Abstract:
OBJECTIVE:Genetic variants ε2/ε4 within the APOE gene are established risk factors for lobar intracerebral hemorrhage (ICH). Published preliminary data suggest a potential role for APOE ε4 in risk of nonlobar ICH. We therefore investigated the role of APOE in recurrent nonlobar ICH, and sought to clarify whether effects of APOE on circulating lipids mediate this association. METHODS:Three hundred sixty-three survivors of nonlobar ICH were followed prospectively for ICH recurrence, with APOE genotype determined at enrollment. All participants had clinical, demographic, and laboratory data captured at time of index ICH and during follow-up. Using a multivariate model, we performed association and interaction analyses of the relationships among APOE genotype, lipid levels, and recurrent nonlobar ICH. RESULTS:We observed 29 nonlobar ICH recurrences among 363 survivors. APOE ε4 was associated with recurrent nonlobar ICH (hazard ratio = 1.31; 95% confidence interval = 1.02-2.69; p = 0.038) after adjustment for age/sex/ethnicity and cardiovascular risk factors. Increasing low-density lipoprotein (LDL) levels were associated with decreased risk of recurrent nonlobar ICH (p = 0.027), as were decreasing HDL levels (p = 0.046). LDL levels modified the association of APOE ε4 with recurrent nonlobar ICH (mediation p < 0.05). No associations were identified between APOE ε2 and recurrent nonlobar ICH. CONCLUSION:APOE ε4 is associated with recurrent ICH in nonlobar brain regions, providing further evidence for its causal role in ICH unrelated to cerebral amyloid angiopathy. LDL levels modulated this effect, suggesting that circulating lipid levels may mediate a portion of the role of APOE ε4 in nonlobar ICH.
journal_name
Neurologyjournal_title
Neurologyauthors
Raffeld MR,Biffi A,Battey TW,Ayres AM,Viswanathan A,Greenberg SM,Rosand J,Anderson CDdoi
10.1212/WNL.0000000000001790subject
Has Abstractpub_date
2015-07-28 00:00:00pages
349-56issue
4eissn
0028-3878issn
1526-632Xpii
WNL.0000000000001790journal_volume
85pub_type
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