Pectoral nerve versus erector spinae block for breast surgeries: A randomised controlled trial

BACKGROUND AND AIMS: Patients undergoing breast cancer surgeries face significant post-operative pain. We aimed to compare pectoral nerve (PECS) block with erector spinae (ESP) block in these patients in terms of analgesic efficacy and adverse effects. METHODS: Sixty four American Society of Anesthesiologists' status I and II female patients between age 18 to 60 years scheduled for unilateral modified radical mastectomy (MRM) under general anaesthesia, were enrolled in this prospective randomised study. Patients in group I received ultrasound guided (USG) ESP block (20 cc 0.2% ropivacaine) while group II received USG guided PECS II block (25 cc 0.2% ropivacaine). General anaesthesia was administered in a standardised manner to both the groups. The various parameters observed included sensory blockade, duration of analgesia and any adverse effects. The primary outcome was the total morphine consumption in 24 hours. RESULTS: The total morphine consumption in 24 hours was less in group II (4.40 ± 0.94 mg), compared to group I (6.59 ± 1.35 mg; P = 0.000). The mean duration of analgesia in patients of group II was 7.26 ± 0.69 hours while that in the group I was 5.87 ± 1. 47 hours (P value = 0.001). 26 patients in group II (PECS) had blockade of T2 as compared to only 10 patients in group I. (P value = 0.00). There was no incidence of adverse effects in either group. CONCLUSION: PECS II block is a more effective block when compared to ESP block in patients of MRM in terms of postoperative analgesia and opioid consumption.