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At the time the article was created Craig Hacking had no recorded disclosures.View Craig Hacking's current disclosures
At the time the article was last revised Henry Knipe had the following disclosures:
- Radiopaedia Events Pty Ltd, Speaker fees (past)
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to not be relevant to the changes that were made.View Henry Knipe's current disclosures
Gravity-dependent atelectasis occurs due to a combination of reduced alveolar volume and increased perfusion. Due to gravity, it usually has a dependent and subpleural distribution. It is very commonly seen in the posterior lung bases on CT, particularly in elderly individuals.
In normal lung, gravity gradients exist in end-inspiration between the apex and lung base of 4:1 in the erect patient and between the anterior and posterior lung of 2.5:1 in the supine patient 1. These gradients increase in the presence of lung disease that increases the weight of the lung causing atelectasis.
patients with prolonged shallow breathing
impaired mucociliary clearance
- 1. Woodring J & Reed J. Types and Mechanisms of Pulmonary Atelectasis. J Thorac Imaging. 1996;11(2):92-108. doi:10.1097/00005382-199621000-00002 - Pubmed
- 2. Kashiwabara K & Kohshi S. Additional Computed Tomography Scans in the Prone Position to Distinguish Early Interstitial Lung Disease from Dependent Density on Helical Computed Tomography Screening Patient Characteristics. Respirology. 2006;11(4):482-7. doi:10.1111/j.1440-1843.2006.00869.x - Pubmed