Use of Non-Invasive Phase Contrast Magnetic Resonance Imaging for Estimation of Atrial Septal Defect Size and Morphology: A Comparison with Transesophageal Echo |
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Authors: | Chin Sze Piaw Ong Tiong Kiam Annuar Rapaee Liew Chee Khoon Liew Houng Bang Chan Wei Ling Hasri Samion Sim Kui Hian |
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Institution: | (1) Department of Cardiology, Sarawak General Hospital, Jalan Tun Ahmad Zaidi Adruce, Kuching, 93580, Sarawak, East Malaysia;(2) University of Malaysia Sarawak, Sarawak, East Malaysia;(3) Pediatric of Cardiology, National Heart Institute, Kuala Lumpur, Malaysia |
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Abstract: | Background: Transesophageal echocardiography (TEE) is a trusted method of sizing atrial septal defect (ASD) prior to percutaneous closure
but is invasive, uncomfortable, and may carry a small risk of morbidity and mortality. Magnetic resonance imaging (MRI) may
be useful non-invasive alternative in such patients who refuse or are unable to tolerate TEE and may provide additional information
on the shape of the A0SD.
Purpose: To validate the accuracy of ASD sizing by MRI compared with TEE.
Method: Twelve patients (mean age 30 years; range 11–60 years) scheduled for ASD closure underwent TEE, cine balanced fast field
echo MRI (bFFE-MRI) in four-chamber and sagittal views and phase-contrast MRI (PC-MRI) with reconstruction using the two orthogonal
planes of T2-weighted images as planning. The average of the three longest measurements for all imaging modalities was calculated
for each patient.
Results: Mean maximum ASD length on TEE was 18.8 ± 4.6 mm, mean length by bFFE-MRI was 20.0 ± 5.0 mm, and mean length by PC-MRI was
18.3 ± 3.6 mm. The TEE measurement was significantly correlated with the bFFE-MRI and PC-MRI measurements (Pearson r = 0.69, p = 0.02 and r = 0.59, p = 0.04, respectively). The mean difference between TEE and bFFE-MRI measurements was −1.2mm (95% CI: −3.7, 1.3) and between
TEE and PC-MRI was 0.5 mm (95% CI: −1.9, 2.9). Bland–Altman analysis also determined general agreement between both MRI methods
and TEE. The ASDs were egg-shaped in two cases, circular in 1 patient and oval in the remaining patients.
Conclusion: ASD sizing by MRI using bFFE and phase-contrast protocols correlated well with TEE estimations. PC-MRI provided additional
information on ASD shapes and proximity to adjacent structures. |
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Keywords: | ASD MRI Phase contrast imaging TEE |
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