All of the following statements about mitral valve prolapse are true except:
**Core Concept**
Mitral valve prolapse (MVP) is a condition characterized by the abnormal displacement of the mitral valve leaflets into the left atrium during systole, often resulting from myxomatous degeneration of the valve tissue.
**Why the Correct Answer is Right**
Mitral valve prolapse is a common condition, affecting approximately 2-3% of the general population. The condition often presents with symptoms such as palpitations, dyspnea, and chest pain, although many cases are asymptomatic. The diagnosis is typically made through echocardiography, which can demonstrate the characteristic leaflet prolapse. In some cases, MVP can lead to mitral regurgitation, a condition where blood flows backward from the left ventricle into the left atrium.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is incorrect because mitral valve prolapse is often associated with myxomatous degeneration of the valve tissue, which can lead to leaflet thickening and redundancy. However, MVP is not typically caused by rheumatic heart disease, which is more commonly associated with mitral stenosis.
**Option B:** This statement is incorrect because while mitral valve prolapse can coexist with other cardiac conditions, such as coronary artery disease, the presence of MVP does not directly increase the risk of myocardial infarction. However, patients with MVP may be at increased risk for arrhythmias and sudden cardiac death.
**Option C:** This statement is incorrect because although mitral valve prolapse is often associated with mitral regurgitation, the condition can also be asymptomatic and may not always lead to significant valvular dysfunction.
**Option D:** This statement is incorrect because while mitral valve prolapse is often diagnosed through echocardiography, the condition can also be diagnosed through other imaging modalities, such as cardiac MRI or transesophageal echocardiography.
**Clinical Pearl / High-Yield Fact**
A key clinical pearl for MVP is that the condition is often associated with a characteristic "click" or "snap" sound, which can be heard through a stethoscope during physical examination. This sound is thought to be caused by the sudden displacement of the leaflets into the left atrium.
**Correct Answer: A.**