All‐cause mortality
Heparin prophylaxis showed no clear difference in mortality compared with no prophylaxis (moderate certainty).
2 findings from 1 review
Symptomatic VTE
Heparin prophylaxis leads to lower symptomatic VTE compared with no prophylaxis (high certainty).
1 finding from 1 review
Major bleeding
Heparin prophylaxis showed no clear difference in major bleeding compared with no prophylaxis (moderate certainty).
1 finding from 1 review
Minor bleeding
Heparin prophylaxis leads to higher minor bleeding compared with no prophylaxis (high certainty).
1 finding from 1 review
Thrombocytopenia
Heparin prophylaxis showed no clear difference in thrombocytopenia compared with no prophylaxis (moderate certainty).
1 finding from 1 review
Quality of life impairment
1 finding from 1 review
All‐cause mortality (main analysis ‐ active cancer) · patients with cancer with venous thromboembolism
Low molecular weight heparin secondary prophylaxis showed no clear difference in all‐cause mortality (main analysis ‐ active cancer) compared with vitamin K antagonist secondary prophylaxis (low certainty).
1 finding from 1 review
All‐cause mortality (time‐to‐event) · patients with cancer with venous thromboembolism
Low molecular weight heparin secondary prophylaxis showed no clear difference in all‐cause mortality (time‐to‐event) compared with vitamin K antagonist secondary prophylaxis (low certainty).
1 finding from 1 review
Recurrent venous thromboembolism (main analysis ‐ active cancer) · patients with cancer with venous thromboembolism
Low molecular weight heparin secondary prophylaxis probably leads to lower recurrent venous thromboembolism (main analysis ‐ active cancer) compared with vitamin K antagonist secondary prophylaxis (moderate certainty).
1 finding from 1 review
Recurrent venous thromboembolism · patients with cancer with venous thromboembolism
Low molecular weight heparin secondary prophylaxis probably leads to lower recurrent venous thromboembolism (time‐to‐event) compared with vitamin K antagonist secondary prophylaxis (moderate certainty).
1 finding from 1 review
Major bleeding · patients with cancer with venous thromboembolism
Low molecular weight heparin secondary prophylaxis showed no clear difference in major bleeding (main analysis ‐ active cancer) compared with vitamin K antagonist secondary prophylaxis (low certainty).
1 finding from 1 review
Minor bleeding (main analysis ‐ active cancer) · patients with cancer with venous thromboembolism
It is very uncertain whether low molecular weight heparin secondary prophylaxis changes minor bleeding (main analysis ‐ active cancer) compared with vitamin K antagonist secondary prophylaxis (very low certainty).
1 finding from 1 review
Thrombocytopenia (main analysis‐ active cancer) · patients with cancer with venous thromboembolism
Low molecular weight heparin secondary prophylaxis showed no clear difference in thrombocytopenia (main analysis‐ active cancer) compared with vitamin K antagonist secondary prophylaxis (low certainty).
1 finding from 1 review
Maternal death · pregnant women at increased risk of VTE during pregnancy and the early postnatal period
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Symptomatic thromboembolic events ( · pregnant women at increased risk of VTE during pregnancy and the early postnatal period
It is very uncertain whether antenatal (± postnatal) prophylaxis: heparin (LMWH or UFH) changes symptomatic thromboembolic events ( compared with no treatment/placebo (very low certainty).
1 finding from 1 review
Symptomatic PE · pregnant women at increased risk of VTE during pregnancy and the early postnatal period
It is very uncertain whether antenatal (± postnatal) prophylaxis: heparin (LMWH or UFH) changes symptomatic PE ( compared with no treatment/placebo (very low certainty).
1 finding from 1 review
Symptomatic DVT · pregnant women at increased risk of VTE during pregnancy and the early postnatal period
It is very uncertain whether antenatal (± postnatal) prophylaxis: heparin (LMWH or UFH) changes symptomatic DVT ( compared with no treatment/placebo (very low certainty).
1 finding from 1 review
Adverse effects sufficient to stop treatment · pregnant women at increased risk of VTE during pregnancy and the early postnatal period
It is very uncertain whether antenatal (± postnatal) prophylaxis: heparin (LMWH or UFH) changes adverse effects sufficient to stop treatment compared with no treatment/placebo (very low certainty).
1 finding from 1 review
Maternal death · women giving birth by elective or emergency caesarean (elective only (1 trial), emergency or elective (4 trials))
1 finding from 1 review
Symptomatic thromboembolic events ( · women giving birth by elective or emergency caesarean (elective only (1 trial), emergency or elective (4 trials))
It is very uncertain whether peripartum/postnatal prophylaxis (caesarean): heparin (LMWH or UFH) changes symptomatic thromboembolic events (timing of assessment unclear,… compared with no treatment/placebo (very low certainty).
1 finding from 1 review