Journal article
Changes in lung composition and regional perfusion and tissue distribution in patients with ARDS
Respirology (Carlton, Vic.), Vol.16(8), pp.1265-1272
11/2011
DOI: 10.1111/j.1440-1843.2011.02048.x
PMCID: PMC3204166
PMID: 21883676
Abstract
ARDS is characterized by bilateral pulmonary infiltrates and refractory hypoxemia attributed to V/Q mismatch. We used dynamic CT to characterize changes in lung composition, regional perfusion and tissue distribution in patients with ARDS in comparison with healthy subjects.
The Fick principle was applied to serial attenuation measurements constructed from sequential CT images acquired during the passage of a bolus of iodinated contrast medium in healthy subjects (n=3) and patients with ARDS (n=11). Perfusion was calculated by the Mullani-Gould method and mapped throughout both lungs. Gradients of perfusion and tissue density against vertical height were constructed.
In comparison with normal individuals, the tissue component of lungs from patients with ARDS was significantly increased (P<0.05). Blood fraction was unchanged. There was a discernable gradient in tissue density from non dependent to dependent regions in the patients with ARDS that was significantly different from controls. The proportion of perfusion applied to consolidated areas (i.e. shunt) correlated significantly (P<0.05) with the severity of hypoxaemia.
In patients with ARDS there are changes in both lung composition and the distribution of tissue and perfusion that may account in part for the physiological changes that define the syndrome.
Details
- Title: Subtitle
- Changes in lung composition and regional perfusion and tissue distribution in patients with ARDS
- Creators
- Jonathan Dakin - Imperial College Unit of Critical Care, National Heart and Lung Institute, Royal Brompton Hospital, London, UKAndrew T JonesDavid M HansellEric A HoffmanTimothy W Evans
- Resource Type
- Journal article
- Publication Details
- Respirology (Carlton, Vic.), Vol.16(8), pp.1265-1272
- DOI
- 10.1111/j.1440-1843.2011.02048.x
- PMID
- 21883676
- PMCID
- PMC3204166
- NLM abbreviation
- Respirology
- ISSN
- 1323-7799
- eISSN
- 1440-1843
- Publisher
- Australia
- Grant note
- HL-060158 / NHLBI NIH HHS R01-HL-064368 / NHLBI NIH HHS Department of Health R01 HL060158 / NHLBI NIH HHS R01 HL064368-01 / NHLBI NIH HHS R01 HL064368 / NHLBI NIH HHS
- Language
- English
- Date published
- 11/2011
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Internal Medicine
- Record Identifier
- 9984051991702771
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