Influence of end-expiratory level and tidal volume on gravitational ventilation distribution during tidal breathing in healthy adults

Schnidrig, Silvia; Casaulta, Carmen; Schibler, Andreas; Riedel, Thomas (2013). Influence of end-expiratory level and tidal volume on gravitational ventilation distribution during tidal breathing in healthy adults. European journal of applied physiology, 113(3), pp. 591-598. Heidelberg: Springer-Verlag 10.1007/s00421-012-2469-7

[img]
Preview
Text
421_2012_Article_2469.pdf - Published Version
Available under License Publisher holds Copyright.

Download (386kB) | Preview

Our understanding of regional filling of the lung and regional ventilation distribution is based on studies using stepwise inhalation of radiolabelled tracer gases, magnetic resonance imaging and positron emission tomography. We aimed to investigate whether these differences in ventilation distribution at different end-expiratory levels (EELs) and tidal volumes (V (T)s) held also true during tidal breathing. Electrical impedance tomography (EIT) measurements were performed in ten healthy adults in the right lateral position. Five different EELs with four different V (T)s at each EEL were tested in random order, resulting in 19 combinations. There were no measurements for the combination of the highest EEL/highest V (T). EEL and V (T) were controlled by visual feedback based on airflow. The fraction of ventilation directed to different slices of the lung (VENT(RL1)-VENT(RL8)) and the rate of the regional filling of each slice versus the total lung were analysed. With increasing EEL but normal tidal volume, ventilation was preferentially distributed to the dependent lung and the filling of the right and left lung was more homogeneous. With increasing V (T) and maintained normal EEL (FRC), ventilation was preferentially distributed to the dependent lung and regional filling became more inhomogeneous (p < 0.05). We could demonstrate that regional and temporal ventilation distribution during tidal breathing was highly influenced by EEL and V (T).

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine

UniBE Contributor:

Casaulta Aebischer, Carmen; Casaulta, Carmen and Riedel, Thomas

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1439-6319

Publisher:

Springer-Verlag

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:40

Last Modified:

26 Apr 2022 10:26

Publisher DOI:

10.1007/s00421-012-2469-7

PubMed ID:

22872368

Web of Science ID:

000314773500005

BORIS DOI:

10.7892/boris.16517

URI:

https://boris.unibe.ch/id/eprint/16517 (FactScience: 224170)

Actions (login required)

Edit item Edit item
Provide Feedback