Cat Hyperthyroidism Surgical Treatment

Surgical thyroidectomy offers a curative option for feline hyperthyroidism with specific welfare considerations during and after the procedure.

Key Facts

Bilateral thyroidectomy removes both thyroid lobes, permanently treating hyperthyroidism in most cases
Preservation of the parathyroid glands is critical to prevent hypocalcaemia, the main surgical complication
Success rate is approximately 95% for permanent cure with experienced surgical technique
Surgery carries anaesthetic risk in hyperthyroid cats - pre-operative medical stabilization reduces this
Post-operative hypocalcaemia monitoring for 2-3 weeks is essential after bilateral thyroidectomy
Surgery is less commonly performed than radioiodine or medical treatment but may suit specific cases

Welfare Considerations

Surgical thyroidectomy welfare considerations span the perioperative period and post-operative recovery. Hyperthyroid cats are anaesthetic risks due to cardiac compromise from chronic thyroid hormone excess - pre-operative methimazole stabilization for 4-6 weeks before surgery significantly reduces this risk. Accidental removal of all four parathyroid glands causes life-threatening hypocalcaemia within days of surgery, making surgical skill and immediate post-operative calcium monitoring critical welfare requirements. For cats in whom radioiodine is not accessible or feasible, well-performed bilateral thyroidectomy by an experienced surgeon provides cure with comparable welfare outcomes to radioiodine. Post-operative calcium supplementation if needed provides complete management of the main surgical complication.

What You Can Do

Stabilize hyperthyroid cats with methimazole for 4-6 weeks before surgery to reduce anaesthetic risk
Choose a surgeon experienced in feline thyroidectomy with parathyroid preservation technique
Monitor serum calcium for 2-3 weeks post-operatively and seek prompt treatment if hypocalcaemia develops
Watch for hypocalcaemia signs post-surgery: muscle trembling, face rubbing, seizures - seek emergency care immediately
Discuss radioiodine as an alternative when available, particularly for cats with concurrent kidney disease
Confirm cure at 1 month with repeat thyroid hormone measurement after recovery