Abstract 669: Assessment of the Anatomic Regurgitant Orifice in Aortic Regurgitation by Real-time 3-dimensional Transesophageal Echocardiography
Background: Effective regurgitant orifice (ERO) that can be measured by echocardiography is an important quantitative index to evaluate the severity of aortic regurgitation. However, the measurement of ERO is complex and time-consuming and it needs experienced echocardiographer. Recently, real-time three-dimensional transesophageal echocardiography (RT3DTEE) has been developed which allows us to measure aortic anatomical regurgitant orifice (ARO) directly. Thus, the aim of this study was to validate accuracy of ARO by RT3DTEE compared with ERO.
Method: We enrolled 118 consecutive patients with aortic regurgitation (86 men, mean age 61+/−15 years). We recorded three-dimensional datasets around aortic valve and measured ARO in all participants using iE33 and QLAB (Philips Medical System). ARO was measured by planimetry in optimally aligned two-dimensional cross-section from three-dimensional dataset. ERO was measured by conventional two-dimensional transthoracic echocardiography.
Results: Excluded 11 patients with severe calcification and 26 patients with bicuspid aortic valve, we analyzed the data from residual 81 patients. As shown in the figure⇓, an excellent correlation was obtained between ARO and ERO (y=0.90 +/− 0.016, r=0.89, P<0.0001, mean difference = 0.0008+/−0.045).
Conclusion: ARO is a simple and quick index for noninvasive evaluation of aortic regurgitation that can be easily measured by RT3DTEE.