Abstract P218: The Association Of Mid-life Cumulative Exposure To Systolic Blood Pressure, Myocardial Oxygen Demand, And Hypertension With Later-life Central Arterial Stiffness And Its 5-year Change: The Atherosclerosis Risk In Communities Study - Neurocognitive Study (ARIC-NCS)

Abstract

Background: Greater central artery stiffness predicts cardiovascular disease and all-cause mortality, thus understanding arterial stiffness determinants has prevention implications. Reports of the temporal association of blood pressure with arterial stiffness are conflicting and the association with myocardial oxygen demand has not been evaluated. Objective: Characterize the association of mid- to later-life cumulative exposure to systolic blood pressure (SBP), myocardial oxygen demand, and hypertension (HTN) with arterial stiffness and its 5-year change in older adults. Methods: We included 1,975 adults (1151 women; 359 Black; visit 5 mean age 74 years) examined in visits 5 (2011-13) and 6 or 7 (2016-19) of the population-based ARIC-NCS with measures of arterial stiffness (carotid-femoral pulse wave velocity (cfPWV)). Higher cfPWV indicates greater arterial stiffness. We calculated cumulative exposures as the sum of averages from four consecutive visits from 1987-89 to 1996-98 divided by total time. Myocardial oxygen demand was calculated as the rate pressure product (RPP): (SBP x heart rate)/1,000. We derived HTN duration as the time since first HTN detection. Associations of cumulative exposures with visit 5 cfPWV and the 5-year cfPWV change were evaluated by multivariable linear regression adjusted for demographics and cardiometabolic factors. Results: Over the mean 5.7 years between visits 5 and 6 or 7, cfPWV increased by 144.9 cm/s (SD: 276.0; range -680.0, 961.5 cm/s). HTN at any visit, duration, and the time-weighted cumulative measures were associated with higher visit 5 cfPWV (Table). Prevalent HTN was inversely associated with cfPWV change. No statistically significant associations were observed for the other exposures and cfPWV change. Conclusion: Cumulative exposure to SBP, RPP, and HTN are modifiable traits associated with higher cfPWV at later-life, but not with rate of cfPWV change in older adulthood. HTN at visit 5 was associated with lower cfPWV change, albeit the change is of small magnitude.