Early Measure of Postoperative Ipth and Corrected Calcium As Predictors of Future Hypoparathyroidism: Which, when and Why?

Material and methods – We include 748 patients who underwent total thyroidectomy from 2005 to 2011. They were evaluated more than one year after surgery. Permanent hypoPT (PhypoPT) is defined by [iPTH]<15 pg/ml without treatment one year passed after surgery. [iPTH] between 5-15 pg/ml were defined as partial deficiency, whereas less than 5 pg/ml were considered total deficiency. Cases with spontaneous recovering of parathyroid function after a period of [iPTH]<15 were named as transient hypoPT (ThypoPT). We analyze the correlation between [iPTH] measured 24 hours after surgery, [iPTH24h], and future parathyroid function. We also analyze the correlation between [iPTH] measured immediately, 1 to 3 hours after surgery, [iPTH1-3h], corrected calcium monitored 6 hours postoperatively , [Ca6h], and subsequent parathyroid status.