Six in ten haemodialysis patients itch, and phosphate was the most consistent link

Design

Systematic review and meta-analysis of observational studies

Population

25 studies, 8,955 adults on maintenance haemodialysis

Primary outcome

Prevalence and associated factors of CKD-associated pruritus

Effect

Prevalence 60% (57–63%); phosphate OR 2.93 (1.83–4.69); high-flux OR 0.31 (0.17–0.56)

A meta-analysis in BMC Nephrology (15 September) pooled 25 observational studies, 8,955 adults on maintenance haemodialysis, to estimate how common CKD-associated pruritus is and what goes with it.

Pooled prevalence was 60% (95% CI 57 to 63%). Serum phosphate was the most consistent associated factor, whether analysed as a continuous value (OR 2.03) or above a threshold (OR 2.93). Diabetes was also associated (OR 2.64), while high-flux dialysis was associated with less itch (OR 0.31). Findings for PTH, CRP, β2-microglobulin, dialysis vintage and age varied with definitions and study quality. The phosphate link appeared stronger in Asian studies, but only two non-Asian studies contributed.

These are associations, so they do not prove that lowering phosphate relieves itch. But they support a routine approach: ask every patient about itch, because many do not volunteer it, and review phosphate control and dialysis adequacy before reaching for antihistamines.

• Ask every haemodialysis patient about itch at review; many will not raise it.
• Review phosphate control and dialysis adequacy in patients with pruritus.
• High-flux dialysis was associated with less pruritus; consider it where available.
• Use a simple itch severity score to track response to any change.

Why it matters

A symptom affecting most dialysis patients is often unasked and untreated.

Don't overread it

Observational associations; the review does not show that phosphate lowering treats pruritus.

The statistics, in plain English

A prevalence of 60% means six in ten patients report some pruritus. Odds ratios of 2–3 for phosphate indicate a consistent association, but observational data cannot show that lowering phosphate reduces itch.

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