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- W3147444494 abstract "The dynamic geometry of the left ventricle was assessed with the use of chronically implanted pulse-transit ultrasonic dimension transducers. The orientation of the transducers allowed the measurement of left ventricular minor and major axis diameters and equatorial wall thickness in the conscious dog. The left ventricle was modeled as a three-dimensional, prolate ellipsoidal shell. Left ventricular and pleural pressures were measured with high fidelity micromanometers. Aortic blood flow was obtained with electromagnetic flow probes. To test the assumptions inherent in this technique, left ventricular mass, internal volume, stroke volume, and peak aortic flow were computed from the dimension data and compared to directly measured values. Correlation coefficients of 0.95 or greater were obtained for each of these comparisons. In addition, the calculated left ventricular mass was constant to within +/- 6% of the mean value throughout the cardiac cycle. We found that the dynamic contraction pattern of the le..." @default.
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- W3147444494 date "1976-01-01" @default.
- W3147444494 modified "2023-09-23" @default.
- W3147444494 title "The three-dimensional dynamic geometry of the left ventricle in the conscious dog." @default.
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