CT measures can accurately identify stroke onset

November 19, 2016

(HealthDay)—Computed tomography (CT) can measure brain water uptake, which can be used to identify stroke patients with symptom onset within 4.5 hours, according to a study published online Nov. 7 in the Annals of Neurology.

Jens Minnerup, M.D., from University of Münster in Germany, and colleagues evaluated whether CT-based quantification of in ischemic brain tissue can identify patients with stroke onset within 4.5 hours. Optimal cut-off value of water uptake was calculated in a derivation cohort with known time of (178 patients) and validated in a prospective cohort from other (240 patients).

The researchers found that in the derivation cohort, 147 patients (82.6 percent) had CT within 4.5 hours. In patients with stroke onset within 4.5 hours, the percent water uptake was significantly lower versus patients with stroke onset beyond 4.5 hours. The optimal cut-off value was 11.5 percent. When this cut-off was applied to the validation cohort the sensitivity, specificity, positive predictive value, and negative predictive value were 98.6, 90.5, 99.1, and 86.4 percent, respectively.

"Quantification of brain water uptake identifies with symptom onset within 4.5 hours with high accuracy and may guide the decision to use thrombolysis in patients with unknown time of stroke onset," the authors write.

One author disclosed financial ties to Siemens Healthcare, which provided technical support for CT perfusion analysis.

Explore further: Imaging, not time, may determine who is right for stroke clot removal

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