OCCASIONAL APPEARANCE OF QRS COMPLEXES WITH VENTRICULAR PRE-EXCITATION.
D005117:Cardiac Complexes, Premature; D004417:Dyspnea; D004562:Electrocardiography; D006801:Humans; D005082:Physical Exertion; D013610:Tachycardia; D013614:Tachycardia, Paroxysmal
DYSPNEA; ELECTROCARDIOGRAPHY; EXERTION; EXTRASYSTOLE; TACHYCARDIA, PAROXYSMAL