Abstract
The mechanism of the antidepressant action of electroconvulsive therapy (ECT) remains unknown. Based on previous work with antidepressant drugs and their effects on the noradrenergic system, we undertook this study to further determine the effects of ECT on selected indices of peripheral adrenoceptor function in depressed patients. Binding parameters (Bmax and Kd) of platelet alpha 2- and leukocyte beta 2-adrenoceptors, plasma noradrenaline (NA), 3-methoxy-4-hydroxy-phenylglycol (MHPG) and cortisol levels were determined in 18 patients, prior to treatment and 14 days after the last of a series of ECTs, and compared with samples obtained from 18 matched control subjects. Platelet alpha 2-adrenoceptor sites were significantly elevated in untreated patients compared with controls (P < 0.03), but leukocyte beta 2-adrenoceptor numbers did not differ. Treatment with ECT led to a significant reduction in platelet alpha 2-adrenoceptor numbers, whereas leukocyte beta 2-adrenoceptor densities increased. Pre-ECT plasma NA, MHPG, and cortisol levels were elevated in patients, compared with controls, and decreased following ECT, but these differences were not statistically significant. Post-ECT plasma NA and beta 2-adrenoceptor numbers were...Continue Reading
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