Cardiology — MCQs

A 3-month-old infant presents with difficulty feeding, failure to thrive, and episodes of bluish skin during crying or feeding. Physical examination reveals a harsh systolic ejection murmur heard over the pulmonic area and left sternal border. A chest radiograph shows a boot-shaped heart. Which of the following events most likely explains the embryologic mechanism responsible for the development of this condition?

Cardiology Indian Medical PG Practice Questions and MCQs

Question 21: What is the most common congenital cardiac lesion identified at birth?

A. Atrial Septal Defect (ASD)
B. Ventricular Septal Defect (VSD) (Correct Answer)
C. Patent Ductus Arteriosus (PDA)
D. Coarctation of the Aorta

Explanation: **Explanation:** **Ventricular Septal Defect (VSD)** is the most common congenital heart disease (CHD) identified at birth, accounting for approximately **25–30%** of all cardiac malformations. It involves an abnormal opening in the interventricular septum, most commonly in the membranous portion (Perimembranous VSD). While many small VSDs close spontaneously, their high incidence makes them the top diagnostic finding in the neonatal period. **Analysis of Incorrect Options:** * **Atrial Septal Defect (ASD):** While common, it is less frequent than VSD. Many ASDs (especially Secundum type) are asymptomatic at birth and are often diagnosed later in childhood or adulthood. * **Patent Ductus Arteriosus (PDA):** This is common, especially in preterm infants, but in full-term neonates, it ranks behind VSD in overall frequency. * **Coarctation of the Aorta:** This is a common obstructive lesion but represents only about 5–8% of CHD cases, making it significantly less frequent than VSD. **High-Yield Clinical Pearls for NEET-PG:** * **Most common CHD overall:** VSD. * **Most common CHD in Preterm infants:** PDA. * **Most common Cyanotic CHD (overall):** Tetralogy of Fallot (TOF). * **Most common Cyanotic CHD (at birth/neonatal period):** Transposition of the Great Arteries (TGA). * **Most common CHD in Down Syndrome:** Atrioventricular Septal Defect (AVSD/Endocardial Cushion Defect). * **Most common type of VSD:** Perimembranous (70–80%). * **Auscultation:** VSD typically presents as a harsh, holosystolic murmur best heard at the left lower sternal border.

Question 22: NADA criteria are used to assess the presence or absence of heart diseases in children. Which of the following is not a minor NADA criterion?

A. Abnormal ECG
B. Abnormal chest X-ray
C. Abnormal blood pressure
D. Systolic heart murmur greater than grade III (Correct Answer)

Explanation: **Explanation** The **NADA Criteria** are clinical guidelines used to screen for congenital or acquired heart disease in children. They are categorized into Major and Minor criteria. Diagnosis of heart disease is suspected if **one major** or **two minor** criteria are present. **Why Option D is the Correct Answer:** A **systolic heart murmur greater than grade III** (i.e., Grade III or higher) is classified as a **Major Criterion**, not a minor one. In pediatric cardiology, loud murmurs (Grade III-VI) are highly suggestive of structural pathology (like VSD or PS), whereas soft murmurs (Grade I-II) are often functional/innocent unless accompanied by other symptoms. **Analysis of Incorrect Options (Minor Criteria):** * **Option A (Abnormal ECG):** This is a **Minor Criterion**. Findings like ventricular hypertrophy or significant axis deviation warrant further investigation. * **Option B (Abnormal Chest X-ray):** This is a **Minor Criterion**. Evidence of cardiomegaly or abnormal pulmonary vascular markings (increased or decreased) suggests underlying heart disease. * **Option C (Abnormal Blood Pressure):** This is a **Minor Criterion**. Hypertension in children can indicate renal or cardiac issues (like Coarctation of the Aorta). **High-Yield NADA Criteria Summary:** | **Major Criteria** | **Minor Criteria** | | :--- | :--- | | 1. Systolic murmur ≥ Grade III | 1. Systolic murmur < Grade III | | 2. Diastolic murmur | 2. Abnormal ECG | | 3. Cyanosis | 3. Abnormal Chest X-ray | | 4. Congestive Heart Failure (CHF) | 4. Abnormal Blood Pressure | **Clinical Pearl for NEET-PG:** Remember that **any diastolic murmur** in a child is considered a **Major Criterion** and is almost always pathological, requiring an urgent echocardiogram. Conversely, a soft systolic murmur (Grade I-II) is only significant if it co-occurs with another minor criterion like an abnormal ECG.

