It is very uncertain whether neuraxial block changes myocardial infarction compared with general anaesthesia (very low certainty).
It is very uncertain whether neuraxial block changes cerebrovascular accident compared with general anaesthesia (very low certainty).
It is very uncertain whether neuraxial block changes acute confusional state compared with general anaesthesia (very low certainty).
It is very uncertain whether neuraxial block changes deep vein thrombosis compared with general anaesthesia (very low certainty).
It is very uncertain whether neuraxial block changes return of patient to their own home compared with general anaesthesia (very low certainty).
Epidural local anaesthetic showed no clear difference in vomiting during first 24 hours compared with opioid‐based regimen (low certainty).
Epidural local anaesthetic showed no clear difference in anastomotic leak compared with opioid‐based regimen (low certainty).
Propofol probably leads to lower failure of deliberate hypotension (%) compared with inhalation anaesthetics (moderate certainty).
Induction and maintenance: sevoflurane + nitrous oxide (N2O) may leads to higher postoperative nausea and vomiting compared with propofol + N2O (low certainty).
It is very uncertain whether induction and maintenance: sevoflurane + nitrous oxide (N2O) changes postoperative behavioural disturbances Different scales compared with propofol + N2O (very low certainty).
It is very uncertain whether induction and maintenance: sevoflurane + nitrous oxide (N2O) changes intraoperative and postoperative respiratory and cardiovascular… compared with propofol + N2O (very low certainty).
Maintenance anaesthesia: inhalational may leads to higher nausea and vomiting ‐ subgroup analysis: thiopentone or halothane +… compared with intravenous (low certainty).