• Br J Anaesth · Nov 1999

    Randomized Controlled Trial Clinical Trial

    Posterior epidural space depth: safety of the loss of resistance and hanging drop techniques.

    • V L Hoffmann, M P Vercauteren, J P Vreugde, G H Hans, H C Coppejans, and H A Adriaensen.
    • Department of Anaesthesiology, University Hospital Antwerp, Edegem, Belgium.
    • Br J Anaesth. 1999 Nov 1;83(5):807-9.

    AbstractWe have compared skin to epidural space distance (SED) and tip to tip distance (TTD), a measure of posterior epidural space depth (PESD), in 40 patients with a 27-gauge Whitacre needle after identification of the epidural space using the hanging drop (HD) or loss of resistance (LOR) to air technique. After the LOR technique, TTD was found to be 2 mm greater than that after the HD technique, whereas SED was the same. We conclude that identification of the epidural space can be performed successfully with both techniques, but with a diminished risk of dural damage after LOR compared with the HD technique.

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