Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,345 questions · 4,525 findings · 483 reviews

No studies found 1,024 · 22.6%GRADE not reported 388 · 8.6%Very low 1,172 · 25.9%Low 1,227 · 27.1%Moderate 576 · 12.7%High 138 · 3%

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

Intervention not reported

Postoperative nausea (24 hours) · adult participants undergoing knee surgery (arthroscopic knee surgery or total knee replacement)

The intervention showed no clear difference in postoperative nausea (24 hours) (low certainty).

1 finding from 1 review