Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,501 questions · 1,558 findings · 115 reviews · Vascular

No studies found 346 · 22.2%GRADE not reported 90 · 5.8%Very low 281 · 18%Low 477 · 30.6%Moderate 313 · 20.1%High 51 · 3.3%

Subcutaneous unfractionated heparin vs unfractionated heparin

All‐cause mortality (5 days to 12 months) · people aged ≥ 18 years with a diagnosis of new or recurrent VTE

Subcutaneous unfractionated heparin showed no clear difference in all‐cause mortality (5 days to 12 months) compared with intravenous unfractionated heparin (low certainty).

1 finding from 1 review

Subcutaneous unfractionated heparin vs low molecular weight heparin

Symptomatic recurrent VTE at 3 months · people aged ≥ 18 years with a diagnosis of new or recurrent VTE

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

1 finding from 1 review

Subcutaneous unfractionated heparin vs low molecular weight heparin

Symptomatic recurrent DVT at 3 months · people aged ≥ 18 years with a diagnosis of new or recurrent VTE

Subcutaneous unfractionated heparin showed no clear difference in symptomatic recurrent DVT at 3 months compared with low molecular weight heparin (low certainty).

1 finding from 1 review

Intervention not reported

Heparin‐induced thrombocytopenia (HIT) · people undergoing surgical procedures and treated with UFH or LMWH for prophylaxis of thrombotic events lasting at least 5 days

The intervention may leads to lower heparin‐induced thrombocytopenia (HIT) (low certainty).

1 finding from 1 review

Intervention not reported

HIT in people undergoing major surgical procedures · people undergoing surgical procedures and treated with UFH or LMWH for prophylaxis of thrombotic events lasting at least 5 days

The intervention may leads to lower HIT in people undergoing major surgical procedures (low certainty).

1 finding from 1 review

Intervention not reported

HIT complicated by venous thromboembolism · people undergoing surgical procedures and treated with UFH or LMWH for prophylaxis of thrombotic events lasting at least 5 days

The intervention may leads to lower HIT complicated by venous thromboembolism (low certainty).

1 finding from 1 review

Metoprolol vs placebo

All cardiovascular death · patients of any age with AAA less than 30 mm in diameter

Metoprolol showed no clear difference in cardiovascular death, 30 days3 compared with placebo (low certainty).

2 findings from 1 review

Metoprolol vs placebo

AAA‐related death, 30 days4 · patients of any age with AAA less than 30 mm in diameter

Metoprolol showed no clear difference in AAA‐related death, 30 days4 compared with placebo (low certainty).

2 findings from 1 review

Extended prophylaxis vs another VTE extended prophylaxis

Clinically relevant non‐major bleeding Treatment duration 28 ‐ 42 days · patients with unprovoked venous thromboembolism

VTE extended prophylaxis showed no clear difference in clinically relevant non‐major bleedingf compared with another VTE extended prophylaxis (moderate certainty).

1 finding from 1 review