Answer
Arsenic trioxide can prolong the QT interval and, rarely, cause life-threatening abnormal heart rhythms. ECG and electrolyte monitoring help identify and reduce this risk.
Sources for this answer
- Trisenox (arsenic trioxide) 2mg/ml Concentrate for Solution for Infusion — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.