Low TRH-TSH Responses in Human Essential Hypertension

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Abstract
Thirty female and male essential hypertensive patients and eighteen normotensive controls were submitted to the TRH-TSH conventional test (200 .mu.g intravenously, bolus injection of TRH). Supramaximal doses of 400 and 600 .mu.g were repeated with a week interval to each subject. Hypertensives showed a significant lower response to both conventional and supramaximal TRH doses. Hypothalamic-pituitary-thyroid axis abnormalities, secondary to TRH-receptor alterations, could account for this result.