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Pencil-point Needle Bevel Direction Influences ED50 of Isobaric Ropivacaine With Fentanyl in Spinal Anesthesia for Cesarean Delivery: A Prospective, Double-blind Sequential Allocation Study

Stroumpoulis, K.; Stamatakis, E.; Koutroumanis, P.; Loukeri, A.; Valsamidis, D.

doi: 10.1097/01.aoa.0000482644.08506.17
Anesthesia Analgesia: Regional Anesthesia

(Int J Obstet Anesth. 2015;24:225–229)

The authors of this study reported that their clinical experiences suggested that a cephalad orientation of the bevel of a Whitacre spinal needle decreased the amount of local anesthetic required for effective spinal anesthesia during cesarean delivery. To provide evidence supporting their anecdotal experience, they conducted a prospective, double-blind, sequential allocation study, in which they evaluated if the mean effective dose (ED50) of intrathecal isobaric 0.75% ropivacaine with fentanyl differed when the bevel direction of a 26-G Whitacre needle was changed.

Anesthesiology Department, “Alexandra” General Hospital of Athens, Athens, Greece

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