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A dog model of torsades de pointes (TdP) was developed. Twenty 18-30-kg dogs had cardiopulmonary bypass instituted to maintain stable temperature, perfusion pressure and oxygenation. Quinidine, 30 mg/kg, was then administered and burst ventricular pacing was used to induce arrhythmias. The left anterior descending coronary artery was occluded for 15 minutes and repeat pacing studies were performed. Maps of epicardial activation were made from 27 simultaneously recorded electrograms obtaineddoi:10.1161/01.cir.67.1.52 pmid:6847804 fatcat:v32l5yredbgoje6uzr26ng6pbu