Cardiovascular surgery in the hypothyroid patient

Area of Science:

• Cardiology
• Endocrinology

Background:

• Management of hypothyroid patients undergoing major cardiovascular surgery is challenging.
• Hypothyroidism can complicate cardiac procedures, leading to controversy regarding surgical readiness.

Purpose of the Study:

• To evaluate the safety of major cardiovascular surgery in patients with previously undiagnosed mild to moderate hypothyroidism.
• To determine if hypothyroidism is an absolute contraindication for coronary artery bypass surgery.

Main Methods:

• Prospective study of 500 patients undergoing cardiac surgery with cardiopulmonary bypass.
• Inclusion of ten patients with newly diagnosed mild to moderate hypothyroidism.
• Review of clinical practice for five additional similar patients.

Main Results:

• All ten patients with undiagnosed hypothyroidism tolerated major cardiovascular surgery well.
• No preoperative thyroid hormone replacement was required for these patients.
• Clinical experience supports the safety of surgery in mild to moderate hypothyroidism.

Conclusions:

• Major cardiovascular surgery can be safely performed in most patients with mild to moderate hypothyroidism.
• Untreated hypothyroidism should not be an absolute contraindication for coronary artery bypass surgery in patients with ischemic heart disease.