QT Independent Ventricular Tachycardia Induced by Arsenic Trioxide.

Arsenic trioxide (ATO) is commonly known to cause QT prolongation with resultant ventricular tachycardia (VT). VT, independent of QT prolongation, can be a complication of ATO. We present a 46-year-old female who received ATO and during her hospital course had intermittent nonsustained VT. All usual causes of VT were considered including reduced EF < 35%, ischemia, electrolyte abnormalities, medications, and genetic polymorphisms; however, no specific cause was found. After stopping therapy, the episodes of nonsustained VT ceased indicating that there is an association between ATO and VT.