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http://dx.doi.org/10.4046/trd.2009.66.4.288

The Correlation of Dyspnea and Radiologic Quantity in Patients with COPD  

Jung, Eun Jung (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Kim, Yang Ki (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Lee, Young Mok (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Kim, Ki-Up (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Uh, Soo-Taek (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Kim, Yong Hoon (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Kim, Do Jin (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Park, Choon Sik (Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine)
Hwang, Jung Hwa (Department of Radiology, Soonchunhyang University College of Medicine)
Publication Information
Tuberculosis and Respiratory Diseases / v.66, no.4, 2009 , pp. 288-294 More about this Journal
Abstract
Background: A lung hyperinflation, or air trapping, caused by expiratory flow-limitation contributes to dyspnea in patients with chronic obstructive pulmonary disease (COPD). Forced expiratory volume in 1 second ($FEV_1$) has served as an important diagnostic measurement of COPD, but does not correlate with patient-centered outcomes such as dyspnea. Therefore, this study was performed to investigate the role of radiologic quantity in evaluating the dyspnea in patients with COPD by measuring lung hyperinflation in chest x-ray and high resolution chest tomography (HRCT). Methods: Fifty patients with COPD were enrolled in this study. Their subjective dyspnea score (modified Borg scale dyspnea index), spirometry, and lung volume were measured. Simultaneous hyperinflations of chest x-ray score ("chest score") and degree of emphysema of HRCT ("HRCT score") were measured. The "chest score" were composed of lung length, retrosternal space width, and height of the arc of the diaphragm and "HRCT score" were composed of severity and extent of emphysema. Results: The mean age of patients was 69 years old and their mean $FEV_1$ was 51.7%. The Borg score significantly correlated with parameters of spirometry and lung volume, including FVC, $FEV_1$, $FEV_1$/FVC, RV, RV/TLC, and DLCO. The Borg score correlated well with "HRCT score", but did not correlate with "chest score". Also, the Borg scale correlates inversely with body mass index. Conclusion: The quantity of emphysema on chest HRCT may serve as an objective marker of dyspnea in patients with COPD.
Keywords
Dyspnea; Chronic obstructive pulmonary disease; Radiology;
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