Parathyroid hormone levels in long-term renal transplant children and adolescents

Area of Science:

• Nephrology
• Endocrinology
• Pediatric Surgery

Background:

• Secondary hyperparathyroidism frequently complicates chronic renal failure.
• Kidney transplantation improves renal function but hyperparathyroidism persists in 50% of pediatric recipients.
• Understanding the long-term course and risk factors is crucial for managing persistent hyperparathyroidism post-transplant.

Purpose of the Study:

• To investigate the course of parathyroid hormone (PTH) levels in children after kidney transplantation.
• To identify potential risk factors associated with persistent hyperparathyroidism in this population.

Main Methods:

• A cohort of 145 pediatric kidney transplant recipients was studied with a mean follow-up of 4.7 years.
• Intact PTH (iPTH), calcium, and phosphorus levels were monitored pre- and post-transplant.
• Multivariate analysis was used to identify predictors of persistent hyperparathyroidism.

Main Results:

• Serum iPTH levels decreased significantly in the first 6 months and continued to decline long-term.
• Prevalence of hyperparathyroidism decreased from 69.1% at transplant to 47% at 1 year post-transplant.
• Pre-transplant hyperparathyroidism, longer dialysis duration, creatinine clearance, and hypophosphatemia predicted persistent disease.

Conclusions:

• Serum iPTH levels tend to normalize in the majority of children long after kidney transplantation.
• Parathyroidectomy should be reserved for a select group of pediatric kidney transplant recipients with persistent hyperparathyroidism.