Evaluation of efficacy of erector spinae plane block performed with two different bupivacaine concentrations on postoperative analgesia of adult female patients after mastectomy surgery

In the current study, ultrasound-guided ESP block performed using two concentrations of bupivacaine (0.25% and 0.375%) provided effective analgesia after radical mastectomy surgery. However, the ESP block at the higher concentration of bupivacaine reduced postoperative tramadol consumption more significantly than the lower concentration of bupivacaine. In addition, the NRS scores of group I were significantly lower than group II. The intraoperative fentanyl requirements of the patients in the two groups were similar.