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[Study of serum thyroid hormone levels changes in perioperation patients accepted coronary artery bypass grafts]

Xin Li1, Huai-Bin Wang, Zhi-Ming Yao

  • 1Department of Nuclear Medicine, Beijing Hospital, China Ministry of Health, Beijing 100730, China.

Zhonghua Yi Xue Za Zhi
|February 9, 2010
PubMed

Insights

Thyroid hormone levels fluctuate around coronary artery bypass graft (CABG) surgery. Immediate post-surgery, total thyroxine (TT4) and free thyroxine (FT4) increase, while triiodothyronine (T3) and free triiodothyronine (FT3) decrease significantly, potentially indicating poor outcomes.

Area of Science:

  • Cardiology
  • Endocrinology
  • Surgical Science

Context:

  • Coronary artery bypass graft (CABG) surgery is a major cardiovascular intervention.
  • Thyroid hormones play a crucial role in metabolic regulation and cardiovascular function.
  • Understanding perioperative thyroid hormone dynamics is essential for patient management.

Purpose:

  • To investigate the dynamic changes in serum thyroid hormone levels during the perioperative period of CABG.
  • To correlate these hormonal changes with surgical events and patient outcomes.

Summary:

  • Serum thyroid hormone levels (TT3, TT4, FT3, FT4, TSH, rT3) were measured in 62 CABG patients and 30 controls.
  • Immediately after heparin administration during surgery, TT4 and FT4 levels significantly increased.
  • Postoperatively, TT3, FT3, TT4, FT4, and TSH levels decreased significantly, with T3 and FT3 showing substantial reductions (52.7% and 46.6% at 24h).
  • Reverse T3 (rT3) levels increased significantly at 24 hours post-CABG.
  • Thyroid hormone levels did not normalize by 7 days post-surgery.

Impact:

  • The study highlights significant perioperative thyroid hormone alterations in CABG patients.
  • Elevated TT4 and FT4 in the acute phase and decreased T3/FT3 post-CABG may serve as predictive markers.
  • These findings can inform clinical monitoring and therapeutic strategies for CABG patients.
Abstract

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