Comparison of Low and Intermediate Dose Low-molecular-weight Heparin to Prevent Recurrent Venous Thromboembolism in Pregnancy

Symptomatic confirmed deep venous thrombosis

All events of symptomatic deep venous thrombosis in subjects will be recorded from the the date of randomization up to 3 months postpartum. Definition of symptomatic deep venous thrombosis (DVT): Suspected (recurrent) DVT with one of the following findings: If there were no previous DVT investigations: * Abnormal compression ultrasound (CUS), * An intraluminal filling defect on venography. If there was a previous DVT investigation: * Abnormal CUS where compression had been normal or, if non-compressible during screening, a substantial increase (4 mm or more) in diameter of the thrombus during full compression, * An extension of an intraluminal filling defect, or a new intraluminal filling defect or an extension of non-visualization of veins in the presence of a sudden cut-off on venography.

Time frame: From date of randomization up to 3 months postpartum

Symptomatic confirmed pulmonary embolism

All events of symptomatic pulmonary embolism in subjects will be recorded from the the date of randomization up to 3 months postpartum. Definition of symptomatic pulmonary embolism (PE): Suspected PE with one of the following findings: * A (new) intraluminal filling defect in subsegmental or more proximal branches on spiral CT scan * A (new) intraluminal filling defect or an extension of an existing defect or a new sudden cut-off of vessels more than 2.5 mm in diameter on the pulmonary angiogram * A (new) perfusion defect of at least 75% of a segment with a local normal ventilation result (high-probability) on ventilation/perfusion lung scan (VPLS)

Time frame: From date of randomization up to 3 months postpartum