Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

637 questions · 674 findings · 79 reviews · Gut

No studies found 116 · 17.2%GRADE not reported 14 · 2.1%Very low 133 · 19.7%Low 225 · 33.4%Moderate 145 · 21.5%High 41 · 6.1%

Three infusions of natalizumab (300 mg) and two infusions of infliximab (5 mg/kg) vs placebo and two infusions of infliximab

Withdrawals due to adverse outcomes · Participants with active Crohn's disease despite current treatment with infliximab

Three infusions of natalizumab (300 mg) and two infusions of… showed no clear difference in withdrawal due to adverse events up to week 10 compared with placebo and two infusions of infliximab (low certainty).

1 finding from 1 review

Three infusions of natalizumab (300 mg) and two infusions of infliximab (5 mg/kg) vs placebo and two infusions of infliximab

Serious adverse events up to week 10 · Participants with active Crohn's disease despite current treatment with infliximab

Three infusions of natalizumab (300 mg) and two infusions of… showed no clear difference in serious adverse events up to week 10 compared with placebo and two infusions of infliximab (low certainty).

1 finding from 1 review

Two infusions of natalizumab (300 mg or 3 mg/kg) vs placebo

Failure to induce remission at 6 weeks · Patients with active Crohn's disease

Two infusions of natalizumab (300 mg or 3 mg/kg) leads to lower failure to induce remission at 6 weeks compared with placebo (high certainty).

2 findings from 1 review

Proton pump inhibitors (PPI) vs placebo or no prophylaxis

Clinically important upper GI bleeding · people admitted to intensive care units

Proton pump inhibitors showed no clear difference in clinically important upper GI bleeding compared with placebo or no prophylaxis (low certainty).

1 finding from 1 review