Faculty Collaboration Database

Impedance cardiograms reliably estimate beat-by-beat changes of left ventricular stroke volume in humans. Cardiovasc Res 1984 Jun;18(6):354-60

Date

06/01/1984

Pubmed ID

6744356

DOI

10.1093/cvr/18.6.354

Scopus ID

2-s2.0-85047676290 (requires institutional sign-in at Scopus site)   79 Citations

Abstract

Linear regression was used to compare stroke volumes calculated from tetrapolar impedance cardiograms and simultaneous left ventriculograms in 14 patients undergoing diagnostic left heart catheterisation. We calculated three to five consecutive stroke volumes from each ventriculogram. Left ventricular stroke volumes estimated by the two methods correlated closely: the correlation coefficients from pairs of data obtained from individual patients ranged between 0.77 and 1.00 (average = 0.91), and the correlation coefficient for pooled data (all pairs from all subjects) was 0.79 (p less than 0.001). Changes in left ventricular stroke volume measured with the two methods also correlated well (r = 0.89 for pooled data, p less than 0.001). The results suggest that impedance cardiograms provide reliable estimates of changes of beat-by-beat left ventricular stroke volumes and reasonable estimates of absolute levels of beat-by-beat stroke volumes in humans.

Author List

Ebert TJ, Eckberg DL, Vetrovec GM, Cowley MJ

Author

Thomas J. Ebert MD, PhD Adjunct Professor in the Anesthesiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Aged
Cardiac Catheterization
Cardiac Output
Cardiography, Impedance
Coronary Disease
Female
Heart
Heart Diseases
Heart Ventricles
Humans
Male
Middle Aged
Plethysmography, Impedance