two to 6.5 ( average = 4.2 ) hours later , the hearts were excised , the area at risk ( myocardium perfused by the lad ) was outlined by injection of fluorescent microspheres , and the myocardial infarct was demonstrated by the nitro blue tetrazolium ( nbt ) gross histochemical method .
C0018787
hearts
C0027051
myocardial infarct