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Impact of aneurysm repair on thoracic aorta hemodynamics
- Source :
- Circulation. 128(17)
- Publication Year :
- 2013
-
Abstract
- We present pre- and postoperative imaging findings in a 29-year-old man with a bicuspid aortic valve (BAV) with fusion of the right and left coronary leaflets and a 6.1 cm × 6.3 cm ascending aorta aneurysm (Figure 1). The patient underwent a valve-sparing aortic root replacement with a 34-mm Dacron graft and BAV repair with resection of the raphe of the fused leaflet and leaflet shortening of the noncoronary cusp. Figure 1. Sagital ( A ) and axial ( B ) preoperative MRI demonstrating a 6.1×6.3 cm ascending aorta (AAo) aneurysm. To better understand the preoperative flow characteristics in the large aneurysm and the impact of surgical repair and reconstruction on thoracic aorta hemodynamics, time-resolved 3-dimensional phase contrast (4D flow) MRI was performed before and after surgery. The MRI examinations (pre: 3.0 T Skyra, post: 1.5 T Avanto, Siemens, Germany) included both 4D flow MRI (velocity sensitivity pre:150 cm/s, post: 250 cm/s, spatial/temporal resolution pre: 3.14×2.13×3.2 mm3/39 ms, post: 2.88×2.13×2.15 mm3/38ms) and dynamic 2-D cine imaging of the heart (steady-state free precession, spatial/temporal resolution pre: 1.25×1.25×6 mm3/29 ms post:1.8×1.8×6 mm3/39 ms). The study was approved by the local institutional review board, and informed consent was obtained from the patient. Blood flow patterns within the thoracic aorta were visualized using time-resolved 3D pathlines to illustrate complex blood flow dynamics over the entire cardiac cycle (EnSight, CEI). In addition, 3D velocity streamlines drawn tangent to the time-resolved velocity field were used to illustrate instantaneous flow dynamics in the thoracic aorta. Forward and …
- Subjects :
- Adult
Male
medicine.medical_specialty
Hemodynamics
Article
Aortic aneurysm
Aneurysm
Bicuspid aortic valve
Postoperative Complications
Physiology (medical)
medicine.artery
Ascending aorta
medicine
Thoracic aorta
Humans
Cardiac cycle
Aortic Aneurysm, Thoracic
business.industry
Blood flow
medicine.disease
Magnetic Resonance Imaging
Cardiac Imaging Techniques
cardiovascular system
Radiology
Cardiology and Cardiovascular Medicine
business
Subjects
Details
- ISSN :
- 15244539
- Volume :
- 128
- Issue :
- 17
- Database :
- OpenAIRE
- Journal :
- Circulation
- Accession number :
- edsair.doi.dedup.....7367c3e78eb2e0e7135fe7b5b6bdbe98