Table 1.

Differential diagnosis between Torsade de Pointes and true polymorphic ventricular tachycardia/polymorphous ventricular tachycardia.

	Torsade de Pointes (TdP)	True polymorphic ventricular tachycardia (PVT)
Etiology	Congenital or acquired	Congenital or acquired
Related to Sinus Bradycardia	Yes	No
Pauses prior to events	Yes	No
Electrolytic Disorders	Frequent	No
Coupling of the first triggering PVC	Delayed or telediastolic. Very rarely short coupled variant is observed [16]	Initiated by closely coupled beats
QT/QTc interval	Prolonged rare normal	Normal [17]
U wave	Frequent great voltage	Normal voltage