Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

25 questions · 25 findings · 1 reviews · Vascular

No studies found 8 · 32%GRADE not reported 9 · 36%Very low 0 · 0%Low 5 · 20%Moderate 3 · 12%High 0 · 0%

ASA with LMWH vs placebo or IVIG

Bleeding ‐ major (bleeding requiring transfusion) Length of · people with antiphospholipid antibodies and no history of thrombosis

ASA with LMWH showed no clear difference in bleeding ‐ major (bleeding requiring transfusion) Length of compared with placebo or IVIG (moderate certainty).

1 finding from 1 review

ASA with LMWH vs placebo or IVIG

Bleeding ‐ other (bleeding during first trimester) Length of · people with antiphospholipid antibodies and no history of thrombosis

ASA with LMWH showed no clear difference in bleeding ‐ other (bleeding during first trimester) Length of compared with placebo or IVIG (moderate certainty).

1 finding from 1 review

ASA with LMWH vs placebo or IVIG

Bleeding ‐ other (postpartum haemorrhage) Length of · people with antiphospholipid antibodies and no history of thrombosis

ASA with LMWH showed no clear difference in bleeding ‐ other (postpartum haemorrhage) Length of compared with placebo or IVIG (moderate certainty).

1 finding from 1 review

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