成人的心跳一般每分钟约60～90次,而且快慢一致,节律规整。苦心跳过快、过慢或快慢不一、节律不整就叫心律失常。老人常见的心律失常主要有期前收缩、心房纤颤、心房扑动、室上性心动过速、传导阻滞、窦性心动过缓等。虽然许多心律失常并非心脏本身疾病引起(即功能性心律失常),如电解质紊乱(如高血钾或低血钾),某些药物过量或毒性作用(如洋地 Adult heart rate generally about 60 to 90 times per minute, and the same speed, rhythm and regularity. Painstakingly skip too fast or too slow, rhythm is not called arrhythmia. Common arrhythmias in the elderly are mainly pre-term contraction, atrial fibrillation, atrial flutter, supraventricular tachycardia, conduction block, sinus bradycardia and so on. Although many arrhythmias are not caused by the disease of the heart itself (ie, functional arrhythmias) such as electrolyte disturbances (such as hyperkalemia or hypokalemia), the overdose or toxic effects of certain drugs (eg,