Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

13 questions · 13 findings · 1 reviews · Vascular

No studies found 4 · 30.8%GRADE not reported 5 · 38.5%Very low 0 · 0%Low 1 · 7.7%Moderate 3 · 23.1%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