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Visualization of coronary artery anomalies and their anatomic course by contrast-enhanced electron beam tomography
D Ropers1, W Moshage, W G Daniel
1Department of Internal Medicine II, University of Erlangen-Nuernberg, Germany. dieter.ropers@rzmail.uni-erlangen.de
Insights
Contrast-enhanced electron beam tomography (EBT) reliably identifies anomalous coronary arteries and their course. This noninvasive imaging technique accurately visualizes congenital heart variations, aiding in diagnosis and risk assessment for myocardial ischemia.
Area of Science:
- Cardiology
- Medical Imaging
- Radiology
Background:
- Anomalous coronary arteries are rare but can lead to serious cardiac events like myocardial ischemia and sudden death.
- Accurate identification of coronary artery anomalies is critical for patient management and risk stratification.
- Noninvasive imaging methods are sought to reliably visualize these anatomical variations.
Purpose of the Study:
- To evaluate the diagnostic capability of contrast-enhanced electron beam tomography (EBT) in identifying anomalous coronary arteries and their anatomical course.
- To compare the accuracy of EBT with invasive coronary angiography for detecting coronary anomalies.
Main Methods:
- Thirty patients with known coronary anomalies and 30 healthy controls underwent contrast-enhanced EBT.
- EBT involved acquiring 40-50 ECG-gated axial images during contrast injection.
- Three-dimensional reconstructions were used by two blinded observers to analyze coronary anatomy, with results compared to invasive angiography.
Main Results:
- EBT correctly identified all normal subjects and all patients with coronary anomalies.
- The anatomical course of coronary anomalies was accurately classified in 97% of patients (29/30).
- Specific anomalies identified included variations in the origin of the left main and left circumflex coronary arteries, and coronary fistulas.
Conclusions:
- Contrast-enhanced electron beam tomography (EBT) is a reliable noninvasive method for identifying anomalous coronary arteries.
- EBT accurately delineates the course of coronary anomalies, providing crucial anatomical information.
- This technique offers a valuable alternative to invasive angiography for the diagnosis of coronary artery variations.
Abstract:
Anomalous coronary arteries are rare conditions. However, they may cause myocardial ischemia and sudden death and their reliable identification is crucial for any imaging method that attempts coronary artery visualization. We studied the ability of contrast-enhanced electron beam tomography (EBT) to identify anomalous coronary arteries and their course. Thirty patients with previously identified coronary anomalies and 30 subjects with normal coronary anatomy were studied. By EBT, 40 to 50 axial images of the heart (3-mm slice thickness, 1 mm overlap, electrocardiographic trigger) were acquired in a single breathhold during continuous injection of contrast agent (160 ml, 4 ml/s). Based on the original images and 3-dimensional reconstructions, the EBT data were analyzed by 2 blinded observers as to the presence of coronary anomalies and their course. Results were compared with invasive angiography. EBT correctly identified all normal controls and all patients with coronary anomalies. The anatomic course of the coronary anomalies was correctly classified in 29 of 30 patients (97%), including right-sided origin of the left main coronary artery (n = 4) or of the left circumflex coronary artery (n = 15), left-sided origin of the right coronary artery (n = 9), and 1 coronary fistula from the left circumflex coronary artery to the right atrium. Only the distal anastomosis of a second fistula from the left circumflex coronary artery to a bronchial artery was not correctly identified. This study demonstrates that contrast-enhanced EBT is a reliable noninvasive technique to identify anomalous coronary arteries and their course.