[PHONOCARDIOGRAPHY AND SYSTOLIC PERIOD IN EXTRASYSTOLE].
D005117:Cardiac Complexes, Premature; D006801:Humans; D010701:Phonocardiography; D013599:Systole
EXTRASYSTOLE; PHONOCARDIOGRAPHY
FKG I PERIODY SISTOLY PRI 'EKSTRASISTOLICHESKOPI ARITMII.