Journal ArticleDOI
The influence of extravascular lung water on cardiac output measurements using thoracic impedance cardiography
E. Raaijmakers,Th. J. C. Faes,Peter W.A. Kunst,Jan Bakker,Johannes H. Rommes,H. G. Goovaerts,R. M. Heethaar +6 more
Reads0
Chats0
TLDR
The effects of pulmonary oedema on the accuracy of TIC measurements can better be understood with the parallel cylinder model, as the Kubicek equation still holds when pulmonary Oedema is present, in contrast to the Sramek-Bernstein equation.Abstract:
The purpose of this study was to investigate the influence of pulmonary oedema as measured with the double indicator dilution technique on the accuracy of cardiac output (CO) measurement using thoracic impedance cardiography (TIC) compared with thermodilution in thirteen sepsis patients. Differences in the Kubicek and Sramek-Bernstein equation with respect to pulmonary oedema were explored theoretically and experimentally. From a parallel two cylinder model a hypothesis can be derived that CO determined with the Kubicek equation is oedema independent, whereas CO determined using the Sramek-Bernstein equation is oedema dependent. Experimentally, CO determined using Kubicek's equation correlated better with thermodilution CO (r = 0.75) than CO determined with the Sramek-Bernstein equation (r = 0.25). The effect of oedema on the accuracy of TIC was investigated by comparing the differences in the CO of impedance and thermodilution to the extravascular lung water index. For the Kubicek equation the difference was not influenced by oedema (r = 0.04, p = 0.84), whereas for the Sramek-Bernstein equation the difference was affected by oedema (r = 0.39, p = 0.05). Thus, the effects of pulmonary oedema on the accuracy of TIC measurements can better be understood with the parallel cylinder model. Moreover, the Kubicek equation still holds when pulmonary oedema is present, in contrast to the Sramek-Bernstein equation.read more
Citations
More filters
Journal ArticleDOI
A critical review of the ability of continuous cardiac output monitors to measure trends in cardiac output.
TL;DR: A literature review was performed to identify articles published between 1997 and 2009 that compared methods of continuous CO measurement and found an acceptable statistical method for trending ability.
Journal ArticleDOI
Stroke volume equation for impedance cardiography.
TL;DR: Compared with TDCO, equation N, using a square-root transformation for dZ/dtmax/Z0, and a mass-based VC was superior to existing transthoracic impedance techniques for SV and CO determination.
Journal ArticleDOI
Impedance cardiography: Pulsatile blood flow and the biophysical and electrodynamic basis for the stroke volume equations
TL;DR: The new method conceptualizes VEPT as the intrathoracic blood volume (ITBV, mL), which is approximated through allometric equivalents of body mass (aMb) in contrast to the classical two-element parallel conduction model, the new method comprises a three-compartment model, which incorporates excess extra-vascular lung water (EVLW) as a component of both Z0 and VEPt.
Journal ArticleDOI
Impedance cardiography (electrical velocimetry) and transthoracic echocardiography for non-invasive cardiac output monitoring in pediatric intensive care patients: a prospective single-center observational study
Martin Blohm,Denise Obrecht,Jana Hartwich,Goetz C. Mueller,Jan Felix Kersten,Jochen Weil,Dominique Singer +6 more
TL;DR: This study shows that EV is comparable with aortic flow-based TTE for pediatric patients, and Mechanical ventilation, non-invasive continuous positive airway pressure ventilation, body weight, and secondary abdominal closure were factors that significantly affected comparison of the methods.
Patent
Apparatus for monitoring chf patients using bio-impedance technique
TL;DR: In this paper, an apparatus and method for making corrected impedance images of the chest includes an impedance imaging data acquisition system (609,611) which acquires impedance images from the chest, an electrocardiograph (618), and a data analyzer (616).
References
More filters
Journal ArticleDOI
Statistical methods for assessing agreement between two methods of clinical measurement.
TL;DR: An alternative approach, based on graphical techniques and simple calculations, is described, together with the relation between this analysis and the assessment of repeatability.
Journal ArticleDOI
An Expanded Definition of the Adult Respiratory Distress Syndrome
TL;DR: An expanded definition of ARDS is proposed that takes into account new knowledge about adult respiratory distress syndrome and its clinical features, physiologic disturbances, prognosis, and pathologic findings.
Journal Article
Development and evaluation of an impedance cardiac output system
TL;DR: Impedance cardiac output values simultaneously compared with dye dilution techniques under rest and exercise conditions are compared to show the difference in output values between the two techniques under different exercise conditions.