Ultrasound-Guided Interscalene Catheter Complicated by Persistent Phrenic Nerve Palsy.

A 76-year-old male presented for reverse total shoulder arthroplasty (TSA) in the beach chair position. A preoperative interscalene nerve catheter was placed under direct ultrasound-guidance utilizing a posterior in-plane approach. On POD 2, the catheter was removed.