PERSISTENT POST TRANSPLANT HYPERPARATHYROIDISM IN LIVE RENAL TRANSPLANT COHORT: LOWER INCIDENCE AND ATYPICAL RISK FACTORS

 

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https://storage.unitedwebnetwork.com/files/1099/702002a0a68cfb57d5344b1792747772.pdf
PERSISTENT POST TRANSPLANT HYPERPARATHYROIDISM IN LIVE RENAL TRANSPLANT COHORT: LOWER INCIDENCE AND ATYPICAL RISK FACTORS

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Ruby
Hafeez
Ruby Hafeez rubyhafeez@ymail.com Sindh Institute of Urology and Transplantation Nephrology Karachi Pakistan *
Tahir Aziz tahir_aziz61@yahoo.com Sindh Institute of Urology and Transplantation Nephrology Karachi Pakistan -
Sajid Islam Bhatti sajidibhatti@yahoo.com Sindh Institute of Urology and Transplantation Nephrology Karachi Pakistan -
Tabassum Tariq elahitabassum@gmail.com Sindh Institute of Urology and Transplantation Nephrology Karachi Pakistan -
Farzana Rasheed sweetr14@yahoo.com Sindh Institute of Urology and Transplantation Nephrology Karachi Pakistan -
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Persistent hyperparathyroidism after kidney transplantation is a global challenge, with historical wide  incidence rates ranging from 8% to 58%, linked to pre transplant dialysis duration and hyperparathyroidism severity. The characteristics of secondary hyperparathyroidism in populations with predominantly live related donors  having short waiting times (<1year) needs further investigations. The same has been  primarily focused in this research work.

The objective of this study is to determine the frequency and identify the factors influencing persistent secondary hyperparathyroidism in a contemporary cohort of live related renal transplant recipients at a high volume center in Pakistan.

We conducted a cross–sectional study of 200 stable adult recipients, 6-24 months post-transplant at SIUT, Pakistan. Patients with graft failure were excluded. Persistent secondary hyperparathyroidism was defined as parathyroid hormone (P.T.H) > 108pg/ml (2 x upper normal limit. All participants’ underwent biochemical profiling (P.T.H, calcium phosphate, alkaline phosphatase, serum creatinine) and radiographic bone surveys.

The cohort (mean age 31 ± 9 years; 76% male had excellent allograft function (mean creatinine 1.35± 0.36mg/dl). The frequency of persistent secondary hyperparathyroidism was 20.5% (41/200). Hyper-calcemia and hypophosphatemia were present in 10.5% and 22.5% of the overall cohort respectively. Remarkably, multivariate analysis revealed no significant association between secondary hyperparathyroidism and traditional risk factors, including pre transplant dialysis duration (p=0.45), current graft function (p=0.52) or time since transplant (p=0.61). The only significant predictor was male sex (p<0.01) with a 3.4;1 male to female ratio in the cohort. 

In a live related transplant programme with short waiting times (i.e. renal transplant are being conducted < 1 year at SIUT), we observed a lower incidence of persistent secondary hyperparathyroidism and a notable dissociation from its classic risk factors. This suggests a distinct phenotype of post-transplant bone disease in this setting, potentially influenced by rapid transplantation. The strong male predominance warrants further genetic or hormonal investigation. Hypogonadism occurs in both male and females with terminal renal failure. An explanation could be female skeleton is protected due to the effect of estrogen. Our findings advocate for region specific management protocols that move beyond paradigms established in populations with longer dialysis exposure. 

Kewords