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Abstract #2703

Assessment of Left Ventricular Abnormal Twist in Repaired Tetralogy of Fallot Patients Using Phase-Contrast MRI

Meng-Chu Chang 1 , Ming-Ting Wu 2 , Marius Menza 3 , Mao-Yuan Su 4 , Hung-Chieh Huang 2 , and Hsu-Hsia Peng 5

1 Interdisciplinary Program of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, 2 Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, 3 Medical Physics, Department of Radiology, University Hospital Freiburg, Freiburg, Germany, 4 Department of Medical Imaging, National Taiwan University Hospital, Taipei, Taiwan, 5 Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan

After the repaired surgery for tetralogy of Fallot (rTOF) patients, residual pulmonary regurgitation becomes the most problematic sequel, which leads to heart failure and influences the long-term mortality. Therefore, early detection of restrictive myocardial function is important. In this study, our purpose is to evaluate circumferential myocardial motion velocity (V∅) for rTOF patients and to speculate the dyssynchrony by using dark-blood phase-contrast MRI. Patients with rTOF presented weaker rotation during systole and dyssynchrony during diastole. These parameters can provide satisfied information to characterize cardiac twist function of rTOF patients before the cardiac function is impacted.

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