Abstract
Rats were maintained on liquid diets as their sole source of calories and fluid for 10, 15, 20 and 30 days. The diets consisted of 35–40% of total calories in the form of ethanol. This procedure resulted in substantial ethanol intake leading to behavioral intoxication. Blood ethanol concentrations were found to be elevated throughout the day with a peak during the dark phase of the light cycle. The removal of ethanol resulted in evidence of physiological dependence, including behavioral manifestation of autonomic and somatic dysfunction and an increased susceptibility to audiogenic convulsions. Ten days of ethanol exposure was found to be sufficient for the reliable induction of ethanol dependence. Further increases in ethanol exposure resulted in increased hyperexcitability as measured by susceptibility to audiogenic convulsions. The severity of withdrawal behavior was found to be correlated with the blood ethanol concentration measured upon ethanol removal. A behavioral rating scale for the evaluation of alcohol withdrawal intensity in rats is described.
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