title: Interference of heart and transcutaneous oxygen monitoring in the measurement of bioelectrical impedance analysis in preterm newborns.
abstract: OBJECTIVE
  To verify if the connection of electrodes for heart and transcutaneous oxygen monitoring interfere with the measurement of electrical bioimpedance in preterm newborns.
  
  
  METHODS
  This was a prospective, blinded, controlled, cross-sectional, crossover study that assessed and compared paired measures of resistance (R) and reactance (Xc) by BIA, obtained with and without monitoring wires attached to the preterm newborn. The measurements were performed in immediate sequence, after randomization to the presence or absence of electrodes. The sample size calculated was 114 measurements or tests with monitoring wires and 114 without monitoring wires, considering for a difference between the averages of 0.1 ohms, with an alpha error of 10% and beta error of 20%, with significance <0.05.
  
  
  RESULTS
  No differences were observed between the R (677.37±196.07 vs. 677.46±194.86) and Xc (31.15±9.36 vs. 31.01±9.56) values obtained with and without monitoring wires, respectively, with good correlation between them (R: 0.997 and Xc: 0.968).
  
  
  CONCLUSIONS
  The presence of heart and/or transcutaneous oxygen monitoring wires connected to the preterm newborn did not affect the values of R or Xc measured by BIA, allowing them to be carried out in this population without risks.
authors.affiliation: Universidade Federal Fluminense (UFF), Niterói, RJ, Brazil. Electronic address: viviane.comym@gmail.com.
authors.forename: Viviane C
authors.initials: VC
authors.lastname: Comym
authors.affiliation: Universidade Federal Fluminense (UFF), Niterói, RJ, Brazil.
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Macedu
authors.affiliation: Universidade Federal Fluminense (UFF), Niterói, RJ, Brazil.
authors.forename: Eduardo K P B
authors.initials: EK
authors.lastname: Neves
authors.affiliation: Universidade Federal Fluminense (UFF), Departamento Materno Infantil, Niterói, RJ, Brazil.
authors.forename: Arnaldo C
authors.initials: AC
authors.lastname: Bueno
authors.affiliation: Universidade Federal Fluminense (UFF), Niterói, RJ, Brazil.
authors.forename: Herminia C
authors.initials: HC
authors.lastname: Fernandez
authors.affiliation: Fundação Oswaldo Cruz (Fiocruz), Instituto Fernandes Figueira (IFF), Rio de Janeiro, RJ, Brazil.
authors.forename: Maria E L
authors.initials: ME
authors.lastname: Moreira
authors.affiliation: Universidade Federal Fluminense (UFF), Departamento Materno Infantil, Niterói, RJ, Brazil.
authors.forename: Alan A
authors.initials: AA
authors.lastname: Vieira
mesh_terms: D001785:Blood Gas Monitoring, Transcutaneous / Q000295:instrumentation; D018592:Cross-Over Studies; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D004566:Electrodes; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000379:methods; D016037:Single-Blind Method
keywords: Body composition; Composição corporal; Electrical impedance; Impedância elétrica; Neonate; Recém-nascido