Why the natural frequency and the damping coefficient do not evaluate the dynamic response of clinically used pressure monitoring circuits correctly

Watanabe, Hiroaki; Yagi, Shinichi

doi:10.1007/s00540-020-02843-2

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…As in previous works [1,2,4] , we used a blood pressure wave calibrator (601A, Bio-Tek, IN, USA) that can generate square waves and accurately simulate human pressure waves with consideration of their frequency characteristics. The pressure monitoring circuit was lled with saline and connected between two (input/output) pressure transducers (DTXplus, Merit Medical Systems, Utah, USA) and these two signals were sent to two pressure monitors (BSM-1700, Nihon Kohden, Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

“…In 1981, Gardner recommended a new dynamic response evaluation method using the natural frequency and damping coe cient [2] . This method is now widely used [3] , but the natural frequency is obtained from the phase spectrum curve in that method, not from the more important amplitude spectrum curve described above [4] . We reported that the dynamic response of pressure monitoring circuits cannot be evaluated by the natural frequency and damping coe cient [4] .…”

Section: Introductionmentioning

confidence: 99%

“…This method is now widely used [3] , but the natural frequency is obtained from the phase spectrum curve in that method, not from the more important amplitude spectrum curve described above [4] . We reported that the dynamic response of pressure monitoring circuits cannot be evaluated by the natural frequency and damping coe cient [4] . Therefore, we need a new quantitative parameter for dynamic response evaluation and here we propose a new parameter for evaluating the dynamic response of pressure monitoring circuits.…”

Section: Introductionmentioning

confidence: 99%

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A New Parameter for Dynamic Response Evaluation

Hirahata

Hashimoto

Watanabe

et al. 2023

Preprint

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Purpose Obtaining accurate invasive blood pressure readings requires excellent dynamic response of the pressure monitoring circuit. In 2006 and 2020, we 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, we propose a new parameter for evaluating the dynamic response of a pressure monitoring circuit. Methods 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 our step response analysis program. Arterial pressure catheters with length of 30, 60, 150, and 210 cm were prepared to investigate "gain at 10 Hz" and systolic blood pressure changes. Results 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. Conclusions The necessary gain at 10 Hz is determined by how much difference in systolic blood pressure is acceptable. Clinically, a difference of 5 mmHg or less is considered acceptable. Therefore, in order to satisfy this condition, the gain at 10 Hz must be 1.2 or less. The gain at 10 Hz is sufficiently useful as an index for obtaining correct blood pressure.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Parameter for Dynamic Response Evaluation

Hirahata

Hashimoto

Watanabe

et al. 2023

Preprint

Self Cite

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The 10 Hz dynamic response of a fluid-filled pressure monitoring system is a novel alternative to the fast flush test and indicative of unacceptable systolic pressure overshoot

Hirahata,

Hashimoto,

Watanabe

et al. 2024

J Clin Monit Comput

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Towards the automatic detection and correction of abnormal arterial pressure waveforms

Michard

2024

J Clin Monit Comput

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Both over and underdamping of the arterial pressure waveform are frequent during continuous invasive radial pressure monitoring. They may influence systolic blood pressure measurements and the accuracy of cardiac output monitoring with pulse wave analysis techniques. It is therefore recommended to regularly perform fast flush tests to unmask abnormal damping. Smart algorithms have recently been developed for the automatic detection of abnormal damping. In case of overdamping, air bubbles, kinking, and partial obstruction of the arterial catheter should be suspected and eliminated. In the case of underdamping, resonance filters may be necessary to normalize the arterial pressure waveform and ensure accurate hemodynamic measurements.

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Why the natural frequency and the damping coefficient do not evaluate the dynamic response of clinically used pressure monitoring circuits correctly

Cited by 3 publications

References 4 publications

A New Parameter for Dynamic Response Evaluation

A New Parameter for Dynamic Response Evaluation

The 10 Hz dynamic response of a fluid-filled pressure monitoring system is a novel alternative to the fast flush test and indicative of unacceptable systolic pressure overshoot

Towards the automatic detection and correction of abnormal arterial pressure waveforms

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