Impedance cardiograms reliably estimate beat-by-beat changes of left ventricular stroke volume in humans. Cardiovasc Res 1984 Jun;18(6):354-60
Date
06/01/1984Pubmed ID
6744356DOI
10.1093/cvr/18.6.354Scopus ID
2-s2.0-85047676290 (requires institutional sign-in at Scopus site) 79 CitationsAbstract
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 MJAuthor
Thomas J. Ebert MD, PhD Adjunct Professor in the Anesthesiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AgedCardiac Catheterization
Cardiac Output
Cardiography, Impedance
Coronary Disease
Female
Heart
Heart Diseases
Heart Ventricles
Humans
Male
Middle Aged
Plethysmography, Impedance