Document Detail


Maximal hysteresis: a new method to set positive end-expiratory pressure in acute lung injury?
MedLine Citation:
PMID:  18419718     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: No methods are superior when setting positive end-expiratory pressure (PEEP) in acute lung injury (ALI). In ALI, the vertical distance (hysteresis) between the inspiratory and expiratory limbs of a static pressure-volume (PV) loop mainly indicates lung recruitment. We hypothesized that PEEP set at the pressure where hysteresis is 90% of its maximum (90%MH) would give similar oxygenation, but less cardiovascular depression than PEEP set at the pressure at lower inflection point (LIP) on the inspiratory limb or at the point of maximal curvature (PMC) on the expiratory limb in ALI. METHODS: In 12 mechanically ventilated pigs, ALI was induced in a randomized fashion by lung lavage, lung lavage plus injurious ventilation, or by oleic acid. From a static PV loop obtained by an interrupted low-flow method, the pressures at LIP [25 (25, 25) cmH(2)O, mean and 25, 75 percentiles], at PMC [24 (20, 24) cmH(2)O], and at 90% MH [19 (18, 19) cmH(2)O] were determined and used for the PEEP-settings. We measured lung inflation (by computed tomography), end-expiratory lung volume (EELV), airway pressures, compliance of the respiratory system (Crs), blood gases, cardiac output and arterial blood pressure. RESULTS: There were no differences between the PEEP settings in EELV or oxygenation, but the 90%MH setting gave lower end-inspiratory pause pressure (P<0.025), higher Crs (P<0.025), less hyper-aeration (P<0.025) and better maintained hemodynamics. CONCLUSION: In this porcine lung injury model, PEEP set at 90% MH gave better lung mechanics and hemodynamics, than PEEP set at PMC or LIP.
Authors:
J Koefoed-Nielsen; G Andersen; A Barklin; A Bach; S Lunde; E Tønnesen; A Larsson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  52     ISSN:  1399-6576     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-04-18     Completed Date:  2008-06-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  England    
Other Details:
Languages:  eng     Pagination:  641-9     Citation Subset:  IM    
Affiliation:
Clinical Institute, Aarhus University Hospital, Skejby, Denmark. koefoed-nielsen@ki.au.dk
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure / physiology
Cardiac Output / physiology
Positive-Pressure Respiration / methods*
Random Allocation
Respiratory Distress Syndrome, Adult / chemically induced,  pathology,  therapy*
Respiratory Function Tests / statistics & numerical data
Swine
Tomography, X-Ray Computed
Treatment Outcome

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