Shinjiro Miyawaki1, Eric A Hoffman2, Sally E Wenzel3, Ching-Long Lin4. 1. IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, USA; Currently at CH2M, 1100 NE Circle Blvd., Suite 300, Corvallis, OR 97330, USA. 2. Department of Biomedical Engineering, The University of Iowa, Iowa City, IA 52242, USA; Department of Medicine, The University of Iowa, Iowa City, IA 52242, USA; Department of Radiology, The University of Iowa, Iowa City, IA 52242, USA. 3. Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA. 4. IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, USA; Department of Radiology, The University of Iowa, Iowa City, IA 52242, USA; Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242, USA. Electronic address: ching-long-lin@uiowa.edu.
Abstract
BACKGROUND: The authors numerically investigated the correlation between airway skeletons of severe asthmatic human subjects and predicted aerosol deposition to shed light on the effect of environmental factors on asthma risk. We hypothesized that there are asthmatic subjects whose airway skeletal structure can expose the subject to a risk of higher local aerosol deposition compared to subjects with a more common/normal branching pattern. METHODS: From a population of severe asthmatics studied at total lung capacity via computed tomography we randomly selected 8 subjects whose Forced Expiratory Volume in 1s, percent predicted fell below 45% predicted. To simulate aerosol motion in the human lungs, we employed in-house three-dimensional eddy-resolving computational fluid dynamics and particle tracking models utilizing 3 of the 8 severe asthmatic subjects. One of the 3 subjects was found to have a distinct, localized airway narrowing chosen for further investigation. In the simulation, we controlled flow rate and luminal area, i.e., Reynolds and Stokes numbers, in each branch of the computed tomography-derived airway skeletons. FINDINGS: We found a distinct enhancement of aerosol deposition associated with the narrowed branches of one subject even when the luminal area was numerically adjusted from its narrowed state to that of a non-asthmatic subject. The branching angle, freed of luminal narrowing persisted in demonstrating a marginally significant increase in local particle deposition compared with the subjects without the initial constriction. INTERPRETATION: These results demonstrate the possibility that inherent airway structure may influence localized constriction found in severe asthmatics.
BACKGROUND: The authors numerically investigated the correlation between airway skeletons of severe asthmatic human subjects and predicted aerosol deposition to shed light on the effect of environmental factors on asthma risk. We hypothesized that there are asthmatic subjects whose airway skeletal structure can expose the subject to a risk of higher local aerosol deposition compared to subjects with a more common/normal branching pattern. METHODS: From a population of severe asthmatics studied at total lung capacity via computed tomography we randomly selected 8 subjects whose Forced Expiratory Volume in 1s, percent predicted fell below 45% predicted. To simulate aerosol motion in the human lungs, we employed in-house three-dimensional eddy-resolving computational fluid dynamics and particle tracking models utilizing 3 of the 8 severe asthmatic subjects. One of the 3 subjects was found to have a distinct, localized airway narrowing chosen for further investigation. In the simulation, we controlled flow rate and luminal area, i.e., Reynolds and Stokes numbers, in each branch of the computed tomography-derived airway skeletons. FINDINGS: We found a distinct enhancement of aerosol deposition associated with the narrowed branches of one subject even when the luminal area was numerically adjusted from its narrowed state to that of a non-asthmatic subject. The branching angle, freed of luminal narrowing persisted in demonstrating a marginally significant increase in local particle deposition compared with the subjects without the initial constriction. INTERPRETATION: These results demonstrate the possibility that inherent airway structure may influence localized constriction found in severe asthmatics.
Authors: Michel Montaudon; Mathieu Lederlin; Stéphanie Reich; Hugues Begueret; José Manuel Tunon-de-Lara; Roger Marthan; Patrick Berger; François Laurent Journal: Radiology Date: 2009-09-29 Impact factor: 11.105