Extra heart beats: usually benign...but not always.
D005117:Cardiac Complexes, Premature; D002318:Cardiovascular Diseases / Q000401:mortality*; D015444:Exercise; D006801:Humans; D008297:Male; D008875:Middle Aged; D018879:Ventricular Premature Complexes / Q000209:etiology / Q000503:physiopathology*