Thyroidectomy for Feline Hyperthyroidism: Welfare Guide

Key Welfare Considerations

• Thyroidectomy removes the hyperfunctional thyroid adenoma, providing permanent welfare cure in appropriate cases.
• Patient selection is critical — cardiac and renal welfare status must be assessed before surgery.
• Pre-surgical methimazole treatment for 2-4 weeks stabilises cardiovascular welfare status before anaesthesia.
• Bilateral thyroid adenomas (20-30% of cases) require bilateral thyroidectomy for welfare cure.
• Unilateral thyroidectomy leaving healthy contralateral tissue avoids hypocalcaemia welfare risk.
• Parathyroid gland preservation during thyroidectomy prevents postoperative hypocalcaemia welfare emergency.
• Hypocalcaemia from parathyroid damage causes welfare tetany, seizures, and facial rubbing signs.
• Oral calcium and vitamin D supplementation corrects post-surgical hypocalcaemia welfare.
• Post-surgical monitoring for hypocalcaemia welfare signs requires 48-72 hour hospitalisation.
• Hypothyroidism can develop post-bilaterally — lifelong thyroxine welfare supplementation is required.
• Renal disease may emerge post-surgery as hyperthyroidism masked renal welfare impairment is revealed.
• Gradual T4 normalisation through pre-surgical methimazole identifies cats at renal welfare risk before permanent intervention.
• Surgical thyroidectomy welfare success rate exceeds 90% in appropriately selected patients.
• Recurrence from ectopic thyroid tissue is uncommon but possible — welfare monitoring continues long-term.
• Compared to radioiodine, surgery is more accessible but carries anaesthetic and parathyroid welfare risks.