Department of Cardiology, Scripps Mercy Hospital, San Diego, CA 92103, USA.
Am J Emerg Med. 2010 Feb;28(2):203-7. doi: 10.1016/j.ajem.2008.10.006.
This study evaluated a simple ultrasound method to detect left atrial (LA) enlargement by comparing the diameters of the LA and aortic root.
The LA and aortic diameters, the LA volume index (LAVI), and significant echo findings were analyzed in 101 consecutive echocardiograms. Mean LAVI and the prevalence of an abnormal echo were compared between groups in which the ratio of the LA diameter to aortic diameter in diastole was >1 vs < or = 1.
Left atrial-to-aortic diameter ratio increased with LAVI (r = 0.64, P < .001). Left atrial-to-aortic diameter ratio >1 vs < or = 1 was noted in 45% vs 55% of patients and had a mean (+ or - SD) LAVI = 39 + or - 12 vs 27 + or - 7 mL/m(2) (P < .001) and a 78% vs 43% prevalence of an abnormal echo (P < .001).
The left atrium-to-aorta diastolic diameter ratio can detect LA enlargement and may be useful as a quick bedside technique to screen for cardiac disease.
本研究通过比较左心房（LA）和主动脉根部直径，评估一种简单的超声方法来检测左心房增大。
对 101 例连续超声心动图进行 LA 和主动脉直径、LA 容积指数（LAVI）和显著超声表现分析。在舒张期 LA 直径与主动脉直径之比>1 与≤1 的两组之间比较平均 LAVI 和异常超声的发生率。
LA 与主动脉直径比随 LAVI 增加（r = 0.64，P<.001）。45%的患者 LA 与主动脉直径比>1，55%的患者 LA 与主动脉直径比≤1，平均 LAVI 分别为 39+/-12 和 27+/-7 mL/m²（P<.001），异常超声的发生率分别为 78%和 43%（P<.001）。
LA 与主动脉舒张期直径比可以检测 LA 增大，可能是一种快速床边筛查心脏疾病的有用技术。
