Incident Gout and Risk of First-Time Acute Coronary Syndrome: A Prospective, Population-Based Cohort Study in Sweden

Abstract

Objective: To investigate the risk of first-time acute coronary syndrome (ACS) in a large cohort of primary and secondary care patients with incident gout compared to the general population.

Methods: Using register data for the period 2007-2017, we conducted a prospective, population-based cohort with 20,146 patients with incident gout (mean age 65.6 years; 67.4% male) and 83,517 matched population controls without prior history of coronary heart disease. We calculated incidence rates (IRs) and hazard ratios (HRs) adjusted for baseline comorbidities and dispensed prescriptions. In a sensitivity analysis, we included gout cases and controls with no previously diagnosed comorbidity (6,075 cases and 44,091 controls).

Results: The IR of first-time ACS was significantly increased in the gout cohort compared to controls (9.1 versus 6.3 of 1,000 person-years). Unadjusted Cox regression showed that gout patients had higher risk of first-time ACS compared to controls (HR 1.44 [95% confidence interval (95% CI) 1.33-1.56]), with a higher HR in women (HR 1.64 [95% CI 1.41-1.90]) than in men (HR 1.36 [95% CI, 1.24-1.50]). In multivariable analysis, the risk diminished but remained significant (HR 1.15 [95% CI 1.06-1.25]). The risk was similar in the sensitivity analysis (HR 1.20 [95% CI 1.01-1.44]) and still higher in women (HR 1.34 [95% CI 0.86-2.08]) than in men (HR 1.18 [95% CI 0.97-1.44]).

Conclusion: Patients with incident gout have a 44% increased risk of first-time ACS, higher in women than in men. This risk is largely explained by the underlying comorbidities, but there is still a modestly increased risk that may be due to gout-related factors.