The limitations
chronic pain, postoperative pain
ADVERSE EFFECTS, CHRONIC PAIN, COMPLICATIONS
There were limitations in our trial, including a relatively small sample size to prove the occurrence of adverse effects of the block and a limited follow-up period (only 24 h). the sample size calculation was based on the previous study conducted on thoracotomies, in which many other factors are associated with postoperative pain. We used a volume of 20 ml 0.25% bupivacaine. More studies may be performed with different volumes and concentrations. Also, no control group utilized systemic analgesia or one of the regional gold-standard approaches in shoulder arthroscopy. More extensive randomized trials are needed to determine the dexmedetomidine effect on chronic pain and other related complications.