivering a shock to prevent accidental provider injury.

Q: What does displacement of the cardiac apex towards the left and downwards indicate?

Left ventricular hypertrophy. ### Explanation The cardiac apex (apex beat) is normally located in the **left 5th intercostal space**, just medial to the midclavicular line. Its position and character are vital clinical indicators of cardiac chamber size and function. **1. Why Left Ventricular Hypertrophy (LVH) is correct:** In LVH, particularly when associated with **ventricular dilatation** (volume overload), the left ventricle expands both laterally and inferiorly [1]. Because the left ventricle forms the anatomical apex of the heart, its enlargement pushes the apex beat **downwards (to the 6th or 7th intercostal space) and laterally (left of the midclavicular line)** [1]. This is often described as a "heaving" or "sustained" apex beat in NEET-PG questions [1]. **2. Why the other options are incorrect:** * **Right Ventricular Hypertrophy (RVH):** RVH typically causes a **left parasternal heave** [1]. While it may displace the apex beat laterally by pushing the LV backward, it does **not** displace it downwards; in some cases of RV dilatation, it may even displace the apex upwards [2]. * **Right Atrial Hypertrophy (RAH):** RAH does not significantly alter the position of the apex beat; it is usually identified on ECG (P-pulmonale) or by a prominent 'a' wave in the JVP. * **Left Atrial Hypertrophy (LAH):** LAH (often seen in mitral stenosis) does not displace the apex. In fact, in pure mitral stenosis with LAH, the apex beat remains in its normal position but may become "tapping" in quality [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Tapping Apex:** Suggests Mitral Stenosis (palpable S1) [1]. * **Heaving/Sustained Apex:** Suggests Pressure Overload (e.g., Aortic Stenosis, Hypertension) [1]. * **Hyperdynamic/Ill-sustained Apex:** Suggests Volume Overload (e.g., Mitral Regurgitation, Aortic Regurgitation) [1]. * **Double Apical Impulse:** Characteristic of Hypertrophic Obstructive Cardiomyopathy (HOCM).

Q: What is the most common cause of a mycotic aneurysm?

Staphylococcus aureus. **Explanation:** A **mycotic aneurysm** is a misnomer; it refers to an infected arterial wall leading to a localized dilation, regardless of whether the pathogen is fungal or bacterial. These typically arise from hematogenous seeding (often due to infective endocarditis), direct extension from a nearby infection, or trauma [2]. **1. Why Staphylococcus aureus is correct:** *Staphylococcus aureus* is the **most common** causative organism overall [3]. Its high virulence allows it to easily adhere to and destroy the arterial wall, especially in the setting of intravenous drug use (IVDU) or bacteremia [2], [3]. *Salmonella* species are the second most common cause, particularly in patients with pre-existing atherosclerotic plaques. **2. Analysis of Incorrect Options:** * **Candida albicans:** While "mycotic" implies a fungal origin, true fungal causes are rare. They typically occur in severely immunocompromised patients or as a complication of cardiac surgery. * **Treponema pallidum:** This causes **Syphilitic (Luetic) Aneurysms**, which primarily involve the ascending aorta (obliterative endarteritis of the vasa vorum). It is a chronic inflammatory process, not an acute "mycotic" infection. * **Pseudomonas aeruginosa:** This is a common cause in specific subsets, such as IVDU or post-surgical infections, but it does not surpass the incidence of *S. aureus*. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** The femoral artery (due to IVDU) or the abdominal aorta. * **Most common cause of Syphilitic Aneurysm:** *Treponema pallidum* (affects the ascending aorta). * **Most common cause of Abdominal Aortic Aneurysm (AAA):** Atherosclerosis [1]. * **Classic Presentation:** A painful, pulsatile mass associated with fever and leukocytosis. * **Gold Standard Diagnosis:** CT Angiography.

