Piers Lieuwe H, Dikkers Riksta, Tio René A, van den Berg Maarten P, Willems Tineke P, Zijlstra Felix, Oudkerk Matthijs
Department of Cardiology, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, P.O. Box 30001, Groningen, 9700 RB, The Netherlands.
Int J Cardiovasc Imaging. 2007 Dec;23(6):781-8. doi: 10.1007/s10554-007-9208-x. Epub 2007 Feb 7.
The purpose of this study was to compare electron beam computed tomography (EBT) with transthoracic echocardiography (TTE) in determining aortic valve area (AVA). Thirty patients (9 females, 21 males) underwent a contrast-enhanced EBT scan (e-Speed, GE, San Francisco, CA, USA) and TTE within 17 +/- 12 days. In end-inspiratory breath hold, a prospectively ecg-triggered scan was acquired with a beam speed of 50-100 ms, a collimation of 2 x 1.5 mm and an increment of 3.0 mm. The AVA was measured with planimetry. A complete TTE study was performed in all patients, and the AVA was computed using the continuity equation. There was close correlation between AVA measured with EBT and AVA assessed with TTE (r = 0.60, P < 0.01). The AVA measured with EBT was 0.51 +/- 0.46 cm(2 )larger than the AVA calculated with TTE measurements. EBT appeared to be a valuable non-invasive method to measure the AVA. EBT measures the anatomical AVA, while with TTE the functional AVA is calculated, which explains the difference in results between the methods.
本研究的目的是比较电子束计算机断层扫描（EBT）与经胸超声心动图（TTE）在测定主动脉瓣面积（AVA）方面的差异。30例患者（9例女性，21例男性）在17±12天内接受了对比增强EBT扫描（e-Speed，GE，美国加利福尼亚州旧金山）和TTE检查。在吸气末屏气状态下，采用前瞻性心电图触发扫描，束流速度为50 - 100毫秒，准直为2×1.5毫米，增量为3.0毫米。通过平面测量法测量AVA。所有患者均进行了完整的TTE检查，并使用连续性方程计算AVA。EBT测量的AVA与TTE评估的AVA之间存在密切相关性（r = 0.60，P < 0.01）。EBT测量的AVA比TTE测量计算出的AVA大0.51±0.46平方厘米。EBT似乎是一种测量AVA的有价值的非侵入性方法。EBT测量的是解剖学上的AVA，而TTE计算的是功能性AVA，这解释了两种方法结果的差异。
