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Left Ventricular Outflow Tract Obstruction in Congenital Heart Disease: The Role of Cardiovascular Computed
B Kelly Han1, Edem Binka1, Eric Griffiths2
1Division of Pediatric Cardiology, Primary Children's Hospital, University of Utah, Salt Lake City, Utah.
Insights
Cardiovascular Computed Tomography (CCT) precisely visualizes complex heart obstructions, aiding surgical planning for congenital heart disease (CHD) and hypertrophic cardiomyopathy patients. Advanced CCT imaging reduces radiation and the need for anesthesia, improving patient safety.
Area of Science:
- Cardiology
- Medical Imaging
- Pediatric Cardiology
Background:
- Left ventricular outflow tract obstruction (LVOTO) is common in congenital heart disease (CHD) and hypertrophic cardiomyopathy.
- Surgical intervention is often required to relieve LVOTO.
- Accurate visualization is crucial for effective surgical planning.
Purpose of the Study:
- To highlight the role of Cardiovascular Computed Tomography (CCT) in defining complex LVOTO.
- To demonstrate how advanced CCT visualization aids surgical planning.
- To showcase novel applications of CCT in pediatric cardiac patients.
Main Methods:
- Utilizing 2D, 3D, and 4D CCT to visualize the ventricular outflow tract pathway.
- Employing advanced CCT technology with submillimeter resolution and high temporal resolution.
- Implementing ECG gating and pulse modulation to minimize radiation dose.
- Performing scans within a single heartbeat or breath hold to reduce anesthesia need.
Main Results:
- CCT effectively defines the intricate anatomy of LVOTO in the subaortic, valvar, and supravalvular spaces.
- High-resolution imaging is achievable even in pediatric patients with fast heart rates.
- Reduced radiation exposure and minimized need for sedation/anesthesia were achieved.
Conclusions:
- Advanced CCT is a valuable tool for visualizing and planning interventions for complex LVOTO.
- CCT enhances surgical planning by providing detailed 3D/4D anatomical insights.
- The safety profile of CCT, with reduced radiation and anesthesia, is beneficial for high-risk CHD patients.
Abstract:
Patients with many forms of congenital heart disease (CHD) and hypertrophic cardiomyopathy undergo surgical intervention to relieve left ventricular outflow tract obstruction (LVOTO). Cardiovascular Computed Tomography (CCT) defines the complex pathway from the ventricle to the outflow tract and can be visualized in 2D, 3D, and 4D (3D in motion) to help define the mechanism and physiologic significance of obstruction. Advanced cardiac visualization may aid in surgical planning to relieve obstruction in the left ventricular outflow tract, aortic or neo-aortic valve and the supravalvular space. CCT scanner technology has advanced to achieve submillimeter, isotropic spatial resolution, temporal resolution as low as 66 msec allowing high-resolution imaging even at the fast heart rates and small cardiac structures of pediatric patients ECG gating techniques allow radiation exposure to be targeted to a minimal portion of the cardiac cycle for anatomic imaging, and pulse modulation allows cine imaging with a fraction of radiation given during most of the cardiac cycle, thus reducing radiation dose. Scanning is performed in a single heartbeat or breath hold, minimizing the need for anesthesia or sedation, for which CHD patents are highest risk for an adverse event. Examples of visualization of complex left ventricular outflow tract obstruction in the subaortic, valvar and supravalvular space will be highlighted, illustrating the novel applications of CCT in this patient subset.
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