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Evidence found and GRADE certainty

271 questions · 287 findings · 26 reviews · Colorectal

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No studies found 22 · 7.7%GRADE not reported 7 · 2.4%Very low 83 · 28.9%Low 115 · 40.1%Moderate 49 · 17.1%High 11 · 3.8%

Summary of findings table ‐ Combined mechanical and oral antibiotic bowel preparation vs oral antibiotics

Postoperative ileus · Patients undergoing elective colorectal surgery

Summary of findings table ‐ Combined mechanical and oral antibiotic… showed no clear difference in incidence of postoperative ileus compared with oral antibiotics alone (low certainty).

1 finding from 1 review

Nitrous oxide vs carbon dioxide

Cardiopulmonary complications · people undergoing laparoscopic general abdominal or gynaecological pelvic surgery under general anaesthesia

It is very uncertain whether nitrous oxide changes cardiopulmonary complications compared with carbon dioxide (very low certainty).

1 finding from 1 review

Helium vs carbon dioxide

Pneumoperitoneum‐related serious adverse events · people undergoing laparoscopic general abdominal or gynaecological pelvic surgery under general anaesthesia

It is very uncertain whether helium changes pneumoperitoneum‐related serious adverse events compared with carbon dioxide (very low certainty).

1 finding from 1 review

Helium vs carbon dioxide

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · people undergoing laparoscopic general abdominal or gynaecological pelvic surgery under general anaesthesia

Helium showed no clear difference in pain scores (first postoperative day) Visual analogue scale, lower… compared with carbon dioxide (low certainty).

1 finding from 1 review

Nitrous oxide vs carbon dioxide

Procedure‐related general complications · people undergoing laparoscopic general abdominal or gynaecological pelvic surgery under general anaesthesia

It is very uncertain whether nitrous oxide changes procedure‐related general complications (surgical morbidity) compared with carbon dioxide (very low certainty).

1 finding from 1 review

Room air vs carbon dioxide

Patient‐reported pain intensity or pain relief (VAS, NRS or categorical scale) · people undergoing laparoscopic general abdominal or gynaecological pelvic surgery under general anaesthesia

It is very uncertain whether room air changes pain scores (first postoperative day) Visual analogue scale, lower… compared with carbon dioxide (very low certainty).

1 finding from 1 review