Background: Pain control in the morbidly obese has presented as an anesthetic challenge. The aim of this study is to assess the analgesic efficacy of ultrasound guided bilateral erector spinae block compared to bilateral subcostal transversus abdominis plane block.
Methods: A prospective randomized, double-blinded controlled study was conducted at Kasr Alainy Hospital on 66 patients scheduled for laparoscopic sleeve gastrectomy. Patients were randomly allocated into three groups and received general anesthesia: bilateral erector spinae block at the level of T9 or bilateral subcostal transversus abdominis block or opioid analgesia (control group). The primary outcome was pain assessment by Visual Analogue Scale.
Results: Visual Analogue Scale was lower in the erector spinae and transversus abdominis groups compared with the control group throughout the first 12 postoperative hours (P≤0.001). Visual Analogue Scale was lower in the erector spinae group in relation to control group at 18 postoperative hours (P=0.034). Visual Analogue Scale in the erector spinae group was significantly lower compared to transversus abdominis at the 12 postoperative hours. Twenty-four-hour postoperative pethidine consumption was higher in the control group (median 150, IQR 100-200) compared to both erector spinae (median 0, IQR 0-50) and transversus abdominis (median 50, IQR 0-100) groups (P<0.001). Erector spinae group showed less pethidine consumption than transversus abdominis group.
Conclusions: Ultrasound-guided single-shot T9 erector spinae plane block lowers postoperative pain scores, and reduces intraoperative and postoperative opioid consumption compared with both the subcostal approach transversus abdominis plane block and the control group in obese patients that had undergone sleeve gastrectomy.