title: [Comparative clinical evaluation of 4 heat and moisture exchangers (HME) in general anesthesia].
abstract: OBJECTIVE
  To determine the efficiency, during general anaesthesia, of four commercially available HMEs, with particular attention to the change of performances due to the new modifications introduced by the manufacturers.
  
  
  METHODS
  Comparisons of the performances of each HMEs with psychometric method in terms of T degree C, RH (%), AH (mgH2O/1) of inhaled and expired gases.
  
  
  METHODS
  A sample of 28 patients under general anesthesia longer than 150 minutes, undergone elective urological surgery. Patients with cardiological, respiratory and metabolic impairments have been excluded.
  
  
  RESULTS
  The measurements of T degree C, RH and AH have been performed with thermometric probes every minute. The collected data have been analyzed by Student's "t"-test for unpaired data.
  
  
  CONCLUSIONS
  The obtained data show that a good conditioning of the inhaled gases is possible, although only few HMEs satisfy the requirements indicated in the ISO and BSI standards.
authors.affiliation: Dipartimento di Scienze Neuropsichiche, IRCCS S. Raffaele, Milano.
authors.forename: G
authors.initials: G
authors.lastname: Cornaggia
authors.forename: G
authors.initials: G
authors.lastname: Chidini
authors.forename: L
authors.initials: L
authors.lastname: Stella
mesh_terms: D000328:Adult; D000368:Aged; D000768:Anesthesia, General; D005260:Female; D006358:Hot Temperature; D006801:Humans; D006813:Humidity; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D012122:Ventilators, Mechanical
vernacular_title: Valutazione clinica comparativa di quattro scambiatori di calore e umidità (HME) in corso di anestesia generale.