Protective Effect of Propofol Against Hemolysis in Patients Submitted to Gastroplasty

Inclusion Criteria: * patients between BMI 40-50 kg/m2 Exclusion Criteria: * patients with BMI under 40 kg/m2 and over 50 kg/m2 * alcohol users * illicit-drug users * patients in regular use of anti-depressants, proton bomb inhibitors or calcium canal blockers * patients transfused either recently, during the intra-operative period or within 10 hours post-operative * patients previously known to be hypersensitive to any drug that is used during the study * patients with any psychiatric disorder or dementia