interscalene block definition
Interscalene nerve block refers to the technique of anesthetizing the roots or trunks of the brachial plexus in the neck between the anterior and middle scalene muscles. The procedure was first well described and popularized by Alon Winnie in 1970. Interscalene nerve block is typically performed to provide anesthesia or analgesia for surgery of the shoulder and upper arm.It is not as effective for surgery that involves the C8-T1 nerve roots (ulnar nerve distribution).