nerve block human 7 Humans 6 Nerve Block 6 postoperative pain 6 Pain, Postoperative 4 analgesia 4 controlled study 4 Analgesics, Opioid 3 Ultrasonography, Interventional 3 interventional ultrasonography 3 narcotic analgesic agent 3 procedures 3 randomized controlled trial 3 Adult 2 Analgesia 2 Anesthetics, Local 2 Pain Management 2 Ropivacaine 2 adult 2 adverse event 2 lidocaine 2 local anesthesia 2 local anesthetic agent 2 regional anesthesia 2 ropivacaine 2 Ambulatory 1 Anesthesia 1 Anesthesia, Conduction 1 Animals 1