Effects of combined hypoxia and NaCN intoxication on the heart function of rats / 解放军医学杂志

ABSTRACT

Objective To approach the effects of combined plateau hypoxia due to high altitude and sodium cyanide(NaCN)intoxication on the heart function of rats.Methods 84 healthy male SD rats were randomly divided into 2 groupsonly NaCN intoxication in plain areas(altitude 308m)(PL group)and combined high altitude(altitude 4 000m)hypoxia and NaCN intoxication(PH group).Rats in PH group were pre-treated with hypoxia for 72h in a plateau hypoxia cabin(simulating altitude 4 000m).12 rats of PH group were anesthetized.NaCN in a dosage of 3.6mg/kg was subcutaneously injected into the back of rats.At the time points of-10min,0min,10min,20min,30min,40min,50min,60min and 90min after NaCN injection,the left ventricular systolic pressure(mLVSP),+dP/dtmax and heart rate(HR)were recorded by physiological functions signal processing system RM6240.The arterial blood were taken from the other 72 rats for myocardium zymogram detection(including AST,LDH,CK,CK-MB)at the time points of 0h,0.5h,1h,2h,4h and 6h after NaCN injection.Results Compared with the PL group,the mLVSP,+dP/dtmax,and HR changed obviously(P