An irregular heartbeat is an arrhythmia (also called dysrhythmia).心率不齐是心律失常（也称为节律紊乱） 。 Heart rates can also be irregular.心率也可不规则。 A normal heart rate is 50 to 100 beats per minute.正常心率是50到100每分钟心跳。 Arrhythmias and abnormal heart rates don't necessarily occur together.心律失常和心率异常不一定发生一起。 Arrhythmias can occur with a normal heart rate, or with heart rates that are slow (called bradyarrhythmias -- less than 60 beats per minute).心律失常可能发生的正常心率，或心率缓慢的（称为bradyarrhythmias -少于6 0次每分钟） 。 arrhythmias can also occur with rapid heart rates (called tachyarrhythmias -- faster than 100 beats per minute).室性心律失常也可能出现快速心率（称为心律失常-速度超过1 00次每分钟） 。 In the United States more than 850,000 people are hospitalized for an arrhythmia each year.在美国超过85.0万人住院治疗的心律失常，每年。

What Causes an Arrhythmia?是什么原因导致的心律失常？

Arrhythmias may be caused by many different factors, including:心律失常可能是由许多不同因素，包括：

• Coronary artery disease.冠状动脉疾病。
• Electrolyte imbalances in your blood (such as sodium or potassium).电解质不平衡在你的血液（如钠或钾） 。
• Changes in your heart muscle.变化中的心脏肌肉。
• Injury from a heart attack.损伤心脏病发作。
• Healing process after heart surgery.愈合过程后，心脏外科手术。

Irregular heart rhythms can also occur in "normal, healthy" hearts.心脏节律不规则，也可能发生在“正常，健康”的心。