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What do systematic reviews say?

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Evidence found and GRADE certainty

304 questions · 309 findings · 37 reviews · Headline outcomes only

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No studies found 80 · 25.9%GRADE not reported 8 · 2.6%Very low 88 · 28.5%Low 75 · 24.3%Moderate 54 · 17.5%High 4 · 1.3%

Drain use vs No drain

All‐cause mortality · people undergoing elective pancreatic resections

Drain use showed no clear difference in mortality compared with no drain use following pancreatic surgery (low certainty).

2 findings from 1 review

Drain use vs No drain

Intra‐abdominal infection · people undergoing elective pancreatic resections

It is very uncertain whether drain use changes intra‐abdominal infection compared with no drain use following pancreatic surgery (very low certainty).

1 finding from 1 review

Drain use vs No drain

Wound infection · people undergoing elective pancreatic resections

Drain use showed no clear difference in wound infection compared with no drain use following pancreatic surgery (low certainty).

1 finding from 1 review

Drain use vs No drain

Morbidity · people undergoing elective pancreatic resections

Drain use showed no clear difference in morbidity compared with no drain use following pancreatic surgery (moderate certainty).

1 finding from 1 review

Drain use vs No drain

Length of hospital stay · people undergoing elective pancreatic resections

Drain use showed no clear difference in length of hospital stay compared with no drain use following pancreatic surgery (low certainty).

1 finding from 1 review

Active drain vs passive drain

Intra‐abdominal infection · people undergoing elective pancreatic resections

It is very uncertain whether active drain changes intra‐abdominal infection compared with passive drain following pancreatic surgery (very low certainty).

1 finding from 1 review

Active drain vs passive drain

Length of hospital stay · people undergoing elective pancreatic resections

It is very uncertain whether active drain changes length of hospital stay compared with passive drain following pancreatic surgery (very low certainty).

1 finding from 1 review

Active drain vs passive drain

All‐cause mortality · people undergoing elective pancreatic resections

It is very uncertain whether active drain changes mortality compared with passive drain following pancreatic surgery (very low certainty).

2 findings from 1 review

Routine abdominal drain vs No drain

Serious adverse events (proportion of patients) · patients with laparoscopic cholecystectomy.

It is very uncertain whether routine abdominal drain changes serious adverse events (proportion of patients) compared with 'no drain' (very low certainty).

1 finding from 1 review

Routine abdominal drain vs No drain

Serious adverse events (number of events) · patients with laparoscopic cholecystectomy.

It is very uncertain whether routine abdominal drain changes serious adverse events (number of events) compared with 'no drain' (very low certainty).

1 finding from 1 review

Retroperitoneal drainage vs no drainage after pelvic lymphadenectomy

Short‐term lymphocyst formation: both asymptomatic and symptomatic within 4 weeks after surgery · patients with gynaecological malignancies

Retroperitoneal drainage showed no clear difference in short‐term lymphocyst formation: both asymptomatic and symptomatic… compared with no drainage after pelvic lymphadenectomy (moderate certainty).

1 finding from 1 review