Background:
The mortality rate of US Veterans is greater than that of civilians, and US Veterans experience disproportionately higher burden of medical comorbidities. Disparities in coronary artery disease (CAD) incidence and its risk factors between US veterans and civilians has not previously been reported. This study seeks to identify disparities in the incidence of CAD and CAD risk factors in US veterans and the general population.
Methods:
A total of 1535 consecutive US Veterans presenting for left heart catheterization (LHC) were reviewed. We present risk factor burden, LHC outcome, and mortality with mean follow-up time of 112 ± 65.2 months.
Results:
At mean follow-up of 112 months (9.3 years), all-cause mortality was 68.3%. 12.7% had normal coronaries (NC), 14.9% had non-obstructive coronary artery disease and 72.3% had obstructive coronary artery disease (ObCAD). Mean BMI was 30.0; 87.8% had hypertension (HTN), 78.1% had hyperlipidemia (HLD), 52.2% has reduced ejection fraction (rEF), 45.5% had diabetes (DM), and 17.5% had chronic kidney disease (CKD). In order of decreasing Cox hazard, six risk factors (CKD, rEF, PVD, HTN, obesity and DM) were independent predictors of mortality.
Conclusion:
Mortality and incidence of ObCAD in US veterans are notably greater than in the American general population (per the CDC National Health Report) and other developed countries (per the WHO NCD Report). Compared to the general population, there is greater burden of HTN, HLD, DM and CKD in US Veterans. Among US Veterans, CKD carried a greater HR compared to HTN and DM, with no significant HR for HLD. This differs markedly from the general population studied in the REACH registry which established HTN, HLD and DM as the greatest predictors of cardiovascular mortality. The low hazard of HLD was likely secondary to its ubiquity in most patients in the cohort, regardless of CAD status. US Veterans have unique healthcare needs and our study guides which risk factors need to be managed to improve disparities in US Veteran health.