Blood leaks back into the chambers rather than flowing forward through the heart or into an artery. In the United States, backflow most often is due to prolapse. Prolapse is when the flaps of the valve flop or bulge back into an upper heart chamber during a heartbeat. Prolapse mainly affects the mitral valve.
NSTEMI is a shorthand medical term for non-ST segment elevation myocardial infarction. It is one type of myocardial infarction also called heart attack.
STEMI is a more severe type of AMI than NSTEMI and is associated with a higher short-. term death rate. Approximately 60 to 65 percent of STEMIs occur in patients age 65 or. older, and patients 65 and older account for up to 80 percent of all AMI-related deaths.1.