| Abstrakt: |
Abstract: The natural frequencies, damping coefficients, and accuracies of umbilical artery catheters were determined. The damping coefficients for the 3.5, 5.0, and 8.0 French catheters were 0.40 ± 0.04 (mean ± SD), 0.42 ± 0.05, and 0.19 ± 0.02, respectively. The natural frequencies were 24.2 ± 3.2 Hz (mean ± SD), 18.4 ± 3.5 Hz, and 26.8 ± 2.9 Hz, respectively. Measurements obtained with 3.5 and 8.0 French catheters were within 6% of the reference pressure at all pressures and rates tested. With the 5.0 French catheter, however, error greater than 10% from the reference pressure occurred when the rate was 200 pulses per minute or greater and the applied maximum pressure was 100 mm Hg or more. |
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