Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

42 questions · 42 findings · 30 reviews · Anaesthesia

No studies found 1 · 2.4%GRADE not reported 2 · 4.8%Very low 12 · 28.6%Low 20 · 47.6%Moderate 5 · 11.9%High 2 · 4.8%

Beta‐blockers vs control—non‐cardiac surgery

All‐cause mortality (30 days)—non‐cardiac surgery · patients with conditions requiring non‐cardiac surgery

Beta‐blocker showed no clear difference in all‐cause mortality (30 days)—non‐cardiac surgery compared with control—non‐cardiac surgery (low certainty).

1 finding from 1 review

rHuEPO with iron vs control treatment with or without iron

Mortality (within 30 days after surgery) · adult participants, irrespective of gender and type of non‐cardiac surgery, with mild or severe preoperative anaemia

rHuEPO with iron showed no clear difference in mortality (within 30 days after surgery) compared with control treatment with or without iron (moderate certainty).

1 finding from 1 review

Beta‐blockers vs control—cardiac surgery

All‐cause mortality (30 days)—cardiac surgery · patients with coronary heart disease and/or valvular heart disease

Beta‐blocker showed no clear difference in all‐cause mortality (30 days)—cardiac surgery compared with control—cardiac surgery (moderate certainty).

1 finding from 1 review

Alpha2‐adrenergic agonist vs control

All‐cause mortality (within 30‐days after surgery: any reported death) · adults undergoing cardiac surgery

Alpha‐2 adrenergic agonists showed no clear difference in all‐cause mortality (within 30‐days after surgery: any reported death) compared with control (moderate certainty).

1 finding from 1 review

Low‐dose opioid based general anaesthesia vs high‐dose opioid based general anaesthesia

Mortality ‐ Death at any time after surgery · adult cardiac surgical patients

Low‐dose opioid‐based GA showed no clear difference in mortality ‐ Death at any time after surgery compared with high‐dose opioid‐based GA (low certainty).

1 finding from 1 review

Low tidal volume vs high tidal volume

All‐cause mortality · adults (aged > 16 years) without acute lung injury needing mechanical positive pressure ventilation during their surgery and undergoing…

Low tidal volume showed no clear difference in mortality compared with high tidal volume (low certainty).

1 finding from 1 review

Intervention not reported

Mortality rate Risk ratio · cerebral protection during brain surgery

The intervention showed no clear difference in mortality rate Risk ratio (moderate certainty).

1 finding from 1 review

Continuation vs discontinuation of antiplatelet therapy

Mortality within the longest · adults undergoing non‐cardiac surgery

Continuation showed no clear difference in all‐cause mortality (at longest compared with discontinuation of antiplatelet therapy (low certainty).

1 finding from 1 review

Pulmonary artery perfusion with blood vs no perfusion during cardiopulmonary bypass

Mortality within the longest · adult surgical patients with the need for cardiopulmonary bypass‐dependent heart surgery

It is very uncertain whether pulmonary artery perfusion with blood changes all‐cause mortality within longest compared with no perfusion during cardiopulmonary bypass (very low certainty).

1 finding from 1 review

Perioperative restrictive fluid therapy vs goal‐directed fluid therapy

Mortality within the longest · adults receiving intravenous fluids while undergoing major non‐cardiac surgery

It is very uncertain whether perioperative restrictive fluid therapy changes all‐cause mortality (during longest compared with goal‐directed fluid therapy (very low certainty).

1 finding from 1 review

Epidural analgesia vs intravenous patient‐controlled analgesia

All‐cause mortality rate at 30 days · adults having abdominal surgery

Epidural analgesia showed no clear difference in all‐cause mortality rate at 30 days compared with intravenous patient‐controlled analgesia (low certainty).

1 finding from 1 review