A 52-year-old man presents with exertional chest pain and dyspnea. On examination, a late systolic murmur is heard at the apex that increases with standing. Echocardiography shows prolapse of the mitral valve leaflets into the left atrium during systole. Which investigation is most appropriate to assess the hemodynamic consequences and degree of mitral regurgitation in this patient?

## Investigation of Choice for Mitral Valve Prolapse with Regurgitation **High-Yield:** Doppler echocardiography is the gold standard non-invasive investigation for assessing mitral valve prolapse and quantifying the severity and hemodynamic impact of mitral regurgitation. ### Why Doppler Echocardiography? **Key Point:** Doppler echocardiography provides: - Real-time visualization of mitral valve leaflet motion and prolapse - Color flow Doppler to detect and grade the severity of mitral regurgitation (mild, moderate, severe) - Continuous wave Doppler to measure the regurgitant jet velocity and estimate left atrial pressure - Assessment of left ventricular and left atrial dimensions - Calculation of regurgitant volume and effective regurgitant orifice area ### Comparison with Other Investigations | Investigation | Role in MVP | Limitations | |---|---|---| | Doppler Echocardiography | Gold standard; quantifies MR severity and hemodynamics | Non-invasive, widely available | | Cardiac Catheterization | Invasive; reserved for coronary assessment or when echo inconclusive | Invasive; not first-line for MVP assessment | | Chest X-ray | Shows cardiac silhouette changes in chronic MR | Cannot visualize valve pathology or quantify regurgitation | | Electrocardiography | May show nonspecific ST-T changes or arrhythmias | Does not assess valve structure or function | **Clinical Pearl:** The late systolic murmur that increases with standing (decreased venous return → earlier prolapse → earlier murmur onset) is a classic finding in mitral valve prolapse and is best confirmed and quantified by Doppler echocardiography. **Mnemonic — ECHO for MVP:** **E**chocardiography, **C**olor Doppler, **H**emodynamic assessment, **O**utcome prediction.