心房颤动(atrial fibrillation)的特征是心房快速和不规则的收缩活动，例如：人类房颤时心房壁的激动频率是400-600次/分。

• Atrial fibrillation(AF) is characterized by rapid and irregular activation of the atrium, for example, 400-600 pulses of the atrium muscular wall per minute in humans.