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What do systematic reviews say?

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Evidence found and GRADE certainty

4,410 questions · 8,901 findings · 1,091 reviews

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No studies found 1,687 · 19%GRADE not reported 1,469 · 16.5%Very low 1,969 · 22.1%Low 2,060 · 23.1%Moderate 1,302 · 14.6%High 414 · 4.7%

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Scalp infiltration vs placebo or control

Adverse event nausea and vomiting (0 to 24 hours) · adults undergoing brain surgery

Scalp infiltration showed no clear difference in adverse event nausea and vomiting (0 to 24 hours) compared with control or placebo intervention (low certainty).

1 finding from 1 review

Scalp block vs placebo or control

Adverse event nausea and vomiting (0 to 24 hours) · adults undergoing brain surgery

It is very uncertain whether scalp block changes adverse event nausea and vomiting (0 to 24 hours) compared with control or placebo intervention (very low certainty).

1 finding from 1 review

PUL vs TURP

Retreatment

It is very uncertain whether PUL changes retreatment compared with TURP (very low certainty).

2 findings from 1 review