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- Title
Closing volume: a reappraisal (1967-2007).
- Authors
Milic-Emili, Joseph; Torchio, Roberto; D'Angelo, Edgardo
- Abstract
Measurement of closing volume (CV) allows detection of presence or absence of tidal airway closure, i.e. cyclic opening and closure of peripheral airways with concurrent (1) inhomogeneity of distribution of ventilation and impaired gas exchange; and (2) risk of peripheral airway injury. Tidal airway closure, which can occur when the CV exceeds the end-expiratory lung volume (EELV), is commonly observed in diseases characterised by increased CV (e.g. chronic obstructive pulmonary disease, asthma) and/or decreased EELV (e.g. obesity, chronic heart failure). Risk of tidal airway closure is enhanced by ageing. In patients with tidal airway closure (CV > EELV) there is not only impairment of pulmonary gas exchange, but also peripheral airway disease due to injury of the peripheral airways. In view of this, the causes and consequences of tidal airway closure are reviewed, and further studies are suggested. In addition, assessment of the "open volume", as opposed to the "closing volume", is proposed because it is easier to perform and it requires less equipment.
- Subjects
RESPIRATION; AIRWAY (Anatomy); RESPIRATORY obstructions; VENTILATION-perfusion ratio; RESPIRATORY diseases; OBSTRUCTIVE lung diseases; LUNG physiology; RESPIRATORY organ injuries; ANIMALS; RESPIRATORY measurements; LUNG volume measurements
- Publication
European Journal of Applied Physiology, 2007, Vol 99, Issue 6, p567
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-006-0389-0