Gas Washout and Aerosol Bolus Techniques: Non-invasive Measures of Lung Structure and Ventilation Heterogeneity

Verbanck, Sylvia; Paiva, Manuel

doi:10.1007/978-88-470-2916-3_11

Cited by 2 publications

(1 citation statement)

References 48 publications

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“…Adapted from Dollfuss et al (1967) in the single breath expirate. It was concluded that even in the normal lung the ventilation distribution is not uniform, due to many potential mechanisms (Bouhuys 1964;Verbanck and Paiva 2002).…”

Section: Genesis Of Phases III and Ivmentioning

confidence: 97%

Closing volume: a reappraisal (1967–2007)

2007

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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.

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Section: Genesis Of Phases III and Ivmentioning

confidence: 97%