Prolonged dysphonia as a complication of interscalene block.

The interscalene block (ISB) of the brachial plexus is a common technique for anaesthesia and the treatment of postoperative pain in shoulder surgery. Despite the well-known advantages of this technique, it is not without risks that need to be identified and taken into account. The most frequent complications associated with it are of a neurological nature and most are transient. It has been shown that the use of nerve stimulation does not guarantee a safe block. Ultrasound guidance now makes it possible to visualise potentially dangerous structures, thus allowing us to reduce the risk of associated complications. We present the case of a patient with transient dysphonia secondary to recurrent laryngeal nerve palsy. We also discuss briefly the most common complications associated with the technique.