Key result
The new ambulatory impedance cardiograph (AZCG) demonstrated high validity and reliability compared to the Minnesota Impedance Cardiograph, with intraclass correlation coefficients of 0.80 to 0.98.
Why the study?
Does the new ambulatory impedance cardiograph (AZCG) provide valid and reliable estimates of cardiac function compared to the Minnesota Impedance Cardiograph (ZCG) in healthy subjects?
Observational
Yes
Does the new ambulatory impedance cardiograph (AZCG) provide valid and reliable estimates of cardiac function compared to the Minnesota Impedance Cardiograph (ZCG) in healthy subjects?
The new ambulatory impedance cardiograph is a valid and reliable tool for noninvasive assessment of cardiac function outside the laboratory.
Answers are grounded in this paper and cite their sources.
May facilitate ambulatory cardiac monitoring in research; leaves open clinical adoption pending patient outcome data.
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 x 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.
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Nakonezny et al. (2001) conducted an observational in Healthy subjects. Ambulatory impedance cardiograph (AZCG) vs. Minnesota Impedance Cardiograph (ZCG) was evaluated on Validity and reliability of cardiac function estimates (stroke volume, cardiac output, and systolic time intervals) (ICC 0.80-0.98). The new ambulatory impedance cardiograph (AZCG) demonstrated high validity and reliability compared to the Minnesota Impedance Cardiograph, with intraclass correlation coefficients of 0.80 to 0.98.
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