|ECR 2013 / C-0677|
|Aortic valve evaluation by 128-DSCT prior to TAVI: Optimal time interval for AVA sizing in comparison with echocardiography|
Among the 44 patients 32 Patients were in Sinus rhythm, the remaining 12 had atrial fibrillation. Mean heart rate was 73 bpm (range 49-101).
Phase of best correlation
For the best correlation between CT and TTE (AVAbestcorr; r=0.94, p=0.001), the most frequently chosen phase was 35% of the RR-interval. (11/44, 19%) as shown in Table1.
Phase of largest Aortic valve area
The largest AVA (AVAmax) was most likely to be found at 25% (17/44; 39%) of cardiac cycle in early to mid systole and far less often in late systole as shown in Table2.
The maximal AVA (AVA max) correlated significantly (r=0.64, p<0.001); with an overestimation of + 0.12 (limits of agreement: -0.09-0.33) by CT.
Image quality of the aortic valve was sufficient for diagnosis in all patients. It was most frequently excellent or good at 25%, 30% and 35% of RR-interval.
There was a relationship between phases offering excellent image quality and heart rate. For slow heart rates (<70bpm) image quality was most frequently excellent in early systole. In patients with fast heart rates (>80) image quality was more often excellent in late diastole. Peak prevalences of image quality graded as excellent was 15-25% for < 70 bpm, 20-30% for 70-80 bpm and 25—40% for >80 bpm.
Functional bicuspid valves were found in 9/44 (20%). (5NC/RC, 3LC/RC, 1 NC/LC). Two congenital bicuspid valves (both RC/LC, with calcified Raphe) were diagnosed.
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