Abstract
Objective To investigate the protection of superior parathyroid glands by improving dissection procedure of thyroid superior pole in total thyroidectomy surgery. Methods 136 consecutive cases undergoing two-step dissociating procedure of thyroid superior pole (the improved group) in total thyroidectomy plus central compartment dissections from Sep. 2012 to Oct. 2015 were retrospectively analyzed. Intraoperative observation of superior parathyroid and incidences of postoperative hypoparathyroidism were compared with conventional surgical methods (the conventional group) containing 113 cases from Jun. 2009 to Sep. 2012. All operations were performed by the same treatment group. Results Intraoperatively, 249 (249/272, 91.5%) superior parathyroid glands were identified in the improved group and 215 (215/226, 95.1%) superior parathyroid glands were identified in the conventional group. The difference had no statistical significance (P=0.114) . Whereas, among identified superior parathyroid glands, 242 (242/249, 97.1%) of them were conserved in situ in the improved group and 198 (198/215,92.0%) were conserved in situ in the conventional group. The difference had no statistical significance (P=0.013) . Among superior parathyroid glands conserved in situ, 225 (225/242, 93.0%) had good blood supply in the improved group and 170 (170/198, 85.9%) in the conventional group. The difference had statistically significance (P=0.001) . 28 (28/136, 20.5%) patients displayed temporary hypoparathyroidism and 2 (2/136, 1.5%) cases suffered permanent hypoparathyroidism in the improved group after surgery. Whereas, in the conventional method group, a higher incidence was observed in 37 (37/113, 32.7%) cases of temporary hypoparathyroidism and 7 (7/113, 6.2%) cases of permanent hypoparathyroidism respectively. The difference had statisticall significance (P=0.003) . Conclusions Two-step dissociating procedure technique offers protective effect on superior parathyroid glands function. It is worthy of popularization. Key words: Thyroidectomy; Parathyroid glands; Hypoparathyroidism
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