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What do systematic reviews say?

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Evidence found and GRADE certainty

6 questions · 6 findings · 1 reviews · Vascular

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No studies found 1 · 16.7%GRADE not reported 0 · 0%Very low 0 · 0%Low 1 · 16.7%Moderate 2 · 33.3%High 2 · 33.3%

Heparin vs placebo

Symptomatic VTE · people requiring prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

Heparin showed no clear difference in symptomatic VTE (DVT and PE) Treatment duration 28 ‐ 42 days compared with placebo (high certainty).

1 finding from 1 review

Heparin vs placebo

Symptomatic DVT · people requiring prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

Heparin showed no clear difference in symptomatic DVT (proximal or distal) Treatment duration 28 ‐ 42 days compared with placebo (moderate certainty).

1 finding from 1 review

Heparin vs placebo

Symptomatic PE Treatment duration 28 ‐ 42 days · people requiring prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

Heparin showed no clear difference in symptomatic PE Treatment duration 28 ‐ 42 days compared with placebo (low certainty).

1 finding from 1 review

Heparin vs placebo

Major bleeding · people requiring prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

Heparin showed no clear difference in bleeding ‐ major Treatment duration 28 ‐ 42 days compared with placebo (moderate certainty).

1 finding from 1 review

Heparin vs placebo

Clinically relevant non‐major bleeding Treatment duration 28 ‐ 42 days · people requiring prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

The review found no eligible studies for this question.

1 finding from 1 review

Heparin vs placebo

Minor bleeding · people requiring prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

Heparin leads to higher bleeding ‐ minor Treatment duration 28 ‐ 42 days compared with placebo (high certainty).

1 finding from 1 review