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Ventilatory characteristics in mechanically ventilated patients during manual hyperventilation for chest physiotherapy
Author(s) -
Clarke R. C. N.,
Kelly B. E.,
Convery P. N.,
Fee J. P. H.
Publication year - 1999
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1046/j.1365-2044.1999.01007.x
Subject(s) - hyperventilation , medicine , tidal volume , anesthesia , lung volumes , ventilation (architecture) , peak inspiratory pressure , chest physiotherapy , lung , respiratory system , mechanical engineering , engineering
We measured the tidal volumes and peak inflation pressures generated during manual hyperventilation for chest physiotherapy in 25 adult ventilated patients. The average tidal volume ranged from 711 to 1511 ml, with a mean (SD) of 1120 (274) ml. There was a negative correlation (p < 0.05) between the average tidal volume and the lung injury, as measured by the Murray lung injury score. The average peak inflation pressure ranged from 37 to 74 cmH 2 O with a mean (SD) of 51.5 (7.6) cmH 2 O. There was a positive correlation (p < 0.05) between average peak inflation pressure and the lung injury score. Mean (SD) P a o 2 improved by 18.3 (14.3) kPa from baseline after physiotherapy (p < 0.05). Mean (SD) P a co 2 decreased by 0.1 (0.4) kPa. As the lung score increases higher inflation pressures and smaller tidal volumes are used suggesting an increased potential for barotrauma or volutrauma in susceptible lungs.