Update on the current management of persistent and recurrent primary hyperparathyroidism after parathyroidectomy

Table 2 Predictors of persistent/recurrent hyperparathyroidism occurrence

No.	Predictor
1	Age > 70
2	Obesity
3	ASA score 3
4	Low hospital case volume (n < 50/yr)
5	Inadequate surgeon’s experience
6	Ambiguous scintigraphy results with Sestamibi
7	Primary disease (single adenoma < double adenoma < parathyroid hyperplasia)
8	Surgical strategy (not recognizing the pathological gland, not applying bilateral cervical exploration in case of inadequate PTH reduction intraoperatively)

P-HPT: Persistent hyperparathyroidism; R-HPT: Recurrent hyperparathyroidism; PTH: Parathyroid hormone.