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논문 기본 정보

자료유형
학술저널
저자정보
최규옥 (연세대학교 의과대학 방사선과학교실)
저널정보
대한영상의학회 대한방사선의학회지 대한방사선의학회지 제11권 제3호
발행연도
1975.1
수록면
201 - 209 (9page)

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It is generally accepted that the plain chest roentgenogram is useful in evaluating the status of pulmonary circulation. But it is conflicting concerning the accuracy of this method for estimating pulmonary blood flow, resistance and pressure. Most studies have been performed in mitral stenosis. However, our present study deals with 97 cases of congenital heart disease with left to right shunt including 22 cases of ASD, 48 cases of VSD and 32 cases of PDA. To determine the accuracy of roentgenologic evaluation of hemodynamic status and localization fo shunt level, the findings of plain chest film are compared with the datas of cardiac catheterization in each case of congenitel heart disease. The results are summarized as follows; 1. When the pulmonary vascular resistance is normal, there is relative correlation between the degree of pulmonary plethora and actual shunt volume, but not well-correlated quantitatively. The degree of correlation is different depending on the diseas entity; with the same volume of shunt the pulmonary plethora is most prominent in VSD, and is least in ASD. The pulmonary plethora itself does not give to assist in determining the location of shunt. 2. when pulmonary vascular resistance is increased, the degree of pulmonary plethora is not correlated at all to the shunt volume. The presence of centralization of pulmonary vascularity in plain chest is a good index of increased pulmonary vascular resistance. Centralization is present in all cases whose pulmonary vascular pattern is detectable in 13 cases among 32 cases of the subjects having increased pulmonary vascular resistance in this study. The detection rate is not apparently different depending on disease entities. This poor result is a big barrier in this study; the cases having increased pulmonary vascular resistance constitutes the major portion of the error in estimating hemodynamic change from the plain film, since the pulmonary plethora is not correlated to shunt volume. 3. Pulmonary arterial pressure is presumptively elevated when the centralization of the pulmonary vascular pattern is present, hewever, in the remainder the radiologic criteria of pressure determination cannot be found. 4. The cross-sectional area of right descending pulmonary artery corrected by body surface area is best correlated with pulmonary blood flow in ASD having within normal range of vascular resistance (Y=0.013X+0.332, r=0.76, p<0.02, X-cross-sectional area of RDPA/BSA, Y=Q'p/Q's). The subjects having increased pulmonary vascular resistance have the right descending pulmonary artery always larger in diameter than those who have not increased pulmonary vascular resistance in the corresponding shunt volume. In PDA the relation is also well correlated but not as well as in the relation in ASD (Y-0.22X+0.224, r=0.717, p<0.01). With increase of pulmonary valscular resistance, the size of the right descending pulmonary artery has no constant relation to those of normal pul onary vascular resistance. There is no statistically significant correlation in this relationship in subjects of VSD (Y=0.003X+1.390, r=0.17, p>0.1).

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