I-Defibrillator iyithuluzi lezokwelapha elisebenzisa ukushaya kwenhliziyo okunamandla ukuze lidlule enhliziyweni ukuze kuqedwe i-arrhythmia nokubuyisela isigqi se-sinus. Inezinzuzo zomphumela ophezulu wokwelapha, isenzo esisheshayo, ukusebenza okulula nokuphephile uma kuqhathaniswa nezidakamizwa. Futhi iyimishini yosizo lokuqala edingekayo egumbini lokuhlinza.