Speed of onset of `corner pocket supraclavicular' and infraclavicular ultrasound guided brachial plexus block: a randomised observer-blinded comparison

Authors: Fredrickson, M. J.¹; Patel, A.²; Young, S.²; Chinchanwala, S.³

Source: Anaesthesia, Volume 64, Number 7, July 2009 , pp. 738-744(7)

Buy & download fulltext article:

Price: $48.00 plus tax (Refund Policy)

Abstract:

Summary

This prospective, randomised, observer blinded study compared the onset time of brachial plexus block using 2% lidocaine 25-30 ml with adrenaline 5 μg.ml⁻¹ into the `corner pocket' inferolateral/lateral to the subclavian artery (supraclavicular, n = 30) or to a triple point injection around the axillary artery (infraclavicular, n = 30). Mean (SD) onset time for complete pinprick sensory blockade assessed by a blinded observer in all four distal nerves was similar in both groups: supraclavicular = 22 (9.4) min, infraclavicular = 21 (7.1) min, p = 0.59. Complete sensory blockade in all four nerve territories at 30 min was achieved in 57% in group supraclavicular and 70% in group infraclavicular (p = 0.28). Painless surgery without the requirement for block supplementation was higher in group infraclavicular (28/30, 93%) compared with group supraclavicular (19/30, 67%; p = 0.01). Of the 11 failures in group supraclavicular, nine were due to incomplete ulnar nerve territory anaesthesia. These results do not support the concept of rapid onset successful supraclavicular block via a simple ultrasound-guided local anaesthetic injection inferolateral to the subclavian artery.

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-2044.2009.05918.x

Affiliations: 1: Consultant Anaesthetist, Auckland City Hospital, University of Auckland, Auckland 2: Orthopaedic Surgical Registrar 3: Consultant Orthopaedic Surgeon, North Shore Hospital, Auckland, New Zealand

Publication date: 2009-07-01