Synchronized cardioversion is done for Polymorphic ventricular tachycardia Sustained (≥ 30 seconds) monomorphic ventricular tachycardia Any ventricular tachycardia with symptoms of instability (eg, heart failure, hypotension, chest pain) Ventricular tachycardia without hemodynamic instability may be treated with IV lidocaine, procainamide, or amiodarone.