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Title

Crackle-sound recording to monitor airway closure and recruitment in ventilated pigs

Authors
Tolnai, J
Hantos, Z
Published in The European Respiratory Journal. 2006, vol. 27, no. 4, p. 808-16
Abstract It was hypothesised that the recruitment of atelectatic lung areas is signified by changes in the airway and tissue mechanics, and by the appearance of crackle activity attributed to the sudden reopening of collapsed airways. The authors also assumed that the acoustic activity is an earlier indicator of lung recruitment than the change in the overall mechanical state of the lungs. Six thoracotomised and mechanically ventilated mini-pigs were studied. Low-frequency pulmonary impedance was measured at end-expiratory pauses at transpulmonary pressures of 4 and 1 hPa to estimate airway resistance (Raw) and the coefficient of lung tissue elastance (H), and tracheal sounds were recorded during subsequent slow inflations to 30 hPa, in the control state and following increasing doses of i.v. methacholine (Mch). Raw and H were higher at baseline and increased more in response to Mch at 1 hPa than at 4 hPa. The crackles detected during the subsequent inflations were concentrated around and associated with the development of the lower knee of the pressure-volume curve. The number of crackles increased faster following the Mch doses and reached statistical significance earlier than Raw and H. Crackle recording during mechanical ventilation can be employed as a simple method with which to monitor lung recruitment-derecruitment.
Keywords Airway Obstruction/physiopathologyAirway Resistance/physiologyAnimalsBronchi/physiopathologyBronchial Provocation TestsDose-Response Relationship, DrugElectric ImpedanceLung/physiopathologyLung Compliance/physiologyMethacholine ChlorideModels, AnimalPositive-Pressure RespirationPulmonary Atelectasis/physiopathologyRespiratory Mechanics/physiologyRespiratory Sounds/physiopathologySound SpectrographySwineSwine, MiniatureTrachea/physiopathology
Identifiers
PMID: 16585089
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Article (Published version) (395 Kb) - public document Free access
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Research group Enfants et hyperréactivité bronchique (69)
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(ISO format)
PETAK, Ferenc et al. Crackle-sound recording to monitor airway closure and recruitment in ventilated pigs. In: European Respiratory Journal, 2006, vol. 27, n° 4, p. 808-16. https://archive-ouverte.unige.ch/unige:46935

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Deposited on : 2015-02-19

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