Infectious Burden and Risk of Stroke: the Northern Manhattan Study

Overview

Journal Arch Neurol

Specialty Neurology

Date 2009 Nov 11

PMID 19901154

Citations 84

Authors

Mitchell S V Elkind

Pankajavalli Ramakrishnan

Yeseon P Moon

Bernadette Boden-Albala

Khin M Liu

Steve L Spitalnik

Tanja Rundek

Ralph L Sacco

Myunghee C Paik

Affiliations

Soon will be listed here.

Abstract

Objective: To determine the association between a composite measure of serological test results for common infections (Chlamydia pneumoniae, Helicobacter pylori, cytomegalovirus, and herpes simplex virus 1 and 2) and stroke risk in a prospective cohort study.

Design: Prospective cohort followed up longitudinally for median 8 years.

Setting: Northern Manhattan Study. Patients Randomly selected stroke-free participants from a multiethnic urban community. Main Outcome Measure Incident stroke and other vascular events.

Results: All 5 infectious serological results were available from baseline samples in 1625 participants (mean [SD] age, 68.4 [10.1] years; 64.9% women). Cox proportional hazards models were used to estimate associations of each positive serological test result with stroke. Individual parameter estimates were then combined into a weighted index of infectious burden and used to calculate hazard ratios and confidence intervals for association with risk of stroke and other outcomes, adjusted for risk factors. Each individual infection was positively, though not significantly, associated with stroke risk after adjusting for other risk factors. The infectious burden index was associated with an increased risk of all strokes (adjusted hazard ratio per standard deviation, 1.39; 95% confidence interval, 1.02-1.90) after adjusting for demographics and risk factors. Results were similar after excluding those with coronary disease (adjusted hazard ratio, 1.50; 95% confidence interval, 1.05-2.13) and adjusting for inflammatory biomarkers.

Conclusions: A quantitative weighted index of infectious burden was associated with risk of first stroke in this cohort. Future studies are needed to confirm these findings and to further define optimal measures of infectious burden as a stroke risk factor.

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