Tricyclic antidepressants (TCA) are sodium channel blockers that may result in prolongation of entricular conduction (increases the PR and QT interals) and ultimately monomorphic T (3).

• 三环抗抑郁药（TCA）为钠通道阻滞剂，可导致心室传导的延长（增加PR和QT间期）与最终单一型T[3]。