Aritmiya serdtsa - narusheniye chastoty, regularnosti ili mesta vozniknoveniya vozbuzhdeniya, a takzhe narusheniya provedeniya impulsov, v tom chisle izmeneniye normalnoy posledovatel'nosti aktivatsii predserdiy i zheludochkov. Narusheniya ritma serdtsa organicheskiye: a) zabolevaniya samogo serdtsa (IBS, miokardity, kardiomipatiya, miokardiodistrofiya, kardioskleroz); b) tyaželyye narusheniya gemodinamiki (šok lyuboy etiologii, arterial'naya gipertenziya, serdechnaya nedostatočnost', klapannyye poroki).