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• W2124102457 abstract "Oxygen deficiency during critical illness may cause profound changes in cellular metabolism and subsequent tissue and organ dysfunction. Clinical treatment in these cases targets rapid reoxygenation to avoid a prolonged impaired synthesis of cellular high-energy phosphates (ATP). However, the effect of this therapeutic intervention on tissue metabolism has not been determined yet. Thus the present study was designed to determine the effects of hypoxia and reoxygenation with either room air or 100% oxygen on variables of interstitial metabolism in different tissues using in vivo microdialysis. Twenty-seven adult, male CD-rats (407–487 g; Ivanovas, Kisslegg, Germany) were studied during general anesthesia. Following preparation and randomization, rats were normoventilated for 45 min (FiO2 0.21), followed by induction of hypoxia (FiO2 0.1, 40 min) and reoxygenated for 50 min either with FiO2 1.0 (group 1, n=10) or FiO2 0.21 (group 2, n=10). Control animals (n=7) were ventilated with 21% oxygen during the observation period. Additional to invasive haemodynamic parameters, biochemical tissue monitoring was performed using CMA 20 microdialysis probes, inserted into muscle, subcutaneous space, liver, and the peritoneal cavity allowing analyses of lactate and pyruvate at short intervals. Hypoxia induced a significant reduction in mean arterial pressure (MAP) in group 1 and 2 compared with the control group (P<0.05) without any significant differences between both treatment groups. This was accompanied by a significant increase in blood lactate (10.5±3.1 mM (group 1) and 12.3±4.1 mM (group 2) vs. 1.5±0.3 mM (control); P<0.05) and severe metabolic acidosis (base excess (BE): −18.3±5 mM (1) and −17.3±7 mM (2) vs. −2.6±1.8 mM (control), P<0.05). During hypoxia, the interstitital lacate/pyruvate ratio in groups 1 and 2 increased to 455±199% (muscle), 468±148% (intraperitoneal), 770±218% (hepatic) and 855±432% (subcutaneous) (P<0.05 vs. control, respectively). No significant inter-organ or inter-group differences in interstitial dialysates were observed in the treatment groups, neither during hypoxia nor during reoxygenation. Our data suggest, that hypoxia induces comparable metabolic alterations in various tissues and that reoxygenation with 100% oxygen is not superior to 21% oxygen in restoring tissue metabolism after critical hypoxia." @default.
• W2124102457 created "2016-06-24" @default.
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• W2124102457 date "2003-03-01" @default.
• W2124102457 modified "2023-09-25" @default.
• W2124102457 title "Biochemical tissue monitoring during hypoxia and reoxygenation" @default.
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• W2124102457 doi "https://doi.org/10.1016/s0300-9572(02)00342-8" @default.
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