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Related Experiment Videos

Thyroid function during isoflurane anesthesia and valvular heart surgery.

W M Ho1, Y S Wang, C T Tsou

  • 1Department of Surgery, Veterans General Hospital, Taichung, Taiwan, Republic of China.

Journal of Cardiothoracic Anesthesia
|October 1, 1989
PubMed
Summary
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Valve surgery under isoflurane-O2 anesthesia significantly alters thyroid hormone levels, causing a postoperative low triiodothyronine (T3) syndrome. Cortisol levels also fluctuate during this surgical stress response.

Area of Science:

  • Endocrinology
  • Cardiovascular Surgery
  • Anesthesiology

Background:

  • Thyroid hormones are critical for cardiovascular function, especially during physiological stress.
  • Anesthesia and surgical procedures, like valve surgery, can impact endocrine function.

Purpose of the Study:

  • To investigate the effects of isoflurane-O2 anesthesia and surgical stress on thyroid hormones (TSH, T4, free T4, T3, rT3) and cortisol.
  • To analyze these hormonal changes in patients undergoing valve surgery before, during, and after the procedure.

Main Methods:

  • Serum levels of TSH, T4, free T4, T3, rT3, and cortisol were measured in nine patients.
  • Measurements were taken preoperatively, during anesthesia and surgery, and postoperatively, including during cardiopulmonary bypass (CPB).

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Main Results:

  • Postoperative TSH decreased. T4 and free T4 decreased after CPB and remained low. T3 decreased at CPB onset and stayed low postoperatively.
  • rT3 decreased at CPB onset but increased during and after CPB. Cortisol decreased pre-CPB but increased during and post-CPB.
  • Isoflurane-O2 anesthesia led to a rapid decrease in T3, suggesting a postoperative low T3 syndrome.

Conclusions:

  • Isoflurane-O2 anesthesia during valve surgery induces a low T3 syndrome postoperatively.
  • The anesthetic agent can suppress cortisol response pre-CPB but not during or after CPB.
  • Thyroid hormone and cortisol dynamics are significantly altered by valve surgery and anesthesia.