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The decision to perform decompressive hemicraniectomy (DHC) by default in malignant hemispheric stroke (MHS) remains controversial. Even under ideal conditions, DHC usually results in moderate to severe disability. The present study for the first time uses neuroimaging to identify independent outcome predictors in a prospective cohort of 96 MHS patients undergoing DHC. The primary outcome was functional status according to the modified Rankin Scale (mRS) at 12 months and categorized as favorable (mRS 0-3) or unfavorable (mRS 4-6). At 12 months, 19 patients (20%) reached favorable and 77 patients (80%) unfavorable outcome. The overall mean infarct volume was 328 ± 114 ml. Multivariable logistic regression identified age per year (OR 1.14, 95% CI 1.04-1.24; p = 0.005), infarct volume per cm 3 (OR 1.012, 95% CI 1.003-1.022; p = 0.013), thalamic involvement (OR 8.65, 95% CI 1.04-72.15; p = 0.046) and postoperative pneumonia (OR 5.52, 95% CI 1.03-29.57; p = 0.046) as independent outcome predictors, which was confirmed by multivariable ordinal regression for age ( p = 0.004) and infarct volume ( p = 0.015). The infarct volume threshold for reasonable prediction of unfavorable outcome in our patients was 270 cm 3 , which in the future may help prognostication and development of clinical trials on DHC and outcome in MHS.

Infarct volume predicts outcome after decompressive hemicraniectomy for malignant hemispheric stroke