Collaborative Risk-stratified Investigation in Thrombosis-prone Inpatients With Critical Illness: Anticoagulation With LMWH in Teens for ThromboProphylaxis (CRITICAL-Teens-TP).

Critically ill adolescents are at greatest risk for developing hospital-acquired venous thromboembolism. To date, no phase 3 randomized controlled trials have been conducted for pharmacological thromboprophylaxis as primary venous thromboembolism prevention in children. The investigators will perform a United States definitive multicenter phase 3 randomized controlled trial of the low molecular weight heparin enoxaparin as primary venous thromboembolism prophylaxis among critically ill adolescents who are classified a priori as high risk based upon the investigators validated risk prediction models.