Literature DB >> 28864438

Measuring Stroke Volume: Impedance Cardiography vs Phase-Contrast Magnetic Resonance Imaging.

Matthew Borzage1, Kimia Heidari2, Thomas Chavez2, Istvan Seri2, John C Wood2, Stefan Blüml2.   

Abstract

BACKGROUND: Determination of cardiac output requires measurement of both heart rate and stroke volume. Techniques for measuring heart rate are widespread, and 1 technique for bedside monitoring of stroke volume is electrical impedance cardiography.
OBJECTIVES: To determine the accuracy and precision of stroke volume measured via impedance cardiography and whether the technique can be used to detect trends.
METHODS: Eleven healthy research participants (22-52 years old) were examined with simultaneous impedance cardiography and phase-contrast magnetic resonance imaging at rest and during exercise. Bland-Altman analysis with repeated-measures correction was used to compare stroke volumes determined with the 2 methods. The suitability of impedance cardiography for detecting trends in stroke volume was analyzed by using the Critchley radial limits of agreement method.
RESULTS: Phase-contrast magnetic resonance imaging indicated a mean stroke volume of 87 (SD, 16) mL at rest; in 9 volunteers, it changed during exercise (P = .04 to P < .001); in 2 volunteers, it did not (P = .32, P = .06). For the range of stroke-volume measurements (60-122 mL), impedance cardiography yielded underestimates of stroke volumes at the low end (bias, -17 mL) and overestimates at the high end (bias, +17 mL; P < .001). Corresponding 95% limits of agreement were 64 mL, a 73% overestimate or underestimate of stroke volume at rest. Critchley radial limits of agreement indicated poor concordance of stroke-volume trends.
CONCLUSIONS: Impedance cardiography had low accuracy and precision in measuring absolute stroke volume and was a poor detector of stroke-volume trends. ©2017 American Association of Critical-Care Nurses.

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Year:  2017        PMID: 28864438     DOI: 10.4037/ajcc2017488

Source DB:  PubMed          Journal:  Am J Crit Care        ISSN: 1062-3264            Impact factor:   2.228


  3 in total

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Authors:  Avichai Weissbach
Journal:  Pediatr Cardiol       Date:  2021-04-09       Impact factor: 1.655

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  3 in total

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