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New ambulatory impedance cardiograph validated against the Minnesota Impedance Cardiograph

Published online by Cambridge University Press:  30 April 2001

PAUL A. NAKONEZNY ,
RAY B. KOWALEWSKI ,
JOHN M. ERNST ,
LOUISE C. HAWKLEY ,
DAVID L. LOZANO ,
DANIEL A. LITVACK ,
GARY G. BERNTSON ,
JOHN J. SOLLERS ,
PAUL KIZAKEVICH  and
JOHN T. CACIOPPO
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PAUL A. NAKONEZNY
Affiliation:
Veterans Affairs Medical Center and University of Oklahoma Health Sciences Center, Oklahoma City, USA
RAY B. KOWALEWSKI
Affiliation:
The Ohio State University, Columbus, USA
JOHN M. ERNST
Affiliation:
The Ohio State University, Columbus, USA
LOUISE C. HAWKLEY
Affiliation:
The Ohio State University, Columbus, USA
DAVID L. LOZANO
Affiliation:
The Ohio State University, Columbus, USA
DANIEL A. LITVACK
Affiliation:
The Ohio State University, Columbus, USA
GARY G. BERNTSON
Affiliation:
The Ohio State University, Columbus, USA
JOHN J. SOLLERS
Affiliation:
Veterans Affairs Medical Center and University of Oklahoma Health Sciences Center, Oklahoma City, USA
PAUL KIZAKEVICH
Affiliation:
Research Triangle Institute, Research Triangle Park, North Carolina, USA
JOHN T. CACIOPPO
Affiliation:
The University of Chicago, USA
WILLIAM R. LOVALLO
Affiliation:
Veterans Affairs Medical Center and University of Oklahoma Health Sciences Center, Oklahoma City, USA
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Abstract

The validity and reliability of a new ambulatory impedance cardiograph (AZCG) was tested against the Minnesota Impedance Cardiograph (ZCG) during rest, orthostasis, and mental stress. Impedance cardiography allows noninvasive assessment of stroke volume, cardiac output, and systolic time intervals. A reliable ambulatory device would allow studies outside the lab. The devices were compared at two sites in healthy subjects. In both studies, the AZCG tracked changes across conditions closely with the ZCG (all Period × Device interactions were nonsignificant). Pearson rs, were .65 to .93, random intraclass correlation coefficients ranged from .80 to .98, indicating high degrees of shared measurement variance, and Cronbach's alpha indicated very good internal reliabilities (.91 to .99). Relative to the ZCG, the new AZCG appears to provide valid and reliable estimates of cardiac function at rest and during behavioral challenges in the lab.

Keywords

Impedance cardiographyAmbulatory monitoringCardiac outputValidityReliability.
Type
Research Article
Information
Psychophysiology , Volume 38 , Issue 3 , May 2001 , pp. 465 - 473
Copyright
2001 Society for Psychophysiological Research

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