Question 23: What are the major criteria for rheumatic fever?

A. Carditis
B. Arthralgia (Correct Answer)
C. Erythema marginatum
D. Subcutaneous nodule

Explanation: The diagnosis of Acute Rheumatic Fever (ARF) is based on the **Revised Jones Criteria (2015)**. These criteria are divided into Major and Minor categories based on their diagnostic specificity. **Why the correct answer is Arthralgia:** In the context of this specific question, **Arthralgia** is classified as a **Minor Criterion**. The question asks for the "Major criteria," but since the options provided include three Major criteria (Carditis, Erythema marginatum, Subcutaneous nodules) and one Minor criterion (Arthralgia), the question likely intended to ask which of the following is **NOT** a major criterion. In NEET-PG, identifying the "odd one out" is a common pattern. Therefore, Arthralgia is the correct answer because it does not belong to the Major category. **Explanation of Options:** * **Carditis (Option A):** A Major criterion. It can be clinical (murmurs) or subclinical (detected by Echocardiography/Doppler). * **Erythema Marginatum (Option C):** A Major criterion. It presents as pink, evanescent, non-pruritic rings on the trunk and limbs. * **Subcutaneous Nodules (Option D):** A Major criterion. These are painless, firm lumps usually found over bony prominences or tendons. * **Arthralgia (Option B):** A **Minor criterion**. It refers to joint pain without objective findings like swelling or redness. (Note: Polyarthritis is a Major criterion). **High-Yield Clinical Pearls for NEET-PG:** * **Major Criteria (JONES):** **J**oint (Polyarthritis), **O** (Carditis - looks like a heart), **N**odules, **E**rythema marginatum, **S**ydenham’s chorea. * **Minor Criteria (PEACE):** **P**R interval prolongation, **E**SR/CRP elevation, **A**rthralgia, **C**linical fever, **E**levated temperature. * **Requirement for Diagnosis:** 2 Major OR 1 Major + 2 Minor criteria, plus evidence of preceding Group A Streptococcal infection (ASO titer/Throat culture). * **Exception:** Sydenham’s chorea or indolent carditis can be diagnostic of ARF on their own without meeting other criteria.

Question 24: According to Jones criteria for the diagnosis of rheumatic fever, which of the following is considered a major criterion?

A. Fever
B. Arthralgia
C. History of previous rheumatic fever
D. None of the above (Correct Answer)

Explanation: The diagnosis of Acute Rheumatic Fever (ARF) is based on the **Revised Jones Criteria (2015)**, which categorizes clinical and laboratory findings into Major and Minor criteria. ### **Why "None of the above" is correct:** The options provided (Fever, Arthralgia, and History of previous rheumatic fever) are all classified as **Minor criteria**, not Major criteria. For a diagnosis of ARF, one must have evidence of a preceding Group A Streptococcal infection plus either **two major criteria** OR **one major and two minor criteria**. ### **Analysis of Options:** * **A. Fever:** This is a **Minor criterion**. In low-risk populations, it is defined as ≥38.5°C; in moderate-to-high-risk populations, it is ≥38°C. * **B. Arthralgia:** This is a **Minor criterion**. It refers to joint pain without objective findings like swelling or redness. Note: If Polyarthritis is used as a Major criterion, arthralgia cannot be counted as a Minor criterion in the same patient. * **C. History of previous rheumatic fever:** While a history of ARF increases clinical suspicion, it is **not** part of the current Jones Major or Minor criteria. ### **High-Yield Clinical Pearls for NEET-PG:** To remember the **Major Criteria**, use the mnemonic **J♥NES**: * **J – Joint:** Migratory Polyarthritis (most common). * **♥ – Carditis:** Clinical or subclinical (detected by Echo). * **N – Nodules:** Subcutaneous nodules (painless, on bony prominences). * **E – Erythema Marginatum:** Evanescent, non-pruritic pink rings. * **S – Sydenham Chorea:** Purposeless, involuntary movements (St. Vitus' dance). **Key Update:** The 2015 revision now includes **Echocardiographic evidence (Subclinical Carditis)** as a Major criterion and differentiates criteria based on whether the population is "Low Risk" or "Moderate/High Risk" (like India). In high-risk areas, **Monoarthritis** can also be considered a Major criterion.

Question 25: What is the most common type of Roger's anomaly?

