Cardiology Practice Questions

Q: Atrial fibrillation is seen in all of the following conditions EXCEPT:

Ventricular septal defect. ### Explanation Atrial fibrillation (AF) is primarily driven by **atrial stretch, pressure overload, or inflammation** of the atrial myocardium [1]. **1. Why Ventricular Septal Defect (VSD) is the correct answer:** In VSD, the shunt occurs at the ventricular level. While it leads to left ventricular volume overload and potentially left atrial enlargement over time, the primary pathology involves the ventricles. Unlike atrial-level pathologies, VSD is **not** classically associated with atrial fibrillation. If an arrhythmia occurs in VSD, it is more commonly ventricular or related to conduction blocks. **2. Analysis of Incorrect Options:** * **Mitral Stenosis (MS):** This is the most common valvular cause of AF. Obstruction at the mitral valve leads to significant left atrial pressure overload, dilatation, and fibrosis, creating the perfect substrate for reentry circuits. * **Atrial Septal Defect (ASD):** AF is a common complication in adults with ASD (especially the secundum type) [2]. The left-to-right shunt causes chronic right atrial volume overload and enlargement, triggering supraventricular arrhythmias. * **Constrictive Pericarditis:** The fibrotic and calcified pericardium can involve the epicardium of the atria. This leads to atrial inflammation, elevated atrial pressures due to restricted filling, and subsequent AF in approximately 30% of cases. **Clinical Pearls for NEET-PG:** * **Most common cause of AF (Global):** Hypertension and Coronary Artery Disease. * **Most common valvular cause:** Mitral Stenosis. * **Holiday Heart Syndrome:** AF triggered by acute alcohol consumption. * **ECG Hallmark:** Irregularly irregular rhythm with absent P-waves and presence of f-waves [1]. * **Management Tip:** In VSD, the presence of AF should prompt a search for associated mitral valve disease or advanced heart failure.

Q: What TIMI score on angiography denotes complete occlusion of a coronary artery?

0. The **TIMI (Thrombolysis in Myocardial Infarction)** flow grade is a scoring system used during coronary angiography to assess the degree of blood flow through a coronary artery [1]. It is a critical prognostic indicator in patients with Acute Coronary Syndrome (ACS). ### Explanation of Options: * **TIMI 0 (Correct):** This represents **complete occlusion** of the coronary artery [3]. There is no flow beyond the point of obstruction. This is typically seen in the culprit vessel of an ST-elevation myocardial infarction (STEMI). * **TIMI 1:** This denotes **penetration without perfusion**. Contrast material passes beyond the area of obstruction but fails to opacify the entire distal coronary bed. * **TIMI 2:** This is **partial perfusion**. Contrast material opacifies the entire distal vessel, but the rate of entry and clearance is significantly slower than in a normal vessel. * **TIMI 3:** This represents **full perfusion** (normal flow) [3]. Contrast opacifies the distal vessel as rapidly as it does in a normal, non-obstructed artery. ### Clinical Pearls for NEET-PG: * **Goal of PCI:** The primary objective of Primary Percutaneous Coronary Intervention (PCI) is to restore **TIMI 3 flow** [3]. * **TIMI Risk Score:** Do not confuse the *TIMI Flow Grade* (angiographic) with the *TIMI Risk Score* (clinical). The Risk Score (0-7) predicts 14-day mortality in UA/NSTEMI based on parameters like age ≥65, ≥3 CAD risk factors, and ST-segment changes [2]. * **No-Reflow Phenomenon:** This occurs when a patient has TIMI 0-1 flow despite the mechanical opening of the epicardial artery, usually due to microvascular dysfunction or distal embolization.

Q: Which of the following auscultatory signs is absent in mitral stenosis when atrial fibrillation is present?

