title: Resistance and reactance in patients undergoing coronary artery bypass.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the effect of different surgical variables, such as perfusion duration and number of grafts, on resistance and reactance, in heart surgery patients.
  
  
  METHODS
  77 patients submitted to coronary artery bypass were studied. The variable concerning time of extracorporeal circulation was classified in four progressive degrees. Resistance and reactance measurements were performed and compared to time of extracorporeal circulation and to number of grafts. Ten measurements were performed by bioelectrical impedance equipment.
  
  
  RESULTS
  The comparison of reactance before surgery to the first measurement at the first postoperative day, for the different times of extracorporeal circulation, showed decrease (p = 0.01). Regarding gender, resistance and reactance showed significant differences (p < 0.001). There was also significant difference (p = 0.001) for the number of grafts.
  
  
  CONCLUSIONS
  The decrease of resistance and reactance is related not only with surgery procedure, but also with the number of grafts and time of extracorporeal circulation.
authors.affiliation: UNIFESP-EPM, Médico do GANEP (Grupo de Apoio de Nutrição Enteral e Parenteral), Hospital Beneficência Portuguesa, São Paulo, SP, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Bottoni
authors.forename: D
authors.initials: D
authors.lastname: Marco
authors.forename: G Pereira da Costa
authors.initials: GP
authors.lastname: Oliveira
authors.forename: A
authors.initials: A
authors.lastname: Bottoni
authors.forename: M de Lourdes Teixeria
authors.initials: Mde L
authors.lastname: da Silva
authors.forename: D Linetzky
authors.initials: DL
authors.lastname: Waitzberg
mesh_terms: D000328:Adult; D000368:Aged; D001026:Coronary Artery Bypass; D017097:Electric Impedance; D005112:Extracorporeal Circulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009204:Myocardial Revascularization / Q000379:methods; D010477:Perfusion / Q000379:methods; D011182:Postoperative Care; D011184:Postoperative Period