Ejection click is heard in:
**Core Concept**
The ejection click is a clinical sign associated with valvular heart disease, particularly aortic regurgitation. It is a sharp, high-pitched sound heard at the beginning of systole, corresponding to the sudden opening of the aortic valve.
**Why the Correct Answer is Right**
The ejection click is caused by the sudden opening of the aortic valve, which occurs when the pressure in the left ventricle exceeds the pressure in the aorta. This is often seen in conditions such as aortic regurgitation, where the aortic valve is incompetent and allows blood to flow back into the left ventricle during diastole. The ejection click is a characteristic finding in these patients, as the left ventricle attempts to compensate for the regurgitation by increasing its volume and contractility.
**Why Each Wrong Option is Incorrect**
**Option A:** Mitral stenosis is a condition characterized by narrowing of the mitral valve, which would lead to a mid-diastolic murmur, not an ejection click.
**Option B:** Pulmonary hypertension is a condition characterized by elevated blood pressure in the pulmonary arteries, which would lead to a systolic ejection murmur due to increased flow across the pulmonary valve, not an ejection click.
**Option C:** Tricuspid regurgitation is a condition characterized by incompetence of the tricuspid valve, which would lead to a systolic murmur due to regurgitation of blood into the right atrium, not an ejection click.
**Clinical Pearl / High-Yield Fact**
The ejection click is a high-yield sign of aortic regurgitation, and it is often accompanied by a mid-systolic murmur due to the regurgitant flow. Remember the "3 Ps" of aortic regurgitation: pain, palpitations, and paroxysmal nocturnal dyspnea.
**Correct Answer:** C. Aortic regurgitation.