Cardiac

An abbreviation for millimeters of mercury. Blood pressure is measured in units of mm Hg—how high the pressure inside the arteries would be able to raise a column of mercury.

Failure of the mitral valve to close properly, causing blood to flow back into the heart’s upper left chamber (the left atrium) instead of moving forward into the lower left chamber (the left ventricle)

A condition that occurs when the leaflets of the mitral valve between the left atrium and left ventricle bulge into the atrium and permit backflow of blood. The condition can be associated with progressive mitral regurgitation