Temperature, Hematocrit, pH, and Glucose 4-Way ANOVA of Cytochrome C Oxidase Redox Status During Systemic Cold Circulatory Arrest in Swine
| Autor: | Jacques G. LeBlanc, Faith A. Gagnon, Andrew J. Macnab, Roy E. Gagnon |
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| Rok vydání: | 2005 |
| Předmět: |
Blood Glucose
medicine.medical_specialty Cytochrome Cell Respiration Sus scrofa Ischemia Hematocrit Biochemistry law.invention Electron Transport Complex IV Cellular and Molecular Neuroscience Hypothermia Induced law Internal medicine medicine Cardiopulmonary bypass Animals Cytochrome c oxidase Cardiopulmonary Bypass Spectroscopy Near-Infrared medicine.diagnostic_test biology Chemistry Temperature Oxygenation Hydrogen-Ion Concentration Hypothermia medicine.disease Mitochondria Endocrinology Cerebrovascular Circulation Hypoxia-Ischemia Brain Circulatory system Heart Arrest Induced biology.protein Neurology (clinical) medicine.symptom Energy Metabolism Oxidation-Reduction |
| Zdroj: | Metabolic Brain Disease. 20:105-113 |
| ISSN: | 1573-7365 0885-7490 |
| Popis: | Various investigators using near infrared spectroscopy (NIRS) have reported differing patterns of cytochrome C oxidase (cytochrome a,a3) redox status in similar brain oxygenation studies. We investigated whether distinctive differences could be due to combinations of variations in temperature, hematocrit, pH, and glucose. Methods: Thirty-six healthy 10 kg commercial juvenile swine on cardiopulmonary bypass underwent 2–8 sequential periods of circulatory arrest. Prior to each arrest, key physiological variables were adjusted to match a random selection of one of 81 combinations of high, normal, or low levels of hypothermia, hematocrit, pH, and serum glucose. In the course of the study, the combinations were repeated twice to yield 162 NIRS data sets. Results: The mean rate of change in net oxidized minus reduced cytochrome a,a3 redox status in the brain following 7.5 min of ischemia was 0.49 ± 0.26 μmol L−1 min−1, and, the corresponding mean magnitude of change was −1.23 ± 0.57 μmol L−1. The rate of change was influenced by temperature but not by hematocrit, pH, or glucose, either singly or in combination. Conclusion: The respiratory response in mitochondria during systemic circulatory arrest is significantly influenced by temperature. |
| Databáze: | OpenAIRE |
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