Abstract 16591: The Impact of African Ancestry on the Pooled Cohort Equation Atherosclerotic Cardiovascular Disease Risk Estimation: Insights From the Hispanic Community Health Study/study of Latinos

Abstract

ACC/AHA 2018 guidelines recommend using Non-Hispanic (NH)-White pooled cohort equations (PCE) to estimate 10-year risk of atherosclerotic cardiovascular disease (ASCVD) among Hispanics. If African ancestry is present, the PCE for Blacks is recommended. African ancestry estimates among Hispanic Community Health Study/Study of Latinos (HCHS/SOL) background groups have been reported. 1 We applied the PCE based on fractional African ancestry to HCHS/SOL participants and compared risk estimates from NH-White and NH-Black PCE in these groups. HCHS/SOL participants aged 40-75 years were divided into two groups based on median fractional African ancestry of ~10%: groups with >=10% or higher African Ancestry (Puerto Rican, Central Americans, and Dominicans) and those with <10% or lower African ancestry (Mexicans, South Americans, Cubans). Mean predicted ASCVD incidence using both PCE's was assessed. ASCVD risk frequencies are weighted using survey methods. Differences were determined by Rao-Scott Chi-square test. The PCE was applied to 9091 HCHS/SOL participants. (mean age 53.5, 48% F) Applying the NH-White PCE to lower African ancestry groups led to 38% of participants being classified as intermediate/high (>7.5%) ASCVD risk compared to 45% using the NH-Black PCE. Using the NH-White PCE in groups with higher African ancestry led to 36% of participants being classified as intermediate/high risk compared to 46% using the NH-Black PCE. ASCVD risk estimates per Hispanic background groups are shown. (Figure 1C ). Our study is the first to apply both NH-Black and NH-White PCE to Hispanics and assess differences based on fractional African ancestry. The NH-Black PCE provided consistently greater estimates in both groups with slightly greater differential of estimates relative to NH-White PCE in those with higher African Ancestry. Further studies with outcomes data are needed to determine optimal application of PCE in Hispanics based upon fractional African Ancestry.