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Journal of Geriatric Psychiatry and Neurology 2010-Sep

The relationship between inflammatory markers and post stroke cognitive impairment.

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Lana S Rothenburg
Nathan Herrmann
Walter Swardfager
Sandra E Black
Gayla Tennen
Alexander Kiss
David J Gladstone
Jon Ween
Abraham Snaiderman
Krista L Lanctôt

Keywords

Abstract

OBJECTIVE

To determine whether there is a relationship between inflammatory markers (serum C-reactive protein (CRP) and cytokines) and post stroke cognitive impairment (PSCI).

METHODS

This was a cross-sectional observational study. Patients were recruited from 4 sources: (1) the acute stroke unit of a general hospital, (2) an outpatient stroke prevention clinic, (3) a stroke rehabilitation unit in a specialized geriatric hospital, or (4) a stroke rehabilitation unit of a rehabilitation hospital. Patients meeting National Institute of Neurological and Communicative Disorders and Stroke (NINCDS) and World Health Organization Multinational Monitoring of Trends and Determinants in Cardiovascular Disease (WHO-MONICA) project criteria for stroke were invited to participate in this study within the first 5 to 31 days post stroke. Patients with subarachnoid or intracranial hemorrhage, decreased level of consciousness, severe aphasia or dysarthria, or a significant acute medical, neurological, or psychiatric illness were excluded. Clinical assessments included the Mini-Mental State Examination (MMSE) for cognition, the National Institutes of Health Stroke Scale (NIHSS) for stroke severity, and the Center for Epidemiological Studies-Depression Scale (CES-D) for depressive symptoms. Enzyme-linked immunosorbent assay (ELISA) was used to measure serum concentrations of CRP, interleukin 6 (IL-6), and interferon gamma (IFN-gamma).

RESULTS

A total of 48 patients with ischemic stroke (age [mean +/- SD] 71.6 +/- 13.2 years, 54.2% male, MMSE 26.4 +/- 3.8, NIHSS 6.8 +/- 4.0) were recruited within their first month post stroke. Backward stepwise elimination linear regression showed that higher concentrations of serum CRP (beta(CRP) = -0.46, p( CRP) = 0.002) predicted lower post stroke global cognition ([MMSE], F1,44 = 11.31, P = .002), with age (P = .92), level of education (P = .22), infarct side (P = 0.49), IL-6 (P = 0.36), and IFN-gamma (P = .57) removed from the final model.

CONCLUSIONS

A post stroke inflammatory response may be important in subacute, PSCI.

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