• Tomoki Hirahata, Shuichi Hashimoto, Hiroaki Watanabe, Shin-Ichi Yagi, Mitsutaka Edanaga, and Michiaki Yamakage.
• Department of Anesthesiology, School of Medicine, Sapporo Medical University, South-1, West-16, Chuo-ku, Sapporo, 060-8543, Japan. tomoki.hirahata@gmail.com.
• J Clin Monit Comput. 2024 Feb 4.

AbstractThe standard method for qualitatively evaluating the dynamic response is to see if the gain of the amplitude spectrum curve approaches 1 (input signal = output signal) over the frequency band of the blood pressure waveform. In a previous report, Watanabe reported that Gardner's natural frequency and damping coefficient, which are widely used as evaluation methods, do not reflect the dynamic response of the circuit. Therefore, new parameters for evaluating the dynamic response of pressure monitoring circuits were desired. In this study, arterial pressure catheters with length of 30, 60, 150, and 210 cm were prepared, and a blood pressure wave calibrator, two pressure monitors with analog output and a personal computer were used to analyze blood pressure monitoring circuits. All data collection and analytical processes were performed using step response analysis program. The gain at 10 Hz was close to 1 and the systolic blood pressure difference was small in the short circuits (30 cm, 60 cm), and the gain at 10 Hz was 1.3-1.5 in the 150 cm circuit and over 1.7 in the 210 cm circuit. The difference in systolic blood pressure increased in proportion to the length of the circuit. It could also be inferred that the gain at 10 Hz should be less than 1.2 to meet a clinically acceptable blood pressure difference. In conclusion, the gain at 10 Hz is sufficiently useful as an indicator to determine the correct systolic blood pressure.© 2024. The Author(s), under exclusive licence to Springer Nature B.V.

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