Cincinnati prehospital stroke scale: Reproducibility and validity

Study objective: The Cincinnati Prehospital Stroke Scale (CPSS) is a 3-item scale based on a simplification of the National Institutes of Health (NIH) Stroke Scale. When per formed by a physician, it has a high sensitivity an d specificity in identifying patients with stroke who are candidates for th rombolysis. The objective of this study was to validate and verify the repr oducibility of the CPSS when used by prehospital providers. Methods: The CPSS was performed and scored by a physician certified in the use of the NIH Stroke Scale (gold standard). Simultaneously, a group of 4 p aramedics and EMTs scored the same patient. Results: A total of 860 scales were completed on a convenience sample of 17 1 patients from the emergency department and neurology inpatient service. O f these patients, 49 had a diagnosis of stroke or transient ischemic attack . High reproducibility was observed among prehospital providers for total s core (intraclass correlation coefficient [r(l)], .89; 95% confidence interv al [Cl], .87 to .92) and for each scale item: arm weakness, speech, and fac ial droop (.91, .84, and .75, respectively). There was excellent intraclass correlation between the physician and the prehospital providers for total score (r(l),.92; 95% Cl,.89 to .93) and for the specific items of the scale (.91,.87, and .78, respectively). Observation by the physician of an abnor mality in any 1 of the 3 stroke scale items had a sensitivity of 66% and sp ecificity of 87% in identifying a stroke patient. The sensitivity was 88% f or identification of patients with anterior circulation strokes. Conclusion: The CPSS has excellent reproducibility among prehospital person nel and physicians. It has good validity in identifying patients with strok e who are candidates for thrombolytic therapy, especially those with anteri or circulation stroke.