Kalmar "extrasystolic" sifa ce da ta shafi ko kuma ta siffanta karin bugun bugun zuciya da ke faruwa a waje da yanayin bugun zuciya. A fannin likitanci, ana kiran wannan “extrasystole,” wanda shine naƙasasshiyar zuciya da wuri wanda ke faruwa kafin bugun zuciya na gaba na gaba. Saboda haka, "extrasystolic" yana bayyana wani abu mai alaƙa da ko haifar da extrasystoles.
