Helicopter emergency medical services and stroke care regionalization: measuring performance in a maturing system.

This study retrospectively analyzed 123 patients undergoing helicopter emergency medical services transport for ischemic stroke (ischemic cerebrovascular accident) to the Massachusetts General Hospital during 2000-2004. To assess for system improvements over time, data were analyzed between the 2 consecutive 30-month periods comprising the 5-year study. Patients transported during the latter 30 months were transported from lesser distances (P = .002), were more likely to be younger than 65 years (P = .005), and were more likely to have documented symptom onset time (P = .03) and National Institutes of Health Stroke Scale (odds ratio, 3.6; 95% confidence interval, 1.7-7.6; P = .001). Time end points analysis found no significant improvements in any intervals compared across the 2 study eras. Age older than 65 years was the only covariate associated with a more rapid arrival at the Massachusetts General Hospital (odds ratio, 2.4; 95% CI, 1.1-5.4; P = .03). This study of our stroke transport system identified both areas of good performance and also areas for focusing further improvement efforts.