Adib‐Hajbaghery 2013.
| Methods | Parallel‐group, blinded randomized trial, conducted in Iran. Study dates not reported. | |
| Participants | 88 people aged 15 ‐ 70 years undergoing appendectomy under general anaesthesia. Exclusion: past history of nausea and vomiting in the past 24 h, prior use of acupressure or acupuncture, history of gastrointestinal or ear disorders, neurological impairment, fever, unanticipated perioperative complications. | |
| Interventions | Acupressure wristband placed at P6 points on both wrists, applied in the recovery room when participant was awake and removed after 7 hours following surgery (n = 44). Sham group was acupressure wristbands without bead on P6 points applied to both wrists, applied in the recovery room when participant was awake and removed after 7 hours following surgery (n = 44). |
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| Outcomes | Nausea (0 ‐ 7 h), vomiting (0 ‐ 7 h), risk of rescue antiemetic (metoclopramide 10 mg) | |
| Notes | No power calculation done. Funding sources not declared. Authors declare no conflict of interest in the study. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Low risk | Participants were "randomly allocated to two groups using a dice (odd numbers to the acupressure group and even numbers to the control group." |
| Allocation concealment (selection bias) | Unclear risk | Insuffient information. |
| Blinding of patients (performance bias) All outcomes | Low risk | Participants blinded to intervention. |
| Blinding of healthcare providers (performance bias) All outcomes | Low risk | "Staff blinded to grouping". |
| Blinding of outcome assessor (detection bias) All outcomes | High risk | Researcher and nurse likely to know allocation group. |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | Insufficient information. |
| Selective reporting (reporting bias) | High risk | Participant discomfort with wristbands monitored by researchers every 2 hours but not reported. |
| Other bias | Low risk | Baseline characteristics for age, body mass index, duration of anaesthesia and incision length were comparable. |