title: Predictors of red blood cell transfusion after cardiac surgery: a prospective cohort study.
abstract: OBJECTIVE
  To identify predictors of red blood cell transfusion (RBCT) after cardiac surgery.
  
  
  METHODS
  A prospective cohort study performed with 323 adults after cardiac surgery, from April to December of 2013. A data collection instrument was constructed by the researchers containing factors associated with excessive bleeding after cardiac surgery, as found in the literature, for investigation in the immediate postoperative period. The relationship between risk factors and the outcome was assessed by univariate analysis and logistic regression.
  
  
  RESULTS
  The factors associated with RBCT in the immediate postoperative period included lower height and weight, decreased platelet count, lower hemoglobin level, higher prevalence of platelet count <150x10(3)/mm (3), lower volume of protamine, longer duration of anesthesia, higher prevalence of intraoperative RBCT, lower body temperature, higher heart rate and higher positive end-expiratory pressure. The independent predictor was weight <66.5Kg.
  
  
  CONCLUSIONS
  Factors associated with RBCT in the immediate postoperative period of cardiac surgery were found. The independent predictor was weight.
authors.affiliation: Universidade Federal de São Paulo, Escola Paulista de Enfermagem, São Paulo, SP, Brazil.|Universidade de São Paulo, Hospital Universitário, São Paulo, SP, Brazil.
authors.forename: Camila Takao
authors.initials: CT
authors.lastname: Lopes
authors.affiliation: Instituto Dante Pazzanese de Cardiologia, São Paulo, SP, Brazil.
authors.forename: Evelise Helena Fadini Reis
authors.initials: EH
authors.lastname: Brunori
authors.affiliation: Universidade Federal de São Paulo, Escola Paulista de Enfermagem, São Paulo, SP, Brazil.
authors.forename: Agueda Maria Ruiz Zimmer
authors.initials: AM
authors.lastname: Cavalcante
authors.affiliation: University of Iowa, College of Nursing, Iowa City, IA, EUA.
authors.forename: Sue Ann
authors.initials: SA
authors.lastname: Moorhead
authors.affiliation: Universidade Federal de São Paulo, Escola Paulista de Enfermagem, São Paulo, SP, Brazil.
authors.forename: Juliana de Lima
authors.initials: Jde L
authors.lastname: Lopes
authors.affiliation: Universidade Federal de São Paulo, Escola Paulista de Enfermagem, São Paulo, SP, Brazil.
authors.forename: Alba Lucia Bottura Leite de
authors.initials: AL
authors.lastname: Barros
mesh_terms: D000368:Aged; D006348:Cardiac Surgical Procedures; D015331:Cohort Studies; D017707:Erythrocyte Transfusion / Q000706:statistics & numerical data*; D005260:Female; D005544:Forecasting; D006801:Humans; D008297:Male; D008875:Middle Aged; D011182:Postoperative Care / Q000706:statistics & numerical data*; D011446:Prospective Studies