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Despite frequent incidence of hypotension, no cases of stroke were observed in this audit of 4,169 shoulder surgeries performed in the beach-chair position. Notably though, 97% of the cases were performed under brachial plexus block with intravenous sedation rather than a general or relaxant technique.
The authors estimate the upper limit incidence of stroke in the sitting position under regional anaesthesia as 1 in 1,429 (0.07%).