Svatikova 2011.

Methods	Randomised cross‐over trial
Participants	Acute ischaemic stroke or probable ischaemic stroke Participants included: 18 Diagnosis based on the WHO MONICA criteria ≥ 18 years Gender: male 11 (61%); female 7 (39%) Age: 54‐68 Inclusion criteria Ischemic stroke or probable Ischaemic stroke‐ WHO MONICA criteria Age ≥ 18 years Exclusion criteria Any medical condition that precluded the avoidance of supine position or dictated the need for a particular position Patients already on positive airway pressure therapy, mechanical ventilation or supplemental oxygen
Interventions	Intervention: positional device called Sona pillow‐ designed to prevent supine sleep Control: standard hospital pillow, participant positioned at liberty Duration: 2 consecutive nights‐ 1 night with intervention and 1 night without intervention
Outcomes	Relative change in AHI with the intervention Absolute difference in the mean SaO2 Absolute difference in the time spend in the supine position Self‐reported adherence in the 3‐month follow‐up period (phase II of the study)
Notes	Settings: inpatient neurology service, University of Michigan Duration of follow‐up: 3‐month follow‐up as the continuation for assessment of adherence Drop out: nil Funding: University of Michigan Clinical and translational science award
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomisation procedure not stated. High risk may be mitigated by the cross‐over design of the study.
Allocation concealment (selection bias)	Unclear risk	Allocation concealment procedure not stated. High risk may be mitigated by the cross‐over design of the study.
Blinding of participants and personnel (performance bias) Objective outcomes ( AHI)	High risk	Blinding not mentioned, but likely not blinded considering the nature of the intervention
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Blinding not mentioned
Incomplete outcome data (attrition bias) All outcomes	Low risk	No attrition
Selective reporting (reporting bias)	Unclear risk	Unclear as we could not access the protocol of the study
Other bias	Low risk	None identified