Presystolic accentuation. In **Mitral Stenosis (MS)**, the classic murmur is a low-pitched mid-diastolic rumble [1]. Toward the end of diastole, there is typically a **presystolic accentuation** of this murmur. This accentuation is caused by **atrial systole** (atrial kick), which increases the pressure gradient across the narrowed mitral valve, accelerating blood flow into the ventricle just before the mitral valve closes [1]. In **Atrial Fibrillation (AF)**, there is no coordinated atrial contraction. Since the "atrial kick" is lost, the terminal increase in blood flow across the valve disappears, leading to the **absence of presystolic accentuation**. **Analysis of Other Options:** * **Mid-diastolic murmur:** This is caused by the passive flow of blood across the stenosed valve during the early and mid-phases of diastole [1]. It persists in AF, though its duration may vary with cycle length. * **Variable first heart sound (S1):** In AF, the R-R interval is irregular. The intensity of S1 depends on the duration of diastole (the position of leaflets at the onset of ventricular systole). Therefore, a variable S1 is a *characteristic* finding of AF. * **Loud P2:** This indicates pulmonary hypertension secondary to MS [1]. It is a reflection of pulmonary artery pressure and is not dependent on the cardiac rhythm. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of AF":** Whenever a patient with MS develops AF, the presystolic accentuation disappears, and the S1 becomes variable in intensity. * **S1 in MS:** S1 is loud/tapping in MS because the leaflets are held wide open by high atrial pressure until the very start of systole [1]. If the valve is heavily calcified, S1 becomes soft. * **Opening Snap (OS):** The A2-OS interval is inversely proportional to the severity of MS (shorter interval = more severe MS) [2].

Q: Which of the following is NOT an X-ray feature of Atrial Septal Defect?

Left atrial enlargement. **Explanation:** In **Atrial Septal Defect (ASD)**, the underlying pathophysiology is a left-to-right shunt at the atrial level [2]. Because the pressure gradient between the atria is low and the mitral valve remains competent, the left atrium (LA) decompresses directly into the right atrium. Consequently, the LA does not undergo volume or pressure overload, making **Left Atrial Enlargement (LAE)** a characteristically absent feature in ASD. If LAE is present, one must suspect associated Mitral Regurgitation or Lutembacher Syndrome. **Analysis of Options:** * **Right Atrial Enlargement (Option A):** The shunted blood flows from the LA to the RA, leading to volume overload and subsequent enlargement of the RA [1] and Right Ventricle. * **Pulmonary Plethora (Option C):** Increased blood flow through the right heart is pumped into the pulmonary circulation, resulting in prominent pulmonary vascular markings (plethora) on X-ray [1]. * **Small Aortic Knuckle (Option D):** Due to the significant left-to-right shunt, the stroke volume entering the systemic circulation (left ventricle to aorta) is relatively reduced, making the aortic knuckle appear small or inconspicuous. **High-Yield Clinical Pearls for NEET-PG:** * **Lutembacher Syndrome:** The combination of ASD and acquired Mitral Stenosis (leads to significant LAE). * **ECG in ASD:** Look for RBBB (Right Bundle Branch Block) and Right Axis Deviation (ostium secundum) [2] or Left Axis Deviation (ostium primum). * **Auscultation:** Characterized by a **fixed, wide splitting of S2** and a mid-diastolic flow murmur at the tricuspid area.

Q: Which of the following statements regarding peripartum cardiomyopathy is true?

Subsequent pregnancies carry a risk.. **Explanation:** Peripartum Cardiomyopathy (PPCM) is an idiopathic form of heart failure characterized by left ventricular systolic dysfunction (LVEF <45%) occurring toward the end of pregnancy or in the months following delivery, where no other cause of heart failure is found. **Why Option D is Correct:** Subsequent pregnancies carry a significant risk of recurrence and clinical deterioration. Even if the patient’s Left Ventricular (LV) function returns to normal, there is a **20% risk of relapse** in future pregnancies. If the LV function has not normalized, the risk of maternal mortality and severe heart failure is extremely high, and subsequent pregnancy is generally contraindicated. **Analysis of Incorrect Options:** * **Option A:** While serious, the mortality rate is not 40-50%. With modern management (including ACE inhibitors postpartum, beta-blockers, and bromocriptine), the mortality rate has decreased to approximately **5-10%**. * **Option B:** PPCM is not specifically associated with long-term hypertension. While hypertensive disorders of pregnancy are risk factors for developing PPCM, the cardiomyopathy itself does not cause chronic hypertension. * **Option C:** Pre-eclampsia is a major **risk factor** for PPCM, but it does not "cause" it in a direct physiological sense. PPCM is thought to be triggered by the cleavage of prolactin into a cardiotoxic 16kDa fragment. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Most commonly presents in the **1st month postpartum**. * **Risk Factors:** Advanced maternal age (>30), multiparity, twin pregnancy, and pre-eclampsia. * **Management:** Standard HF therapy, but **ACE inhibitors/ARBs are contraindicated until after delivery** (teratogenic). * **Bromocriptine:** Emerging therapy that inhibits prolactin secretion, potentially blocking the production of the cardiotoxic 16kDa fragment.

