Association Between Uremic Pruritus and Serum Level of Fibroblast Growth Factor 23 in Hemodialysis Patients in North of Iran: An Observational Study

 Chronic itch (CI) in hemodialysis (HD), also called uremic pruritus (UP), is a common, distressing, and unpleasant symptom. Fibroblast growth factor 23 (FGF23) is a bone-secreted phosphaturic factor. Several bone diseases can accompany kidney diseases. It is unclear whether the common disturbance of calcium/phosphate homeostasis can cause CI in chronic kidney disease.

 This study investigated the association between FGF23 and UP among HD patients in northern Iran.

 Patients undergoing maintenance HD at four referral medical centers were recruited in this cross-sectional survey. The enzyme-linked immunosorbent assay was used to evaluate serum FGF23 levels. An interview questionnaire was used to analyze the various aspects of pruritus.

 Of 237 subjects, 54.01% had UP. There was no difference in serum FGF23 levels between patients with and without UP (413.17 ± 416.97 vs. 410.81 ± 444.49, P = 0.85). Those with UP required dialysis for a longer period (P = 0.02). FGF23 was shown to be associated with parathyroid hormone in UP (P = 0.02, r = 0.41).

 There was no linear correlation between FGF23 and UP in this study.