Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

87 questions · 95 findings · 18 reviews · Anaesthesia · Headline outcomes only

No studies found 5 · 5.3%GRADE not reported 2 · 2.1%Very low 28 · 29.5%Low 39 · 41.1%Moderate 21 · 22.1%High 0 · 0%

Lidocaine IV vs placebo or no treatment

Nausea · adults undergoing surgery with general anaesthesia

It is very uncertain whether intravenous (IV) lidocaine changes postoperative nausea, 'overall' (0 to 24 h, to 48 h, to 72 h) compared with placebo or no treatment (very low certainty).

1 finding from 1 review

Intravenous dexamethasone vs placebo

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · participants undergoing surgery with peripheral nerve block
3 findings from 1 review

Intravenous dexamethasone vs placebo

Incidence of serious adverse events (we used the NIH definition of adverse events. A serious event includes death, a life‐threatening event that requires hospitalization or prolonged hospitalization, disability or congenital anomaly) · participants undergoing surgery with peripheral nerve block

The review found no eligible studies for this question.

1 finding from 1 review

Buffered vs non‐buffered crystalloid intravenous fluid

Mortality (in‐hospital death and 30‐day mortality) · adults receiving intravenous fluids whilst undergoing any form of surgery

Buffered showed no clear difference in mortality (in‐hospital death and 30‐day mortality) compared with non‐buffered crystalloid intravenous fluid (low certainty).

1 finding from 1 review

Buffered vs non‐buffered crystalloid intravenous fluid

Organ system failure ‐ renal insufficiency requiring support · adults receiving intravenous fluids whilst undergoing any form of surgery

Buffered showed no clear difference in organ system failure ‐ renal insufficiency requiring support compared with non‐buffered crystalloid intravenous fluid (low certainty).

1 finding from 1 review