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The effect of LC-80 on infarct size induced by 6 hr coronary occlusion was studied in anesthetized dogs. LC-80 at a dose of 100 mg/kg, i.v. was injected 5 min after coronary occlusion and then infused at a rate of 50 mg/kg, i.v./hr until the heart was excised. The two risk areas were determined both by injecting a fluorescent dye (Thioflavin S) into the left atrium (in vivo) and by perfusing the non-occluded coronary bed with Monastral Blue (in vitro). The infarct size was determined by topographically tracing the area of myocardium unstained by triphenyltetrazolium chloride. Four zones such as Zone 1 (normal tissue), Zone 2 (tissue characterized by collateral blood flow), Zone 3a (tissue developing necrosis), Zone 3b (necrotic tissue) were delimited . As a result, (1) LC-80 significantly diminished the incidence of ventricular arrhythmias. (2) LC-80 significantly inhibited the decrease in myocardial free carnitine level in Zone 2 and Zone 3b. (3) LC-80 significantly reduced the infarct size expressed as a percentage of the risk area and increased the size of Zone 2. (4) In the electron microscopic findings, LC-80 showed lesser morphological changes such as swollen mitochondria and intracellular and extracellular edema, especially in Zone 2. (5) LC-80 may be useful for inhibiting the evolution of myocardial ischemic cell death both by the protection of ischemic myocardium and presumably by the increase in the collateral blood flow.

Limitation of experimental infarct size by levocarnitine chloride(LC-80), a new mitochondrial function-reactivating agent.