title: Comparative evaluation of the haemodynamic effects of continuous negative external pressure (CNEP) and positive end-expiratory pressure (PEEP) in mechanically ventilated trauma patients.
abstract: OBJECTIVE
  To compare the haemodynamic effects of identical values of continuous negative external pressure (CNEP) and positive end-expiratory pressure (PEEP) in a group of mechanically ventilated patients.
  
  
  METHODS
  General ICU, Vicenza Hospital, Italy.
  
  
  METHODS
  15 consecutive patients, admitted after road accident trauma.
  
  
  METHODS
  We compared the haemodynamic effects of ZEEP, 10 cmH2O of PEEP, and 10 cmH2O CNEP, applied in random order, in 15 head trauma patients under going controlled mechanical ventilation; 9 had associated thoracic trauma, while 6 did not have lung involvement. CNEP was obtained with a "poncho".
  
  
  RESULTS
  We observed a significant increase in CI during CNEP, compared with both ZEEP and PEEP 10 cmH2O. Accordingly the oxygen delivery index significantly increased during CNEP, compared with PEEP 10 cmH2O. Conversely, Qs/Qt decreased with CNEP, if compared with PEEP, both in patients with and without lung damage.
  
  
  CONCLUSIONS
  CNEP can significantly increase CI in mechanically ventilated patients in patients with and without associated lung damage.
authors.affiliation: Department of Anesthesia and Intensive Care, Vicenza Hospital, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Torelli
authors.forename: G
authors.initials: G
authors.lastname: Zoccali
authors.forename: M
authors.initials: M
authors.lastname: Casarin
authors.forename: F
authors.initials: F
authors.lastname: Dalla Zuanna
authors.forename: E
authors.initials: E
authors.lastname: Lieta
authors.forename: G
authors.initials: G
authors.lastname: Conti
mesh_terms: D001784:Blood Gas Analysis; D006259:Craniocerebral Trauma / Q000097:blood / Q000503:physiopathology* / Q000628:therapy; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D011175:Positive-Pressure Respiration; D015919:Ventilators, Negative-Pressure