Charlson Index comorbidity adjustment for ischemic stroke outcome studies

Area of Science:

• Neurology
• Clinical Epidemiology
• Health Services Research

Background:

• The Charlson Index is a widely used comorbidity score in health outcomes research.
• Its specific validation in ischemic stroke outcome studies is limited.
• Comorbidities significantly impact stroke patient prognosis.

Purpose of the Study:

• To validate the Charlson Index for assessing comorbidity in ischemic stroke patients.
• To determine if patient outcomes after ischemic stroke vary based on Charlson Index scores.
• To evaluate the Charlson Index's utility in adjusting for baseline patient characteristics in stroke research.

Main Methods:

• Prospective cohort study of 960 ischemic stroke patients across 9 VA hospitals.
• Charlson Index calculated from discharge ICD-9-CM codes and dichotomized (0-1 vs. >=2).
• Outcomes assessed by modified Rankin Scale at discharge and 1-year mortality, adjusted for stroke severity.

Main Results:

• Higher Charlson Index scores correlated with poorer outcomes at discharge (48% vs. 37% good outcome) and increased 1-year mortality (16% vs. 26%).
• Logistic regression revealed a high Charlson Index was associated with increased odds of poor discharge outcome (36%) and 1-year mortality (72%).
• Each 1-point increase in the Charlson Index independently raised odds of poor discharge outcome (15%) and 1-year mortality (29%).

Conclusions:

• The Charlson Index demonstrates validity as a comorbidity measure in ischemic stroke outcome studies.
• Findings support its use for adjusting for comorbidities in research on ischemic stroke.
• The index provides valuable prognostic information for ischemic stroke patients.