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Possible Rivaroxaban Failure during the Postpartum Period
Kelly M Rudd1, Amanda R McFee Winans1, Narmadha Panneerselvam2
1Section of Clinical Pharmacy, Department of Pharmaceutical Care Services, Bassett Medical Center, Cooperstown, New York.
Pharmacotherapy
|November 25, 2015
Summary
Direct-acting oral anticoagulants (DOACs) like rivaroxaban may be less effective in the postpartum period due to physiological changes. This case highlights potential rivaroxaban failure in a postpartum patient with deep vein thrombosis and pulmonary embolism.
Area of Science:
- Pharmacology
- Obstetrics
- Hematology
Background:
- Direct-acting oral anticoagulants (DOACs) are increasingly used for venous thromboembolism (VTE) treatment and prevention.
- Pregnancy-induced physiological changes significantly alter drug pharmacokinetics and increase hypercoagulability postpartum.
- Limited data exist on DOAC dosing and efficacy during the postpartum period (6-8 weeks after delivery).
Observation:
- A 35-year-old postpartum woman presented with new-onset multiple segmental pulmonary embolism (PE) five days after initiating rivaroxaban for deep vein thrombosis (DVT).
- No precipitating factors for thrombosis or treatment noncompliance were identified.
- Rivaroxaban was discontinued, and the patient was treated with heparin, transitioned to enoxaparin, and then warfarin.
Findings:
- This case represents the first reported instance of potential rivaroxaban failure in the postpartum period.
- Postpartum pharmacokinetic alterations may lead to decreased rivaroxaban exposure and reduced anticoagulant efficacy.
- The patient experienced recurrent PE despite appropriate rivaroxaban therapy initiation.
Implications:
- Clinicians must carefully consider the risks and benefits of DOACs in postpartum patients due to potential efficacy alterations.
- Further research is needed to understand the impact of postpartum pharmacokinetic changes on DOACs.
- Development of monitoring assays for DOACs in special populations is warranted to ensure therapeutic efficacy and patient safety.
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