• Anaesthesia · Sep 1991

    Observations on deliberate dural puncture with a Tuohy needle: depth measurements.

    • T E Hollway and R J Telford.
    • Department of Anaesthetics, Atkinson Morley's Hospital, London.
    • Anaesthesia. 1991 Sep 1;46(9):722-4.

    AbstractObservations were made during the use of a Tuohy needle to perform deliberate dural puncture for the insertion of lumbar drains to improve operating conditions for intracranial aneurysm surgery. The most striking finding was the distance from identification of the epidural space to penetration of the dura. We postulate that this was because of tenting of the dura by the blunt Tuohy needle. This was facilitated by the absence of a negative epidural space pressure because an open system was used, which allowed time for pressure equilibration. This minimised the reactive forces across the dura. Aspiration and rotation of the Tuohy needle revealed dural puncture in some cases.

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