Abstract
Previous studies demonstrated insulin resistance and increased prevalence of impaired
glucose tolerance and type 2 diabetes mellitus in patients with primary hyperparathyroidism
(PHPT). The effect of curative parathyroidectomy on insulin sensitivity was associated
with conflicting results depending on which method for measuring the insulin sensitivity
has been used. There was no improvement using HOMA and QUICKI while minimal model
demonstrated significant improvement in insulin sensitivity. The aim of our study
was to evaluate the insulin sensitivity before and after parathyroidectomy in patients
with PHPT using a euglycemic clamp. 44 patients with PHPT and 11 age and body mass
index matched healthy controls participated in study protocol. Before surgery M values
and HOMA IR suggest insulin resistance in patients with PHPT. There was no difference
in M index (3.74±1.89 vs. 4.62±2.27, p>0.05), HOMA IR (2.94±1.39 vs. 3.29±0.81, p>0.05),
AUC glucose (863.0±261.3 vs. 842.3±165.5, p>0.05), AUC insulin (7068.7±4159.0 vs.
7229.6±2581.7, p>0.05), ISI (4.73±2.77 vs. 4.25±2.94, p>0.05) and AIR (47.89±32.05
vs. 38.96±21.20, p>0.05) between patients with PHPT and HC. There was significant
improvement in insulin sensitivity after parathyroidectomy but both preoperative and
postoperative M values were not significantly different in comparison to HC. There
were no significant changes in HOMA IR, AUC glucose, AUC insulin, ISI and AIR before
and after therapy. In conclusion, we observed significant improvement in insulin sensitivity
after parathyroidectomy in patients with PHPT. There was no difference in parameters
of insulin secretion before and after parathyroidectomy in patients with PHPT.
Key words
PTH - calcium - clamp - homa - ISI - surgery