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01-09-2003 | Original Article

Beat-to-beat noninvasive stroke volume from arterial pressure and Doppler ultrasound

Authors: Johannes J. van Lieshout, Karin Toska, Erik Jan van Lieshout, Morten Eriksen, Lars Walløe, Karel H. Wesseling

Published in: European Journal of Applied Physiology | Issue 1-2/2003

Abstract

The proper understanding of the cardiovascular mechanisms involved in complaints of short-lasting dizziness and the evaluation of unexplained recurrent syncope requires continuous monitoring of cardiac stroke volume (SV) in addition to blood pressure and heart rate. The primary aim of the present study was to evaluate a pulse wave analysis method that calculates beat-to-beat flow from non-invasive arterial pressure by simulating a non-linear, time-varying model of human aortic input impedance (Modelflow; MF), by comparing MF stroke volume (SV_MF) to Doppler ultrasound (US) flow velocity SV (SV_US). A second purpose was to compare the two methods under two different conditions: the supine and head-up tilt (30°) position. SV_US and SV_MF with non-invasive arterial pressure (Finapres) as input to the aortic model were measured beat-to-beat during spontaneous supine breathing and in the passive 30° head-up tilt (HUT30) position in six normotensive healthy humans [three females, mean age 24 (21–26) years]. There were variations in supine SV track between the two methods with zero difference and a SD of the beat-to-beat difference (MF−US) of 4.2%. HUT30 induced a systematic difference of 10.5% and an increase in SD to 6.9%, which was reproducible. Beat-to-beat changes in SV in the supine resting condition were equally well assessed by both methods. Systematic differences appear during HUT30 and show opposite signs. The difference between the two methods upon a change in body position may be attributed to limitations in each method.

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Title: Beat-to-beat noninvasive stroke volume from arterial pressure and Doppler ultrasound
Authors: Johannes J. van Lieshout
Karin Toska
Erik Jan van Lieshout
Morten Eriksen
Lars Walløe
Karel H. Wesseling
Publication date: 01-09-2003
Publisher: Springer-Verlag
Published in: European Journal of Applied Physiology / Issue 1-2/2003
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-003-0901-8

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Beat-to-beat noninvasive stroke volume from arterial pressure and Doppler ultrasound

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