Evaluation of rhomboid intercostal and subserratus plane block under direct vision for postoperative analgesia in thoracic surgeries: a prospective, randomized controlled trial

Abstract

Abstract OBJECTIVES This study is designed to evaluate the efficacy of rhomboid intercostal and subserratus plane (RISS) block under the surgeon’s direct vision for providing postoperative pain relief after thoracic surgeries. METHODS Forty patients who underwent thoracotomy were prospectively recruited and randomly assigned to group R (intravenous patient-controlled analgesia + continued RISS block; n = 20) and group C (intravenous patient-controlled analgesia; n = 20). Numeric rating scale at rest and cough, at post-anaesthetic care unit, 1, 2, 6, 9, 12, 24 and 48 h, was used as the primary outcome measure. Secondary outcome measures were the amount of tramadol consumption, the number of patients required rescue analgesia, the occurrence of postoperative adverse effects, pulmonary functions and the overall satisfaction with pain management. RESULTS Numeric rating scale scores both at rest and during coughing were significantly lower in group R than in group C at all time intervals (P < 0.001 in each). Tramadol consumption at 24 and 48 h was significantly lower in the group R block than in group C (P < 0.001 for each). None of the patients in group R requires rescue analgesia. The incidence of nausea and vomiting was similar among the groups. Compared with group C, change in lung function from baseline levels was significantly less in group R (P = 0.047 and P = 0.04 for FEV1 and FVC, respectively). The satisfaction scores in group R were significantly higher than that in group C (P < 0.001). CONCLUSIONS Continuous RISS block improved postoperative outcomes of thoracic surgery in terms of reduced postoperative pain scores, sparing opioid consumption, pulmonary function and patient satisfaction.