Abstract
The authors evaluated the effects of verapamil (Ve) and magnesium sulfate (Mg) on the electrophysiologic changes induced in dogs during acute myocardial ischemia and following reperfusion. The effects of their intravenous (IV) administration and adminis tration by coronary sinus retroperfusion (CSR) were also compared. Sixty-five dogs were divided into five groups : Ve-IV: 9 dogs, 0.1 mg/kg; Ve-CS: 9 dogs, 0.05 mg/kg; Mg-IV: 12 dogs, 20 mg/kg; Mg-CS: 11 dogs, 10 mg/kg, control: 24 dogs. The left anterior descending coronary artery was ligated for ten minutes, then quickly reopened. The changes in ventricular effective refractory period (ERP) and intramyocardial conduction time (ICT) were determined during ischemia and following reperfusion.
The authors observed a shortening of the ERP and a prolongation of the ICT in the control group versus an attenuation of those effects in all other groups. The ERP was shortened to a lesser extent in the Mg-IV group than in the Ve-IV group. Drug adminis tration by CSR inhibited the changes in ERP and ICT to a greater extent than IV admin istration, even though the dose given by CSR was one-half the IV dose. Ventricular fibril lation (Vf) occurred in 12 of 24 dogs (50%) in the control group during ischemia, and in 5 of 12 dogs (41.7%) following reperfusion. Vf occurred during ischemia and following reperfusion, respectively, in 22.2% and 0% in the Ve-IV and Ve-CS groups, in 25% and 22.2% in the Mg-IV group, and in 9.1% and 10% in the Mg-CS group. Thus, verapamil and magnesium sulfate inhibited the electrophysiologic changes and prevented ventric ular arrhythmias during myocardial ischemia and following reperfusion.
Administering the antiarrhythmic agent by coronary sinus retroperfusion may be useful for treating patients with acute myocardial infarction with intractable arrhyth mias, according to these experimental results.
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