Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

393 questions · 411 findings · 111 reviews

No studies found 51 · 12.4%GRADE not reported 40 · 9.7%Very low 86 · 20.9%Low 121 · 29.4%Moderate 84 · 20.4%High 29 · 7.1%

Heliox vs oxygen 30%

Proportion of children intubated · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Duration of intubation · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Proportion of children re‐presenting for medical care for ongoing croup symptoms (return to care) · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

Heliox vs oxygen 30%

Adverse events · children with croup

The review found no eligible studies for this question.

1 finding from 1 review

HFNC vs standard oxygen therapy

Treatment failure (escalation of respiratory therapy to NIV, NIPPV or invasive ventilation) Measured up to 28 days · adults in the ICU, requiring respiratory support

HFNC may leads to lower treatment failure (escalation of respiratory therapy to NIV, NIPPV… compared with standard oxygen therapy (low certainty).

1 finding from 1 review

HFNC vs standard oxygen therapy

In‐hospital mortality (up to 90 days; included studies reported in‐hospital mortality, and mortality up to 28 days and up to ICU discharge) · adults in the ICU, requiring respiratory support

HFNC showed no clear difference in in‐hospital mortality (up to 90 days; included studies reported… compared with standard oxygen therapy (moderate certainty).

1 finding from 1 review

HFNC vs standard oxygen therapy

Adverse events Respiratory infection (pneumonia) Nasal mucosa or skin trauma · adults in the ICU, requiring respiratory support

HFNC showed no clear difference in adverse events Respiratory infection (pneumonia) Nasal mucosa or… compared with standard oxygen therapy (moderate certainty).

1 finding from 1 review

Continuous positive airway pressure (CPAP) vs supplemental oxygen

Treatment failure (death or use of additional ventilatory support) · preterm infants with respiratory distress for initial respiratory support

It is very uncertain whether CPAP changes treatment failure (death or use of additional ventilatory support) compared with supplemental oxygen (very low certainty).

1 finding from 1 review