Gap finder

Search review questions

Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Words match anywhere in the field.

Limit to evidence status or GRADE (optional)

1,521 questions in 132 reviews · Hepato-Biliary

current versions
No studies 303 · 19.9%Ungraded 39 · 2.6%Very low 876 · 57.6%Low 216 · 14.2%Moderate 65 · 4.3%High 22 · 1.4%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

QuestionEffectEvidenceStatus / GRADE
Summary of findings table ‐ Intraperitoneal local anaesthetic vs control
Serious adverse events · patients undergoing laparoscopic cholecystectomy
Intraperitoneal local anaesthetic instillation versus no intraperitoneal local anaesthetic instillation for… (2021) · Cochrane
RR 1.07 [0.49, 2.34]13 studies · 988 participantsVery low
Summary of findings table ‐ Intraperitoneal local anaesthetic vs control
Health related quality of life ‐ not measured · patients undergoing laparoscopic cholecystectomy
Intraperitoneal local anaesthetic instillation versus no intraperitoneal local anaesthetic instillation for… (2021) · Cochrane
no estimate extractedNRNo studies
Summary of findings table ‐ Intraperitoneal local anaesthetic vs control
Hospital stay · patients undergoing laparoscopic cholecystectomy
Intraperitoneal local anaesthetic instillation versus no intraperitoneal local anaesthetic instillation for… (2021) · Cochrane
no estimate extracted12 studies · 936 participantsModerate
Summary of findings table ‐ Intraperitoneal local anaesthetic vs control
Proportion discharged as day surgery · patients undergoing laparoscopic cholecystectomy
Intraperitoneal local anaesthetic instillation versus no intraperitoneal local anaesthetic instillation for… (2021) · Cochrane
RR 1.43 [0.64, 3.2]3 studies · 242 participantsVery low
Summary of findings table ‐ Intraperitoneal local anaesthetic vs control
Pain (4 to 8 hours)Scale from: 1 to 10 · patients undergoing laparoscopic cholecystectomy
Intraperitoneal local anaesthetic instillation versus no intraperitoneal local anaesthetic instillation for… (2021) · Cochrane
no estimate extracted57 studies · 4046 participantsLow
Summary of findings table ‐ Intraperitoneal local anaesthetic vs control
Pain (9 to 24 hours)Scale from: 1 to 10 · patients undergoing laparoscopic cholecystectomy
Intraperitoneal local anaesthetic instillation versus no intraperitoneal local anaesthetic instillation for… (2021) · Cochrane
no estimate extracted52 studies · 3588 participantsLow
Summary of Findings Table ‐ Electrocoagulation alone vs control (vehicle solution of allopurinol by mouth)
All‐cause mortality at last · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
RR 0.98 [0.94, 1.03]1 study · 113 participantsVery low
Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)
Tumour response · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
no estimate extractedNRNo studies
Summary of Findings Table ‐ Electrocoagulation alone vs control (vehicle solution of allopurinol by mouth)
Post‐operative deaths · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
RR 1.03 [0.07, 16.12]1 study · 152 participantsVery low
Summary of Findings Table ‐ Electrocoagulation alone vs control (vehicle solution of allopurinol by mouth)
Other adverse events and complications · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
no estimate extractedNRNo studies
Summary of Findings Table ‐ Electrocoagulation alone vs control (vehicle solution of allopurinol by mouth)
Failure to clear liver metastases or recurrence of liver metastases · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
no estimate extractedNRNo studies
Summary of Findings Table ‐ Electrocoagulation alone vs control (vehicle solution of allopurinol by mouth)
Tumour response · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
no estimate extractedNRNo studies
Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)
All‐cause mortality at last · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
RR 0.87 [0.8, 0.95]1 study · 165 participantsLow
Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)
Post‐operative deaths · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
RR 0.99 [0.09, 11.06]1 study · 231 participantsVery low
Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)
Other adverse events and complications · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
no estimate extractedNRNo studies
Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)
Failure to clear liver metastases or recurrence of liver metastases · people with liver metastases
Electrocoagulation for liver metastases (2021) · Cochrane
no estimate extractedNRNo studies
Band ligation vs sham or no intervention
All‐cause mortality · children with portal hypertension and large oesophageal varices, without previous gastrointestinal bleeding or…
Band ligation versus sham or no intervention for primary prophylaxis of oesophageal variceal bleeding in… (2021) · Cochrane
RR 2.54 [0.11, 56.25]1 study · 22 participantsVery low
Band ligation vs sham or no intervention
Serious adverse events Idiopathic thrombocytopaenic purpura · children with portal hypertension and large oesophageal varices, without previous gastrointestinal bleeding or…
Band ligation versus sham or no intervention for primary prophylaxis of oesophageal variceal bleeding in… (2021) · Cochrane
RR 0.28 [0.01, 6.25]1 study · 22 participantsVery low
Band ligation vs sham or no intervention
Health‐related quality of life · children with portal hypertension and large oesophageal varices, without previous gastrointestinal bleeding or…
