List of inclusion and exclusion criteria

Inclusion Criteria:

• Hospitalization for at least one of the following medical acute medical illness:

  • Acute Class IV heart failure

  • Severe systemic infection and at least one of the following:

    • Chronic pulmonary diseases (COPD, pulmonary fibrosis, pulmonary restrictive syndrome…)
    • Obesity (as defined by the investigator)
    • Personal history of VTE
    • Age ≥ 60 years
  • Any acute event in patient with active cancer (less than 1 year from diagnosis) excluding planned hospitalization for chemotherapy
• Anticipated duration of hospitalization at least 6 days

• Health status:

  • ASA Health status score ≤ 2 (American Society of Anesthesiologists)
  • ECOG ≤ 1 in cancer patient
• Anticipated life expectancy > 1 week

Exclusion criteria:

• Major surgery or major trauma within the previous 6 weeks (orthopedic or trauma surgery to the lower extremities, gastrointestinal tract, urological, chest, gynecological surgery)
• Need for any ventilatory support (with intubation required)
• Symptomatic VTE at enrollment
• Multi organ failure
• Evidence of an active bleeding disorder

• Contraindication to anticoagulation:

  • Coagulopathy (acquired or inherited)
  • Neurosurgery within the past day 30
  • History of cerebral hemorrhage at any time
  • Known bacterial endocarditis
  • Uncontrolled arterial hypertension (systolic BP > 200 mmHg or diastolic BP > 110 mm Hg) at 2 successive readings
  • Haemostatic abnormalities: baseline platelet count <50,000/mm3, activated partial thromboplastin time (aPTT) 1.5x the upper limit of normal, or International Normalized Ratio (INR) > 1.5
  • Indication for thrombolytic therapy
  • Need for a curative treatment of anticoagulant therapy (low molecular weight heparin, unfractionated heparin, oral anticoagulant therapy)
  • Receiving LMWH or UFH at prophylactic doses for more than 72 hours prior to inclusion (patients receiving LMWH or UFH at prophylactic doses for 72 hours or less prior to entry may be included in the study)
  • Oral anticoagulant therapy within 72 hours prior to inclusion
• Cerebrovascular accident
• Prosthetic heart valves
• Confirmed cerebral metastases
• Known hypersensitivity to heparin or LMWH, or pork-derived products
• History of documented episode of heparin, or LMWH induced thrombocytopenia, and/or thrombosis (HIT, HAT, or HITTS)
• Participating in another clinical trial within the previous 30 days (patients with cancer included in a cancer treatment protocol are authorized to participate)
• Persistent renal failure (defined as a documented value of calculated creatinine clearance < 30 mL/min on at least 2 occasions ³3 days prior to entry into the study)
• Known or suspected severe anemia of unexplained cause considered clinically relevant by investigator
• Spinal or epidural analgesia or lumbar puncture within the preceding 24 hours
• Unlikely to be compliant (e.g. alcohol, drug abuse)
• Women of childbearing potential not protected by effective contraceptive method of birth control and/or who are unwilling to be tested for pregnancy (pregnancy status should be checked by serum or urine pregnancy testing prior to exposure to the investigational product)
• Refusal or inability to give informed consent to participate in the study
• Inability to be followed-up after discharge until day 90 after randomization

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.