Risk for alcoholism: a comparison between two different groups of sons of alcoholics on cardiovascular reactivity and sensitivity to alcohol.

Two groups of sons of alcoholic fathers of differing family pedigrees for alcoholism [multigenerational (MGH) versus unigenerational (UGH)] were compared on measures of cardiovascular reactivity to unavoidable shock under alcohol and no alcohol consumption conditions. The MGH subjects were significantly more reactive than UGH subjects to the shock procedure on a measure of peripheral vasoconstriction (digital blood volume amplitude) with a similar trend on heart rate. The MGH subjects were significantly more sensitive to the reactivity dampening effects of alcohol than the UGH subjects on both cardiovascular measures. MGH subjects were also significantly more alexithymic than UGH subjects. The results are discussed in terms of the potential etiological significance of these characteristics in MGH males, and the importance of delineating the family history for at least two generations when assigning risk status to potential subjects.