- Effects of mibefradil, a novel calcium channel blocking agent with T-type activity, in acute experimental myocardial ischemia: maintenance of ventricular fibrillation threshold without inotropic compromise. Muller, C.A., Opie, L.H., McCarthy, J., Hofmann, D., Pineda, C.A., Peisach, M. J. Am. Coll. Cardiol. (1998)