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
Cardiac
Sinus Tachycardia
A heart rhythm that originates in the sinus node and proceeds through the rest of the electrical conduction system, but is faster than normal.
Sick Sinus Syndrome [SSS]
The failure of the sinus node to regulate the heart’s rhythm