RESUMO
Experimental studies on the myocardial ischemia and reperfusion injury in 16 anaethetized SDrats,of which,8 animals were pretreated with morphine(5 mg/kg,i.p.)for preventing of arrhyth-mias,were studied immunocytochemically with anti-muscle actin specific monoclonal antibody (HHF_(35)),8 shan-operated rats were used as control.With HHF_(35) ABC immunocytochemical method,the area of myocardial ischemia and reperfusion injury(without morphine)showed decrease or ab-sence of staining,large areas of staining loss were also seen.In the group with morphine,only smallfoci of staining absence were shown.The myocardium in control animals showed evenly positive stain-ing.No change were seen with HE staining in all groups.The results obtained with HHF_(35) stainingsupport its important value in studying on myocardic reperfusion injury,and indicated that the degreeof myocardic damage may be relative to the arrhythmias in myocardial reperfusion injury.