Journal
ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY
Volume 39, Issue 6, Pages 1253-1261Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/ATVBAHA.119.312626
Keywords
arterial stiffness; blood pressure; coronary artery disease; epidemiology; genetics; photoplethysmography
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Funding
- National Institutes of Health's Medical Scientist Training Program at the Yale School of Medicine
- Paul and Daisy Soros Fellowship
- Massachusetts General Hospital
- National Heart, Lung, and Blood Institute [K08 HL140203]
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Objective-Arterial stiffness index (ASI) is independently associated with blood pressure (BP) and coronary artery disease (CAD) epidemiologically. However, it is unknown whether these associations represent causal relationships. Here, we assess whether genetic predisposition to increased ASI is associated with elevated BP and CAD risk. Approach and Results-We first performed a large-scale epidemiological association of finger photoplethysmography-derived ASI in the UK Biobank, finding significant associations with systolic BP (ss=0.55 mm Hg; [95% CI, 0.45-0.65]; P=5.77x10(-24); N=137 858), diastolic BP (ss=1.05 mm Hg; [95% CI, 0.99-1.11]; P=7.27x10(-272); N=137 862), and incident CAD (hazard ratio, 1.08; [95% CI, 1.04-1.11]; P=1.5x10(-6); N=3692 cases, 126 615 controls) in multivariable models. We then performed an ASI genome-wide association study analysis in 131 686 participants from the UK Biobank. Across participants not in the ASI genome-wide association study, a 6-variant ASI polygenic risk score was calculated. Each SD increase in genetic ASI was associated with systolic BP (ss=4.63 mm Hg; [95% CI, 2.1-7.2]; P=3.37x10(-4); N=208 897), and diastolic BP (ss=2.61 mm Hg; [95% CI, 1.2-4.0]; P=2.85x10-4; N=208 897); however, no association was observed with incident CAD (hazard ratio, 1.12; [95% CI, 0.55-2.3]; P=0.75; N=223 061; 7534 cases). The lack of CAD association observed was replicated among 184 305 participants (60 810 cases) from the CARDIOGRAMplusC4D (Coronary Artery Disease Genetics Consortium; odds ratio, 0.56; [95% CI, 0.26-1.24]; P=0.15). Conclusions-Our data support the conclusion that finger photoplethysmography-derived ASI is an independent, genetically causal risk factor for BP, but do not support the notion that ASI is a suitable surrogate for CAD risk.
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