This single-center, prospective, three-phase observational cohort quantifies the relationship between indocyanine green (ICG) fluorescence and early parathyroid function. Adult patients scheduled for unilateral thyroid lobectomy with autotransplantation of the ipsilateral inferior parathyroid gland are enrolled. After intravenous ICG 25 µg/kg, peak fluorescence of the superior parathyroid gland and the common carotid artery (CCA) is recorded at 60-120 seconds to calculate the ratio R = PTG/CCA. Serum parathyroid hormone (PTH) is measured 30 minutes post-operatively. A derivation cohort (\~120 patients) generates R-based thresholds for in-situ preservation versus autotransplantation, which are prospectively validated in an independent cohort (60 patients) together with decision-curve analysis of clinical net benefit.
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Parathyroid Gland Fluorescence Intensity
Timeframe: Intra-operative (60 - 120 s post-ICG)
Common Carotid Artery (CCA) Fluorescence Intensity
Timeframe: Intra-operative (60 - 120 s post-ICG)
Parathyroid Hormone (PTH) at 30 Minutes post-surgery
Timeframe: 30 minutes after surgery