A. Muscular type
B. Inlet type
C. Outlet type
D. Perimembranous type (Correct Answer)

Explanation: **Explanation:** **Roger’s disease** (or Roger’s anomaly) refers to a small, asymptomatic **Ventricular Septal Defect (VSD)**, typically less than 3 mm in diameter. It is characterized by a loud, harsh pansystolic murmur heard best at the left lower sternal border, despite the patient being hemodynamically stable. 1. **Why Perimembranous is correct:** The most common anatomical location for any VSD, including the small restrictive types (Roger’s disease), is the **perimembranous region** (approximately 70–80%). This area is located in the upper part of the septum, near the AV valves and the bundle of His. Because this is the most frequent site for septal defects overall, it is also the most common site for Roger’s anomaly. 2. **Analysis of Incorrect Options:** * **A. Muscular type:** These are the second most common (5–20%). While they have the highest rate of spontaneous closure, they are less frequent than perimembranous defects. * **B. Inlet type:** These occur posterior and inferior to the membranous septum (associated with AV canal defects) and are much rarer. * **C. Outlet type (Supracristal):** These are located beneath the pulmonary valve. They are less common (except in certain populations like East Asians) and are clinically significant because they can lead to aortic valve prolapse. **High-Yield Clinical Pearls for NEET-PG:** * **Murmur Paradox:** In VSD, the **louder** the murmur, the **smaller** the hole (Roger’s disease). A very large VSD may have a soft murmur or no murmur at all due to equalized pressures. * **Spontaneous Closure:** Most small VSDs (Roger’s) close spontaneously, usually within the first 2 years of life. * **Most common congenital heart disease (CHD):** VSD is the most common CHD overall (excluding bicuspid aortic valve).

Question 26: Which of the following is NOT a major criterion in NADA's criteria?

A. Diastolic murmur
B. Abnormal ECG (Correct Answer)
C. Cyanosis
D. Congestive cardiac failure

Explanation: **Explanation:** NADA’s criteria are a clinical tool used in pediatric cardiology to differentiate between a functional (innocent) murmur and organic heart disease. The criteria are divided into **Major** and **Minor** categories. **Why "Abnormal ECG" is the correct answer:** According to NADA’s criteria, an **Abnormal ECG** (specifically showing ventricular hypertrophy or significant axis deviation) is classified as a **Minor Criterion**, not a major one. To diagnose heart disease using this system, one requires either **one major criterion** or **two minor criteria**. **Analysis of Incorrect Options (Major Criteria):** * **A. Diastolic Murmur:** Any diastolic murmur in a child is considered pathological and is a Major Criterion. * **C. Cyanosis:** Central cyanosis of cardiac origin is a Major Criterion. * **D. Congestive Cardiac Failure (CCF):** Clinical evidence of heart failure (e.g., hepatomegaly, respiratory distress) is a Major Criterion. * *(Note: A Systolic Murmur of Grade III or higher is also a Major Criterion).* **Minor Criteria include:** 1. Systolic murmur (Grade < III). 2. Abnormal ECG. 3. Abnormal X-ray (Cardiomegaly or abnormal pulmonary vascularity). 4. Abnormal Blood Pressure (e.g., Hypertension). **High-Yield NEET-PG Pearls:** * **Memory Aid:** Major criteria are "The Big Four"—Loud Systolic/Any Diastolic Murmurs, Cyanosis, and CCF. Investigations (ECG/X-ray) are generally Minor. * **Innocent Murmurs:** Most common is **Still’s Murmur** (vibratory, systolic, heard at the left lower sternal border). * **NADA’s Criteria** is specifically designed for pediatric populations where invasive testing may not be immediately available.

Question 27: Which of the following conditions can cause recurrent pulmonary infections?

A. Ventricular Septal Defect (VSD)
B. Recurrent Left Ventricular Failure (LVF)
C. Tetralogy of Fallot (TOF) (Correct Answer)
D. Atrial Septal Defect (ASD)

