Reservoir pressure analysis of aortic blood pressure: an in-vivo study at five locations in humans.
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ABSTRACT: INTRODUCTION:The development and propagation of the aortic blood pressure wave remains poorly understood, despite its clear relevance to major organ blood flow and potential association with cardiovascular outcomes. The reservoir pressure model provides a unified description of the dual conduit and reservoir functions of the aorta. Reservoir waveform analysis resolves the aortic pressure waveform into an excess (wave related) and reservoir (compliance related) pressure. The applicability of this model to the pressure waveform as it propagates along the aorta has not been investigated in humans. METHODS:We analysed invasively acquired high-fidelity aortic pressure waveforms from 40 patients undergoing clinically indicated coronary catheterization. Aortic waveforms were measured using a solid-state pressure catheter at five anatomical sites: the ascending aorta, the transverse aortic arch, the diaphragm, the level of the renal arteries, and at the aortic bifurcation. Ensemble average pressure waveforms were obtained for these sites for each patient and analysed to obtain the reservoir pressure [Pr(t)] and the excess pressure [Px(t)] at each aortic position. RESULTS:Systolic blood pressure increased at a rate of 2.1?mmHg per site along the aorta, whereas diastolic blood pressure was effectively constant. Maximum Pr decreased only slightly along the aorta (changing by -0.7?mmHg per site), whereas the maximum of Px increased from the proximal to distal aorta (+4.1?mmHg per site; P?
SUBMITTER: Narayan O
PROVIDER: S-EPMC5581543 | biostudies-literature | 2017 Oct
REPOSITORIES: biostudies-literature
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