A 59 year old man with severe myxomatous mitral regurgitation is asymptomatic, with a left venricular ejection fraction of 45% and an end systobc diameter index of 2.9 cm/m2. The most appropriate treatment is
**Core Concept**
The management of severe myxomatous mitral regurgitation (MMR) in asymptomatic patients depends on several factors, including left ventricular function, symptoms, and the size of the left atrium. The left ventricular ejection fraction (LVEF) and end-systolic diameter index (ESDi) are crucial parameters in determining the optimal treatment strategy.
**Why the Correct Answer is Right**
The patient has severe MMR with an LVEF of 45%, indicating moderate left ventricular dysfunction. The ESDi of 2.9 cm/m2 is also indicative of left ventricular dilation. In asymptomatic patients with severe MMR, surgical repair or replacement is usually recommended to prevent the progression of left ventricular dysfunction and the development of atrial fibrillation. The goal is to restore normal mitral valve function and reduce the volume overload on the left ventricle.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because watchful waiting is not appropriate for asymptomatic patients with severe MMR, as it may lead to the development of symptoms and further left ventricular dysfunction.
**Option B:** This option is incorrect because medical therapy alone, such as with ACE inhibitors or beta blockers, is not sufficient to manage severe MMR, especially in the presence of left ventricular dysfunction.
**Option C:** This option is incorrect because percutaneous mitral valve repair or replacement is not currently a recommended treatment for severe MMR in asymptomatic patients.
**Clinical Pearl / High-Yield Fact**
In patients with severe MMR, the development of symptoms, such as dyspnea or fatigue, is a critical factor in determining the need for surgical intervention. The presence of symptoms, even if mild, indicates a higher risk of adverse outcomes and warrants consideration of surgical repair or replacement.
**Correct Answer:** C. Surgical repair or replacement of the mitral valve is the most appropriate treatment for this patient.