Limitations
anxiety, pain
There are some limitations in this study. First of all, this was a pilot trial with a small sample size, and the results must be confirmed in greater trials. Secondly, considering the patient’s comfort, dermatomal evaluation could not be performed because the blocks were performed under general anesthesia before the surgical incision. However, sedo-analgesia applied to prevent pain and anxiety in patients may limit this evaluation, even if it is performed in an awake patient. Fourthly, Since the feeling of pain is a subjective condition, the results may vary from person to person. In addition, the use of the PCA device varies individually. Moreover, the limited effect of opioids on pain, especially while coughing, may also affect the pain condition. Finally, in this two-center study, although the block was applied by anesthetists with US experience, this situation has the potential to affect the effectiveness of the operator-based block.