In all patients there were 30 cases of sinus bradycardia(15.46%),10 cases of prolongation of P R interval(5.15%),6 cases of escape beat rhythm(3.0%),and 16 cases of prolongation of Q T interval(8.25%).

• 窦性心动过缓 30例 (15 .；46%25 )；P- R间期延长者 10例 (5