this simple screening procedure produces severe cardiac arrhythmias , primarily ventricular fibrillation , in young post-weaning rats which have been pretreated with a single intramuscular injection of theophylline ( 20 mg/kg ) 15 to 45 min prior to their inhalation of chloroform vapors .
C0003811
cardiac arrhythmias
C0042510
ventricular fibrillation