New ambulatory impedance cardiograph validated against the Minnesota Impedance Cardiograph

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; John T. Cacioppo; William R. Lovallo

doi:10.1017/S0048577201991103

New ambulatory impedance cardiograph validated against the Minnesota Impedance Cardiograph

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, John T. Cacioppo, William R. Lovallo

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

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.

Original language	English (US)
Pages (from-to)	465-473
Number of pages	9
Journal	Psychophysiology
Volume	38
Issue number	3
DOIs	https://doi.org/10.1017/S0048577201991103
State	Published - 2001

Keywords

Ambulatory monitoring
Cardiac output
Impedance cardiography
Reliability
Validity

ASJC Scopus subject areas

Experimental and Cognitive Psychology
Neuropsychology and Physiological Psychology
Physiology (medical)
Physiology

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title = "New ambulatory impedance cardiograph validated against the Minnesota Impedance Cardiograph",

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 = "Ambulatory monitoring, Cardiac output, Impedance cardiography, Reliability, Validity",

author = "Nakonezny, {Paul A.} and Kowalewski, {Ray B.} and Ernst, {John M.} and Hawkley, {Louise C.} and Lozano, {David L.} and Litvack, {Daniel A.} and Berntson, {Gary G.} and Sollers, {John J.} and Paul Kizakevich and Cacioppo, {John T.} and Lovallo, {William R.}",

year = "2001",

doi = "10.1017/S0048577201991103",

language = "English (US)",

volume = "38",

pages = "465--473",

journal = "Psychophysiology",

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AU - Nakonezny, Paul A.

AU - Kowalewski, Ray B.

AU - Ernst, John M.

AU - Hawkley, Louise C.

AU - Lozano, David L.

AU - Litvack, Daniel A.

AU - Berntson, Gary G.

AU - Sollers, John J.

AU - Kizakevich, Paul

AU - Cacioppo, John T.

AU - Lovallo, William R.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

KW - Ambulatory monitoring

KW - Cardiac output

KW - Impedance cardiography

KW - Reliability

KW - Validity

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New ambulatory impedance cardiograph validated against the Minnesota Impedance Cardiograph

Abstract

Keywords

ASJC Scopus subject areas

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