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| Methods | RCT |
| Participants | 40 patients undergoing retroperitoneal laparoscopic surgery for adrenal tumours |
| Interventions |
Intervention: pre‐emptive epidural anaesthesia at T10‐T11 with 0.2% bupivacaine 5 to 10 mL to maintain anaesthesia level at T4 (n = 20) Control: no epidural (n = 20) General anaesthesia for all participants |
| Outcomes | Endothelin Calcitonin gene‐related peptide |
| Notes |
