Update 1987 pp 192-198 | Cite as

Dynamic Hyperinflation: Intrinsic PEEP and Its Ramifications in Patients with Respiratory Failure

  • J. Milic-Emili
  • S. B. Gottfried
  • A. Rossi
Part of the Update in Intensive Care and Emergency Medicine book series (UICM, volume 3)

Abstract

Pulmonary hyperinflation, which is defined as a consistent increase in the end-expiratory lung volume above the predicted functional residual capacity (FRC), is a characteristic abnormality in patients with acute or chronic airways obstruction [1]. While this may be the result of increased lung compliance (e.g. pulmonary emphysema), dynamic factors may also be responsible. For example, when there is a significant increase in airway resistance, the rate of lung emptying is unduly slowed and, by necessity, is interrupted by the next inspiratory effort. When the breathing frequency increases, as with exercise or increased ventilatory demands for other reasons, the expiratory time shortens and hence the end-expiratory lung volume may increase above the relaxed FRC position (elastic equilibrium volume), i.e. hyperinflation ensues. This process is referred to as dynamic hyperinflation. Expiratory flow may also be retarded by other mechanisms which contribute to the development of dynamic hyperinflation. These include activity of the inspiratory muscles during expiration (post-inspiration inspiratory activity) as well as activation of laryngeal adductor muscles with expiratory narrowing of the glottic aperture [10, 21, 24, 25].

Keywords

Fatigue Respiration Adductor Muscle Halothane Kelly 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • J. Milic-Emili
  • S. B. Gottfried
  • A. Rossi

There are no affiliations available

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