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Thyroid hormone and cardiac surgery.
1Division of Cardiovascular Surgery, Eastern Maine Medical Center, Bangor, Maine, USA. jklemperer@nehi.org
Summary
Triiodothyronine (T3) supplementation safely reverses low T3 levels during cardiac surgery. While T3 may improve hemodynamics and reduce arrhythmias, large trials are needed to confirm benefits on major clinical outcomes.
Area of Science:
- Cardiology
- Endocrinology
- Cardiovascular Surgery
Background:
- Thyroid hormone significantly impacts cardiovascular function.
- Low serum triiodothyronine (T3) levels are linked to cardiovascular illnesses and perioperative dysfunction, particularly after cardiopulmonary bypass.
- T3 exhibits acute positive inotropic and vasodilator effects.
Purpose of the Study:
- To review the experimental basis for T3 administration in cardiac surgery patients.
- To outline clinical trial results on T3 supplementation in adult and pediatric cardiac surgery.
Main Methods:
- Review of experimental data supporting T3 administration.
- Analysis of documented results from clinical trials in adult and pediatric cardiac surgery patients.
Main Results:
- Pharmacologic T3 supplementation safely reverses low T3 levels caused by cardiopulmonary bypass.
- Preliminary data suggest T3 repletion may enhance postoperative hemodynamic performance and decrease arrhythmia incidence.
- Conclusive evidence for improved major clinical outcomes is currently lacking.
Conclusions:
- Perioperative T3 supplementation is safe and effectively normalizes low T3 levels post-cardiac surgery.
- Further large-scale clinical trials are necessary to definitively establish the benefits of T3 repletion on major clinical outcomes in cardiac surgery patients.