• J Clin Monit Comput · Feb 2018

    Influence of the marvelous™ three-way stopcock on the natural frequency and damping coefficient in blood pressure transducer kits.

    • Fujiwara Shigeki Joseph Luke SJL Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, , Keiichi Tachihara, Satoshi Mori, Kentaro Ouchi, Shoko Itakura, Michiko Yasuda, Takashi Hitosugi, Uno Imaizumi, Yoichiro Miki, Izumi Toyoguchi, Kazu-Ichi Yoshida, and Takeshi Yokoyama.
    • Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan. josephluke@dance.ocn.ne.jp.
    • J Clin Monit Comput. 2018 Feb 1; 32 (1): 63-72.

    AbstractTwo types of Planecta™ ports are commonly used as sampling ports in blood pressure transducer kits: a flat-type port (FTP) and a port with a three-way stopcock (PTS). Recently, a new type of three-way stopcock (Marvelous™) has been released as a Planecta™ counterpart, but its effects on the frequency characteristics and reliability of blood pressure monitoring have not been investigated. We assessed the influence of the Marvelous™ stopcock on the frequency characteristics of the pressure transducer kit. The basic pressure transducer kit, DT4812J, was modified by replacing one or two of the original three-way stopcocks with Marvelous™ stopcocks. The frequency characteristics (i.e., natural frequency and damping coefficient) of each kit were determined using wave parameter analysis software, and subsequently evaluated on a Gardner chart. Replacement of the original blood pressure transducer kit stopcocks with Marvelous™ stopcocks decreased the natural frequency (48.3 Hz) to 46.3 Hz or 44.8 Hz, respectively; the damping coefficient was not significantly changed. Plotting the data on a Gardner chart revealed that the changes fell within the adequate dynamic response region, indicating they were within the allowable range. Insertion of Marvelous™ stopcocks slightly affects the natural frequency of the pressure transducer kit, similar to inserting a PTS. The results indicate that the Marvelous™ stopcock is useful for accurate monitoring of arterial blood pressure, and may be recommended when insertion of two or more closed-loop blood sampling systems is necessary.

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