Parathyroid Changes After RAI in Patients With Differentiated Thyroid Carcinoma

xlomafota13 shared this article with you from Inoreader Parathyroid Changes After RAI in Patients With Differentiated Thyroid Carcinoma Via radioactive iodine Front Endocrinol (Lausanne). 2021 May 27;12:671787. doi: 10.3389/fendo.2021.671787. eCollection 2021. ABSTRACT OBJECTIVE: The purpose of this study was to investigate parathyroid hormone (PTH), serum calcium, phosphorus, and 25-hydroxyvitamin D (25-OH-VD) changes before and after radioactive iodine (RAI) in differentiated thyroid carcinoma (DTC) patients at different time points. METHODS: A total of 259 DTC patients who received RAI were prospectively enrolled. We evaluated P TH, serum calcium, phosphorus, and 25-OH-VD levels at baseline pre-RAI, five days, six weeks, and six months post-RAI, respectively. We analyzed the risk factors of hypocalcemia at five days post-RAI. RESULTS: The mean PTH, serum calcium and phosphorus values decreased five days post-RAI compared with pre-RAI (PTH 4.18 ± 1.23 pmol/L vs. 3.95 ± 1.41 pmol/L; calcium 2.27 ± 0.09 mmol/L vs. 2.20 ± 0.11 mmol/L; phosphorus 1.25 ± 0.17 vs. 0.98 ± 0.20 mmol/L, P < 0.05), and the differences were statistically significant. The mean 25-OH-VD levels did not significantly decrease at five days post-RAI. 21.2% (55/259) of patients had hypocalcemia at five days post-RAI, and all of them were given oral calcium supplements. At six weeks post-RAI, all of the above parameters were higher than those at five days post-RAI. Multivariate regression analysis showed that baseline pre-RAI serum calcium < 2.27 mmol/L, PTH < 4.18 pmol/L and negative 99mTcO 4 - thyroid imaging were risk factors for hypocalcemia at five days post-RAI. CONCLUSION: For DTC patients with normal PTH and serum calcium levels at pre-RAI, their PTH, serum calcium, and phosphorus levels decreased at five days post-RAI. About one-fifth of patients could have hypocalcemia at five days post-RAI. Lower baseline pre-RAI serum calcium and PTH levels and negative 99mTcO4 - thyroid imaging were risk factors for hypocalcemia five days post-RAI. PMID:34122347 | PMC:PMC8190475 | DOI:10.3389/fendo.2021.671787 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.