Generalised pustular psoriasis: threefold mortality and a tenfold sepsis risk

Design

Population-based matched cohort, CPRD with linked hospital and death records, 2008–2022

Population

991 people with generalised pustular psoriasis among 25.8 million

Primary outcome

Incidence, prevalence, all-cause and cause-specific mortality

Effect

All-cause mortality aHR 3.19 (2.58–3.91); sepsis aHR 9.76 (4.92–19.35)

This British Journal of Dermatology cohort, published on 21 September, used linked English primary care, hospital and death records covering 25.8 million people from 2008 to 2022. It found 991 people with generalised pustular psoriasis (GPP), each matched with up to ten people without it.

Prevalence rose from 20.9 to 32.5 per million, and was higher in women, older people and Asian people, in whom onset was also earlier. All-cause mortality was more than three times that of matched controls (aHR 3.19), with raised deaths from cancer, respiratory, digestive and circulatory disease, and especially sepsis (aHR 9.76). Diagnosis at a younger age cost the most life expectancy.

GPP is often managed as an acute flare and then left to routine psoriasis care. These data argue for treating it as a high-risk systemic disease between flares too. The finding of earlier onset in Asian people in England is worth noting for Indian practice, though no Indian population data were included.

• Treat fever, rigors or hypotension in a GPP flare as possible sepsis until shown otherwise.
• Take blood cultures before assuming a pustular flare explains systemic upset.
• Review cardiovascular risk factors between flares; circulatory deaths were raised.
• Keep people with GPP under specialist follow-up even when clear.
• Expect earlier onset in patients of South Asian background.

Why it matters

Sepsis, not the skin, may be what kills people with generalised pustular psoriasis.

Don't overread it

This was observational; the excess deaths may partly reflect treatment and comorbidity, not the disease alone.

The statistics, in plain English

An adjusted hazard ratio of 3.19 means people with GPP died at a little over three times the rate of comparable people without it, after accounting for measured differences. The sepsis estimate (9.76, 4.92 to 19.35) is large but imprecise because sepsis deaths were few.

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