Mikami T, Kudo T, Hashimoto M, Sugawara T, Sakamoto S, Tanabe Y, Yasuda H
Department of Cardiovascular Medicine, Hokkaido University School of Medicine, Sapporo.
J Cardiol. 1988 Jun;18(2):395-402.
To evaluate the correlation of cardiothoracic ratios (CTR) on chest radiography with the sizes of the four cardiac chambers, we studied 41 normal persons and 77 cardiac patients using two-dimensional echocardiography (2DE). The transverse cardiac diameter and the CTR were ascertained from their chest radiographs. Using 2DE, each cardiac chamber was evaluated three-dimensionally, by measuring the short and long diameters of each left (LV) and right ventricle (RV), the diameter of the RV outflow, the anteroposterior, transverse, and long diameters of each left (LA) and right atrium (RA). These values were corrected using the square root of the body surface area. The correlation coefficient for the CTR was greatest in the long diameter of the LA (r = 0.84), and was greater in the atrial diameters (r greater than or equal to 0.71) than in the other diameters except for the transverse diameter of the RA (r less than or equal to 0.51). The contribution of each cardiac chamber to the transverse cardiac diameter was evaluated in 34 patients with cardiac enlargement by a method using the null hypothesis, which we originally designed. Consequently, the contribution of the LV to the CTR was definitely proven in two patients, that of RV in two, that of LA in 15 and that of RA in nine. These results indicated that the CTR is strongly influenced by enlargement of the LA.
为了评估胸部X线片上心胸比率（CTR）与四个心腔大小之间的相关性，我们使用二维超声心动图（2DE）对41名正常人及77名心脏病患者进行了研究。从胸部X线片上确定心脏横径和CTR。使用2DE，通过测量左心室（LV）和右心室（RV）各自的短径和长径、RV流出道直径、左心房（LA）和右心房（RA）各自的前后径、横径和长径，对每个心腔进行三维评估。这些值用体表面积的平方根进行校正。CTR的相关系数在LA长径中最大（r = 0.84），且在心房直径中（r≥0.71）比除RA横径外的其他直径（r≤0.51）更大。通过我们最初设计的使用零假设的方法，对34例心脏扩大患者评估了每个心腔对心脏横径的贡献。结果，明确证实LV对CTR有贡献的患者有2例，RV有2例，LA有15例，RA有9例。这些结果表明，CTR受LA扩大的强烈影响。
