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| Methods | Randomized controlled trial |
| Participants | Patients undergoing elective middle ear surgery, ASA I and II |
| Interventions | Ondansetron 0.1 mg/kg IV or dexamethasone 0.15 mg/kg IV or ondansetron 0.1 mg/ kg IV with dexamethasone 0.15 mg/kg IV 10 minutes before induction of anaesthesia |
| Outcomes | PONV, headache, dizziness, erythema at injection site, perineal itching |
| Notes | Missing information about range of age; no contact details available |
