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| Methods | Randomized controlled trial |
| Participants | Patients undergoing elective non‐cardiac surgery |
| Interventions | Tropisetron or placebo |
| Outcomes | Delirium, nausea, vomiting, side effects |
| Notes | Study protocol identified in search update; missing information about anaesthesia details (standardized); if eligible, data will be included in next update of the review |
