the degree of myocardial damage produced in rats by exposing them to unsignalled , irregular foot-shock stress was determined in three ways : by measuring ( 1 ) enzymes ( ldh , got and gpt ) released into the circulation , ( 2 ) the rate of release of one of these enzymes ( ldh ) from isolated perfused hearts into the perfusate , and ( 3 ) the cardiac uptake , in vivo , of the radioactively labeled bone-seeking agents , technetium-99m-stannous pyrophosphate or technetium-99m-methylene diphosphonate .
C0027061
myocardial
C0018787
cardiac