Assessment of aortic regurgitation (AR) severity by cardiovascular MRI can be obtained directly by phase-contrast MRI. For some AR-patients, especially those with aortic dilatation and bicuspid aortic valve, the flow profile can be highly complex displaying asymmetric outflow jets, helical vortex flow and systolic backward flow. This study showed that such complex flow influences the accuracy of the AR assessment and needs to be taken into account in clinical practice as it may compromise the decision-making and timing of surgery.
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