Cardiology Practice Questions

Q: Which is the most common primary malignancy of the heart?

Myxoma. The correct answer is B. Myxoma. Understanding the Concept: Primary tumors of the heart are rare, as most cardiac malignancies are metastatic (secondary). Among primary cardiac tumors, approximately 75% are benign, and Myxoma is the most common overall primary cardiac neoplasm in adults. While the question asks for "malignancy," in the context of NEET-PG and standard medical examinations, "Myxoma" is the established answer for the most common primary cardiac neoplasm. It typically arises in the left atrium (75-80%) near the fossa ovalis. Analysis of Options: * A. Rhabdomyosarcoma: This is the most common primary malignant cardiac tumor in children, but it is less common than myxomas in adults. (Note: Angiosarcoma is the most common primary malignant tumor in adults). * C. Fibroma: This is a benign connective tissue tumor, more commonly seen in the pediatric population, often associated with Gorlin syndrome. * D. Lymphoma: Primary cardiac lymphoma is extremely rare and usually occurs in immunocompromised patients. High-Yield Clinical Pearls for NEET-PG: * Triad of Myxoma: Constitutional symptoms (fever, weight loss due to IL-6 production), Embolic phenomena (systemic emboli), and Obstructive symptoms (mimicking mitral stenosis). * Auscultatory Finding: A characteristic "Tumor Plop" (a low-pitched sound heard during early or mid-diastole as the tumor drops into the mitral orifice). * Most Common Primary Cardiac Tumor in Children: Rhabdomyoma (强烈 associated with Tuberous Sclerosis). * Most Common Cardiac Tumor Overall: Metastatic tumors (most commonly from Lung, Breast, or Melanoma).

Q: A 50-year-old female presents to the OPD with shortness of breath. On examination, she is hypotensive, has soft heart sounds, and elevated JVP. Her ECG shows a reduction in the amplitude of QRS complexes. Which of the following is the investigation of choice for diagnosing her condition?

2-D Echocardiography. ### Explanation **Diagnosis: Cardiac Tamponade** The clinical presentation describes **Beck’s Triad** (hypotension, muffled/soft heart sounds, and elevated JVP), which is the classic hallmark of cardiac tamponade. The ECG finding of **low voltage QRS complexes** [1] (and potentially electrical alternans) further supports the presence of a large pericardial effusion causing tamponade. **1. Why 2-D Echocardiography is the Correct Answer:** 2-D Echocardiography is the **investigation of choice** because it is rapid, non-invasive, and highly sensitive [1]. It can visualize the "swinging heart" within the pericardial fluid and identify critical diagnostic signs of tamponade, such as: * **Early diastolic collapse of the Right Ventricle (RV).** * **Late diastolic collapse of the Right Atrium (RA).** * Significant respiratory variation in transvalvular flows. **2. Why Other Options are Incorrect:** * **Ultrasonography (USG):** While "Focused Assessment with Sonography for Trauma" (FAST) can detect fluid, 2-D Echo is the specific gold standard for cardiac structural and hemodynamic assessment. * **PET Scan:** This is used for metabolic activity (e.g., oncology or myocardial viability) and has no role in the acute diagnosis of tamponade. * **M-mode Echocardiography:** While M-mode provides high temporal resolution to see the timing of wall collapse, it lacks the spatial context of 2-D imaging required for a comprehensive diagnosis. It is usually an adjunct to 2-D Echo, not the primary choice. **Clinical Pearls for NEET-PG:** * **Pulsus Paradoxus:** A key clinical sign (drop in systolic BP >10 mmHg during inspiration). * **ECG Finding:** **Electrical Alternans** (alternating QRS amplitude) is pathognomonic for large effusions [1]. * **Management:** The definitive treatment for cardiac tamponade is **urgent pericardiocentesis** [1]. * **Chest X-ray:** May show a "Water bottle" or "Money bag" heart appearance.