Q: Which of the following describes the marked ECG finding?

Electrical alternans. ***Electrical alternans*** - **Beat-to-beat alternation** in **QRS amplitude** or **axis** on ECG, commonly associated with **large pericardial effusion** and **cardiac tamponade**. - The heart swings back and forth within the fluid-filled pericardial sac, causing alternating **electrical axis** changes with each heartbeat. *T-wave alternans* - Refers to **beat-to-beat alternation** in **T-wave morphology** or amplitude, not QRS complexes. - Associated with **ventricular arrhythmias** and **sudden cardiac death** risk, particularly in patients with **heart failure**. *Electromechanical dissociation* - Describes **organized electrical activity** on ECG but **absent mechanical contraction** (no pulse). - Also known as **pulseless electrical activity (PEA)**, it's a cardiac arrest rhythm requiring immediate **CPR**. *All of the above* - Incorrect as each finding represents **distinct ECG abnormalities** with different underlying pathophysiology. - **Electrical alternans** specifically describes the **QRS alternation** pattern seen in **pericardial effusion**.

Question 1

Atrial fibrillation is seen in all of the following conditions EXCEPT:

Accepted Answer

Ventricular septal defect

Answer

Constrictive pericarditis

Answer

Atrial septal defect

Answer

Mitral stenosis

Question 2

A 50-year-old man has been experiencing fainting episodes for approximately 2 weeks. During these episodes, his ECG reveals a ventricular rate of 25 beats per minute and a P wave rate of 100 beats per minute. The episodes last about 30 seconds, after which a normal sinus rhythm spontaneously recurs. What is the most likely diagnosis?

Accepted Answer

Stokes-Adams syndrome

Answer

First-degree atrioventricular block

Answer

Second-degree atrioventricular block

Answer

Third-degree atrioventricular block

Question 3

All of the following statements are TRUE about infectious endocarditis EXCEPT?

Accepted Answer

Fatality rates for right-sided disease are greater than those for left-sided disease.

Answer

Cardiac valve leaflets are susceptible to infection because of their limited blood supply.

Answer

Streptococcus viridans is the most common organism implicated in left-sided disease.

Answer

More than three-fourths of cases of right-sided endocarditis are caused by Staphylococcus aureus.

Question 4

What TIMI score on angiography denotes complete occlusion of a coronary artery?

Accepted Answer

0

Answer

1

Answer

2

Answer

3

Question 5

A 42-year-old man with known valvular heart disease develops a fever for 1 week. He appears unwell; findings include a pansystolic murmur at the apex that radiates to the axilla and a soft S1 sound. He has petechiae on his conjunctival sac, linear hemorrhages under a few fingernails, and painful, tender, and erythematous nodules on some of the distal fingertips. Which of the following is the most responsible mechanism for these physical findings?

Accepted Answer

Vascular phenomena

Answer

Direct bacterial invasion

Answer

Immune response

Answer

Valvular damage

Question 6

Which of the following auscultatory signs is absent in mitral stenosis when atrial fibrillation is present?

Accepted Answer

Presystolic accentuation

Answer

Mid-diastolic murmur

Answer

Variable first heart sound

Answer

Loud P2

Question 7

Which of the following is NOT an X-ray feature of Atrial Septal Defect?

Accepted Answer

Left atrial enlargement

Answer

Right atrial enlargement

Answer

Pulmonary plethora

Answer

Small aortic knuckle

Question 8

Which of the following statements regarding peripartum cardiomyopathy is true?

Accepted Answer

Subsequent pregnancies carry a risk.

Answer

It has a 40-50% mortality even with treatment.

Answer

It is associated with a long-term increased incidence of hypertension.

Answer

Pre-eclampsia causes peripartum cardiomyopathy.

Question 9

Which of the following describes the marked ECG finding?

Accepted Answer

Electrical alternans

Answer

T-wave alternans

Answer

Electromechanical dissociation

Answer

All of the above

Question 10

A previously healthy 65-year-old woman presents with acute stroke. Examination reveals acute bilateral lower extremity deep vein thrombosis. Echocardiogram with agitated saline contrast shows bubbles crossing into the left atrium. Which of the following is most likely responsible for her symptoms?

Accepted Answer

Patent foramen ovale

Answer

Bicuspid aortic valve

Answer

Tetralogy of Fallot

Answer

Transposition of the great vessels

Cardiology — MCQs

Cardiology — MCQs

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