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Differential effects of ethanol concentration on blood pH, PCO2 and PO2 in LS and SS Mice☆

乙醇 二氧化碳 呼吸 化学 催眠药 内分泌学 内科学 呼吸速率 呼吸系统 腹腔注射 剂量-反应关系 麻醉 生物化学 医学 解剖
作者
David M. Gilliam,Allan C. Collins
出处
期刊:Physiology & Behavior [Elsevier BV]
卷期号:30 (2): 295-300 被引量:14
标识
DOI:10.1016/0031-9384(83)90022-7
摘要

Concentration-dependent effects of ethanol upon behavior and upon physiological regulatory mechanisms have been suggested. In a previous study, we found that the concentration of an acute ethanol injection confounded dose-response relationships for measures of blood pH, PCO2, and PO2. Two lines of mice that differ in CNS sensitivity to the hypnotic effects of ethanol (long sleep, LS; short sleep, SS) have also been found to differ in sensitivity to the physiological depressant effects of this drug. Therefore, we designed the present study to examine how intraperitoneal (IP) injections of varying ethanol concentrations differentially affect blood parameters (pH, PCO2, and PO2) and respiration rate in the LS and SS mouse lines. Different groups of LS female mice were injected IP with 165.0, 198.8, 248.1, or 330.0 mg/ml ethanol at a constant dose of 3.3 g/kg. Groups of SS female mice recieved 205.0, 247.0, 308.3, or 410.0 mg/ml ethanol at a dose of 4.1 g/kg. Blood parameters and respiration rate were measured at 60 min post-injection. In both the LS and SS mice, increasing concentrations of ethanol caused a progressive decline in respiration rate and blood pH. Blood PCO2 values were greater than control only at the highest ethanol concentration. Concentration-dependent effects of ethanol on blood PO2 values were not found in either line. However, LS PO2 was significantly elevated from the control value at all ethanol concentrations. These results suggest that a dose-response relationship may be obtained by varying ethanol concentration for some physiological measures, but not for others. Thus, attention should be paid to differences in concentration as well as amount of ethanol when dose-response curves are to be constructed.
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