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. 1978 Mar;75(3):392-9.

Hypothalamo-pituitary-thyroid axis function during cardiopulmonary bypass

  • PMID: 416303

Hypothalamo-pituitary-thyroid axis function during cardiopulmonary bypass

W F Bremner et al. J Thorac Cardiovasc Surg. 1978 Mar.

Abstract

Marked alterations in levels of circulating thyroid hormone were found in patients undergoing cardiopulmonary bypass with a rise in the free thyroxine and a fall in the free triiodothyronine levels. Studies using thyrotropin-releasing hormone during bypass demonstrated a blunted response to this stimulus. This reduced response is related to changes in thyroid hormone levels and it is suggested that bypass surgery may have a direct inhibitory action on thyroid-stimulating hormone release at the hypothalamo-pituitary level. The potential significance of these hormonal changes is discussed.

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