Radius Fractures Clinical Trial
Official title:
A Randomized Comparison Between 1 Plane - 1 Injection (Cluster Approach) and 2 Plane - 2 Injection Ultrasound-guided Supraclavicular Brachial Plexus Block (US-SCBPB) in Upper Extremity Surgery
Ultrasound-guided supraclavicular brachial plexus block (US-SCBPB) has been a generalized
regional anesthesia in upper extremity surgery. It is performed just above the clavicle, in
which the neural cluster formed by the trunks or divisions of the brachial plexus is
situated superolateral to the subclavian artery (SA).
In many approaches, corner pocket approach [deposit local anesthetic (LA) at the
intersection of the SA, neural cluster, and the first rib] and cluster approach (direct
deposit LA into the neural cluster after penetration of the sheath of brachial plexus) has
been well known methods. And single or multiple injection techniques has been used with the
above approaches.
In clinical practices, the investigators observed that the neural cluster was shown differently every person on the ultrasound image. Some neural cluster is shown as a typical round cluster of grapes lateral to the SA, in which, any approaches of US-SCBPB can be possible and good success rates are anticipated. But in many cases, neural cluster was shown in part lateral or superolateral to the SA like slightly-hated SA on the ultrasound image, and it passes posterior to the SA when the probe follows the path of the neural cluster along the SA. In that case, corner pocket approach is hard to apply due to the position of the neural cluster far away from the first rib, cluster approach increases chance of lopsided spreading of the LA, and multiple injection is also hard to apply due to narrow-shaped neural cluster. Therefore, we hypothesized that double injection in different plane (we call this new approach as a 2 plane-2 injection approach) would achieve an effect of a "tridimensionally administered LA", which is presented like shortening the onset time or increasing rate of all four nerves block compared with the existing cluster approach (the investigators call this as an 1 plane- 1 injection approach in this study). ;
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator)
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