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Effects of thyrotropin-releasing hormone on regional cerebral blood flow in man

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To assess the regional changes in cerebral blood flow, 10 healthy volunteers were given 400 micrograms thyrotropin-releasing hormone iv in a double-blind, randomized, cross-over study. Regional cerebral blood flow was determined simultaneously in two slices of the brain, using a single photon emission computerized tomograph and inhalation of 133Xe. Thyrotropin-releasing hormone caused a significant mean increase of 3.7% (range -8.8-22.7) in blood flow in a region consistent with the left thalamus compared to placebo (3.2% decrease). In 25 other regions no significant change was detected. The thalamic region has previously been shown to be a region especially affected by thyrotropin-releasing hormone in animal studies. The thyrotropin-releasing hormone injection was followed by a minor rise in systemic blood pressure, but not a rise that could affect the cerebral blood flow. The effect of thyrotropin-releasing hormone on the regional cerebral blood flow in the thalamic region was much lower compared to changes found in sedated animals given a hundredfold higher dose of thyrotropin-releasing hormone.

Original languageEnglish
JournalActa Endocrinologica (Copenh)
Volume126
Issue number3
Pages (from-to)243-6
Number of pages4
ISSN0001-5598
Publication statusPublished - Mar 1992

    Research areas

  • Adult, Blood Pressure, Cerebrovascular Circulation, Diastole, Humans, Male, Thyrotropin-Releasing Hormone

ID: 44347573