Initial Management of Thromboembolism in Obstetrics

Immediate Actions and Anticoagulation

The American College of Cardiology recommends initiating therapeutic-dose low-molecular-weight heparin (LMWH) immediately for pregnant women with acute VTE, without waiting for confirmatory testing if clinical suspicion is high, and continuing anticoagulation throughout pregnancy and for at least 6 weeks postpartum 1
For suspected PE with hemodynamic instability, consideration of systemic thrombolysis is required, despite very low certainty of evidence 1
For suspected PE with right ventricular dysfunction but stable blood pressure, thrombolysis is not recommended; proceed with anticoagulation alone 1
The American College of Cardiology suggests that LMWH is strongly preferred over unfractionated heparin due to better bioavailability, longer half-life, more predictable anticoagulation, lower bleeding risk, and reduced risk of heparin-induced thrombocytopenia 1

For pregnant women with low-risk acute VTE, initiate outpatient therapy rather than hospital admission, with criteria including normal vital signs, no severe pain, non-extensive VTE, no maternal comorbidities, adequate home support, and no contraindications to LMWH 1, 2
High-risk features requiring admission include advanced gestational age, extensive proximal DVT or large PE, right ventricular dysfunction on imaging, and any hemodynamic instability 1, 2

The guideline recommends against delaying anticoagulation waiting for diagnostic confirmation in moderate-to-high probability cases 1
Warfarin and direct oral anticoagulants are contraindicated during pregnancy 1, 3
Thrombolysis should not be withheld in truly life-threatening PE despite pregnancy, with maternal survival being the priority 1

Continue therapeutic anticoagulation throughout the remainder of pregnancy and for at least 6 weeks postpartum, with a minimum total treatment duration of 3-6 months 1, 3