title: Changes in FiO2 affect PaO2 with minor alterations in cerebral concentration of oxygenated hemoglobin during liquid ventilation in healthy piglets.
abstract: OBJECTIVE
  To measure the impact of changes in the fraction of inspired oxygen (FiO2) on systemic and cerebral oxygen supply in gas and liquid ventilated healthy animals.
  
  
  METHODS
  Interventional prospective animal study.
  
  
  METHODS
  University research laboratory.
  
  
  METHODS
  Ten healthy, new-born piglets.
  
  
  METHODS
  Variations in FiO2 during conventional mechanical ventilation (CMV) followed by partial liquid ventilation (PLV) with two different filling volumes of PF 5080 (10 vs. 30 ml/kg).
  
  
  RESULTS
  Arterial blood gases were obtained 15 min after changing FiO2 and concentrations of cerebral oxygenated and total hemoglobin were determined with near infrared spectroscopy. During CMV an increase in FiO2 1.0 was associated with a constant rise in PaO2 but only a small increase in the cerebral concentration of oxygenated Hb. Initiation of PLV (at FiO2 of 1.0) caused a rapid drop in PaO2 towards values that were similar to CMV at FiO2 of 0.5. At FiO2 of 0.5 a reduction in oxygenated Hb was found in the 30 ml/kg filling group. Complete filling of the lungs with PFC caused a significant drop in total cerebral Hb concentration. CONCLUSIONS. According to our data, PLV in healthy lungs should be performed with a FiO2 of 1.0 and a small filling volume to avoid deterioration in cerebral oxygen supply.
authors.affiliation: Clinic of Neonatology, Charité-Mitte, Schumannstrasse 20, 10098, Berlin, Germany.
authors.forename: Wolfram
authors.initials: W
authors.lastname: Burkhardt
authors.affiliation: Clinic of Neonatology, Charité-Mitte, Schumannstrasse 20, 10098, Berlin, Germany.
authors.forename: Hans
authors.initials: H
authors.lastname: Proquitté
authors.affiliation: Clinic of Neonatology, Charité-Mitte, Schumannstrasse 20, 10098, Berlin, Germany.
authors.forename: Susann
authors.initials: S
authors.lastname: Krause
authors.affiliation: Clinic of Neonatology, Charité-Mitte, Schumannstrasse 20, 10098, Berlin, Germany.
authors.forename: Roland R
authors.initials: RR
authors.lastname: Wauer
authors.affiliation: Clinic of Neonatology, Charité-Mitte, Schumannstrasse 20, 10098, Berlin, Germany. mario.ruediger@charite.de.
authors.forename: Mario
authors.initials: M
authors.lastname: Rüdiger
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001784:Blood Gas Analysis; D001921:Brain / Q000378:metabolism*; D005466:Fluorocarbons; D021061:Liquid Ventilation; D010108:Oxyhemoglobins / Q000737:chemistry / Q000378:metabolism*; D011446:Prospective Studies; D011659:Pulmonary Gas Exchange; D011897:Random Allocation; D013552:Swine
chemical_list: D005466:Fluorocarbons; D010108:Oxyhemoglobins