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A, The perineural catheter has been tunneled posteriorly beneath the hairline. The initial catheter placement site has been covered by liquid adhesive and a clear occlusive dressing. B, The anchoring device has been secured on the contralateral shoulder to avoid the anticipated surgical field. C, Following a 40 mL bolus injection of 0.5% ropivacaine, unilateral upper extremity anesthesia has been achieved in a distribution typical of the interscalene block (shaded area).