Q: An electrocardiogram (ECG) in a patient with a systolic ejection murmur that shows an incomplete bundle branch block in the precordial lead is most consistent with which of the following conditions?

A secundum atrial septal defect (ASD).. The clinical presentation of a **systolic ejection murmur** (due to increased flow across the pulmonary valve) combined with an **incomplete right bundle branch block (RBBB)** in the precordial leads (rsR' pattern in V1) is the classic hallmark of an **Atrial Septal Defect (ASD)** [1]. **1. Why Option A is Correct:** In an **Ostium Secundum ASD** (the most common type), the volume overload of the right ventricle causes a delay in depolarization, manifesting as an incomplete RBBB [1]. Crucially, the ECG in Secundum ASD typically shows **Right Axis Deviation (RAD)**. This distinguishes it from other types of ASDs. **2. Why the Other Options are Incorrect:** * **Option C & D:** Both **Ostium Primum ASD** and **Complete AV Canal Defects** also present with an incomplete RBBB; however, they are characteristically associated with **Left Axis Deviation (LAD)** due to the superior displacement of the AV node and conduction system. * **Option B:** A **Sinus Venosus ASD** is often associated with a **leftward shift of the P-wave axis** (inverted P waves in inferior leads) because the sinoatrial node is often displaced or dysfunctional, but it does not typically present with the classic isolated incomplete RBBB/RAD pattern of a Secundum ASD. **3. High-Yield Clinical Pearls for NEET-PG:** * **Auscultation:** Look for a **fixed, wide split S2**—this is the most diagnostic physical sign of an ASD. * **ECG Shortcut:** * ASD + Right Axis Deviation = **Secundum ASD**. * ASD + Left Axis Deviation = **Primum ASD**. * **Radiology:** Chest X-ray typically shows "hilar dance" (increased pulmonary plethora) and right-sided heart enlargement [2]. * **Most Common Type:** Secundum ASD (75% of cases), located in the region of the fossa ovalis [1].

Q: Severity of mitral stenosis is determined by which of the following?

Diastolic murmur duration. In Mitral Stenosis (MS), the severity is primarily determined by the **duration of the diastolic murmur**, not its intensity. ### Why the Correct Answer is Right The hallmark of MS is a mid-diastolic rumbling murmur. As the mitral valve orifice narrows, the pressure gradient between the left atrium (LA) and left ventricle (LV) takes longer to equalize. In severe MS, the LA pressure remains significantly higher than the LV pressure throughout the entire diastole. Therefore, the **longer the duration** of the murmur (i.e., the closer it extends toward the first heart sound, S1), the more severe the stenosis. ### Why the Other Options are Incorrect * **Intensity of S1:** While S1 is loud in mild-to-moderate MS due to the mobile leaflets snapping shut, it actually becomes **soft or absent** in severe, calcified MS. Thus, intensity does not linearly correlate with severity. * **Opening Snap (OS):** The presence of an OS indicates mobile leaflets. However, severity is determined by the **A2-OS interval**, not the mere presence of the snap. A shorter A2-OS interval indicates higher LA pressure and more severe MS. * **Intensity of Diastolic Murmur:** The loudness of a murmur depends on the flow rate and pressure gradient. In very severe MS with low cardiac output, the murmur may actually become very soft ("Silent MS"). ### NEET-PG High-Yield Pearls * **Best indicator of MS severity:** Length of the diastolic murmur. * **A2-OS Interval:** Inversely proportional to severity (Shorter interval = Higher LA pressure = More severe MS). * **Loud S1 and OS:** Suggest the valve is still pliable and potentially suitable for Balloon Mitral Valvotomy (BMV). * **Critical MS:** Defined as a Mitral Valve Area (MVA) **< 1.0 cm²**.

Q: In Mitral Valve Prolapse (MVP), which of the following conditions would cause the ejection click to be more accentuated and the murmur to move closer to the first heart sound?

