The intra- and interobserver variability of impedance cardiography in patients at rest and during exercise

H H Woltjer, H J Bogaard, P M de Vries

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We studied the intra- and interobserver variability in the calculation of stroke volume by the impedance technique, using the recently proposed refinements in the electrode configuration and signal processing. Three groups of patients were included in this study: ten stable cardiac patients who underwent a diagnostic heart catheterization, ten patients 24-26 h after coronary artery bypass surgery and ten patients with severe chronic obstructive pulmonary disease (COPD). The first two groups were studied at rest and the COPD group during submaximal exercise. The intra-observer variability was 4.2%, 3.9-4.0% and 6.0-6.9% for the catheterized, surgical and COPD groups, respectively. The interobserver variability was 4.3%, 2.6% and 2.4%, respectively. It is concluded that highly reproducible data can be obtained with the newly proposed impedance technique in patients at rest and exercise which may be comparable or superior to other techniques used in clinical settings.

Original languageEnglish
Pages (from-to)171-8
Number of pages8
JournalPhysiological Measurement
Volume17
Issue number3
Publication statusPublished - Aug 1996

Cite this

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title = "The intra- and interobserver variability of impedance cardiography in patients at rest and during exercise",
abstract = "We studied the intra- and interobserver variability in the calculation of stroke volume by the impedance technique, using the recently proposed refinements in the electrode configuration and signal processing. Three groups of patients were included in this study: ten stable cardiac patients who underwent a diagnostic heart catheterization, ten patients 24-26 h after coronary artery bypass surgery and ten patients with severe chronic obstructive pulmonary disease (COPD). The first two groups were studied at rest and the COPD group during submaximal exercise. The intra-observer variability was 4.2{\%}, 3.9-4.0{\%} and 6.0-6.9{\%} for the catheterized, surgical and COPD groups, respectively. The interobserver variability was 4.3{\%}, 2.6{\%} and 2.4{\%}, respectively. It is concluded that highly reproducible data can be obtained with the newly proposed impedance technique in patients at rest and exercise which may be comparable or superior to other techniques used in clinical settings.",
keywords = "Cardiac Catheterization, Cardiography, Impedance, Coronary Vessels/surgery, Exercise/physiology, Forced Expiratory Volume, Humans, Lung Diseases, Obstructive/physiopathology, Middle Aged, Observer Variation, Rest/physiology, Stroke Volume/physiology",
author = "Woltjer, {H H} and Bogaard, {H J} and {de Vries}, {P M}",
year = "1996",
month = "8",
language = "English",
volume = "17",
pages = "171--8",
journal = "Physiological Measurement",
issn = "0967-3334",
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The intra- and interobserver variability of impedance cardiography in patients at rest and during exercise. / Woltjer, H H; Bogaard, H J; de Vries, P M.

In: Physiological Measurement, Vol. 17, No. 3, 08.1996, p. 171-8.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The intra- and interobserver variability of impedance cardiography in patients at rest and during exercise

AU - Woltjer, H H

AU - Bogaard, H J

AU - de Vries, P M

PY - 1996/8

Y1 - 1996/8

N2 - We studied the intra- and interobserver variability in the calculation of stroke volume by the impedance technique, using the recently proposed refinements in the electrode configuration and signal processing. Three groups of patients were included in this study: ten stable cardiac patients who underwent a diagnostic heart catheterization, ten patients 24-26 h after coronary artery bypass surgery and ten patients with severe chronic obstructive pulmonary disease (COPD). The first two groups were studied at rest and the COPD group during submaximal exercise. The intra-observer variability was 4.2%, 3.9-4.0% and 6.0-6.9% for the catheterized, surgical and COPD groups, respectively. The interobserver variability was 4.3%, 2.6% and 2.4%, respectively. It is concluded that highly reproducible data can be obtained with the newly proposed impedance technique in patients at rest and exercise which may be comparable or superior to other techniques used in clinical settings.

AB - We studied the intra- and interobserver variability in the calculation of stroke volume by the impedance technique, using the recently proposed refinements in the electrode configuration and signal processing. Three groups of patients were included in this study: ten stable cardiac patients who underwent a diagnostic heart catheterization, ten patients 24-26 h after coronary artery bypass surgery and ten patients with severe chronic obstructive pulmonary disease (COPD). The first two groups were studied at rest and the COPD group during submaximal exercise. The intra-observer variability was 4.2%, 3.9-4.0% and 6.0-6.9% for the catheterized, surgical and COPD groups, respectively. The interobserver variability was 4.3%, 2.6% and 2.4%, respectively. It is concluded that highly reproducible data can be obtained with the newly proposed impedance technique in patients at rest and exercise which may be comparable or superior to other techniques used in clinical settings.

KW - Cardiac Catheterization

KW - Cardiography, Impedance

KW - Coronary Vessels/surgery

KW - Exercise/physiology

KW - Forced Expiratory Volume

KW - Humans

KW - Lung Diseases, Obstructive/physiopathology

KW - Middle Aged

KW - Observer Variation

KW - Rest/physiology

KW - Stroke Volume/physiology

M3 - Article

VL - 17

SP - 171

EP - 178

JO - Physiological Measurement

JF - Physiological Measurement

SN - 0967-3334

IS - 3

ER -