Generalised pustular psoriasis: three-fold mortality, and sepsis leads the excess

Design

Population-based matched cohort, linked English records, 2008–2022

Population

991 people with generalised pustular psoriasis and up to 10 matched comparators each

Primary outcome

All-cause and cause-specific mortality

Effect

All-cause aHR 3.19 (95% CI 2.58–3.91); sepsis aHR 9.76 (4.92–19.35)

Using linked English primary care, hospital, mortality and ethnicity records covering 25.8 million people from 2008 to 2022, this cohort identified 991 people with generalised pustular psoriasis and matched each with up to ten comparators.

Prevalence rose from 20.9 to 32.5 per million over the period, and was higher in women, older people and Asian people. Onset averaged 51 years but came earlier in Asian than White patients. All-cause mortality was more than three times that of comparators (adjusted HR 3.19, 95% CI 2.58 to 3.91). Deaths from cancer, respiratory, digestive and circulatory disease were all raised, and sepsis stood out (adjusted HR 9.76, 4.92 to 19.35). The younger the diagnosis, the greater the loss of life expectancy.

The sepsis signal is the clinically useful part: a flare is a systemic illness with a broken skin barrier, and should be managed as one. The higher prevalence and earlier onset in Asian patients in England is relevant to Indian practice, where generalised pustular psoriasis is seen regularly, though Indian population data are lacking.

• Manage a generalised pustular psoriasis flare as a systemic illness, checking for sepsis early.
• Admit patients with fever, hypotension or widespread pustulation rather than treating as outpatients.
• Expect earlier onset in patients of South Asian heritage.
• Review cardiovascular and other comorbidity in follow-up, as several causes of death were raised.

Why it matters

It reframes a skin disease as one with a substantial, partly preventable, mortality.

Don't overread it

This is observational; it cannot separate the disease's effect from that of its treatments or comorbidities.

The statistics, in plain English

An adjusted hazard ratio of 3.19 means people with the condition died at roughly three times the rate of matched people without it. The sepsis estimate of 9.76 has a wide interval (4.92 to 19.35) because sepsis deaths were few, but even the lower limit is a large excess.

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