• Anaesthesia · Sep 1990

    Comparative Study

    Resistance to fluid flow through two spinal needles.

    • P J Toomey.
    • Department of Anaesthesia, Leeds General Infirmary.
    • Anaesthesia. 1990 Sep 1;45(9):751-3.

    AbstractA new needle, 120 mm long and 26 gauge in diameter, has been introduced for subarachnoid anaesthesia. The resistance to flow through the needle was measured using a pressure monitor infusion pump and compared with the resistance to flow through a 90-mm 26-gauge needle; there was a threefold increase in resistance in the 120-mm needle compared to the 90-mm needle, which could not be explained by the difference in length alone and must reflect a decrease in the internal diameter of the long needle. This results in difficulty in identifying the subarachnoid space by backflow of cerebrospinal fluid.

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