Tricyclic antidepressants (TCA) are sodium channel blockers that may result in prolongation of ventricular conduction (increases the PR and QT intervals) and ultimately monomorphic VT (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VT[3]。