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KMID : 0371019960290030471
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Journal of Preventive Medicine and Public Health
1996 Volume.29 No. 3 p.471 ~ p.482
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The Diagnostic Role of HRCT in Simple Pneumoconiosis
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Kim Kyoung-A
Kim Ji-Hong
Chang Hwang-Shin
Ahn Hyeong-Sook
Lim Young
Yun Im-Goung
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Abstract
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Early recognition of coalescence in pneumoconiotic lessons is important because such coalescence is associated with the respiratory symptoms and deterioration of lung function. This complicated form of pneumoconiosis also has worse prognosis than does simple pneumoconiosis. High resolution computerized tomography(HRCT) provides significant additional information on the stage of the pneumoconiosis because it easily detects coalescence of ´nodules and emphysema that may not be apparent on the simple radiograph. The purpose of this study is to clarify the role of HRCT in detection of large opacity and the relationship of change between the coalescence of nodules or emphysema and lung function in dust exposed workers.
1. There was good correlation between the HRCT grade of pneumoconiosis and ILO category of profusion. 5(9.09%) in 55 study population had confluent nodule extending over two or more cuts on HRCT. HRC I´ could identify the pneumoconiotic nodules which was not found by simple radiography in 6 workers with category 0/0.
2. No significant difference was observed coalescence of nodules and emphysema by dust type.
3. There was no significant difference in pulmonary function according to ILO and HRCT classification.
4. HRCT could detect the significant reduction in FEV1, FEV1/FVC, PEFR, FEE25, FEE50, and FEF75 and remarkable increase in RV and TLC in study persons with emphysema compared with non-emphysema group.
5. Emphysema was fund more often in nodules-coalescence group thin small opacity group by HRCTWe found that HRCT could easily detect areas of coalescence and complicated emphysema compared to plain chest X-ray. Also our data suggest that it is primarily the degree of
emphysema rather than the degree of pneumoconiosis that determines the level of pulmonary function.
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KEYWORD
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Simple pneumoconiosis, HRCT, nodule-coalescence, emphysema
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