Abstract 54: APOE Genotype Modifies the Effect of Blood Pressure on Long-term Clinical Deterioration Following Intracerebral Hemorrhage

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Introduction: Intracerebral Hemorrhage (ICH) is a severe manifestation of cerebral small vessel disease, and identifies individuals at high risk for recurrent ICH, ischemic stroke, dementia, late-life depression and gait impairment. Blood pressure (BP) following ICH is strongly associated with risk of these clinical sequelae.Hypothesis: We sought to test whether the most potent genetic risk factors for ICH recurrence, APOE ε2 / ε4, modify the effect of BP.Methods: We prospectively collected demographic and medical data for 608 consecutive ICH survivors, presenting to a single center from January 2006 to December 2013. APOE genotyping was performed on samples obtained via peripheral venous blood draw. Participants were followed longitudinally with periodic BP measurements and evaluation of recurrent ICH / ischemic stroke events. We assessed cognitive and psychiatric outcomes of interest using two validated scales: 1) Telephone Interview for Cognitive Status (TICS); 2) 4-item version of the Geriatric Depression Scale (GDS-4). We generated multivariable Cox models for each outcome, and for overall risk of clinical deterioration (i.e. developing any outcome of interest).Results:APOE ε4 and systolic BP (SBP) interacted to increase risk of ICH recurrence, small vessel ischemic stroke, dementia, and gait impairment after ICH (all p < 0.05). Among patients with average SBP 120-129 mmHg only ε4 carriers were at increased risk for clinical deterioration (Hazard Ratio = 1.67, 95% Confidence Interval 1.06-2.64, p = 0.029). ICH survivors with SBP≥130 mmHg were also at increased risk, with APOE genotype further increasing risk among those with one or more ε4 copies (Figure).Conclusions:APOE ε4 modifies the effect of BP on clinical deterioration risk following ICH, and may identify individuals most likely to benefit from aggressive BP reduction. These data raise the possibility of genetic screening informing hypertension treatment goals in ICH survivors.

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