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Background and Aims There is a constant quest for a regional anesthetic technique that would provide anaesthesia adequately for shoulder surgeries but lacks the complications of an interscalene block, such as phrenic nerve palsy. Phrenic nerve–sparing alternatives for conventional interscalene blocks similar to the ultrasound–guided superior trunk block, and suprascapular nerve block alone or with axillary nerve block have been recently described.[6–9] The aforementioned ultrasound–guided blocks are performed for intra/postoperative analgesia as supplements to general anesthesia (GA). Shoulder surgeries performed only with these blocks without GA have not been reported
Methods RA targets for shoulder surgeries were analysed considering their cutaneous, muscular, bony, and capsular components.[6,13]
Results By using ultrasonography, we precisely located the roots, trunks, and divisions of the brachial plexus. The superior trunk (C5 and C6) and the middle trunk (C7) are the sites where the nerves supplying the shoulder are densely packed and relatively distant from the phrenic nerve. They are the ideal targets for the block to be effective and safe avoiding unwanted complications. An additional blockade of the superficial cervical plexus was required to block the cutaneous nerve supply to the shoulder, the supraclavicular nerves (C3 and C4 components).
Conclusions SMT–BPB is a refined technique of interscalene block under ultrasound guidance that precisely targets only the Superior and Middle Trunk, with a lower volume and slower injection that prevents phrenic nerve palsy. Thus, RA can be used to the advantage of high–risk patients, in whom conventional interscalene is avoided for the risk of phrenic nerve palsy.
Attachment Ethical Committee SMTBPB.pdf
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