Electrophysiologic effects of carbochromene in man.

Sinoatrial and atrioventricular node functions were evaluated by the electrode catheter method in 13 patients with coronary artery disease before and 10 min after the i.v. infusion of 80 mg carbochromene. The drug had no effects on sinus node automatism, lengthened the atrial functional refractory period, and restored a 1 : 1 AV conduction at the same atrial rates at which a Wenckebach phenomenon occurred. These effects on atrial functional refractory period and AV conduction may be useful in the treatment of patients with coronary artery disease who present atrial or junctional arrhythmias.