vena cava Phase 0 SA node AV node Phase Purkinje Mitral valve Action potential phases 0: Upstroke Ventricle 1: Early-fast repolarization 2: Plateau 3: Repolarization ECG iQ S Impulse generation and conduction in the heart
Impulse generation and conduction in the heart
A. Electrophysiological basis of arrhythmias 0 3. Abnormal generation of impulse u(1 Augmented automaticity u Augmented automaticity in the myocardial cells other than the sinoatrial node cells will produce arrhythmias u Maximal diastolic potential (MDP)in phase 4: ischemia, digitalis, sympathetic excitation, imbalance of electrolytes u Fast spontaneous depolarization in phase 4:fast ponse cells- slow response cells
3. Abnormal generation of impulse (1) Augmented automaticity Augmented automaticity in the myocardial cells other than the sinoatrial node cells will produce arrhythmias Maximal diastolic potential (MDP) in phase 4: ischemia, digitalis, sympathetic excitation, imbalance of electrolytes Fast spontaneous depolarization in phase 4：fast response cells → slow response cells A. Electrophysiological basis of arrhythmias