Supplementary Material for: Late Neurological Deterioration after Acute Intracerebral Hemorrhage: A post hoc Analysis of the ATACH-2 Trial

<b><i>Background:</i></b> Neurological deterioration (ND) has a major influence on the prognosis of intracerebral hemorrhage (ICH); however, factors associated with ND occurring after 24 h of ICH onset are unknown. <b><i>Methods:</i></b> We performed exploratory analyses of data from the Antihypertensive Treatment of Acute Cerebral Hemorrhage 2 trial, which compared intensive and standard blood pressure lowering treatment in ICH. NDs were captured on the adverse event case report form. Logistic regression analysis was performed to examine the independent predictors of late ND. <b><i>Results:</i></b> Among 1,000 participants with acute ICH, 82 patients (8.2%) developed early ND (≤24 h), and 64 (6.4%) had late ND. Baseline hematoma volume (adjusted OR [aOR] per 1-cm³ increase 1.04, 95% CI 1.02–1.06, <i>p</i> &lt; 0.0001), hematoma volume increase in 24 h (aOR 2.24, 95% CI 1.23–4.07, <i>p</i> = 0.008), and the presence of intraventricular hemorrhage (IVH; aOR 2.38, 95% CI 1.32–4.29, <i>p</i> = 0.004) were independent predictors of late ND (vs. no late ND). Late ND was a significant risk factor for poor 90-day outcome (OR 3.46, 95% CI 1.82–6.56). No statistically significant difference in the incidence of late ND was noted between the 2 treatment groups. <b><i>Conclusions:</i></b> Initial hematoma volume, early hematoma volume expansion, and IVH are independent predictors of late ND after ICH. Intensive reduction in the systolic blood pressure level does not prevent the development of late ND.