Postoperative Analgesic Effect of Infraspinatus-teres Minor Inter-fascial Block in Patients Undergoing Shoulder Surgery

After identifying the infraspinatus and teres minor muscles on the posterior surface of the scapular neck. Under real-time ultrasound guidance, the needle is advanced into the interfascial plane between the infraspinatus and teres minor muscles using an in-plane technique, and after confirming the fascial opening with 3 to 5 mL of 0.375% ropivacaine (20 mL total dose), the remaining 0.375% ropivacaine is injected. After extubation and the patients were awake, anesthesiologists who were unaware of the study subgroups began to assess the analgesic effect of the patients' block at rest using the numeric pain rating scale (NRS) at 0.5h, 3h, 6h, 12h, 18h, 24h, and 48h postoperatively.

The tip of the needle was placed between the C5 and C6 nerve roots, and after a bloodless retraction with 0.5 to 1 ml of 0.375% ropivacaine to confirm nerve displacement, the remaining 0.375% ropivacaine was injected (total dose of 20 ml). Subsequently, the catheter was inserted over the needle and the needle was withdrawn.After extubation and the patients were awake, anesthesiologists who were unaware of the study subgroups began to assess the analgesic effect of the patients' block at rest using the numeric pain rating scale (NRS) at 0.5h, 3h, 6h, 12h, 18h, 24h, and 48h postoperatively.