Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

870 questions · 912 findings · 85 reviews · Airways

No studies found 65 · 7.1%GRADE not reported 34 · 3.7%Very low 115 · 12.6%Low 273 · 29.9%Moderate 330 · 36.2%High 95 · 10.4%

Group 2 Pulmonary hypertension due to left‐heart disease ‐ PDE5i vs placebo

Improvement in WHO functional class · people with pulmonary hypertension due to left‐heart disease

Group 2 Pulmonary hypertension due to left‐heart disease ‐ PDE5i probably leads to lower improvement in WHO functional class compared with placebo (moderate certainty).

1 finding from 1 review

Supervised maintenance programme following pulmonary rehabilitation vs usual care

Hospital admissions · patients with chronic obstructive pulmonary disease

Supervised maintenance programme following pulmonary rehabilitation showed no clear difference in hospital admission (all‐cause): number of people admitted to hospital compared with usual care (low certainty).

2 findings from 1 review

Supervised maintenance programme following pulmonary rehabilitation vs usual care

Exacerbations (number of people experiencing ≥ 1 exacerbations) · patients with chronic obstructive pulmonary disease

Supervised maintenance programme following pulmonary rehabilitation showed no clear difference in exacerbation: number of people experiencing one or more exacerbation compared with usual care (low certainty).

1 finding from 1 review

Supervised maintenance programme following pulmonary rehabilitation vs usual care

All‐cause mortality · patients with chronic obstructive pulmonary disease

Supervised maintenance programme following pulmonary rehabilitation showed no clear difference in mortality compared with usual care (moderate certainty).

1 finding from 1 review