ISSN:
1438-8359
Keywords:
Frequency characteristics
;
Cathetermanometer system
;
Natural frequency
;
Damping coefficient
;
Dynamic simulation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Using a digital simulation method, we analyzed the relationship between natural frequency (f n ) and damping coefficient (Ζ) of the catheter-manometer system required for high-fidelity measurement of the pulmonary arterial pressure. The pulmonary artery pressure waveform was obtained with a catheter-tip transducer and it was fed into a dynamic simulator programmed on a computer. The original waveform and the output of the simulator were compared and judged visually for the fidelity. From this analysis, the combination of f n and Ζ was obtained and was plotted on a f n − Ζ diagram. It showed as an area, which was convex on the left side and open on the right side. The left-convex endpoint was located at a damping coefficient of about 0.7. At a lower heart rate, this area was extended to the lower frequency side, while, at a higher heart rate, this area was limited to the higher frequency side. The f n − Ζ diagram was also constructed theoretically by calculating the relations between natural frequencies and damping coefficients of a second order system with the amplitude and phase error tolerance set at +/−5% respectively. (Kinefuchi Y, Suzuki T, Takiguchi M, et al.: Natural frequency/Damping coefficient relationship of the catheter-manometer system required for high-fidelity measurement of the pulmonary arterial pressure. J Anesth 7: 419--426, 1993)
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s0054030070419
Permalink