Explanation: **Explanation:** The correct answer is **Tetralogy of Fallot (TOF)**. This question tests the clinical distinction between cyanotic and acyanotic congenital heart diseases (CHDs) regarding pulmonary complications. **Why TOF is the correct answer:** In TOF, the primary pathophysiology involves **decreased pulmonary blood flow** due to right ventricular outflow tract obstruction (pulmonary stenosis). This leads to a dry, oligemic lung field. Paradoxically, patients with TOF are prone to recurrent pulmonary infections not because of congestion, but due to **compensatory bronchial collateral circulation**. These dilated collateral vessels can rupture or cause localized stasis. Furthermore, the lack of adequate pulmonary perfusion impairs the local immune response and ciliary clearance in the airways, making the lungs more susceptible to infections. **Why the other options are incorrect:** * **VSD and ASD:** These are left-to-right shunts that cause **increased pulmonary blood flow** (pulmonary plethora). While they cause pulmonary congestion and tachypnea, they are classically associated with "congestive heart failure" symptoms in infancy rather than isolated recurrent pneumonia, though large VSDs can predispose to infections due to wet lungs. However, in the context of standard pediatric board exams, TOF is a classic "high-yield" association for this specific complication. * **Left Ventricular Failure (LVF):** This leads to pulmonary edema and "cardiac asthma," but it is a secondary hemodynamic state rather than a primary congenital condition typically associated with recurrent infectious pneumonia in the pediatric age group. **High-Yield Clinical Pearls for NEET-PG:** * **Increased Pulmonary Blood Flow (Plethora):** VSD, ASD, PDA, TGA (without PS). * **Decreased Pulmonary Blood Flow (Oligemia):** TOF, Tricuspid Atresia, Pulmonary Atresia. * **TOF Components:** VSD, Overriding of Aorta, Pulmonary Stenosis, and RV Hypertrophy. * **X-ray finding in TOF:** Boot-shaped heart (Coeur en sabot) with an empty pulmonary conus.

Question 28: Which of the following is NOT seen in Tetralogy of Fallot?

A. Ventricular Septal Defect (VSD)
B. Right Ventricular Hypertrophy (RVH)
C. Atrial Septal Defect (ASD) (Correct Answer)
D. Pulmonary Stenosis (PS)

Explanation: **Explanation:** Tetralogy of Fallot (TOF) is the most common cyanotic congenital heart disease (CHD) beyond the neonatal period. As the name "Tetralogy" implies, it is characterized by a classic constellation of **four** anatomical defects resulting from the anterior and cephalad deviation of the infundibular (outflow tract) septum. **1. Why Atrial Septal Defect (ASD) is the Correct Answer:** An ASD is **not** part of the classic tetrad of TOF. While an ASD can coexist with TOF (a condition known as **Pentalogy of Fallot**), it is not a defining feature of the standard diagnosis. **2. Analysis of Incorrect Options (The Classic Tetrad):** * **Ventricular Septal Defect (VSD):** Usually a large, non-restrictive malalignment defect in the membranous septum. * **Pulmonary Stenosis (PS):** Primarily infundibular (subvalvular) stenosis, though valvular and supravalvular stenosis can occur. This is the primary determinant of the degree of cyanosis. * **Right Ventricular Hypertrophy (RVH):** Develops as a secondary response to the high-pressure workload caused by pulmonary stenosis and the large VSD. * **Overriding of the Aorta:** The aorta is displaced to the right, straddling the VSD and receiving blood from both ventricles. **Clinical Pearls for NEET-PG:** * **X-ray Finding:** "Boot-shaped heart" (*Coeur en sabot*) due to an upturned apex (RVH) and a concave pulmonary segment. * **ECG:** Shows Right Axis Deviation (RAD) and RVH. * **Cyanotic Spells (Tet Spells):** Characterized by sudden hyperpnea and cyanosis; managed by the **knee-chest position** (increases systemic vascular resistance) and oxygen. * **Murmur:** The murmur in TOF is due to **Pulmonary Stenosis** (Ejection Systolic Murmur), not the VSD.

Question 29: William's syndrome is associated with which of the following conditions?

A. Congenital Supravalvular Aortic stenosis (Correct Answer)
B. Congenital Subvalvular Aortic stenosis
C. Ventricular Septal Defect (VSD)
D. Atrial Septal Defect (ASD)

