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J Rheumatol. 1992 Jan;19(1):104-9.

Platelet 3H-imipramine uptake receptor density and serum serotonin levels in patients with fibromyalgia/fibrositis syndrome.

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  • 1Department of Medicine, University of Texas Health Science Center, San Antonio 78284-7874.


The density of serotonin reuptake receptors on peripheral platelets from 22 patients with primary fibromyalgia syndrome (FS) and the serum serotonin concentrations in 9 patients with FS were compared with those of matched healthy controls. The mean serum serotonin concentration was lower (p = 0.01) in FS than in controls, while the binding of 3H-imipramine was higher (p = 0.035) and normalized with treatment using a combination of ibuprofen and alprazolam. Improvement in selected clinical measures of FS disease activity during treatment correlated with the change in platelet 3H-imipramine binding. These findings support the proposed hypothesis of aberrant pain perception in FS resulting from a deficiency of serotonin.

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