Abstract
Summary An ultrasonic instrument was used to measure continuously the changes in blood viscosity of 3 groups of experimental subjects. Group 1, 4 neurotic patients showing no overt anxiety, and Group 2, neurotic subjects showing overt anxiety, were subjected to a mild stress. No behavioral or physiological changes were noted in the first group. Behavioral evidence of increased anxiety was associated with the rise in blood viscosity in Group 2. Group 3, 6 psychotic subjects, were tested just prior to the administration of electroshock therapy; these subjects all showed intense anxiety. Significant blood viscosity increases were noted in this group. These findings were found to be consistent with previous studies of changes in blood coagulation in emotional stress. Pertinence of the results to further study of blood viscosity changes under emotional stress, especially in thromboembolic diseases, was suggested.
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