Comparison of electrical velocimetry and transoesophageal Doppler echocardiography for measuring stroke volume and cardiac output † †Declaration of interest. This study was supported by Osypka Medical GmbH, Berlin, Germany.

Schmidt, Christina; Theilmeier, Gregor; Aken, Hugo Van; Korsmeier, P.; Wirtz, Svenja; Berendes, Elmar; Hoffmeier, A.; Meißner, Andreas

doi:10.1093/bja/aei224

Cited by 106 publications

(74 citation statements)

References 25 publications

(26 reference statements)

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“…Our findings are in accordance with the results of other studies: Schmidt et al [16] described the interchangeability of EV and transoesophageal aortic Doppler in a homogenous cohort of 37 patients undergoing coronary surgery. Suttner et al [17] reported good correlation and acceptable agreement between EV and pulmonary artery thermodilution in adult patients after cardiac surgery.…”

Section: Discussionsupporting

confidence: 93%

“…(1.018 9 SV TTE ), i.e. near the line of identity, thus highlighting the good predictability for the two methods, albeit a little less well than that found by Schmidt et al [16] and Norozi et al [18].…”

Section: Methods Comparisonmentioning

confidence: 63%

“…EV has been criticized for not correlating well or lacking sufficient agreement with the reference methods [14,15]. But there have been positive evaluations too [16][17][18][19]. And evidence is growing that there is already and will be more place for EV in daily practical work because it provides a steadily improving, more reliable and continuous overview of the patients' circulatory status [20,21].…”

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confidence: 99%

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Electrical velocimetry as a tool for measuring cardiac output in small infants after heart surgery

et al. 2012

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Section: Discussionsupporting

confidence: 93%

Section: Methods Comparisonmentioning

confidence: 63%

mentioning

confidence: 99%

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Electrical velocimetry as a tool for measuring cardiac output in small infants after heart surgery

et al. 2012

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“…As a result, there is a continuing search for a method of CO measurement that is less invasive than its predecessors. In this respect, impedance cardiography, which calculates SV and CO from changes in the instantaneous mean resistance (i.e., impedance) of a small electrical current transferred through the body, has received much attention in the last four decades because it is noninvasive, easy to use, and adapted for continuous monitoring of CO and related parameters (16).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a noninvasive continuous cardiac output monitoring system based on thoracic bioreactance

Keren¹,

Burkhoff²,

Squara³

2007

American Journal of Physiology-Heart and Circulatory Physiology

269

203

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Noninvasive cardiac output (CO) measurement can be useful in many clinical settings where invasive monitoring is not desired. Bioimpedance (intrabeat measurement of changes in transthoracic voltage amplitude in response to an injected high-frequency current) has been explored for this purpose but is limited in some clinical settings because of inherently low signal-to-noise ratio. Since changes in fluid content also induce changes in thoracic capacitive and inductive properties, we tested whether a noninvasive CO measurement could be obtained through measurement of the relative phase shift of an injected current (i.e., bioreactance). We constructed a prototype device that applies a 75-kHz current and determines the relative phase shift (dΦ/d t) of the recorded transthoracic voltage. CO was related to the product of peak dΦ/d t, heart rate, and ventricular ejection time. The preclinical study was done in nine open-chest pigs put on right heart bypass so that CO could be varied at known values. This was followed by a feasibility study in 27 postoperative patients who had a Swan-Ganz catheter (SGC). The measurements of noninvasive CO measurement and cardiopulmonary bypass pump correlated to each other ( r = 0.84) despite the large variation in CO and temperatures. Similarly, in patients, mean CO values were 5.18 and 5.17 l/min as measured by SGC and the noninvasive CO measurement system, respectively, and were highly correlated over the range of values studied ( r = 0.90). Preclinical and clinical data demonstrate the feasibility of using blood flow-related phase shifts of transthoracic electric signals to perform noninvasive continuous CO monitoring.

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“…The algorithm used is thought to be unaffected by changes in low conductivity compartments such as lung and in theory should be more accurate than bioimpedance. The technique has compared well to trans-oesophageal echocardiography [90], and bolus thermodilution with the pulmonary artery catheter [91].…”

Section: Electrical Velocimetrymentioning

confidence: 99%

Cardiac output monitoring: basic science and clinical application

2008

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Summary Derangements in the circulation are a common feature of sepsis, trauma, major surgery and other critical illnesses. Detailed evaluation of the circulation is therefore an essential aspect of the clinical management of such patients. The use of cardiac output monitoring technology is an increasingly important aspect of evaluating patients in the operating theatre, critical care unit and elsewhere. There are now a number of different technologies available for this purpose, which use a diverse range of physiological principles. A detailed understanding of the physiological principles applied by such technology is essential for safe and effective use in clinical practice. The aim of this article is to describe the physiological principles used to measure cardiac output and their application in various monitors in common clinical use.

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Comparison of electrical velocimetry and transoesophageal Doppler echocardiography for measuring stroke volume and cardiac output † †Declaration of interest. This study was supported by Osypka Medical GmbH, Berlin, Germany.

Abstract: The agreement between EV-CO and TOE-CO is clinically acceptable, and these two techniques can be used interchangeably.

Cited by 106 publications

References 25 publications

Electrical velocimetry as a tool for measuring cardiac output in small infants after heart surgery

Electrical velocimetry as a tool for measuring cardiac output in small infants after heart surgery

Evaluation of a noninvasive continuous cardiac output monitoring system based on thoracic bioreactance

Cardiac output monitoring: basic science and clinical application

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