Abstract
A decreased thyroid stimulating hormone (TSH) response to thyrotropin releasing hormone (TRH) has been noted in major depression. Some authors found a positive correlation between baseline TSH levels and TSH response to TRH, especially with sensitive assays of TSH. Serum TSH was assayed by a sensitive method in 55 depressed patients and 38 healthy volunteers. Patients were subclassified according to DSM-III as suffering from major depression ( n = 40) and non-major depression ( n = 15). The patients' mean score on the Hamilton Rating Scale for Depression (HRSD) was 50 (SD = 10). The TSH value was significantly lower in depressed patients compared with healthy control subjects, and in major compared with non-major depression. No differences in TSH levels distinguished the various subtypes of major depression. There was a significant negative correlation between global HRSD scores and TSH concentrations. The most anxious patients tended to have significantly lower TSH values compared with the least anxious subjects. Total HRSD insomnia scores correlated negatively with TSH concentrations after log transformation. The sensitive determination of TSH may also provide an index of thyroid function in depression that is simpler to implement than measurements of the TSH response to TRH.
Published Version
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