Journal of Applied Physiology Journal of Applied Physiology
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J Appl Physiol 73: 479-485, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 73, Issue 2 479-485, Copyright © 1992 by American Physiological Society

ARTICLES

Intrinsic PEEP monitored in the ventilated ARDS patient with a mathematical method

L. Eberhard, J. Guttmann, G. Wolff, W. Bertschmann, A. Minzer, H. J. Kohl, J. Zeravik, M. Adolph and J. Eckart
Clinic for Cardiac and Thoracic Surgery, Department of Surgery, Basel, Switzerland.

Under mechanical volume-controlled ventilation, the intensive care patient can develop intrinsic positive end-expiratory pressure (iPEEP); that is, the passive expiration is terminated by the following inspiration before the alveolar pressure comes to its physical equilibrium value. We present a mathematical method to estimate this alveolar dynamic iPEEP breath by breath, without the need of a maneuver. We tested it in paralyzed patients ventilated for adult respiratory distress syndrome after multiple trauma and/or sepsis, and we compared the results obtained with the new mathematical method with those from the occlusion method introduced by Pepe and Marini. The results agreed well (median difference of 0.8 mbar in 201 investigations in 12 patients). However, the mathematically determined values, representing dynamic iPEEP, are systematically slightly smaller than those measured by the occlusion maneuver. A variation of expiratory time suggests that this difference might be due to mechanical time-constant inhomogeneity, viscoelastic processes, or other mechanisms showing time dependence.


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