Document Detail

Interactions of regional respiratory mechanics and pulmonary ventilatory impairment in pulmonary emphysema: assessment with dynamic MRI and xenon-133 single-photon emission CT.
MedLine Citation:
PMID:  10858397     Owner:  NLM     Status:  MEDLINE    
STUDY OBJECTIVES: Dynamic MRI and (133)Xe single-photon emission CT (SPECT) were used to directly evaluate the interaction of regional respiratory mechanics and lung ventilatory function in pulmonary emphysema. METHODS: Respiratory diaphragmatic and chest wall (D/CW) motions were analyzed by sequential MRI of fast-gradient echo pulse sequences during two to three respiratory cycles in 28 patients with pulmonary emphysema, including 9 patients undergoing lung volume reduction surgery (LVRS). The extent of air trapping in the regional lung was quantified by the (133)Xe retention index (RI) on three-dimensional (133)Xe SPECT displays. RESULTS: By contrast to healthy subjects (n = 6) with regular, synchronous D/CW motions, pulmonary emphysema patients showed reduced, irregular, or asynchronous motions in the hemithorax or location with greater (133)Xe retention, with significant decreases in the maximal amplitude of D/CW motions (MADM and MACWM; p < 0.0001 and p < 0.05, respectively). The removal of (133)Xe retention sites by LVRS effectively and regionally improved D/CW motions in nine patients, with significant increases in MADM and MACWM (p < 0.01 and p < 0.001, respectively). In a total of 40 studies of the 28 patients including post-LVRS studies, normalized MADM and MACWM correlated with percent predicted FEV(1) (r = 0.881, p < 0.0001; and r = 0.906, p < 0.0001, respectively), and also with (133)Xe RI in each hemithorax (r = -0.871, p < 0 0.0001; and r = -0.901, p < 0 0.0001, respectively.) CONCLUSIONS: This direct comparison of regional respiratory mechanics with lung ventilation demonstrated a close interaction between these impairments in pulmonary emphysema. The present techniques provide additional sensitivity for evaluating pathophysiologic compromises in pulmonary emphysema, and may also be useful for selecting resection targets for LVRS and for monitoring the effects.
K Suga; T Tsukuda; H Awaya; N Matsunaga; K Sugi; K Esato
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chest     Volume:  117     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-07-17     Completed Date:  2000-07-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1646-55     Citation Subset:  AIM; IM    
Departments of Radiology, Yamaguchi University School of Medicine, Ube, Japan.
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MeSH Terms
Forced Expiratory Volume / physiology
Lung / physiopathology
Magnetic Resonance Imaging*
Middle Aged
Pulmonary Emphysema / diagnosis*,  physiopathology,  surgery
Respiratory Mechanics / physiology*
Tomography, Emission-Computed, Single-Photon*
Ventilation-Perfusion Ratio / physiology*
Xenon Radioisotopes / diagnostic use
Reg. No./Substance:
0/Xenon Radioisotopes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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