Q: All of the following are features seen in cardiac tamponade, EXCEPT:

Rapid y descent. In cardiac tamponade, the heart is compressed by fluid within the pericardial space, leading to an equalization of diastolic pressures in all four cardiac chambers [1]. ### Why "Rapid y descent" is the correct answer: The **'y' descent** in the Jugular Venous Pulse (JVP) represents the opening of the tricuspid valve and the rapid filling of the right ventricle from the right atrium. In cardiac tamponade, the high intrapericardial pressure is transmitted to the heart throughout the cardiac cycle. This prevents rapid ventricular filling during early diastole. Consequently, the **'y' descent is either absent or blunted**. *Note: A "rapid/prominent y descent" is a hallmark of Constrictive Pericarditis (Friedreich’s sign), not tamponade.* [2] ### Explanation of other options: * **A. Raised JVP:** This is a classic finding (part of Beck’s Triad) due to the heart's inability to accommodate venous return because of external compression. * **B. Pericardial effusion:** Tamponade is a clinical diagnosis resulting from the accumulation of fluid (effusion) that increases intrapericardial pressure [1]. * **D. Pulsus paradoxus:** Defined as an inspiratory drop in systolic BP >10 mmHg. It occurs due to exaggerated ventricular interdependence (the septum shifts toward the left ventricle during inspiration). ### High-Yield Clinical Pearls for NEET-PG: * **Beck’s Triad:** Hypotension, Raised JVP, and Muffled Heart Sounds. * **JVP Pattern:** In Tamponade, you see a **prominent 'x' descent** but an **absent/blunted 'y' descent**. * **ECG Findings:** Low voltage complexes and **Electrical Alternans** (swinging heart) [1]. * **Treatment:** Immediate ultrasound-guided pericardiocentesis [1].

Q: What is the recommended number of drugs and diuretics for managing resistant hypertension when the goal is not achieved?

Three drugs plus diuretics. **Explanation:** **Resistant Hypertension (RH)** is defined as blood pressure that remains above goal despite the concurrent use of **three antihypertensive drug classes**, commonly including a Long-acting Calcium Channel Blocker (CCB), an ACE inhibitor or ARB, and a **Diuretic** [1]. All drugs must be administered at maximum tolerated doses. 1. **Why Option C is Correct:** According to the AHA/ACC and ESC guidelines, the standard definition of resistant hypertension involves a three-drug regimen. If the target BP is not achieved with these three agents (which must include a diuretic), the next step in management is the addition of a **fourth drug**, typically a Mineralocorticoid Receptor Antagonist (MRA) like Spironolactone [1]. Therefore, the condition itself is defined by the failure of **three drugs plus a diuretic** (or the requirement of four or more drugs to achieve control) [1]. 2. **Why Other Options are Incorrect:** * **Option B (Two drugs):** This is considered "uncontrolled hypertension" but does not meet the criteria for "resistant," as many patients require a triple-drug combination for initial control. * **Options A & D (Four/Five drugs):** These represent the *treatment* phase of resistant hypertension. If a patient requires four or more drugs to reach their goal, they are categorized as having "controlled resistant hypertension." **High-Yield Clinical Pearls for NEET-PG:** * **Pseudo-resistance:** Always rule out "White coat hypertension" or non-compliance before diagnosing RH [1]. * **Drug of Choice (4th line):** **Spironolactone** is the most effective add-on drug for resistant hypertension (PATHWAY-2 trial). * **Commonest Secondary Cause:** Primary Aldosteronism and Obstructive Sleep Adea (OSA) are frequently implicated in resistant cases. * **Chlorthalidone/Indapamide:** These are preferred over Hydrochlorothiazide in RH due to their longer half-life and superior potency.

Q: Which of the following is not seen in Mitral Valve Prolapse (MVP)?

