A geriatric patient is an old case of COPD and old known case of prolonged QTc. In ICU he's given inj vancomycin for his persistent infection and inj amiodarone for his atrial fibrillation. Subsequently, he developed Torsades de pointes syndrome. Which medicine could have caused it? 1.

Digoxin 2. Amiodarone 3. Vancomycin 4. Salbutamol Answer. Amiodarone can convert QTc into Polymorphic Ventricular Tachycardia.