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Intraoperative parathyroid hormone concentration to confirm removal of hypersecretory parathyroid tissue and time to postoperative normocalcaemia in nine dogs with primary hyperparathyroidism
Author(s) -
Graham KJ,
Wilkinson M,
Culvenor J,
Dhand NK,
Churcher RK
Publication year - 2012
Publication title -
australian veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.382
H-Index - 59
eISSN - 1751-0813
pISSN - 0005-0423
DOI - 10.1111/j.1751-0813.2012.00918.x
Subject(s) - primary hyperparathyroidism , parathyroid hormone , parathyroidectomy , medicine , parathyroid adenoma , hyperparathyroidism , urology , adenoma , endocrinology , parathyroid gland , calcium , surgery
Objective To determine (1) whether the intraoperative parathyroid hormone concentration ([PTH]) during parathyroidectomy (PTX) can be used to indicate cure in dogs with primary hyperparathyroidism and (2) the time taken for postoperative serum calcium concentration to normalise. Design Retrospective study (2005–10) from a private referral hospital in Sydney, New South Wales, Australia. Procedure Nine client‐owned dogs underwent surgical PTX for naturally occurring primary hyperparathyroidism. [PTH] was measured from serum samples taken immediately post‐induction (pre‐PTX]) and at least 20 min after adenoma removal (post‐PTX) for all dogs, and during parathyroid gland manipulation (intra‐PTX) for six dogs. The concentration of ionised calcium (iCa) was measured at various time points postoperatively until it normalised, then stabilised or decreased below reference ranges. Statistical analysis compared the mean pre‐, intra‐ and post‐PTX [PTH] and the average rate of decline of iCa concentration postoperatively. Results All dogs demonstrated a significant decrease from mean pre‐PTX [PTH] (168.51 pg/mL) to mean post‐PTX [PTH] (29.20 pg/mL). There was a significant increase in mean intra‐PTX [PTH] (279.78 pg/mL). The average rate of decline of iCa concentration postoperatively to within the reference range (1.12–1.40 mmol/L) occurred after 24 h. Conclusion Intraoperative measurements of [PTH] can be used clinically to determine cure of primary hyperparathyroidism. Parathyroid hormone increases significantly during parathyroid gland manipulation. Plasma iCa concentration returns to within the reference range on average 24 h after successful PTX. Not all dogs require vitamin D or calcium supplementation pre‐ or postoperatively.