PARATHYROID FUNCTION AFTER SUCCESSFUL RENAL-TRANSPLANTATION

Purpose. The aim of this retrospective study was to assess parathyroid function after renal transplantation in patients with good renal func tion (creatinine < 133 mu mol/l). Methods and materials. Of 1 628 pati ents on whom we performed renal transplantation, 210 have stable good renal function as defined above. Total calcium (Ca), creatinine, album in and parathyroid hormone (PTH) values were obtained from patient rec ords at varying intervals after transplantation, and in 91/210 patient s pre-transplant values were available. Patients who had undergone par athyroidectomy before the transplant were excluded from the study. Fol low-up ranged from 6 months to 24 years. Results. These 210 patients w ere divided into 4 groups according to PTH and Ca levels. Group 1 cons isted of 118 patients (56%) with normal Ca and PTH levels and group 2 of 69 patients (33%) with normal Ca but persistently high PTH levels, of whom 25 persistently have Ca levels in the high normal range. The r eason for the inappropriate PTH levels is not obvious. In group 3 ther e were 18 patients (8%) with high Ca and PTH levels. They have disease requiring parathyroidectomy. Group 4 comprised 5 patients (3%) with l ow Ca and high PTH levels. In the 91 patients for whom pre-transplant PTH Values were available, 16/46 patients with tertiary hyperparathyro idism (3 degrees HPT) have normalised after transplant, 12/46 patients have ongoing 3 degrees HPT post transplant, while 4/45 patients with less severe disease (secondary HPT) have developed 3 degrees HPT (P < 0.059). Conclusions. In 56% of patients with good renal function after transplant parathyroid function is normal. Thirty-three per cent have high PTH levels with normal Ca, but 36% of these are in the high norm al range. Eight per cent have persistent 3 degrees HPT. Posttransplant parathyroid dysfunction correlates with the severity of pre-transplan t disease.