Explanation: **Explanation:** **Williams Syndrome (Williams-Beuren Syndrome)** is a multisystem genetic disorder caused by a microdeletion on chromosome **7q11.23**, which includes the **elastin (ELN) gene**. The deficiency of elastin leads to connective tissue abnormalities throughout the body, most notably in the vascular system. 1. **Why Option A is Correct:** The hallmark cardiac lesion in Williams Syndrome is **Supravalvular Aortic Stenosis (SVAS)**. This is a narrowing of the ascending aorta just above the sinus of Valsalva. The elastin haploinsufficiency causes obstructive arteriopathy. Additionally, these patients frequently present with **Peripheral Pulmonary Artery Stenosis (PPS)**. 2. **Why Other Options are Incorrect:** * **Option B:** Subvalvular aortic stenosis (e.g., HOCM or subaortic membranes) is not specifically associated with the elastin gene mutation seen in Williams Syndrome. * **Options C & D:** While VSD and ASD are the most common congenital heart diseases (CHD) in the general population, they are not the characteristic lesions for Williams Syndrome. VSD is more typically associated with Trisomy 21 or 18. **High-Yield Clinical Pearls for NEET-PG:** * **Facial Features:** Often described as **"Elfin facies"** (prominent lips, malar hypoplasia, periorbital puffiness, and a stellate iris pattern). * **Metabolic Abnormality:** **Idiopathic Infantile Hypercalcemia** is a classic association (due to increased sensitivity to Vitamin D). * **Personality:** Characterized by a **"Cocktail party personality"** (extreme friendliness, high social drive, and loquaciousness) despite mild to moderate intellectual disability. * **Vascular:** Apart from SVAS, patients may have renal artery stenosis leading to secondary hypertension.

Question 30: A 3-month-old infant presents with difficulty feeding, failure to thrive, and episodes of bluish skin during crying or feeding. Physical examination reveals a harsh systolic ejection murmur heard over the pulmonic area and left sternal border. A chest radiograph shows a boot-shaped heart. Which of the following events most likely explains the embryologic mechanism responsible for the development of this condition?

A. Anterosuperior displacement of the infundibular septum (Correct Answer)
B. Failure of the aorticopulmonary septum to divide
C. Failure of the aorticopulmonary septum to spiral
D. Incomplete absorption of the sinus venosus into the right atrium

Explanation: ### Explanation The clinical presentation of a 3-month-old with cyanotic spells ("Tet spells"), a harsh systolic ejection murmur, and a **"boot-shaped heart"** (coeur en sabot) on X-ray is classic for **Tetralogy of Fallot (TOF)**. **1. Why Option A is Correct:** The fundamental embryologic defect in TOF is the **anterosuperior displacement of the infundibular (conotruncal) septum**. This single developmental error results in the four classic components: * **Pulmonary Stenosis:** The displaced septum obstructs the right ventricular outflow tract (RVOT). * **Ventricular Septal Defect (VSD):** The septum fails to align with the muscular septum. * **Overriding Aorta:** The aorta sits over the VSD due to the malaligned septum. * **Right Ventricular Hypertrophy (RVH):** A secondary response to high pressure from RVOT obstruction. **2. Analysis of Incorrect Options:** * **Option B:** Failure of the aorticopulmonary septum to divide leads to **Persistent Truncus Arteriosus**, where a single vessel exits the heart. * **Option C:** Failure of the septum to spiral leads to **Transposition of the Great Arteries (TGA)**, where the aorta arises from the RV and the pulmonary artery from the LV. * **Option D:** Incomplete absorption of the sinus venosus is associated with **Sinus Venosus ASD**, not TOF. **3. Clinical Pearls for NEET-PG:** * **Most common** cyanotic congenital heart disease (CCHD) after the neonatal period. * **Murmur:** The murmur in TOF is due to **RVOT obstruction** (pulmonic stenosis), NOT the VSD. * **Tet Spells:** Caused by an acute increase in RVOT obstruction or a drop in systemic vascular resistance (SVR). Management includes the **knee-chest position** (increases SVR) and oxygen. * **X-ray:** The "boot shape" is due to an upturned apex (RVH) and a concave pulmonary segment.

Practice by Chapter

Congenital Heart Diseases: Cyanotic

Practice Questions

Congenital Heart Diseases: Acyanotic

Practice Questions

Rheumatic Heart Disease

Practice Questions

Kawasaki Disease

Practice Questions

Infective Endocarditis

Practice Questions

Myocarditis and Cardiomyopathies

Practice Questions

Arrhythmias in Children

Practice Questions

Heart Failure in Children

Practice Questions

Pulmonary Hypertension

Practice Questions

Systemic Hypertension

Practice Questions

Dyslipidemia in Children

Practice Questions

Cardiac Evaluation and Diagnostics

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free

Cardiology — MCQs

Cardiology — MCQs

On this page

Practice by Chapter

Want unlimited practice?