Intraoperative parathyroid hormone concentration to confirm removal of hypersecretory parathyroid tissue and time to postoperative normocalcaemia in nine dogs with primary hyperparathyroidism.
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.


METHODS
Retrospective study (2005-10) from a private referral hospital in Sydney, New South Wales, Australia.


METHODS
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.


CONCLUSIONS
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.
North Shore Veterinary Specialist Centre, 64 Atchison Street, Crows Nest, New South Wales 2065, Australia. kjgraham@optusnet.com.au
K J
KJ
Graham
M
M
Wilkinson
J
J
Culvenor
N K
NK
Dhand
R K
RK
Churcher
D000818:Animals; D002118:Calcium / Q000097:blood; D004283:Dog Diseases / Q000097:blood* / Q000601:surgery; D004285:Dogs; D005260:Female; D006961:Hyperparathyroidism / Q000097:blood / Q000601:surgery / Q000662:veterinary*; D007430:Intraoperative Care / Q000379:methods / Q000662:veterinary*; D008297:Male; D010281:Parathyroid Hormone / Q000097:blood*; D016105:Parathyroidectomy / Q000379:methods / Q000662:veterinary*; D012189:Retrospective Studies
D010281:Parathyroid Hormone; D002118:Calcium