The relative importance of systolic versus diastolic blood pressure control and incident symptomatic peripheral artery disease in women

Abstract

Prospective data regarding risk factors for peripheral artery disease (PAD) are sparse, especially among women; the relative contribution of systolic versus diastolic blood pressure control for incident PAD has not been well studied. We evaluated the association of self-reported blood pressure control with incident symptomatic PAD in middle-aged and older women. We examined the relationship between reported hypertension and incident confirmed symptomatic PAD (n = 178) in 39,260 female health professionals aged ≥ 45 years without known vascular disease at baseline. Median follow-up was 13.3 years. Women were grouped according to presence of reported isolated diastolic (IDH), isolated systolic (ISH), or combined systolic-diastolic hypertension (SDH) using cut-points of 90 and 140 mmHg for diastolic and systolic blood pressure, respectively. SBP and DBP were modeled as continuous and categorical exposures. Multivariable-adjusted hazard ratios (HRs), including adjustment for cardiovascular risk factors, were derived from Cox proportional hazards models. Adjusted HRs compared to women without reported hypertension were 1.0 (0.4-2.8) for IDH, 2.0 (1.3-3.1) for ISH, and 2.8 (1.8-4.5) for SDH. There was a 43% increased adjusted risk per 10 mmHg of reported SBP (95% CI 27-62%) and a gradient in risk according to SBP category (< 120, 120-139, 140-159, and ≥ 160 mmHg); HRs were 1.0, 2.3, 4.3, and 6.6 (p-trend < 0.001), respectively. Reported DBP, while individually predictive in models excluding SBP, was not predictive after adjustment for SBP. In conclusion, these prospective data suggest a strong prognostic role for uncontrolled blood pressure and, particularly, uncontrolled systolic blood pressure in the development of peripheral atherosclerosis in women. © 2011 The Author(s).