IJCS | Volume 32, Nº5, September/October 2019

463 Figure 2 - C and D: Example of thrombogenic left atrial appendage (similar to windsock, cactus and cauliflower by nuclear magnetic resonance imaging), there is no prominent angulation of the structure with its irregular internal surface. Figure 3 - Delineation of the left atrial appendage contour following the scheme proposed by Di Biase through computed tomography and magnetic resonance imaging. Chicken wing Windsock Cauliflower Cactus LA LA LA LA LV LV LV LAA LAA LAA LAA Non-thrombogenic profile Thrombogenic profile Linhares et al. Transesophageal echocardiography and CHA2DS2-Vasc score Int J Cardiovasc Sci. 2019;32(5):460-470 Original Article Group 1 patients (CHA 2 DS 2 -VASc - entre 0 e 1) presented the lowest percentages of AF (8.7%), spontaneous contrast (8.7%), left atrium dilation (14.0%) and of heart failure (2.0%) compared to other groups. In addition, this group had the highest percentages of ejection fraction higher than 55% (96.0%), and LAAmean flow velocity higher than 0.4 m/s (95.3%) (table 1). Patients in group 2 (CHA 2 DS 2 -VASc - between 2 and 3) had the highest percentages of spontaneous contrast (26.7%), mild left atrial dilation (22.7%), presence of