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Selective parathyroidectomy of the dog
D R Finco1, S A Brown, D C Ferguson
1Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens 30602.
Summary
Selective parathyroidectomy (PTX) is achievable in dogs, preserving sufficient thyroid tissue to maintain euthyroidism. This surgical approach avoids thyroxine depletion often seen with thyroparathyroidectomy (TPTX).
Area of Science:
- Veterinary Surgery
- Endocrinology
Background:
- Thyroparathyroidectomy (TPTX) often results in thyroxine (T4) and calcitonin depletion due to the proximity of thyroid and parathyroid glands.
- Selective parathyroidectomy (PTX) is preferred for studying parathyroid hormone (PTH) effects but can be technically challenging.
Purpose of the Study:
- To evaluate the feasibility of selective PTX in dogs.
- To determine if sufficient thyroid tissue can be spared during selective PTX to maintain euthyroidism.
Main Methods:
- Six normal dogs underwent removal of parathyroid tissue and approximately seven-eighths of thyroid tissue.
- Five dogs with reduced renal mass had selective PTX with at least one-half of the thyroid tissue spared.
Main Results:
- Dogs undergoing extensive thyroid resection (seven-eighths) showed inadequate serum T4 concentrations even after 168 days.
- Dogs with reduced renal mass and selective PTX, sparing at least one-half of the thyroid, maintained normal serum T4 concentrations at 28 days.
Conclusions:
- Selective PTX can be successfully performed in a high percentage of dogs with careful surgical technique.
- Sufficient thyroid tissue can be preserved during selective PTX to maintain normal thyroid hormone levels and euthyroidism.