Early Enteral Levothyroxine as Rescue Therapy in Cardiac Surgery Patients With Delayed Neurologic Recovery: A...

Area of Science:

• Cardiology
• Endocrinology
• Critical Care Medicine

Background:

• Delayed neurologic and respiratory recovery is a significant complication in adult patients following on-pump cardiac surgery.
• Thyroid hormone plays a crucial role in metabolic regulation and cellular function, potentially influencing recovery post-surgery.

Purpose of the Study:

• To assess the efficacy and safety of early enteral levothyroxine as rescue therapy for delayed recovery after cardiac surgery.
• To evaluate the impact of levothyroxine on neurologic status, cardiac function, and mortality in this patient population.

Main Methods:

• A single-center, randomized, double-blind, placebo-controlled trial involving 70 adult patients with delayed recovery post-cardiac surgery.
• Patients received either enteral levothyroxine or placebo from postoperative day 2 until ICU discharge, with outcomes assessed including Glasgow Coma Scale (GCS) score, cardiac function, and mortality.

Main Results:

• The levothyroxine group demonstrated significantly accelerated neurologic recovery (increased GCS score) and improved cardiac function (attenuated ejection fraction decline).
• Levothyroxine administration was associated with reduced catecholamine requirements and a potentially lower 30-day mortality rate (exploratory finding).
• Thyroid hormone levels were normalized, with a correlation between increased free triiodothyronine and GCS score improvement.

Conclusions:

• Early enteral levothyroxine administration can significantly enhance neurologic recovery and cardiac function in cardiac surgery patients experiencing delayed postoperative recovery.
• The observed reduction in 30-day mortality warrants further investigation in larger trials.
• These findings suggest a potential role for thyroid hormone replacement in perioperative care for high-risk surgical patients.