Blood resistivity and its implications for the calculation of cardiac output by the thoracic electrical impedance technique

1977 ◽  
Vol 3 (2) ◽  
pp. 63-67 ◽  
Author(s):  
S. N. Mohapatra ◽  
Kate L. Costeloe ◽  
D. W. Hill
Keyword(s):  
Cardiac Output ◽  
Electrical Impedance ◽  
Blood Resistivity ◽  
Thoracic Electrical Impedance ◽  
Impedance Technique

Origin of cardiac-related thoracic electrical impedance variations in lambs

1991 ◽  
Vol 71 (3) ◽  
pp. 1025-1031 ◽  
Author(s):  
R. B. Cotton ◽  
D. P. Lindstrom ◽  
H. W. Sundell ◽  
J. W. Hammon ◽  
A. Silberberg ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Pulmonary Artery ◽  
Stroke Volume ◽  
Electrical Impedance ◽  
Linear Regression Analysis ◽  
Multivariate Linear Regression Analysis ◽  
Venous Flow ◽  
Thoracic Electrical Impedance ◽  
Negative Effect ◽  
Positive Effect

Cardiac-related deflections in thoracic electrical impedance have been thought to correlate sufficiently well with cardiac stroke volume to be used as the basis for a noninvasive estimation of cardiac output. To determine more precisely the physiological origin of the impedance deflection (DZ), we regarded right ventricular stroke volume (SVa) as the sum of two components: 1) that part of SVa responsible for the transient increment in pulmonary blood volume within a cardiac cycle, SVa-v and 2) the remaining part of SVa, (SVa-SVa-v). SVa-v was measured in lambs by integration of the difference between pulmonary arterial and pulmonary venous flow. SVa and its components were varied experimentally by opening and closing an aorticocaval shunt or by inflating and deflating a cuff implanted around the pulmonary artery. DZ was measured using a tetrapolar disk electrode system. Multivariate linear regression analysis revealed that SVa-v had a significant positive effect on DZ, and, at the same time, (SVa-SVa-v) had a significant negative effect on DZ. In the pulmonary artery occluder model, the positive effect of SVa-v dominated the opposing negative effect of (SVa - SVa-v) so that the net effect of SVa on DZ was positive and significant. In the aorticocaval shunt model, these effects opposed each other to the extent that there was no significant correlation between SVa and DZ. These results shed new light on the physiological origin of DZ. They also demonstrate that use of DZ to measure acute changes in cardiac output may yield misleading results. Changes or the lack of changes in thoracic electrical impedance do not necessarily reflect cardiac output status.

COMPARISON OF ELECTRICAL IMPEDANCE AND THERMAL DILUTION MEASURED CARDIAC OUTPUT IN THE CRITICAL CARE SETTING

1985 ◽  
Vol 13 (4) ◽  
pp. 305 ◽  
Author(s):  
William V. Judy ◽  
David J. Powner ◽  
Kirk Parr ◽  
Robert Demeter ◽  
Christopher Bates ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Critical Care ◽  
Electrical Impedance ◽  
Care Setting ◽  
Critical Care Setting ◽  
Thermal Dilution

On-line blood viscosity monitoring in vivo with a central venous catheter, using electrical impedance technique

2013 ◽  
Vol 41 ◽  
pp. 595-601 ◽  
Author(s):  
Gheorghe A.M. Pop ◽  
Laurens L.A. Bisschops ◽  
Blagoy Iliev ◽  
Pieter C. Struijk ◽  
Johannes G. van der Hoeven ◽  
...  
Keyword(s):  
Central Venous Catheter ◽  
Blood Viscosity ◽  
Electrical Impedance ◽  
Venous Catheter ◽  
Central Venous ◽  
Impedance Technique ◽  
On Line

Estimation of cardiac output by electrical impedance during arm exercise in women

1981 ◽  
Vol 51 (6) ◽  
pp. 1488-1492 ◽  
Author(s):  
D. S. Miles ◽  
M. N. Sawka ◽  
S. W. Wilde ◽  
B. M. Doerr ◽  
M. A. Frey ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Electrical Impedance ◽  
Arm Exercise

Brain Tumor Localization Using an Electrical Impedance Technique

1968 ◽  
Vol 28 (1) ◽  
pp. 35-44 ◽  
Author(s):  
L. W. Organ ◽  
R. R. Tasker ◽  
N. F. Moody
Keyword(s):  
Brain Tumor ◽  
Electrical Impedance ◽  
Tumor Localization ◽  
Impedance Technique
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