Mechanisms of Arrhythmias 2.后除极与触发活动 平台期延长 早后除极 (afterdepolarization and triggered activity) 早后除极(EAD):发生在 2、3相中，与钙内流增多有 关。 迟后除极 钙超载 迟后除极(DAD):发生在 4相，胞内钙多，诱发短暂的钠 内流
2. 后除极与触发活动∶ (afterdepolarization and triggered activity) 早后除极(EAD)∶发生在 2、3相中， 与钙内流增多有 关。 迟后除极(DAD)∶发生在 4相，胞内钙多,诱发短暂的钠 内流 . Mechanisms of Arrhythmias
Cardiac Conductive System SA node Internodal atrial pathways AV junction AV node Bundle of His Interventricular septum Left bundle branch Right bundle branch Purkinje fibers Purkinje network
Cardiac Conductive System