Marked anxiety. **Explanation** The timing of the mid-systolic click and late systolic murmur in **Mitral Valve Prolapse (MVP)** is determined by the **Left Ventricular (LV) volume**. Any maneuver that **decreases LV volume** (decreased preload or decreased afterload) causes the redundant mitral valve leaflets to prolapse earlier into the left atrium during systole [1]. This results in the click and murmur moving **closer to the first heart sound (S1)**. **1. Why Marked Anxiety is Correct:** Anxiety leads to increased sympathetic activity (tachycardia) and decreased systemic vascular resistance. Tachycardia reduces diastolic filling time, thereby **decreasing LV end-diastolic volume**. This causes the valve to reach its prolapse point earlier in systole, making the click and murmur occur sooner (closer to S1) and often louder. **2. Why the Incorrect Options are Wrong:** * **Pregnancy & Passive Leg Lifting:** Both these conditions **increase venous return (preload)**. Increased LV volume distends the ventricle, delaying the prolapse of the leaflets. This moves the click and murmur **further from S1** (closer to S2). * **Beta-blockers:** These drugs decrease heart rate and increase diastolic filling time, thereby **increasing LV volume**. Similar to leg lifting, this delays the onset of the murmur and click. **Clinical Pearls for NEET-PG:** * **The Rule of Volume:** In MVP and HOCM, maneuvers that **decrease** LV volume (Standing, Valsalva Strain) make the murmur **louder/earlier**. Maneuvers that **increase** LV volume (Squatting, Leg Raise) make the murmur **softer/later**. * **Handgrip:** Increases afterload, which increases LV volume [2], thus delaying the murmur in MVP (unlike Mitral Regurgitation, where it gets louder). * **MVP Association:** Often associated with connective tissue disorders like Marfan Syndrome and Ehlers-Danlos Syndrome.

Q: Which of the following findings is shown in the chest leads?

Myocardial ischemia. ***Myocardial ischemia*** - Presents with **ST depression** and **T-wave inversions** in chest leads, indicating inadequate oxygen supply to myocardium. - Often seen during **stress testing** or **unstable angina**, representing reversible myocardial changes without necrosis. *Myocardial injury* - Characterized by **ST elevation** in chest leads, indicating more severe myocardial damage than ischemia. - Represents acute injury with potential for **myocardial necrosis** if not promptly treated. *Digoxin* - Shows characteristic **"reverse-tick" or "scooped" ST depression** in multiple leads, not specific to chest leads. - Associated with **shortened QT interval** and represents therapeutic digoxin effect, not pathological ischemia. *Digoxin toxicity* - Manifests primarily as **cardiac arrhythmias** like **atrial tachycardia with AV block** or **ventricular ectopy**. - ECG shows **increased automaticity** and **conduction blocks** rather than ischemic changes in chest leads.

Q: Subvalvular aortic stenosis is known to be associated with all of the following, except:

Tricuspid valve atresia. Subvalvular Aortic Stenosis (SAS) is a form of left ventricular outflow tract (LVOT) obstruction, most commonly caused by a discrete fibrous membrane or a fibromuscular tunnel. **Why Tricuspid Atresia is the Correct Answer:** Tricuspid Atresia is a cyanotic congenital heart disease characterized by the absence of the tricuspid valve. It is typically associated with a **hypoplastic right ventricle** and an atrial septal defect. It is **not** associated with subvalvular aortic stenosis. In fact, in cases of Tricuspid Atresia with transposed great arteries, the concern is often *subpulmonary* stenosis, not subaortic. **Analysis of Incorrect Options:** * **Aortic Regurgitation (AR):** This is a very common complication of SAS (seen in ~50-80% of cases). The high-velocity jet from the subvalvular obstruction causes "jet lesions" and chronic trauma to the aortic valve leaflets, leading to thickening and secondary AR. * **Coarctation of Aorta:** SAS is frequently part of a spectrum of left-sided obstructive lesions. It is often associated with Coarctation of the aorta and Shone’s complex (a series of left-sided obstructions). * **Ventricular Septal Defect (VSD):** SAS is frequently associated with other congenital anomalies, most notably VSD [1]. The altered hemodynamics of a VSD can sometimes trigger the proliferation of fibrous tissue in the LVOT. **NEET-PG High-Yield Pearls:** * **Shone’s Complex:** Includes parachute mitral valve, supravalvular mitral ring, subaortic stenosis, and coarctation of aorta. * **Clinical Feature:** Unlike valvular AS, the murmur of SAS is often heard best at the left sternal border, and an **expiratory click is typically absent**. * **Progression:** SAS is often progressive; even if the gradient is mild at birth, it tends to increase over time, necessitating serial echocardiography.

