Wrong-site nerve blocks: a systematic literature review to guide principles for prevention.

Wrong-site procedures are considered never events, yet they continue to occur. This review describes the incidence, impacts, and contributing factors of wrong-site nerve blocks. The authors recommend verifying the procedure and patient with multiple sources of information, using visible site markings, and employing time outs immediately prior to anesthetic use. A WebM&M commentary discussed an incident involving a wrong-site nerve block.