title: Influence of the marvelous™ three-way stopcock on the natural frequency and damping coefficient in blood pressure transducer kits.
abstract: Two 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.
authors.affiliation: Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan. josephluke@dance.ocn.ne.jp.|Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan. josephluke@dance.ocn.ne.jp.|Department of Health and Medical Engineering School of Science and Engineering, Kokushikan University, 4-28-1 Setagaya, Setagaya-ku, Tokyo, 154-8515, Japan. josephluke@dance.ocn.ne.jp.
authors.forename: Shigeki Joseph Luke
authors.initials: SJL
authors.lastname: Fujiwara
authors.affiliation: Department of Clinical Engineering, Teikyo Junior College, 6-31-1 Honmachi, Shibuya-ku, Tokyo, 151-0071, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tachihara
authors.affiliation: Clinical Engineering, Almeida Memorial Hospital, 1509-2 Miyazaki, Oita-shi, Oita, 870-1133, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Mori
authors.affiliation: Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Ouchi
authors.affiliation: Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan.
authors.forename: Shoko
authors.initials: S
authors.lastname: Itakura
authors.affiliation: Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan.
authors.forename: Michiko
authors.initials: M
authors.lastname: Yasuda
authors.affiliation: Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hitosugi
authors.affiliation: Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan.
authors.forename: Uno
authors.initials: U
authors.lastname: Imaizumi
authors.affiliation: Section of Dental Education, Division of Oral Biological Sciences, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Miki
authors.affiliation: Argon Medical Devices Japan, Davinchi-Ningyocho 6F, 2-13-9 Nihonbashi-ningyochou, Chuo-ku, Tokyo, 103-0013, Japan.
authors.forename: Izumi
authors.initials: I
authors.lastname: Toyoguchi
authors.affiliation: Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan.
authors.forename: Kazu-Ichi
authors.initials: KI
authors.lastname: Yoshida
authors.affiliation: Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yokoyama
mesh_terms: D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000295:instrumentation* / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D009991:Oscillometry / Q000295:instrumentation / Q000379:methods; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D012984:Software; D014160:Transducers, Pressure
keywords: Blood pressure transducer kits; Damping coefficient; Intra-arterial pressure wave; Marvelous™; Natural frequency; Three-way stopcock