Abstract TU186: Plasma Metabolomics and Incident Heart Failure in Patients with Gout

Background: Individuals with gout have an elevated risk of developing heart failure (HF) compared to the general population. Larger HDL particle size associates with a higher HF risk in community-dwelling adults. Small HDL particles exert anti-inflammatory effects that may protect against gout attacks and cardiac dysfunction. Objectives: We sought to identify potentially causal metabolic contributors to the development of HF in patients with gout. Methods: We performed targeted 1 H-NMR metabolomics (Nightingale Health) on plasma samples from 1,454 Mass General Brigham (MGB) Biobank participants with a history of gout and no history of heart failure. The primary outcome was incident HF, ascertained using two ICD billing codes for heart failure. Where available, LVEF was used to categorize HF events as HFpEF (LVEF > 50%) or HFrEF (LVEF < 50%). We used multivariable Cox proportional hazards regression to quantify the associations between a 1-SD difference in metabolite level and the time to incident HF at FDR significance < 0.05. We compared metabolite-HF associations in patients with gout to those observed in a matched cohort. Results: The mean age was 75 ± 11 years, 81% of the patients were male, and 88% were self-reported as White. A total of 280 HF events (20 events per 1,000 person-years; 35 HFrEF and 143 HFpEF) occurred over a median follow-up period of 7 years. Among participants with gout, a higher concentration of extra large HDL particles significantly associated with a higher risk of incident HF (HR [95% CI]: 1.44 [1.17-1.76]). In addition, higher levels of free cholesterol (1.35 [1.12-1.62]), phospholipids (1.33 [1.10-1.61]) and total lipids (1.33 [1.10-1.60]) within each extra large HDL particle significantly associated with higher HF risk in participants with gout ( Figure ), with larger effect sizes for HFrEF than HFpEF. In contrast, higher concentrations of small HDL particles, and higher concentrations of free cholesterol, phospholipids and cholesteryl esters in small HDL particles, associated with lower HF risk in the matched controls only ( Figure ), with similar effect sizes for HFpEF and HFrEF. Conclusions: Extra large HDL particles significantly associate with a higher risk of incident HF in patients with gout. In contrast, small HDL particles associate with a lower risk of incident HF in individuals without gout. The mechanisms underlying these associations warrant further study.