Impedance cardiography for determination of stroke index

Keim, Hans J.; Wallace, John M.; Thurston, H.; Case, David B.; Drayer, Jan I.M.; Jh, Laragh

doi:10.1152/jappl.1976.41.5.797

Cited by 60 publications

(10 citation statements)

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“…Aust et al (1982) noted agreement between tilt-induced changes in stroke volume using the impedance method and echocardiography, and Boer et al (1979) reported similar results with thermodilution as the reference technique. In contrast, Keim et al (1976) reported poor agreement in tilt-associated changes in stroke index measured using the impedance and dye-dilution techniques.…”

Section: Discussionmentioning

confidence: 91%

“…This confirms the findings of several other groups (Boer et al, 1979;Denniston et af., 1976;Edmunds et al, 1982;Gabriel et af., 1976;Hayashi et af., 1978;Judy et al, 1969;Lababidi et al, 1971;Milsom et al, 1982Milsom et al, , 1983Naggar et al, 1975;Secher et al, 1977Secher et al, , 1979Smith et al, 1970;Tanguy et al, 1982). A few negative studies have also appeared (Keim et al, 1976;Enghoff & Lowheim, 1979). Practical factors may partially explain the negative findings as well as the imperfect agreement with the thermodilution technique.…”

Section: Discussionmentioning

confidence: 99%

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Clinical evaluation of impedance cardiography

Goldstein

Cannon

Zimlichman

et al. 1986

Clinical Physiology

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We tested the validity of thoracic impedance cardiography for measuring cardiac output in man by comparing absolute values obtained using the non-invasive impedance method with values obtained using the invasive thermodilution method. We also compared per cent changes in cardiac output using impedance cardiography and thermodilution in response to environmental manipulations including cardiac pacing and intravenous administration of ergonovine, dipyridamole, or isoproterenol. Among 19 patients, absolute values for cardiac output, using the impedance and the thermodilution techniques, agreed well (r = 0.85, P less than 0.001). The per cent change in cardiac output by impedance cardiography was positively correlated with the per cent change by thermodilution for the several manipulations (overall r = 0.87, P less than 0.001). Impedance cardiography does appear, in general, to measure cardiac output and stroke volume validly in man, even in situations where heart rate and stroke volume change in opposite directions.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Clinical evaluation of impedance cardiography

Goldstein

Cannon

Zimlichman

et al. 1986

Clinical Physiology

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“…It is associated with the intra-cardiac fluid inversion [8], [23], [24]. The O point corresponds to the peak positive deflection in ICG after the X point [8] and it is associated with rapid filling of the ventricles during wider opening of the mitral valve [14], [23].…”

Section: Icg Characterisitc Pointsmentioning

confidence: 99%

Detection of characteristic points of impedance cardiogram and validation using Doppler echocardiography

Naidu

Bagal

Pandey

et al. 2014

2014 Annual IEEE India Conference (INDICON)

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Impedance cardiography is a noninvasive technique for monitoring the variation in thoracic impedance during cardiac cycle. Estimation of the stroke volume and other cardiovascular indices using impedance cardiography requires error-free detection of characteristic points in the impedance cardiogram (ICG). A technique for automatic detection of ICG characteristic points using R peaks in ECG as reference is presented. It does not require pre-processing of the ICG signal for baseline correction and adjustment of detection parameters. The technique is validated using Doppler echocardiography as a reference technique, by recording ICG and ECG signals simultaneously along with velocity profile of blood flow at the level of left ventricular outflow tract. Application of the technique on the recordings from healthy subjects in pre-exercise and post-exercise conditions and from cardiac patients under rest condition showed a very low detection error.

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“…In general, comparisons of impedance cardiography with well-established invasive techniques have shown high correlations when averaged across reasonably healthy subjects (20), although there has been some tendency to overestimate stroke volume (2,5,7,12,17). The correlations have been much poorer in some abnormal patient populations (6,8,15), and when applied in individual subjects (1,3). Thus, the practical value of impedance cardiography for critical care monitoring and diagnostic purposes in individual patients has not yet been realized.…”

Section: Introductionmentioning

confidence: 99%