Abstract
Orthostatic hypotension (OH) is a potent predictor of cardiovascular frailty. Although OH is determined by changes in brachial blood pressure (BP), it has been reported that there are significant differences between central BP and peripheral BP. The prevalence of OH has been reported to be higher in subjects with isolated systolic hypertension. Since an early returning of the reflection pressure wave due to advanced arterial stiffness is one of the underlying mechanisms of systolic hypertension, a significant association between alterations of the reflection pressure wave and OH has been hypothesized. To explore this hypothesis, the orthostatic changes in carotid BP and arterial waveform were evaluated. The study subjects were 155 community residents (69±7 years old). Carotid and brachial BP were measured simultaneously in the supine position and 1 min after standing using a cuff-oscillometric and tonometric method. The carotid augmentation index (AIx) was obtained from the pressure waveform. The orthostatic decline of BP was more prominent in the carotid artery than the brachial artery. Nine subjects were diagnosed with orthostatic systolic hypotension (OSH) from brachial BP, while 21 subjects were diagnosed from carotid BP (p<0.001). The orthostatic change in carotid systolic BP was significantly associated with that in carotid AIx (r=0.361, p<0.001). The decline of the reflection component of carotid pulse pressure (-4.0±8.4 mmHg) was more prominent than that of the incident component (-1.2±9.9 mmHg, p=0.002). These results indicate that evaluation of brachial BP may not represent the orthostatic changes in central BP. Alteration of the reflection pressure wave could be one of the underlying mechanisms of OSH in the central artery.
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Tabara, Y., Nakura, J., Kondo, I. et al. Orthostatic Systolic Hypotension and the Reflection Pressure Wave. Hypertens Res 28, 537–543 (2005). https://doi.org/10.1291/hypres.28.537
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DOI: https://doi.org/10.1291/hypres.28.537
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