• Eur J Anaesthesiol · Nov 2004

    Influence of microcatheter length on flow rates of disposable infusion kits.

    • T Kasai, M Hirose, K Yaegashi, T Fujita, Y Hirai, and Y Tanaka.
    • Department of Anaesthesiology, Kyoto Prefectural University of Medicine, Kyoto, Japan. kasai@koto.kpu-m.ac.jp
    • Eur J Anaesthesiol. 2004 Nov 1; 21 (11): 858-60.

    Background And ObjectiveContinuous spinal analgesia (CSA) offers considerable pain relief, and has been used in various procedures such as for surgery and cancer pain control. In Japan, portable and disposable infusion kits are increasingly employed for continuous epidural analgesia and CSA. In CSA, the use of a microcatheter is expected to reduce the incidence of spinal headache previously encountered with larger catheters. However, the flow rate of disposable infusion kits is reduced when used in conjunction with a microcatheter.MethodsThis study aimed to investigate the influence of catheter length on the flow rate of two different devices: 20- or 91-cm 28-G microcatheters connected to balloon- or syringe-type infusion pumps were examined (50 mL, 1 mL h(-1)). There were four groups each of 10 experiments: Group A: balloon-type infuser, 91 cm catheter; Group B: balloon-type infuser, 20 cm catheter; Group C: syringe-type infuser, 91 cm catheter; Group D: syringe-type infuser, 20 cm catheter.ResultsThe mean flow rate in Group A was significantly less than that in Group B and the mean flow rate in Group C was significantly less than Group D (P < 0.05).ConclusionThese results indicated that the use of a shorter microcatheter achieves a better flow rate during CSA.

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