title: Determinants of distance walked during the six-minute walk test in patients undergoing cardiac surgery at hospital discharge.
abstract: BACKGROUND
  The aim of this study was to identify the determinants of distance walked in six-minute walk test (6MWD) in patients undergoing cardiac surgery at hospital discharge.
  
  
  METHODS
  The assessment was performed preoperatively and at discharge. Data from patient records were collected and measurement of the Functional Independence Measure (FIM) and the Nottingham Health Profile (NHP) were performed. The six-minute walk test (6MWT) was performed at discharge. Patients undergoing elective cardiac surgery, coronary artery bypass grafting or valve replacement were eligible. Patients older than 75 years who presented arrhythmia during the protocol, with psychiatric disorders, muscular or neurological disorders were excluded from the study.
  
  
  RESULTS
  Sixty patients (44.26% male, mean age 51.53 ± 13 years) were assessed. In multivariate analysis the following variables were selected: type of surgery (P = 0.001), duration of cardiopulmonary bypass (CPB) (P = 0.001), Functional Independence Measure - FIM (0.004) and body mass index - BMI (0.007) with r = 0.91 and r2 = 0.83 with P < 0.001. The equation derived from multivariate analysis: 6MWD = Surgery (89.42) + CPB (1.60) + MIF (2.79 ) - BMI (7.53) - 127.90.
  
  
  CONCLUSIONS
  In this study, the determinants of 6MWD in patients undergoing cardiac surgery were: the type of surgery, CPB time, functional capacity and body mass index.
authors.forename: Géssica Uruga
authors.initials: GU
authors.lastname: Oliveira
authors.forename: Vitor
authors.initials: V
authors.lastname: Oliveira Carvalho
authors.forename: Lucas Pereira
authors.initials: LP
authors.lastname: de Assis Cacau
authors.forename: Amaro Afrânio
authors.initials: AA
authors.lastname: de Araújo Filho
authors.forename: Manoel Luiz
authors.initials: ML
authors.lastname: de Cerqueira Neto
authors.forename: Walderi Monteiro
authors.initials: WM
authors.lastname: da Silva
authors.forename: Telma Cristina Fontes
authors.initials: TC
authors.lastname: Cerqueira
authors.affiliation: Departamento de Fisioterapia da Universidade Federal de Sergipe - UFS, Aracaju, SE, Brazil. vjsf@infonet.com.br.
authors.forename: Valter Joviniano
authors.initials: VJ
authors.lastname: de Santana Filho
mesh_terms: D015992:Body Mass Index; D006348:Cardiac Surgical Procedures; D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance / Q000502:physiology*; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D010351:Patient Discharge / Q000592:standards*; D011184:Postoperative Period; D011237:Predictive Value of Tests; D057234:Preoperative Period; D011379:Prognosis; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013997:Time Factors; D016138:Walking / Q000502:physiology*