The heart's parachute: why your mitral valve might bulge backward

Science · Published 23 October 2026 Swipe more like this →

In short: Imagine a heart valve that behaves like a parachute. In mitral valve prolapse, the flaps of the heart's primary valve become floppy, bulging backward into the upper chamber as the heart squeezes. While often benign, this structural quirk can lead to significant blood leakage and complex cardiac rhythms.

Mitral valve prolapse (MVP) is the most common valvular abnormality, affecting approximately 5% of the population. It occurs when the leaflets of the mitral valve—which separate the left atrium from the left ventricle—become floppy and bulge backward into the left atrium during systole (the heart's contraction). This structural weakness can cause the valve to fail to close properly, leading to mitral regurgitation, where blood leaks backward into the upper chamber. The underlying cause is often linked to myxomatous degeneration, a weakening of the valve tissue that can be hereditary. Researchers have identified several genes associated with this condition, including MMVP, FLNA, DCHS1, DZIP1, and PLD1. While some cases are primary—characterized by thickened flaps, scarring, or lengthened 'chordae tendineae' (tendon-like cords)—secondary MVP can result from external damage. This includes ischemic damage from coronary artery disease, rheumatic heart disease, or hypertrophic cardiomyopathy, where the heart muscle mass is larger than normal. While many people with MVP experience no symptoms at all, others may develop gradual issues like palpitations, dizziness, fatigue, or shortness of breath during exercise. Notably, the progression of the condition can vary by sex; while it is more common in females, men are more likely to progress to significant mitral regurgitation. In some instances, the condition is linked to connective tissue disorders like Marfan's Syndrome or scoliosis. Because symptoms vary widely, clinical management focuses on the severity of the blood backflow, with some patients requiring medication or surgery while others require no treatment at all.

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