Background: Because of its advantages over cardiac computed tomography (CT) echocardiography, cardiovascular magnetic resonance (CMR) has developed as an imaging technique for evaluating functional outcomes of cases who have undergone repaired tetralogy of Fallot (TOF). This study aimed to assess role of CMR in evaluating repaired tetralogy of Fallot cases.

Subject & Methods: In this observational study, we included 33 patients ranging from 2 to 51 years who had repaired Tetralogy of Fallot using a Philips 1.5 tesla MRI machine were referred to diagnostic radiology department at Zagazig University Hospitals. All cases underwent complete history taking, examination, 12 lead ECG, Echocardiography,CMR.

Results: Right ventricle Ejection fraction ranged from 22 to 66% with a mean of 50.88%. Fifteen patients (45.5%) had good systolic function; eleven patients (33.3%) had impaired systolic function, while seven patients (21.2%) had fair systolic function. Concerning pulmonary valve regurgitation, seventeen patients (51.5%) had a regurgitation factor>40%, which denoted severe regurgitation, and one-third had moderate regurgitation. As regards late gadolinium enhancement, six patients (18.2%) had no enhancement, 69.7% had RVOT enhancement, 54.5% had VSD patch region enhancement, 18.2% had RV insertion area enhancement, 15.2% had enhancement of RV septal surface except for VSD patch region. In contrast, 3% had enhancement in inferior wall of RV.

Conclusion: Evaluation of cases with repaired Tetralogy of Fallot is greatly aided by cardiac magnetic resonance imaging (MRI). It aids in assessing surgical repair effectiveness, identifying diagnosed complications of residual abnormalities, and directing subsequent operations by giving thorough anatomical and functional information