Herpes zoster as a short-term vascular trigger, most clearly for stroke

Design

Systematic review of observational studies with a separate mechanistic review

Population

Five epidemiological studies of people after herpes zoster or zoster ophthalmicus

Primary outcome

Cardiovascular and cerebrovascular events after zoster

Effect

Most consistent association with stroke, peaking about 3 to 4 weeks after onset; myocardial infarction evidence less consistent (no pooled estimate in the abstract)

This systematic review looked at observational studies of cardiovascular and cerebrovascular events after herpes zoster or herpes zoster ophthalmicus. From 594 records, five epidemiological studies (cohort, case-control, self-controlled case-series and case-crossover designs) formed the primary synthesis, with mechanistic reports considered separately.

Stroke showed the most consistent association. Risk was highest in the first weeks and months, and self-controlled analyses pointed to a peak about 3 to 4 weeks after onset. Herpes zoster ophthalmicus carried more cerebrovascular risk than zoster elsewhere. Evidence for myocardial infarction and peripheral arterial disease was suggestive but less consistent. Proposed mechanisms include varicella-zoster virus vasculopathy, inflammation, endothelial dysfunction and thrombosis.

The abstract gives no pooled effect sizes, and with only five studies and an observational design this supports vigilance rather than a new treatment. For a ward or general clinic, it is a prompt to ask about vascular risk factors and neurological symptoms in people who have recently had shingles, especially affecting the eye. Whether antivirals or vaccination reduce this vascular risk is not shown here.

• Ask about new neurological symptoms in anyone seen with shingles in the past few weeks.
• Treat shingles around the eye as higher risk and make sure the vascular risk factors are controlled.
• Review blood pressure, lipids, smoking and antithrombotic need in older patients with zoster.
• Counsel patients to seek urgent care for sudden weakness, speech change or visual loss after shingles.
• Remember zoster vaccination is a separate, established reason to vaccinate eligible older adults.

Why it matters

It reframes zoster from a skin complaint to an event with a window of raised vascular risk.

Don't overread it

This was a review of observational studies; it does not show that treating zoster or vaccinating reduces strokes.

The statistics, in plain English

The review reports a pattern rather than a pooled number: risk is highest soon after the rash and then falls. A self-controlled design compares each person with themselves at other times, which removes many fixed differences between people, but it cannot remove everything that differs around the time of illness.

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