A Terminal/Time Share Based Method for Interactive Left Ventricular Volume Estimation

1976 ◽  
Vol SMC-6 (2) ◽  
pp. 134-138 ◽  
Author(s):  
R. P. Kruger ◽  
S. Hui
Keyword(s):  
Left Ventricular Volume ◽  
Ventricular Volume ◽  
Left Ventricular ◽  
Volume Estimation ◽  
Terminal Time ◽  
Time Share

Left ventricular stroke volume by single and dual excitation of conductance catheter in dogs

1993 ◽  
Vol 264 (6) ◽  
pp. H2198-H2207 ◽  
Author(s):  
P. Steendijk ◽  
E. T. Van der Velde ◽  
J. Baan
Keyword(s):  
Stroke Volume ◽  
Left Ventricular Volume ◽  
Ventricular Volume ◽  
Left Ventricular ◽  
Volume Estimation ◽  
Conductance Catheter ◽  
Homogeneous Electric Field ◽  
Conductance Method ◽  
Wide Range ◽  
Excitation Method

The conductance method employs a multielectrode catheter to measure intracavitary electric conductance from which left ventricular volume is estimated. A dual-excitation method introduced by us uses a more homogeneous electric field and thereby should enable more accurate volume estimation. In six anesthetized open-chest dogs we compared stroke volume obtained from electromagnetic flow probes with the conventional single-excitation method and with the new dual-excitation conductance method. Caval occlusion and left atrial hemorrhage were used to obtain a wide range of stroke volumes. The slope of the relation between stroke volume calculated from the flow probes and from the conductance catheter increased significantly (P < 0.001) from 0.635 with single excitation to 0.835 with dual excitation, but the interanimal variability was not reduced. The linearity of the relation was substantially improved.

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