Palpitation
An uncomfortable feeling within the chest caused by an irregular heartbeat.
Cardiac
Non-ST-Segment-Elevation Myocardial Infarction [NSTEMI]
The milder form of the 2 types of heart attack, an NSTEMI does not produce an ST-segment elevation on an electrocardiogram. See also STEMI
Myocarditis
A rare condition in which the heart muscle becomes inflamed as a result of infection, toxic drug poisoning, or diseases like rheumatic fever, diphtheria, or tuberculosis.