A 27-year-old woman who is pregnant at 32 weeks’ gestation presents to the emergency department following a motor vehicle accident. Results of fetal heart monitoring are reassuring, and there is no evidence of rupture of membranes. Radiologic studies show a fractured femur. The patient is admitted to the hospital for expectant management and is placed on strict bed rest with delivery planned at 37 weeks’ gestation. Which of the following medications would be most appropriate for preventing deep venous thrombosis in this patient?
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