Abstract
(1) Background: We used four-dimensional phase-contrast magnetic resonance imaging (4D PC-MRI) to evaluate the impact of an endovascular aortic repair (TEVAR) on aortic dissection. (2) Methods: A total of 10 patients received 4D PC-MRI on a 1.5-T MR both before and after TEVAR. (3) Results: The aortas were repaired with either a GORE TAG Stent (Gore Medical; n = 7) or Zenith Dissection Endovascular Stent (Cook Medical; n = 3). TEVAR increased the forward flow volume of the true lumen (TL) (at the abdominal aorta, p = 0.047). TEVAR also reduced the regurgitant fraction in the TL at the descending aorta but increased it in the false lumen (FL). After TEVAR, the stroke distance increased in the TL (at descending and abdominal aorta, p = 0.018 and 0.015), indicating more effective blood transport per heartbeat. Post-stenting quantitative flow revealed that the reductions in stroke volume, backward flow volume, and absolute stroke volume were greater when covered stents were used than when bare stents were used in the FL of the descending aorta. Bare stents had a higher backward flow volume than covered stents did. (4) Conclusions: TEVAR increased the stroke volume in the TL and increased the regurgitant fraction in the FL in patients with aortic dissection.
Highlights
A recent study recognized that the increased aortic diameter, increased false lumen extent, and forming thrombosis within false lumen were strongly associated with late adverse events [5]
We performed imaging on a 1.5-T Magnetic resonance imaging (MRI) scanner (Ingenia Rev R5 V30-rev.02; Philips, Amsterdam, the Netherlands) by using an electrocardiogram gating system, with the Diagnostics 2021, 11, 1912 tient lying in a supine position
Between April 2017 and July 2021, we enrolled 51 patients whose aortic pathologies had been evaluated through 4D Phase-contrastmagnetic magneticresonance resonanceimaging imaging (PC-MRI) at a tertiary hospital
Summary
Intramural hematoma, perforated aortic ulcers, and type A and type B aortic dissection (AD) have been described as acute aortic syndromes [1,2,3,4]. AD remain at significant risk for late adverse events. A recent study recognized that the increased aortic diameter, increased false lumen extent, and forming thrombosis within false lumen were strongly associated with late adverse events [5]. Thoracic endovascular aortic repair (TEVAR) has been used to reduce the growth of the dissecting aortic aneurysms in acute aortic syndrome. The effect of the TEVAR impact on hemodynamics is
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