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Related Concept Videos

Aortic Regurgitation III: Medical Management01:25

Aortic Regurgitation III: Medical Management

Aortic regurgitation (AR) is when the aortic valve does not close or seal properly, leading to backward blood circulation from the aorta into the left ventricle during diastole. Common causes of AR include rheumatic heart disease, congenital valve defects, and aortic root dilation. Managing AR requires a multifaceted approach to alleviate symptoms, preserve left ventricular function, and address the underlying cause of the regurgitation. Patients with symptomatic AR or significant left...
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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...

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Related Experiment Video

Updated: May 23, 2026

Automatic Surgery in Transcatheter Aortic Valve Replacement Using Augmented Reality
07:46

Automatic Surgery in Transcatheter Aortic Valve Replacement Using Augmented Reality

Published on: August 9, 2024

Beating heart aortic valve replacement using real-time MRI guidance.

Keith A Horvath1, Michael Guttman, Ming Li

  • 1From the National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.

Innovations (Philadelphia, Pa.)
|March 23, 2012
PubMed
Summary

Real-time magnetic resonance imaging (MRI) enables precise aortic valve replacement on a beating heart. This minimally invasive technique overcomes visualization and prosthesis placement limitations of current percutaneous approaches.

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Last Updated: May 23, 2026

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Published on: October 16, 2021

Area of Science:

  • Cardiovascular Surgery
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Percutaneous aortic valve replacement faces challenges with visualization and prosthesis durability.
  • Accurate anatomical visualization is crucial for successful aortic valve implantation.

Purpose of the Study:

  • To assess the feasibility of using real-time magnetic resonance imaging (MRI) for aortic valve replacement.
  • To demonstrate precise anatomical visualization and feedback for implanting bioprostheses during beating-heart surgery.

Main Methods:

  • Aortic valve replacement was performed in twelve pigs using a minimally invasive approach under real-time MRI guidance.
  • MRI precisely identified aortic annulus, coronary ostia, and mitral valve anatomy.
  • Intraoperative perfusion, flow velocity, and functional imaging confirmed valve placement and function.

Main Results:

  • Real-time MRI enabled detailed visualization of the aortic valve and left ventricular outflow tract anatomy.
  • An active marker wire enhanced valve placement and orientation.
  • Bioprosthetic aortic valves were implanted in under 90 seconds, with an average procedure time under 40 minutes.

Conclusions:

  • Real-time MRI offers superior anatomical detail and intraoperative assessment for aortic valve implantation.
  • This technique allows for the placement of durable prostheses on a beating heart, overcoming limitations of percutaneous methods.