Band ligation versus sham or no intervention for primary prophylaxis of oesophageal variceal bleeding in… (2021) · Cochrane
no estimate extractedNRNo studies
Band ligation vs sham or no intervention
Oesophageal variceal bleeding · children with portal hypertension and large oesophageal varices, without previous gastrointestinal bleeding or…
Band ligation versus sham or no intervention for primary prophylaxis of oesophageal variceal bleeding in… (2021) · Cochrane
RR 0.28 [0.03, 2.27]1 study · 22 participantsVery low
Band ligation vs sham or no intervention
Adverse events considered not serious · children with portal hypertension and large oesophageal varices, without previous gastrointestinal bleeding or…
Band ligation versus sham or no intervention for primary prophylaxis of oesophageal variceal bleeding in… (2021) · Cochrane
no estimate extractedNRNo studies
Vitamin D vs placebo or no intervention
All‐cause mortality · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
RR 0.86 [0.51, 1.45]27 studies · 1979 participantsVery low
Vitamin D vs placebo or no intervention
Liver‐related mortality · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
RR 1.62 [0.08, 34.66]1 study · 18 participantsVery low
Vitamin D vs placebo or no intervention
Serious adverse events · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
no estimate extractedNRVery low
Vitamin D vs placebo or no intervention
Liver‐related morbidity · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
no estimate extracted0 studies · 0 participantsUngraded
Vitamin D vs placebo or no intervention
Health‐related quality of life · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
no estimate extracted0 studies · 0 participantsUngraded
Vitamin D vs placebo or no intervention
Non‐serious adverse events · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
no estimate extractedNRVery low
Vitamin D vs placebo or no intervention
Failure of sustained virological response · people with chronic liver diseases
Vitamin D supplementation for chronic liver diseases in adults (2021) · Cochrane
RR 0.65 [0.42, 1.01]7 studies · 630 participantsVery low
Adjuvant chemotherapy vs no chemotherapy
All‐cause mortality at 5 years · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
RR 0.92 [0.84, 1.01]4 studies · 867 participantsVery low
Adjuvant chemotherapy vs no chemotherapy
Serious adverse events · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
RR 17.82 [2.43, 130.82]1 study · 219 participantsVery low
Adjuvant chemotherapy vs no chemotherapy
Health‐related quality of life · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
no estimate extractedNRNo studies
Adjuvant chemotherapy vs no chemotherapy
Cancer‐related mortality · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
no estimate extractedNRNo studies
Adjuvant chemotherapy vs no chemotherapy
TIme to recurrence of the tumour · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
no estimate extractedNRNo studies
Adjuvant chemotherapy vs no chemotherapy
Non‐serious adverse events · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
no estimate extractedNRNo studies
Adjuvant S‐1 vs gemcitabine
All‐cause mortality: 1‐year overall survival · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
RR 0.38 [0.15, 0.96]1 study · 70 participantsVery low
Adjuvant S‐1 vs gemcitabine
All‐cause mortality: 2‐year overall survival · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
RR 0.81 [0.58, 1.13]1 study · 70 participantsVery low
Adjuvant S‐1 vs gemcitabine
Serious adverse events · people with resectable cholangiocarcinoma
Postoperative adjuvant chemotherapy for resectable cholangiocarcinoma (2021) · Cochrane
no estimate extracted1 study · 70 participantsVery low
Intervention NR
Interventions · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Portocaval shunt(No direct RCT) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
HR 0.51 [0.06, 2.92]NRVery low
Intervention NR
Variceal band ligation(5 RCTs, 372 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
OR 0.75 [0.02, 23.24]NRVery low
Intervention NR
Sclerotherapy(1 RCT, 85 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
OR 0.55 [0, 272.05]NRVery low
Intervention NR
Variceal band ligation(1 RCT, 168 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
no estimate extractedNRLow
Intervention NR
No active intervention(2 RCTs, 256 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
OR 0.28 [0.02, 2.91]NRVery low
Intervention NR
Variceal band ligation(7 RCTs, 728 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
OR 1.6 [0.54, 5.15]NRVery low
Intervention NR
Sclerotherapy(No direct RCT) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
OR 1.19 [0.02, 80.24]NRVery low
Intervention NR
Beta‐blockers + nitrates(1 RCT, 57 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
OR 3.41 [1.11, 11.28]NRLow
Intervention NR
No active intervention(No direct RCT) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
no estimate extractedNRVery low
Intervention NR
Variceal band ligation(4 RCTs, 480 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
no estimate extractedNRLow
Intervention NR
Beta‐blockers · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Sclerotherapy(2 RCTs, 90 participants) · people with liver cirrhosis and oesophageal varices with no history of bleeding
Primary prevention of variceal bleeding in people with oesophageal varices due to liver cirrhosis: a network… (2021) · Cochrane
no estimate extractedNRLow