Acute Ethanol-Induced Changes in Edema and Metabolite Concentrations in Rat Brain

The aim of this study is to describe the acute effects of EtOH on brain edema and cerebral metabolites, using diffusion weight imaging (DWI) and proton magnetic resonance spectroscopy ((1)H-MRS) at a 7.0T MR and to define changes in apparent diffusion coefficient (ADC) values and the concentration of metabolites in the rat brain after acute EtOH intoxication. ADC values in each ROI decreased significantly at 1 h and 3 h after ethanol administration. ADC values in frontal lobe were decreased significantly compared with other regions at 3 h. For EtOH/Cr+PCr and cerebral metabolites (Cho, Tau, and Glu) differing over time, no significant differences for Ins, NAA, and Cr were observed in frontal lobes. Regression analysis revealed a significant association between TS(EtOH/Cr+PCr )and TS(Cho), TS(Tau), TS(Glu), and TS(ADC). The changes of ADC values in different brain regions reflect the process of the cytotoxic edema in vivo. The characterization of frontal lobes metabolites changes and the correlations between TS(EtOH/Cr+PCr )and TS(Cho), TS(Tau), and TS(Glu) provide a better understanding for the biological mechanisms in neurotoxic effects of EtOH on the brain. In addition, the correlations between TS(EtOH/Cr+PCr) and TS(ADC) will help us to understand development of the ethanol-induced brain cytotoxic edema.