This typically happens when atrial cells get irritated and stressed - the causes of that might include electrolyte imbalances, drugs like cocaine or methamphetamines, ischemic damage like a heart attack, or anything that increases sympathetic activity, like anxiety.

这通常发生于心房细胞受到激惹和应激时，原因可能包括电解质紊乱、使用可卡因或麻黄碱类药物、心肌梗死等缺血性损伤，或焦虑等增高交感神经活性的因素。