Experience with nifekalant hydrochloride in a patient with ischemic cardiomyopathy and severe ventricular dysfunction after dor operation.

Abstract

A 52-year-old male with ischemic cardiomyopathy and severe ventricular dysfunction underwent coronary artery bypass grafting and left ventricular reconstruction (Dor operation). The patient developed acute onset of incessant ventricular tachycardia in the early postoperative period that was refractory to therapy with class I antiarrhythmic agents, and multiple attempts at electrical cardioversion were required. A combination of intravenous nifekalant hydrochloride and enteral amiodarone was elected as treatment for this recurrent incessant ventricular tachycardia. Nifekalant hydrochloride was administered as a loading dose (0.3 mg/kg/5 min), followed by an intravenous infusion (0.4 mg/kg/hr). Several days after initiating therapy, the patient no longer experienced episodes of ventricular tachycardia, and there was no compromise in hemodynamics. We conclude that nifekalant hydrochloride is a useful agent for suppression of ventricular tachycardia in patients with severe left ventricular dysfunction, especially during the early postoperative period.