Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

119 questions · 119 findings · 24 reviews · Anaesthesia · Headline outcomes only

No studies found 16 · 13.4%GRADE not reported 6 · 5%Very low 23 · 19.3%Low 42 · 35.3%Moderate 29 · 24.4%High 3 · 2.5%

Intervention not reported

Surgical site infection within 30 days in trials with low risk of bias (14 days to 30 days) · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

The intervention showed no clear difference in surgical site infection within 30 days in trials with low risk of… (low certainty).

1 finding from 1 review

Intervention not reported

Surgical site infection within 30 days, irrespective of risk of bias (14 days to 30 days) · surgical patients with need for abdominal, caesarean section, orthopaedic or breast surgery

The intervention showed no clear difference in surgical site infection within 30 days, irrespective of risk of bias… (low certainty).

1 finding from 1 review

Supplemental IV crystalloid vs control IV crystalloid volume

Risk of unintended postoperative admission to hospital, reported dichotomously as admission to an inpatient unit of a participant after an intended ambulatory surgical procedure · participants aged 6 months or older undergoing surgical procedures under general anaesthesia

Supplemental IV crystalloid showed no clear difference in risk of unintended postoperative admission to hospital, reported… compared with control IV crystalloid volume (low certainty).

1 finding from 1 review

Topical anaesthesia plus intracameral lidocaine vs topical anaesthesia alone

Intraoperative adverse surgical events attributable to choice of anaesthesia · adults undergoing phacoemulsification cataract surgery

Topical anaesthesia plus intracameral lidocaine showed no clear difference in intraoperative adverse surgical events attributable to choice of… compared with topical anaesthesia alone (low certainty).

1 finding from 1 review

Thoracic epidural anaesthesia vs conventional pain control

Persistent pain 3 to 18 months after thoracotomy (We defined persistent postsurgical pain as new pain that did not exist before the operation, measured using differences in scores based on validated pain scales; patient interview between 3 to 18 m... · Patients undergoing thoracotomy

Thoracic epidural anaesthesia probably leads to lower persistent pain 3 to 18 months after thoracotomy (We defined… compared with conventional pain control (moderate certainty).

1 finding from 1 review

Regional anaesthesia vs conventional pain control

Persistent pain 3 to 12 months after breast cancer surgery (We defined persistent postsurgical pain as new pain that did not exist before the operation, measured using differences in scores based on validated pain scales; patient interview between... · women with breast cancer undergoing elective surgery

Regional anaesthesia may leads to lower persistent pain 3 to 12 months after breast cancer surgery (We… compared with conventional pain control (low certainty).

1 finding from 1 review

Intervention not reported

Persistent pain 3 to 8 months after caesarean section (We defined persistent postsurgical pain as new pain that did not exist before the operation, measured using differences in scores based on validated pain scales; patient interview between 3 to... · women after caesarean section

The intervention probably leads to lower persistent pain 3 to 8 months after caesarean section (We defined… (moderate certainty).

1 finding from 1 review

Intervention not reported

Persistent pain 3 to 55 months after iliac crest bone graft harvesting (We defined persistent postsurgical pain as new pain that did not exist before the operation, measured using differences in scores based on validated pain scales; patient inter... · people after iliac crest bone graft harvesting

The intervention showed no clear difference in persistent pain 3 to 55 months after iliac crest bone graft… (low certainty).

1 finding from 1 review

Intervention not reported

Persistent pain 3 to 6 months after breast cancer surgery (We defined persistent postsurgical pain as new pain that did not exist before the operation, measured using differences in scores based on validated pain scales; patient interview between ... · women with breast cancer undergoing elective surgery

The intervention probably leads to lower persistent pain 3 to 6 months after breast cancer surgery (We… (moderate certainty).

1 finding from 1 review

Intervention not reported

Perioperative bleeding requiring non‐surgical intervention · patients with paediatric tonsillectomy

The intervention showed no clear difference in perioperative bleeding requiring non‐surgical intervention (moderate certainty).

1 finding from 1 review

Infraclavicular block vs all other brachial plexus blocks

Adequate surgical anaesthesia ‐ At 30 minutes post‐block assessment interval · patients with regional anaesthesia of the lower arm

infraclavicular block showed no clear difference in adequate surgical anaesthesia ‐ At 30 minutes post‐block assessment… compared with all other brachial plexus blocks (high certainty).

1 finding from 1 review

Infraclavicular block vs all other brachial plexus blocks

Supplementation required for surgical anaesthesia · patients with regional anaesthesia of the lower arm

infraclavicular block showed no clear difference in supplementation required to achieve adequate surgical anaesthesia compared with all other brachial plexus blocks (high certainty).

1 finding from 1 review

Intervention not reported

Postoperative delirium (POD) within 7 days (As assessed by any method such as the Mini‐Mental State Examination (MMSE) and Confusion Assessment Method (CAM) in the first week after operation) · adults aged 18 years or over undergoing general anaesthesia for non‐cardiac or non‐neurosurgical elective operations

The intervention probably leads to lower postoperative delirium (POD) within 7 days (As assessed by any… (moderate certainty).

1 finding from 1 review

Intervention not reported

Postoperative cognitive dysfunction (POCD) (As determined by any method of assessing POCD including a battery of neuropsychological tests according to the criteria described by the International Study of Postoperative Cognitive Dysfunction (ISPOCD)) · adults aged 18 years or over undergoing general anaesthesia for non‐cardiac or non‐neurosurgical elective operations

The intervention showed no clear difference in postoperative cognitive dysfunction (POCD) (As determined by any… (moderate certainty).

1 finding from 1 review