Assessment of regional lung recruitment and derecruitment during a PEEP trial based on electrical impedance tomography

  • Meier T
  • Luepschen H
  • Karsten J
 et al. 
  • 77

    Readers

    Mendeley users who have this article in their library.
  • 117

    Citations

    Citations of this article.

Abstract

OBJECTIVE: To investigate whether electrical impedance tomography (EIT) is capable of monitoring regional lung recruitment and lung collapse during a positive end-expiratory pressure (PEEP) trial. DESIGN: Experimental animal study of acute lung injury. SUBJECT: Six pigs with saline-lavage-induced acute lung injury. INTERVENTIONS: An incremental and decremental PEEP trial at ten pressure levels was performed. Ventilatory, gas exchange, and hemodynamic parameters were automatically recorded. EIT and computed tomography (CT) scans of the same slice were simultaneously taken at each PEEP level. MEASUREMENTS AND RESULTS: A significant correlation between EIT and CT analyses of end-expiratory gas volumes (r=0.98 up to 0.99) and tidal volumes (r=0.55 up to r=0.88) could be demonstrated. Changes in global and regional tidal volumes and arterial oxygenation (PaO2/FiO2) demonstrated recruitment/derecruitment during the trial, but at different onsets. During the decremental trial, derecruitment first occurred in dependent lung areas. This was indicated by lowered regional tidal volumes measured in this area and by a decrease of PaO2/FiO2. At the same time, the global tidal volume still continued to increase, because the increase of ventilation of the non-dependent areas was higher than the loss in the dependent areas. This indicates that opposing regional changes might cancel each other out when combined in a global parameter. CONCLUSIONS: EIT is suitable for monitoring the dynamic effects of PEEP variations on the regional change of tidal volume. It is superior to global ventilation parameters in assessing the beginning of alveolar recruitment and lung collapse.

Author-supplied keywords

  • Acute lung injury
  • Computed tomography
  • Electrical impedance tomography
  • Lung recruitment
  • Positive end-expiratory pressure

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Torsten Meier

  • Henning Luepschen

  • Jan Karsten

  • Thorsten Leibecke

  • Martin Großherr

  • Hartmut Gehring

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free