BACKGROUND Anticoagulation during cardiopulmonary bypass (CPB) is usually adapted to total body weight (TBW). This may be inaccurate in obese patients and lead to heparin overdose with a risk of bleeding. OBJECTIVES To validate the efficacy and safety of an adjusted calculation model of heparin dosing based on ideal body weight (IBW) rather than TBW in obese CPB patients, with an expected target mean plasma heparin concentration of 4.5 IU ml−1 after onset of CPB in the experimental group. DESIGN Prospective, randomised controlled study. SETTING University hospital. PATIENTS Sixty obese patients (BMI ≥ 30 kg m−2) scheduled for CPB were included from January to June 2016. INTERVENTIONS Patients received a bolus dose of unfractionated heparin of either 300 IU kg−1 of TBW or 340 IU kg−1 of IBW before onset of CPB. Additional adjusted boluses were injected to maintain an activated clotting time (ACT) of at least 400 s. MAIN OUTCOME MEASURES Plasma heparin concentration and ACT were measured at different time points. Total heparin doses and transfusion requirements were recorded. RESULTS The target heparin concentration of 4.5 IU ml−1 was reached in the IBW group at the onset of CPB and maintained at all time points during CPB. Heparin concentrations were significantly higher in the TBW group after the bolus (6.52 ± 0.97 vs. 4.54 ± 1.13 IU ml−1, P
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