Seismocardiography and 4D flow MRI reveal impact of aortic valve replacement on chest acceleration and aortic hemodynamics |
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| Authors: | Ethan M. I. Johnson PhD Mozziyar Etemadi MD PhD S. Chris Malaisrie MD Patrick M. McCarthy MD Michael Markl PhD Alex J. Barker PhD |
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| Affiliation: | 1. Biomedical Engineering, Northwestern University, Evanston, Illinois;2. Biomedical Engineering, Anesthesiology, Northwestern University, Evanston, Illinois;3. Cardiac Surgery, Northwestern University, Evanston, Illinois;4. Radiology, Biomedical Engineering, Northwestern University, Evanston, Illinois;5. Radiology, Bioengineering, University of Colorado, Anschutz Medical Campus, Aurora, Colorado |
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| Abstract: | Aortic valve replacement (AVR) is a common treatment for severe aortic valve disease, which can adversely affect blood flow in the aorta. Seismocardiography (SCG) measures physical vibrations at the exterior of the chest, which can be sensitive to altered cardiac function and flow dynamics. Magnetic resonance imaging (MRI) can image blood movement, and it can provide depiction and quantification of aortic flow. Here we present SCG and MRI measurements from before and after AVR and ascending aorta replacement, in the case of a woman with bicuspid aortic valve disease and a dilated ascending aorta. SCG measurements show elevated energy during systole indicating stenotic flow before surgery and lowered systolic energy levels after replacement with a prosthetic valve. MRI shows jetting, helical flow before surgery, and cohesive flow after. |
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| Keywords: | aorta and great vessels bicuspid aortic valve magnetic resonance imaging (MRI) seismocardiography (SCG) valve repair/replacement |
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