**Question:** The 9 month old child of a diabetic mother presents with tachypnea and hepatomegaly. Echo cardiography of the heart showed normal cardiac morphology with asymmetric septal hypertrophy. Which of the following you will give to treat this child

A. Enalapril
B. Amlodipine
C. Captopril
D. Betaxolol

**Core Concept:**

The underlying condition in this scenario is a form of congenital heart disease called "hypertrophic cardiomyopathy" or simply "hypertrophic cardiomyopathy" (HCM). This condition is characterized by the abnormal thickening of the heart muscle, particularly in the left ventricular septum (the dividing wall between the left ventricle and the right ventricle), leading to the symptoms observed in the child. In this case, the child's heart is functioning normally.

**Why the Correct Answer is Right:**

The correct answer is A. Enalapril. Enalapril is an angiotensin-converting enzyme (ACE) inhibitor, which is used to treat hypertension and heart failure by blocking the formation of angiotensin II, a potent vasoconstrictor and aldosterone stimulator. In HCM, ACE inhibitors can help alleviate symptoms by reducing the afterload (blood pressure against the heart) and preload (amount of blood going into the heart). This results in a decrease in left ventricular mass and wall thickness, leading to improved heart function.

**Why Each Wrong Option is Incorrect:**

B. Amlodipine is a calcium channel blocker (CCB) primarily used for hypertension and angina. It does not target the hypertrophic cardiomyopathy directly.

C. Captopril is another ACE inhibitor like enalapril, but it is not as commonly used as enalapril for this condition.

D. Betaxolol is a beta-blocker, which is not suitable for treating HCM. Beta-blockers are typically used for hypertension and angina, not HCM.

**Clinical Pearls:**

1. HCM is a genetic disorder and can be inherited from the diabetic mother.
2. Symptoms and complications of HCM may overlap with asthma, leading to potential misdiagnosis.
3. In severe cases, HCM can lead to heart failure, arrhythmias, and sudden cardiac death due to the abnormal thickening of the heart muscle.
4. Correct diagnosis and management are essential to prevent complications and ensure optimal patient care.