Comparison between Second- and Third-Generation PTH Assays during Minimally Invasive Parathyroidectomy (MIP)

Area of Science:

• Endocrinology
• Surgical Oncology
• Clinical Chemistry

Background:

• Parathyroid hormone (PTH) assays are crucial for monitoring parathyroid adenoma resection success.
• Comparing the performance of second-generation (PTH 2G) and third-generation (PTH 3G) assays in this context is important for clinical practice.

Purpose of the Study:

• To compare the efficacy of PTH 2G and PTH 3G assays in assessing intraoperative parathyroid hormone (IOPTH) fall after minimally invasive parathyroidectomy (MIP).
• To identify predictors of IOPTH decline following parathyroid adenoma resection.

Main Methods:

• 112 patients undergoing MIP were analyzed for pre- and postoperative serum calcium, creatinine, 25(OH)D, and PTH levels (T0 and T10).
• PTH 2G and PTH 3G assays were used to measure PTH levels.
• Multivariate analysis was employed to determine the effect of various factors on IOPTH fall.

Main Results:

• Both PTH 2G and PTH 3G assays demonstrated good correlation (intraclass correlation coefficient 0.74 and 0.72).
• Median IOPTH fall was comparable between PTH 2G (79.9%) and PTH 3G (82.5%) assays.
• Elevated preoperative calcium levels were the only significant independent predictor of IOPTH decline (p=0.001).

Conclusions:

• PTH 2G and PTH 3G assays yield similar results for monitoring IOPTH during parathyroid surgery.
• Preoperative hypercalcemia is a key factor influencing the magnitude of IOPTH drop.
• Further research is warranted to elucidate other factors affecting PTH kinetics post-resection.