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For combined spinal-epidural anesthesia, a spinal needle protrusion length of 12 to 15 mm is recommended, with no prospective data supporting the use of an epidural needle with a separate back hole.
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The authors discuss technical aspects of combined spinal-epidural anesthesia, recommending a spinal needle protrusion length of 12-15 mm and disputing the necessity of an epidural needle with a separate back hole.
Urmey et al. (1996) conducted a letter in Outpatient Surgery. Combined spinal-epidural (CSE) needle-through-needle technique was evaluated. For combined spinal-epidural anesthesia, a spinal needle protrusion length of 12 to 15 mm is recommended, with no prospective data supporting the use of an epidural needle with a separate back hole.
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