The correct answer is mitral valve prolapse.
The condition takes place when the leaflets of the mitral valve prolapse (bulge) into the left upper chamber, that is, left atrium of the heart, like a parachute at the time of contraction of the heart.
The symptoms of the condition are dizziness or light-headedness, irregular heartbeat, shortness of breath, chest pain that is not due to any coronary heart disease or heart attack, and fatigue.
The signs of mitral valve prolapse include a crisp mid-systolic click, succeeded by a late systolic mumble if regurgitation is existing.