Superior Trunk Block: A Phrenic-sparing Alternative to the Interscalene Block

Hemi-diaphragmatic paralysis from Phrenic Nerve Block is a frequent accompaniment to Interscalene Brachial Plexus Block that may be detrimental to those with compromised respiratory function.

This randomized trial compared the more selective targeting of the nerves using the more novel Superior Trunk Block employing ultrasound.

Conclusions: “Compared with the interscalene block, the superior trunk block provides noninferior surgical anesthesia while preserving diaphragmatic function. The superior trunk block may therefore be considered an alternative to traditional interscalene block for shoulder surgery.”


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