Stenosis
The narrowing or constriction of an opening, such as a blood vessel or heart valve.
Disorder
ST-segment-elevation myocardial infarction [STEMI]
The more severe form of the 2 types of heart attack. See also NSTEMI. A STEMI produces a characteristic elevation in the ST segment on an electrocardiogram
Sick Sinus Syndrome [SSS]
The failure of the sinus node to regulate the heart’s rhythm