What do systematic reviews say?

Heparin vs pentasaccharide

• Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery 2022 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 198 participants
  Very low

Heparin started before vs after the surgical procedure

• Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery 2022 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 100 participants
  Very low

IPC plus pharmacological prophylaxis vs mechanical prophylaxis alone

• Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery 2022 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 150 participants
  Low

Higher‐dose heparin vs standard‐dose heparin

• Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery 2022 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 597 participants
  Low

Standard testing plus PET/CT scanning vs standard testing alone

The review found no eligible studies for this question.

• Effect of testing for cancer on cancer‐ or venous thromboembolism (VTE)‐related mortality and morbidity in people with… 2021 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Extensive tests vs tests at the physician's discretion

The review found no eligible studies for this question.

• Effect of testing for cancer on cancer‐ or venous thromboembolism (VTE)‐related mortality and morbidity in people with… 2021 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Extended prophylaxis vs placebo

Extended prophylaxis showed no clear difference in VTE‐related mortalitya compared with placebo (low certainty).

• Secondary prevention of recurrent venous thromboembolism after initial oral anticoagulation therapy in patients with… 2017 · Cochrane Headline outcomes only
  OR 0.98 [0.14, 6.98]
  4 studies · 1862 participants
  Low

Extended prophylaxis vs another VTE extended prophylaxis

The review found no eligible studies for this question.

• Secondary prevention of recurrent venous thromboembolism after initial oral anticoagulation therapy in patients with… 2017 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Subcutaneous unfractionated heparin vs low molecular weight heparin

Subcutaneous unfractionated heparin showed no clear difference in VTE‐related mortality at 3 months compared with low molecular weight heparin (low certainty).

• Subcutaneous unfractionated heparin for the initial treatment of venous thromboembolism 2017 · Cochrane Headline outcomes only
  OR 0.53 [0.17, 1.67]
  8 studies · 2469 participants
  Low

Subcutaneous unfractionated heparin vs unfractionated heparin

Subcutaneous unfractionated heparin showed no clear difference in VTE‐related mortality at 3 months compared with intravenous unfractionated heparin (low certainty).

• Subcutaneous unfractionated heparin for the initial treatment of venous thromboembolism 2017 · Cochrane Headline outcomes only
  OR 0.98 [0.2, 4.88]
  9 studies · 1168 participants
  Low