Defect in type IV collagen. Mitral Valve Prolapse (MVP), also known as Barlow’s syndrome, is characterized by the displacement of an abnormally thickened mitral valve leaflet into the left atrium during systole. [1] **1. Why Option D is the Correct Answer:** The underlying pathology in MVP is **myxomatous degeneration** of the valve leaflets. This is associated with a defect in **Type I and Type III collagen**, not Type IV. Type IV collagen is primarily found in basement membranes (e.g., Alport syndrome). In MVP, there is an accumulation of dermatan sulfate and a fragmentation of collagen fibers within the *stratum spongiosa* of the valve, leading to its characteristic "floppy" nature. **2. Analysis of Incorrect Options:** * **A. Transient Ischemic Attack (TIA):** MVP is a recognized risk factor for systemic embolization. Fibrin-platelet microemboli can form on the damaged surface of the prolapsing leaflets, leading to TIAs or strokes. * **B. Infective Endocarditis (IE):** The structural abnormality and resultant mitral regurgitation create turbulent blood flow, which predisposes the valve to bacterial seeding. * **C. Premature Ventricular Contractions (PVCs):** Arrhythmias are common in MVP. Patients often present with palpitations due to PVCs or paroxysmal supraventricular tachycardias, likely due to the stretching of papillary muscles. **Clinical Pearls for NEET-PG:** * **Auscultation:** Characterized by a **Mid-systolic click** followed by a **Late systolic murmur**. [1] * **Dynamic Auscultation:** Maneuvers that decrease preload (Standing, Valsalva) make the click/murmur occur **earlier** and louder. * **Associations:** Strongly associated with connective tissue disorders like **Marfan syndrome** and **Ehlers-Danlos syndrome**. * **Most Common Cause:** MVP is the most common cause of isolated mitral regurgitation in developed countries.

Question 1

QT prolongation is seen in all of the following conditions except?

Accepted Answer

Digitalis toxicity

Answer

Hypokalemia

Answer

Hypocalcemia

Answer

Jervell syndrome

Question 2

A pacemaker is indicated in which of the following conditions?

Accepted Answer

Sick sinus syndrome

Answer

Acute myocardial infarction with first-degree atrioventricular block

Answer

Acute myocardial infarction with fascicular block

Question 3

Automated external defibrillators are used for which cardiac rhythm?

Accepted Answer

Ventricular fibrillation

Answer

Atrial fibrillation

Answer

Atrial flutter

Answer

Supraventricular tachycardia

Question 4

What does displacement of the cardiac apex towards the left and downwards indicate?

Accepted Answer

Left ventricular hypertrophy

Answer

Right ventricular hypertrophy

Answer

Right atrial hypertrophy

Answer

Left atrial hypertrophy

Question 5

A 40-year-old male presents with headache and convulsions. His blood pressure is 210/140 mm Hg. Fundus examination reveals papilledema. Which one of the following drug combinations is suitable for this patient?

Accepted Answer

Nitroprusside + Furosemide

Answer

Diazoxide + Triamterene

Answer

Nitroprusside + Triamterene

Answer

None of the above

Question 6

What is the most common cause of a mycotic aneurysm?

Accepted Answer

Staphylococcus aureus

Answer

Candida albicans

Answer

Treponema pallidum

Answer

Pseudomonas aeruginosa

Question 7

All of the following are features seen in cardiac tamponade, EXCEPT:

Accepted Answer

Rapid y descent

Answer

Raised JVP

Answer

Pericardial effusion

Answer

Pulsus paradoxus

Question 8

What is the recommended number of drugs and diuretics for managing resistant hypertension when the goal is not achieved?

Accepted Answer

Three drugs plus diuretics

Answer

Four drugs plus diuretics

Answer

Two drugs plus diuretics

Answer

Five drugs plus diuretics

Question 9

Which of the following is not seen in Mitral Valve Prolapse (MVP)?

Accepted Answer

Defect in type IV collagen

Answer

Transient ischemic attack

Answer

Infective endocarditis

Answer

Premature ventricular contractions

Question 10

What is the most common cause of aortic dissection?

Accepted Answer

Hypertension

Answer

Syphilis

Answer

Marfan syndrome

Answer

Cystic medial necrosis

Cardiology — MCQs

Cardiology — MCQs

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