[Randomized prospective study of three different techniques for ultrasound-guided axillary brachial plexus block].

Introduction: Randomized prospective study comparing two perivascular techniques with the perineural technique for ultrasound-guided axillary brachial plexus block (US-ABPB). The primary objective was to verify if these perivascular techniques are noninferior to the perineural technique.

Method: 240 patients were randomized to receive the techniques: below the artery (BA), around the artery (AA) or perineural (PN).