Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,532 questions · 2,642 findings · 483 reviews · Headline outcomes only

No studies found 534 · 20.2%GRADE not reported 82 · 3.1%Very low 641 · 24.3%Low 807 · 30.5%Moderate 472 · 17.9%High 106 · 4%

Group 1 Pulmonary arterial hypertension ‐ PDE5i vs placebo, on combination therapy

Improvement in WHO functional class · pulmonary arterial hypertension

Group 1 Pulmonary arterial hypertension ‐ PDE5i showed no clear difference in improvement in WHO functional class compared with placebo, on combination therapy (moderate certainty).

1 finding from 1 review