RESUMO
BACKGROUND: One of the main difficulties in assessing the effectiveness of etiologic treatment of hypoparathyroidism is absence of its standardized model. OBJECTIVE: The aim of the study was to develop a method of hypoparathyroidism modeling. METHODS: Controlled nonrandomized study was performed on female Wistar rats aged 10 month. Group 1 (n =14) was performed with destruction of parathyroid glands with electrocoagulation; group 2 (n =12)--parathyroidectomy by the developed method. In 3 and 14 days after the surgery the levels of ionized calcium, parathyroid hormone, number of white blood cells, blood leukocyte formula, indicators of immunological tests, histological examination of organs in the area of operations were performed. Statistical analysis was performed using the nonparametric Mann-Whitney-Wilcoxon test. RESULTS: Selection of animals by sex and age criteria, angular skin incision, use of the operating microscope, microsurgical techniques, extirpation of parathyroid glands via resection of thyroid gland with the closure of the wound defect glue appeared to be the distinctive features of the developed method. In 14 days the group 2 showed decrease in ionized calcium (p = 0.016), PTH (p = 0.094), leucocytes (p = 0.004), PI (p = 0.003), spontaneous NBT test (p = 0.004), induced NBT test (p = 0.003) compared with group 1. Histological examination in the group 2 revealed no changes in thyroid gland, thin connective tissue capsule, cavity with a small amount of glue, however, there were determined foci of necrosis with perifocal inflammation in the group 1. CONCLUSION: Combination of several techniques allowed to simulate metabolic disorders with persistent hypocalcemia as well as lack of mortality in early postoperative period.
