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Journal of Clinical Monitoring and Computing

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01-12-2012 | Original Research

Additional hemodynamic measurements with an esophageal Doppler monitor: a preliminary report of compliance, force, kinetic energy, and afterload in the clinical setting

Authors: Glen Atlas, David Brealey, Sunil Dhar, Gerhard Dikta, Meryvn Singer

Published in: Journal of Clinical Monitoring and Computing | Issue 6/2012

Abstract

The esophageal Doppler monitor (EDM) is a minimally-invasive hemodynamic device which evaluates both cardiac output (CO), and fluid status, by estimating stroke volume (SV) and calculating heart rate (HR). The measurement of these parameters is based upon a continuous and accurate approximation of distal thoracic aortic blood flow. Furthermore, the peak velocity (PV) and mean acceleration (MA), of aortic blood flow at this anatomic location, are also determined by the EDM. The purpose of this preliminary report is to examine additional clinical hemodynamic calculations of: compliance (C), kinetic energy (KE), force (F), and afterload (TSVR_i). These data were derived using both velocity-based measurements, provided by the EDM, as well as other contemporaneous physiologic parameters. Data were obtained from anesthetized patients undergoing surgery or who were in a critical care unit. A graphical inspection of these measurements is presented and discussed with respect to each patient’s clinical situation. When normalized to each of their initial values, F and KE both consistently demonstrated more discriminative power than either PV or MA. The EDM offers additional applications for hemodynamic monitoring. Further research regarding the accuracy, utility, and limitations of these parameters is therefore indicated.

Available only for authorised users

The EDM probe can be used with those laryngeal mask airways which have an esophageal port.

Flow time (FT) is also referred to as left ventricle ejection time (LVET).

The American Society of Anesthesiologists (ASA) physical status classification system is summarized in Appendix 3.

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Title: Additional hemodynamic measurements with an esophageal Doppler monitor: a preliminary report of compliance, force, kinetic energy, and afterload in the clinical setting
Authors: Glen Atlas
David Brealey
Sunil Dhar
Gerhard Dikta
Meryvn Singer
Publication date: 01-12-2012
Publisher: Springer Netherlands
Published in: Journal of Clinical Monitoring and Computing / Issue 6/2012
Print ISSN: 1387-1307
Electronic ISSN: 1573-2614
DOI: https://doi.org/10.1007/s10877-012-9386-5

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Additional hemodynamic measurements with an esophageal Doppler monitor: a preliminary report of compliance, force, kinetic energy, and afterload in the clinical setting

Abstract

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