Abstract
Abstract: <b>Background:</b> Pruritus is a common symptom experienced by patients with nondialysis
CKD, but risk factors for incident pruritus in this patient population have not been evaluated.
<b>Methods:</b> We identified 1,951 participants with CKD in the Chronic Renal Insufficiency Cohort
Study without pruritus at the baseline assessment. Pruritus was assessed by the Kidney Disease Quality
of Life-36 instrument, and moderate-to-severe pruritus was defined as a response of 3 or higher on a
Likert scale of 1 to 5. We used time-updated multivariable joint models to evaluate the association of
patient clinical characteristics, eGFR, and laboratory parameters with incident pruritus.
<b>Results:</b> Over a median follow-up of 6 years, 660 (34%) participants developed incident
moderate-to-severe pruritus, with a higher incidence rate observed among participants with more
advanced CKD. In multivariable models, the hazard ratio (95% CI) for pruritus associated with a 10
mL/min/1.73 m<sup>2</sup> lower eGFR was 1.16 (1.10 – 1.23). Older age (≥65 years), higher
body mass index, diabetes, current smoking, opioid use, depressive symptoms, and serum parathyroid
hormone were also associated with a higher risk of incident pruritus, while low serum calcium (<9
mg/dL) was associated with a lower risk (all <i>p</i><0.05). Serum phosphate was not associated with
incident pruritus in the primary analysis.
<b>Conclusions:</b> A substantial proportion of patients with nondialysis CKD develop moderate-tosevere pruritus. While lower eGFR is associated with the risk of pruritus, other comorbidities,
particularly depressive symptoms, are potential risk factors.