Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

300 questions · 309 findings · 25 reviews · Headline outcomes only

No studies found 53 · 17.2%GRADE not reported 11 · 3.6%Very low 41 · 13.3%Low 94 · 30.4%Moderate 80 · 25.9%High 30 · 9.7%

ASA + high‐dose LMWH vs ASA + low‐dose LMWH or UFH

Subcutaneous bruises · people with antiphospholipid antibodies and no history of thrombosis

ASA + high‐dose LMWH showed no clear difference in subcutaneous bruises compared with ASA + low‐dose LMWH or UFH (low certainty).

1 finding from 1 review

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

Vitamin K antagonists vs placebo

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

Vitamin K antagonists showed no clear difference in bleeding ‐ major Treatment duration 28 ‐ 42 days compared with placebo (low certainty).

1 finding from 1 review

Vitamin K antagonists 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

DOAC vs placebo

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

DOAC probably leads to lower symptomatic VTE (DVT and PE) Treatment duration 28 ‐ 42 days compared with placebo (moderate certainty).

1 finding from 1 review

DOAC vs placebo

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

DOAC leads to lower symptomatic DVT (proximal or distal) Treatment duration 28 ‐ 42 days compared with placebo (high certainty).

1 finding from 1 review

DOAC 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

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

1 finding from 1 review

DOAC vs placebo

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

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

1 finding from 1 review

DOAC 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

DOAC showed no clear difference in bleeding‐ clinically relevant non‐major Treatment duration 28 ‐ 42… compared with placebo (moderate certainty).

1 finding from 1 review

DOAC vs placebo

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

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

1 finding from 1 review