Automatic Correction of Left-Ventricular Pressure Waveform Using the Natural Observation Method

Jun-ichi HORI; Yoshiaki SAITOH; Tohru KIRYU; Taizo IIJIMA

Automatic Correction of Left-Ventricular Pressure Waveform Using the Natural Observation Method

Jun-ichi HORI, Yoshiaki SAITOH, Tohru KIRYU, Taizo IIJIMA

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The pressure waveforms indicated on a catheter manometer system are subject to serious distortion due to the resonance of the catheter itself, or the compliance of a particular transducer. Although several methods have been proposed for improving those characteristics, they ahave never been put into practice. We have focused on the transfer function of the catheter manometer, and made a pilot system, using the natural observation method. This method has been suggested as a means of studying the structure of the instantaneous waveform. In this manner, we were able to increace the bandwidth in the ferquency domain and reduce the ringing in the time domain. Correction was performed automatically, using a step wave. Reproduction of the waveform with a flushing device, was a task of equal simplicity, that allowed us to estimate the system parameters so that the response waveform became step-like. In the experiment, our system provided distortion-free left-ventricular pressure waveform measurements and exact evaluation of the cardiac pumping system. The values obtained came much closer to the original figures arrived at by the catheter-tip manometer system.

Publication: IEICE TRANSACTIONS on Information Vol.E75-D No.6 pp.909-915

Publication Date: 1992/11/25

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Type of Manuscript: PAPER

Category: Medical Electronics and Medical Information

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Jun-ichi HORI, Yoshiaki SAITOH, Tohru KIRYU, Taizo IIJIMA, "Automatic Correction of Left-Ventricular Pressure Waveform Using the Natural Observation Method" in IEICE TRANSACTIONS on Information, vol. E75-D, no. 6, pp. 909-915, November 1992, doi: .
Abstract: The pressure waveforms indicated on a catheter manometer system are subject to serious distortion due to the resonance of the catheter itself, or the compliance of a particular transducer. Although several methods have been proposed for improving those characteristics, they ahave never been put into practice. We have focused on the transfer function of the catheter manometer, and made a pilot system, using the natural observation method. This method has been suggested as a means of studying the structure of the instantaneous waveform. In this manner, we were able to increace the bandwidth in the ferquency domain and reduce the ringing in the time domain. Correction was performed automatically, using a step wave. Reproduction of the waveform with a flushing device, was a task of equal simplicity, that allowed us to estimate the system parameters so that the response waveform became step-like. In the experiment, our system provided distortion-free left-ventricular pressure waveform measurements and exact evaluation of the cardiac pumping system. The values obtained came much closer to the original figures arrived at by the catheter-tip manometer system.
URL: https://global.ieice.org/en_transactions/information/10.1587/e75-d_6_909/_p

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@ARTICLE{e75-d_6_909,
author={Jun-ichi HORI, Yoshiaki SAITOH, Tohru KIRYU, Taizo IIJIMA, },
journal={IEICE TRANSACTIONS on Information},
title={Automatic Correction of Left-Ventricular Pressure Waveform Using the Natural Observation Method},
year={1992},
volume={E75-D},
number={6},
pages={909-915},
abstract={The pressure waveforms indicated on a catheter manometer system are subject to serious distortion due to the resonance of the catheter itself, or the compliance of a particular transducer. Although several methods have been proposed for improving those characteristics, they ahave never been put into practice. We have focused on the transfer function of the catheter manometer, and made a pilot system, using the natural observation method. This method has been suggested as a means of studying the structure of the instantaneous waveform. In this manner, we were able to increace the bandwidth in the ferquency domain and reduce the ringing in the time domain. Correction was performed automatically, using a step wave. Reproduction of the waveform with a flushing device, was a task of equal simplicity, that allowed us to estimate the system parameters so that the response waveform became step-like. In the experiment, our system provided distortion-free left-ventricular pressure waveform measurements and exact evaluation of the cardiac pumping system. The values obtained came much closer to the original figures arrived at by the catheter-tip manometer system. },
keywords={},
doi={},
ISSN={},
month={November},}

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TY - JOUR
TI - Automatic Correction of Left-Ventricular Pressure Waveform Using the Natural Observation Method
T2 - IEICE TRANSACTIONS on Information
SP - 909
EP - 915
AU - Jun-ichi HORI
AU - Yoshiaki SAITOH
AU - Tohru KIRYU
AU - Taizo IIJIMA
PY - 1992
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E75-D
IS - 6
JA - IEICE TRANSACTIONS on Information
Y1 - November 1992
AB - The pressure waveforms indicated on a catheter manometer system are subject to serious distortion due to the resonance of the catheter itself, or the compliance of a particular transducer. Although several methods have been proposed for improving those characteristics, they ahave never been put into practice. We have focused on the transfer function of the catheter manometer, and made a pilot system, using the natural observation method. This method has been suggested as a means of studying the structure of the instantaneous waveform. In this manner, we were able to increace the bandwidth in the ferquency domain and reduce the ringing in the time domain. Correction was performed automatically, using a step wave. Reproduction of the waveform with a flushing device, was a task of equal simplicity, that allowed us to estimate the system parameters so that the response waveform became step-like. In the experiment, our system provided distortion-free left-ventricular pressure waveform measurements and exact evaluation of the cardiac pumping system. The values obtained came much closer to the original figures arrived at by the catheter-tip manometer system.
ER -