Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

407 questions · 412 findings · 45 reviews · Headline outcomes only

No studies found 137 · 33.3%GRADE not reported 8 · 1.9%Very low 129 · 31.3%Low 88 · 21.4%Moderate 47 · 11.4%High 3 · 0.7%

Tranexamic acid vs placebo (saline solution or sterile water)

Overall rate of surgical complications · adults and children with chronic rhinosinusitis with or without nasal polyps

Tranexamic acid showed no clear difference in surgical complications compared with placebo (saline solution or sterile water) (moderate certainty).

1 finding from 1 review

Tranexamic acid vs placebo (saline solution or sterile water)

Postoperative bleeding (place of packing or revision surgery within 14 days of surgery) · adults and children with chronic rhinosinusitis with or without nasal polyps

Tranexamic acid showed no clear difference in postoperative bleeding (place of packing or revision surgery within… compared with placebo (saline solution or sterile water) (low certainty).

1 finding from 1 review

RBD‐specific polyclonal F(ab') 2 fragments of equine antibodies (EpAbs) vs saline placebo

Clinical improvement: participants discharged from hospital ‐ not reported · individuals with moderate or severe COVID‐19

RBD‐specific polyclonal F(ab') 2 fragments of equine antibodies… showed no clear difference in improvement of clinical status (number of participants discharged… compared with saline placebo (low certainty).

1 finding from 1 review

RBD‐specific polyclonal F(ab') 2 fragments of equine antibodies (EpAbs) vs saline placebo

Adverse events: all grades · individuals with moderate or severe COVID‐19

RBD‐specific polyclonal F(ab') 2 fragments of equine antibodies… showed no clear difference in adverse events of any grade (by day 28) compared with saline placebo (low certainty).

1 finding from 1 review

RBD‐specific polyclonal F(ab') 2 fragments of equine antibodies (EpAbs) vs saline placebo

Serious adverse events (by day 28) · individuals with moderate or severe COVID‐19

RBD‐specific polyclonal F(ab') 2 fragments of equine antibodies… showed no clear difference in serious adverse events (by day 28) compared with saline placebo (low certainty).

1 finding from 1 review

Hyperimmune immunoglobulin from human plasma vs saline placebo

Worsening of clinical status at day 28 (data only available for clinical status worsened on day 7) · individuals with moderate or severe COVID‐19

It is very uncertain whether hyperimmune immunoglobulin from human plasma changes worsening of clinical status at day 28 (data only available for… compared with saline placebo (very low certainty).

1 finding from 1 review