Fujiwara Shigeki, Mori Satoshi, Tachihara Keiichi, Yamamoto Takeshi, Yokoe Chizuko, Imaizumi Uno, Morimoto Yoshinari, Miki Yoichiro, Toyoguchi Izumi, Yoshida Kazu-Ichi, Yokoyama Takeshi
Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan.
Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
J Clin Monit Comput. 2017 Apr;31(2):371-380. doi: 10.1007/s10877-016-9854-4. Epub 2016 Mar 5.
The accurate monitoring of arterial blood pressure is important for cardiovascular management. However, the frequency characteristics of pressure transducer kits are influenced by the length of the pressure-resistant tube. To date, there have been few studies addressing the frequency characteristics of pressure transducer kits with inserted pressure-resistant extension tubes (pressure-resistant extension tube (ET) circuits). In this study, we examine ET circuits from the viewpoint of the frequency characteristics of pressure transducer kits. DT4812J transducer kits (length 150 cm; Argon Medical Devices, TX, USA) were used. Three original ET circuits were prepared, with the pressure-resistant tube of the DT4812J being extended with a 30-cm length of pressure-resistant tube (180ET circuit), a 60-cm length of pressure-resistant tube (210ET circuit), and a 90-cm length of pressure-resistant tube (240ET circuit). Each of these circuits was evaluated as part of this study. The natural frequency of the original DT4812J circuit was 45.90 Hz while the damping coefficient was 0.160. For the 180 ET circuit, the natural frequency and damping coefficient were 36.4 Hz and 0.162, respectively. For the ET210 circuit, the natural frequency and damping coefficient were 30.3 Hz and 0.175, respectively. For the ET210 circuit, the natural frequency and damping coefficient were 25.3 Hz and 0.180, respectively. As a result of extending the circuit, it was found that the natural frequency decreased drastically, while the damping coefficient increased slightly. When the extension of a pressure transducer kit is required, we should pay careful attention to the major decrease in the natural frequency, which may influence the pressure monitoring.
准确监测动脉血压对于心血管管理至关重要。然而，压力传感器套件的频率特性会受到耐压管长度的影响。迄今为止，针对带有插入式耐压延长管（耐压延长管（ET）回路）的压力传感器套件的频率特性的研究很少。在本研究中，我们从压力传感器套件的频率特性角度研究了ET回路。使用了DT4812J传感器套件（长度150厘米；美国德克萨斯州的氩气医疗设备公司）。制备了三个原始的ET回路，将DT4812J的耐压管分别延长30厘米（180ET回路）、60厘米（210ET回路）和90厘米（240ET回路）。这些回路中的每一个都作为本研究的一部分进行了评估。原始DT4812J回路的固有频率为45.90赫兹，而阻尼系数为0.160。对于180ET回路，固有频率和阻尼系数分别为36.4赫兹和0.162。对于210ET回路，固有频率和阻尼系数分别为30.3赫兹和0.175。对于240ET回路，固有频率和阻尼系数分别为25.3赫兹和0.180。作为回路延长的结果，发现固有频率急剧下降，而阻尼系数略有增加。当需要延长压力传感器套件时，我们应仔细注意固有频率的大幅下降，这可能会影响压力监测。
