naloxone pretreatment ( 1.0 , 3.0 and 10.0 mg/kg i.v . ) failed to protect anesthetized pigs from cardiac arrhythmias including ventricular fibrillation ( vf ) and death following acute occlusion ( 20 min ) or reperfusion of the left anterior descending coronary artery .
C0003811
cardiac arrhythmias
C0042510
ventricular fibrillation