Abstract 7: Cerebral Small Vessel Disease Burden and Association With Post-Surgical Rebleeding and Long-Term Outcome in Intracerebral Hemorrhage Patients From the Mistie III Trial

Objectives: To examine the effect of cerebral small vessel disease (CSVD) markers and CSVD burden on hematoma expansion and long-term functional outcomes in large spontaneous intracerebral hemorrhage (ICH) >30 mL. Method: Retrospective analysis of 288 patients from the MISTIE III trial with qualified MRI sequences. MISTIE III evaluated minimally invasive surgery plus alteplase (vs medical management). We identified 6 CSVD markers including lacunes, cerebral microbleeds (CMB), enlarged perivascular space (EPVS), white matter hyperintensities (WMH), cortical superficial siderosis (cSS), and acute DWI positive lesions. First 5 components were reviewed on day 1 MRI and DWI lesions on day 7. The primary outcome was death or major disability at one year (modified Rankin score 4-6). Secondary outcome was post-surgical rebleeding, defined as symptomatic or asymptomatic hemorrhage expansion within 72 hours post last dose of alteplase. Result: Unfavorable outcome occurred in 65.9% at one year. Post-surgical ICH expansion occurred in 34 (22.9%) of 148 surgical patients. Mean time from symptom onset to first MRI was 0.94 (IQR 0.2-6.3) days. Most individual CSVD markers were more common in patients with unfavorable vs. favorable outcome: CMB≧5 (26.1% vs 15.0%, p=0.03), DWI lesions (65.8%vs 49.6%, p=0.006), cSS (16.8% vs 7.1%, p=0.02) severe WMH (67.7% vs 29.9%, p<0.001) severe EPVS in basal ganglia (19.3% vs 10.2%, p=0.047), and lacunes (11.2% vs 6.3%, p=0.21), In the multivariable adjusted model, cumulative CSVD score (one point for each component: CMB≥5, severe EPVS in basal ganglia, lacunes, severe WMH and cSS) was independently associated with unfavorable outcome (OR 0.56, 95%CI 0.41-0.76, p<0.001; AUC 0.855). We did not find a relationship between either independent CSVD markers or CSVD score with post-surgical ICH expansion. Cumulative CSVD score in multivariable analysis adjusted for predictors of hematoma expansion had OR 0.77 (95% CI 0.50-1.19, p=0.77; AUC 0.659). Conclusion: In large volume ICH patients with long-term follow-up, heavy burden of CSVD at ICH onset remains an independent predictor of unfavorable outcome, and particularly severe white matter hyperintensities. CSVD markers did not show association with post-surgical ICH expansion.