Background: The effects of underlying renal insufficiency on intraoperative parathormone monitoring during parathyroidectomy (PTX) for primary hyperparathyroidism remain unclear. This study evaluates operative outcomes in patients undergoing parathyroidectomy using classic or stricter >50% intraoperative parathormone decrease criterion for primary hyperparathyroidism with mild or moderate renal insufficiency. Methods: A retrospective review of prospectively collected data in 577 patients undergoing parathyroidectomy guided by intraoperative parathormone monitoring for primary hyperparathyroidism was performed. Patients were stratified by stages I to III of chronic kidney disease; those with overt secondary hyperparathyroidism (chronic kidney disease stages IV and V) were excluded. Patients were further subdivided into subgroups based on the classic criterion of a >50% intraoperative parathormone decrease and a stricter criterion of a >50% intraoperative parathormone decrease e to a normal range (<65 pg/mL). Long-term operative outcomes were compared across the 3 chronic kidney disease groups. Results: Of 577 patients, 38% (221) had normal renal function or stage I chronic kidney disease, 44% (251) had stage II chronic kidney disease, and 18% (105) had stage III chronic kidney disease. In stages I and II chronic kidney disease patients, there were no differences in operative success, failure, recurrence, bilateral neck exploration, and multiglandular disease between classic and stricter criterion groups. In contrast, in stage III chronic kidney disease patients, operative success was greater using the stricter intraoperative parathormone criterion than the classic intraoperative parathormone criterion (100% vs 92%, respectively, P < .05). No other outcome differences were identified between classic and stricter intraoperative parathormone criterion subgroups in stage III chronic kidney disease patients. Conclusion: In patients with primary hyperparathyroidism and concurrent stage III chronic kidney disease, a stricter criterion of a >50% intraoperative parathormone decrease to a normal range should be used for successful parathyroidectomy.
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