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Regional deposition and retention of particles in shallow, inhaled boluses: effect of lung volume.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bennett, William Drew Scheuch, Gerhard Zeman, Kirby L. Brown, James S. Kim, Christine Heyder, Joachim Stahlhofen, Willi |
| Copyright Year | 1999 |
| Abstract | The regional deposition of particles in boluses delivered to shallow lung depths and their subsequent retention in the airways may depend on the lung volume at which the boluses are delivered. To evaluate the effect of end-inspiratory lung volume on aerosol bolus delivery, we had healthy subjects inhale radiolabeled, monodisperse aerosol (99mTc-iron oxide, 3.5-microm mass median aerodynamic diameter) boluses (40 ml) to a volumetric front depth of 70 ml into the lung at lung volumes of 50, 70, and 85% of total lung capacity (TLC) end inhalation. By gamma camera analysis, we found significantly greater deposition in the left (L) vs. right (R) lungs at the 70 and 85% TLC end inhalation; ratio of deposition in L to R lung, normalized to L-to-R ratio of lung volume (mean L/R), was 1.60 +/- 0.45 (SD) and 1. 96 +/- 0.72, respectively (P < 0.001 for comparison to 1.0) for posterior images. However, at 50% TLC, L/R was 1.23 +/- 0.37, not significantly different from 1.0. These data suggest that the L and R lungs may be expanding nonuniformly at higher lung volumes. On the other hand, subsequent retention of deposited particles at 2 and 24 h postdeposition was independent of L/R at the various lung volumes. Thus asymmetric bolus ventilation for these very shallow boluses does not lead to significant increases in peripheral alveolar deposition. These data may prove useful for 1) designing aerosol delivery techniques to target bronchial airways and 2) understanding airway retention of inhaled particles. |
| Starting Page | 227 |
| Ending Page | 232 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://jap.physiology.org/content/jap/86/1/168.full.pdf |
| PubMed reference number | 9887127v1 |
| Volume Number | 86 |
| Issue Number | 1 |
| Journal | Journal of applied physiology |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Aerosol Dose Form Airway structure Capacity.total:Volume:Point in time:Respiratory system:Quantitative Diameter (qualifier value) Gamma Cameras Inspiration function Lung Capacities Respiration Structure of parenchyma of lung ferric oxide |
| Content Type | Text |
| Resource Type | Article |
