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논문 기본 정보

자료유형
학술저널
저자정보
이창호 (아주대학교 의과대학 진단방사선과학교실)
저널정보
대한영상의학회 대한방사선의학회지 대한방사선의학회지 제37권 제5호
발행연도
1997.1
수록면
845 - 851 (7page)

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Purpose : To compare the CT emphysema score with various factors of pulmonary function test by simplespirometry and to use the result as a predictor of pneumothorax in percutaneous transthoracic fine needleaspiration biopsy Materials and Methods : The CT scans of 106 patients who had undergone percutaneoustransthoracic fine needle aspiration biopsy of lung lesions within the previous 18 months were retrospectivelyreviewed. In 75 of these 106 cases, the results of the pulmonary function test were also reviewed. On plain chestradiography, pneumothorax was noted in 20 cases (19%). Emphysema was blindly evaluated. We divided each lung intofour segments and determined the severity and involved volume of emphysema, as seen on CT. Sseverity wasclassified as one of four grades, as follow: absence of emphysema=0;low attenuation area of less than 5mm=1;lowattenuation area of more than 5mm, and vascular pruning with normal lung intervening=2;and diffuse low attenuationwithout intervening normal lung, and larger confluent low attenuation with vascular pruning and distortion ofbranching pattern occupying all or almost all the involved parenchyma=3. The involved area was also classified asone of four grades:less than 25%=1;25-49%=2;51-74%=3; and more than 75%=4. The CT emphysema score was defined asthe average of the grade of severity multiplied by the grade of involved area. Pulmonary function tests, consisting of simple spirometry and a pulmonologist's interpretation, were evaluated. We also evaluated depth andsize of lesion as known predisposing factors in postbioptic pneumothorax. Statistical analysis was performed usingthe chi-square test, Wilcoxon ranks sum W test and the student t test. Results : A comparision between the twogroups of occurrence(with or without pneumothorax) showed the emphysema scores to be 1.69$\pm$2.0 and 1.11$\pm$2.9, respectively; there was thus no significnt difference between the two groups (Z=-0.048, p>0.10). Nor weredifferences revealed by the pulmonary function test;the scores were 2.45$\pm$1.2 versus 2.23$\pm$0.8 in FEV1, and73.4$\pm$14 versus 78.8$\pm$13 in FEV1/FVC. In the group with pneumonthorax, the lesion was significantly deeper, however, (1.92$\pm$1.6 cm versus 0.75$\pm$1.0cm;Z=-3.50, p<0.01) and the lesion was significantly smaller (3.37$\pm$1.7cmversus 4.20$\pm$2.0cm;Z=-1.86, p<0.10). In the pneumothorax group, the CT emphysema score was also significantlyhigher (1.94$\pm$3.9 versus 0.39$\pm$1.8;Z=-1.513, p<0.10) Conclusions : For the prediction of pneumothorax inpercutaneous transthoracic fine needle aspiration biopsy, the CT emphysema score is more useful than the pulmonaryfunction test.

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