Purpose
Atrial Fibrillation (AF) : common cardiac arrhythmia which increases with age •AF : contraindication for CCTA due to increased heart rate variation with severe motion artifacts
•To evaluate feasability of Coronary CT Angiography (CCTA) in patients with Atrial Fibrillation (AF) using new generation 256 MDCT •Number of analyzable segments •Image quality •Irradiation •In comparaison with 64 MDCT
Methods and Materials
•Retrospective study including 2 groups of 50 patients with AF •underwent cardiac CT: to evaluate pulmonary veins diameters •Evaluate number of the analysable coronary segments in each groupe •To compare : irradiation dose,
image quality : Contrast to noise ratio (CNR) and signal to noise ratio (SNR) and volume of contrast agent
Results
Population Characteristics
256 MDCT n=50
64 MDCT n= 50
P
Age (y)
67 ± 9
66 ± 9
ns
Sexe (M/F)
34/16
31 /19
BMI (kg/m²)
29 ± 6
28 ± 4
ns
Heart rate,
bpm
77
88
ns
Hypercholestrolemia,n
12
10
ns
Hypertension,
n
15
13
ns
Diabetus,
n
12
16
ns
•89% coronary segments (532/587) were analyzable with 256 MDCT vs 35% (211/603) with 64 MDCT,
P<0.0001 •Significant decrease radiation dose :256MDCT : 237±91 vs 739 ±459 mGy.cm,
P<0.001 •Contrast injection : 50...
Conclusion
•CCTA is feasible in AF patients using a new generation 256-MDCT •Improvement of Coronary segments analysis •Providing good image quality •Low radiation dose in this challenging population