[en] Accurate Stroke Volume (SV) monitoring is essential for patient with cardiovascular dysfunction patients. However, direct SV measurements are not clinically feasible due to the highly invasive nature of measurement devices. Current devices for indirect monitoring of SV are shown to be inaccurate during sudden hemodynamic changes. This paper presents a novel SV estimation using readily available aortic pressure measurements and aortic cross sectional area, using data from a porcine experiment where medical interventions such as fluid replacement, dobutamine infusions, and recruitment maneuvers induced SV changes in a pig with circulatory shock. Measurement of left ventricular volume, proximal aortic pressure, and descending aortic pressure waveforms were made simultaneously during the experiment. From measured data, proximal aortic pressure was separated into reservoir and excess pressures. Beat-to-beat aortic characteristic impedance values were calculated using both aortic pressure measurements and an estimate of the aortic cross sectional area. SV was estimated using the calculated aortic characteristic impedance and excess component of the proximal aorta. The median difference between directly measured SV and estimated SV was -1.4ml with 95% limit of agreement +/- 6.6ml. This method demonstrates that SV can be accurately captured beat-to-beat during sudden changes in hemodynamic state. This novel SV estimation could enable improved cardiac and circulatory treatment in the critical care environment by titrating treatment to the effect on SV.
Disciplines :
Cardiovascular & respiratory systems Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Kamoi, Shun
Pretty, Christopher G.
Chiew, Yeong Shiong
Pironet, Antoine ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles
Davidson, Shaun
Desaive, Thomas ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles
Shaw, Geoffrey M.
Chase, J. Geoffrey
Language :
English
Title :
Stroke Volume Estimation using Aortic Pressure Measurements and Aortic Cross Sectional Area: Proof of Concept
Publication date :
August 2015
Event name :
37th International Conference of the IEEE Engineering in Medicine and Biology Society
Event organizer :
IEEE Engineering in Medicine and Biology Society
Event place :
Milan, Italy
Event date :
du 25 au 29 août 2015
Audience :
International
Main work title :
Proceedings of the 37th International Conference of the IEEE Engineering in Medicine and Biology Society
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