Question 1

Which is the most common primary malignancy of the heart?

Accepted Answer

Myxoma

Answer

Rhabdomyosarcoma

Answer

Fibroma

Answer

Lymphoma

Question 2

What is the commonest valvular manifestation of acute as well as previous rheumatic carditis?

Accepted Answer

Mitral regurgitation

Answer

Mitral stenosis

Answer

Aortic stenosis

Answer

Aortic regurgitation

Question 3

A pulse deficit greater than 10 is most commonly seen in which of the following conditions?

Accepted Answer

Atrial fibrillation

Answer

Ventricular premature contraction

Answer

Atrial flutter

Answer

Ventricular fibrillation

Question 4

A 50-year-old female presents to the OPD with shortness of breath. On examination, she is hypotensive, has soft heart sounds, and elevated JVP. Her ECG shows a reduction in the amplitude of QRS complexes. Which of the following is the investigation of choice for diagnosing her condition?

Accepted Answer

2-D Echocardiography

Answer

Ultrasonography (USG)

Answer

Positron Emission Tomography (PET)

Answer

M-mode Echocardiography

Question 5

An electrocardiogram (ECG) in a patient with a systolic ejection murmur that shows an incomplete bundle branch block in the precordial lead is most consistent with which of the following conditions?

Accepted Answer

A secundum atrial septal defect (ASD).

Answer

A sinus venosus ASD with partial anomalous pulmonary venous return (PAPVR).

Answer

An ostium primum atrial septal defect (ASD).

Answer

A complete atrioventricular canal defect.

Question 6

Severity of mitral stenosis is determined by which of the following?

Accepted Answer

Diastolic murmur duration

Answer

Intensity of S1 heart sound

Answer

Opening snap

Answer

Intensity of diastolic murmur

Question 7

A 67-year-old man with an 18-year history of type 2 diabetes mellitus presents for a routine physical examination. His temperature is 36.9 C (98.5 F), his blood pressure is 158/98 mm Hg and his pulse is 82/minute and regular. On examination, the physician notes a non tender, pulsatile, mass in the mid-abdomen. A plain abdominal x-ray film with the patient in the lateral position reveals spotty calcification of a markedly dilated abdominal aortic wall. Following surgery, the patient is placed on a low-fat diet to reduce the risk of continued progression of his atherosclerotic disease. A bile acid sequestrant is added to interrupt enterohepatic circulation of bile acids. Which of the following agents was MOST likely prescribed?

Accepted Answer

Cholestyramine

Answer

Atorvastatin

Answer

Clofibrate

Answer

Gemfibrozil

Question 8

In Mitral Valve Prolapse (MVP), which of the following conditions would cause the ejection click to be more accentuated and the murmur to move closer to the first heart sound?

Accepted Answer

Marked anxiety

Answer

Pregnancy

Answer

Passive leg lifting in the supine position

Answer

Administration of a beta-blocker

Question 9

Which of the following findings is shown in the chest leads?

Accepted Answer

Myocardial ischemia

Answer

Myocardial injury

Answer

Digoxin

Answer

Digoxin toxicity

Question 10

Subvalvular aortic stenosis is known to be associated with all of the following, except:

Accepted Answer

Tricuspid valve atresia

Answer

Aortic regurgitation

Answer

Coarctation of aorta

Answer

Ventricular septal defect

Cardiology — MCQs

Cardiology — MCQs

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