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.
Nonsuicidal self-injury (NSSI) consists of self-inflicted deliberately destructive acts resulting in tissue damage that are not intended as an act of suicide, are not widely socially acceptable, and are not due to intellectual disability, autism, or other developmental disorders. This definition is important. For one thing, it helps distinguish self-injury from suicide attempts. This distinction has resulted in the term nonsuicidal self-injury (NSSI). The two behaviors are very different and have very different motivations. In short, suicide is an attempt to die, and self-injury is coping mechanism for survival.