Orthostatic blood pressure adaptations, aortic stiffness, and central hemodynamics in the general population: insights from the Malmö Offspring Study (MOS).

ABSTRACT

PURPOSE: Arterial stiffness is independently associated with orthostatic hypotension in older individuals. The relationship between orthostatic blood pressure adaptation and aortic stiffness has not been thoroughly examined in a younger population. We investigated the relationship between orthostatic blood pressure adaptations, central aortic hemodynamics, and aortic stiffness in a cohort of predominantly younger and middle-aged adults. METHODS: We analyzed an observational, population-based study of 5259 individuals living in Malmö, Sweden. We related aortic stiffness and central hemodynamics assessed by carotid-femoral pulse wave velocity and pulse wave analysis at the arteria radialis using Sphygmocor to orthostatic blood pressure adaptation after 3 min standing. RESULTS: The mean age of the population was 41.9 ± 14.5 years, and 52.1% were women. We observed the highest aortic stiffness and central aortic blood pressure measurements in the lowest and highest quartiles of orthostatic systolic blood pressure differences (p < 0.001). Aortic stiffness and central aortic blood pressure gradually decreased across increasing quartiles of orthostatic diastolic blood pressure difference (p < 0.001). After full adjustment, orthostatic diastolic blood pressure remained significantly associated with aortic stiffness (p = 0.001) and central aortic blood pressure (p < 0.001), whereas orthostatic systolic blood pressure was significantly associated only with central aortic systolic blood pressure (p = 0.009). No significant associations were found between subclinical orthostatic hypotension, aortic stiffness, and central hemodynamics. CONCLUSIONS: Our findings demonstrate that altered blood pressure responses to orthostatic challenges, both blood pressure reductions and blood pressure increases, are independently and inversely associated with markers of aortic stiffness (vascular aging) in a predominantly young to middle-aged population.