Brian Casserly1,2, F Dennis McCool3, Jean Saunders4, Narendran Selvakumar5, Mitchell M Levy6. 1. Pulmonary, Critical Care, and Sleep Medicine, Mid-Western Regional Hospital, Dooradoyle, Limerick, Ireland. brian_casserly@brown.edu. 2. University Hospital Limerick, Dooradoyle, Limerick, Ireland. brian_casserly@brown.edu. 3. Division of Pulmonary, Critical Care and Sleep Medicine, The Memorial Hospital of Rhode Island, 111 Brewster Street, Pawtucket, RI, USA. 4. Director of Statistical Consulting Unit, University of Limerick, Limerick, Ireland. 5. University of Limerick, Limerick, Ireland. 6. Division of Pulmonary, Critical Care and Sleep Medicine, Rhode Island Hospital, 593 Eddy Street, Providence, RI, USA.
Abstract
INTRODUCTION: Changes in end-expiratory lung volume (∆EELV) in response to changes in PEEP (∆PEEP) have not been reported in mechanically ventilated patients with ARDS. The purpose of this study was to determine the utility of measurements of ∆EELV in determining optimal PEEP in ARDS patients. METHODS: Nine patients with ARDS were prospectively recruited. ∆EELV was measured using magnetometers during serial decremental PEEP trials. Changes in PaO2 (∆PaO2) were simultaneously measured. Static respiratory system compliance (CRS), ∆PaO2/∆PEEP, and ∆EELV/∆PEEP were calculated at each level of PEEP. RESULTS: For the group, ∆EELV decreased by 1.09 ± 0.13 L (mean ± SD) as PEEP was reduced from 20 to 0 cm H2O with the greatest changes in ∆EELV occurring over the mid range of the decremental PEEP curve. Optimal values for CRS, ∆EELV/∆PEEP, and ∆PaO2/∆PEEP could be identified for each patient and occurred at PEEP levels ranging from 10 to 17.5 cm H2O. There was a significant correlation (r = 0.712, p = 0.047) between ∆PaO2/∆PEEP and ∆EELV/∆PEEP. CONCLUSIONS: ∆EELV can be measured from a decremental PEEP curve. Since ∆EELV is highly correlated with ∆PaO2, measures of ∆PaO2/∆PEEP may provide a surrogate for measures of ∆EELV/∆PEEP. Combining measures of ∆EELV/∆PEEP with measures of CRS may provide a novel means of determining optimal PEEP in patients with ARDS.
INTRODUCTION: Changes in end-expiratory lung volume (∆EELV) in response to changes in PEEP (∆PEEP) have not been reported in mechanically ventilated patients with ARDS. The purpose of this study was to determine the utility of measurements of ∆EELV in determining optimal PEEP in ARDSpatients. METHODS: Nine patients with ARDS were prospectively recruited. ∆EELV was measured using magnetometers during serial decremental PEEP trials. Changes in PaO2 (∆PaO2) were simultaneously measured. Static respiratory system compliance (CRS), ∆PaO2/∆PEEP, and ∆EELV/∆PEEP were calculated at each level of PEEP. RESULTS: For the group, ∆EELV decreased by 1.09 ± 0.13 L (mean ± SD) as PEEP was reduced from 20 to 0 cm H2O with the greatest changes in ∆EELV occurring over the mid range of the decremental PEEP curve. Optimal values for CRS, ∆EELV/∆PEEP, and ∆PaO2/∆PEEP could be identified for each patient and occurred at PEEP levels ranging from 10 to 17.5 cm H2O. There was a significant correlation (r = 0.712, p = 0.047) between ∆PaO2/∆PEEP and ∆EELV/∆PEEP. CONCLUSIONS: ∆EELV can be measured from a decremental PEEP curve. Since ∆EELV is highly correlated with ∆PaO2, measures of ∆PaO2/∆PEEP may provide a surrogate for measures of ∆EELV/∆PEEP. Combining measures of ∆EELV/∆PEEP with measures of CRS may provide a novel means of determining optimal PEEP in patients with ARDS.
Authors: Fernando Suarez-Sipmann; Stephan H Böhm; Gerardo Tusman; Tanja Pesch; Oliver Thamm; Hajo Reissmann; Andreas Reske; Anders Magnusson; Göran Hedenstierna Journal: Crit Care Med Date: 2007-01 Impact factor: 7.598
Authors: Nicholas S Ward; Dennis Y Lin; David L Nelson; Jeane Houtchens; William A Schwartz; James R Klinger; Nicholas S Hill; Mitchell M Levy Journal: Crit Care Med Date: 2002-05 Impact factor: 7.598
Authors: V M Ranieri; P M Suter; C Tortorella; R De Tullio; J M Dayer; A Brienza; F Bruno; A S Slutsky Journal: JAMA Date: 1999-07-07 Impact factor: 56.272
Authors: V Marco Ranieri; Gordon D Rubenfeld; B Taylor Thompson; Niall D Ferguson; Ellen Caldwell; Eddy Fan; Luigi Camporota; Arthur S Slutsky Journal: JAMA Date: 2012-06-20 Impact factor: 56.272