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Spectrophotometric analysis of myocardial oxygen metabolism in perfused rat hearts

, : Spectrophotometric analysis of myocardial oxygen metabolism in perfused rat hearts. Kokyu to Junkan. Respiration & Circulation 34(12): 1317-1323

Cardiac muscle contains myoglobin in cytosol and cytochromes in mitochondria, both of which participate in oxygen metabolism of the heart. The change of myoglobin oxygenation and of the oxidation-reduction state of cytochrome aa3 can be measured by spectrophotometric technique and used as optical indicators of both tissue oxygen concentration and energy state. We evaluated effects of 1) perfusion pressure, 2) catecholamines, 3) coronary vasodilators such as Ca-antagonist, prostaglandin (PGI2) on intracellular oxygenation and energy metabolism in perfused rat hearts. Results: 1) With Langendorff perfusion, the cardiac tissue became hypoxic (more than 50% of myoglobin was in deoxygenated state) at perfusion pressure below 30 cm H2O. This result may indicate the functional obstruction in capillary microcirculation at low perfusion pressure. 2) Infusion of epinephrine (5 .mu.g/30 sec.) under normoxic perfusion conditions, increased cardiac work and lactate release. More than 50% of myoglobin was then deoxygenated and cardiac tissue was severely hypoxic. The increase in lactate release was explained by the enhancement of glycolytic flux in tissue hypoxia. On the other hand, dopamine infusion (50 .mu.g/30 sec.) also increased cardiac work at the same degree, but did not alter lactate release. Myoglobin oxygen saturation (MbO 2S) was kept at normoxic level (MbO2S > 80%) and no tissue hypoxia was observed. 3) During mild hypoxic perfusion conditions (MbO-2S .**GRAPHIC**. 55%), diltiazem (Ca-antagonist) infusion cause dose-dependent increases in coronary flow and intracellular oxygen concentration suggesting that diltiazem improved myocardial hypoxia. 4) Under hypoxic perfusion (MbO2S .**GRAPHIC**. 70%), infusion of prostaglandin I2 increased coronary flow and oxygen concentration at the coronary sinus. The myoglobin oxygen level shifted to more oxygenated state (normoxic condition). Thus, PGI2 was concluded to act effectively in delivering oxygen into the cardiac tissue and to improve myocardial oxygen metabolism. Conclusion: Our spectrophotometric technique is quite useful to permit continuous monitoring of oxygen metabolism and biochemical reactions taking place in cytosol and mitochondria.

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Accession: 006460184

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