Fondaparinux 5 mg (body weight< 50 kg), 7.5 mg (body weight ≥ 50kg, ≤ 100 kg) or 10 mg (body weight > 100 kg) SC once daily was compared to unfractionated heparin IV bolus (5,000 IU) followed by a continuous IV infusion adjusted to maintain 1.5– 2.5 times aPTT control value.