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Visualization of coronary blood flow by color Doppler imaging with a transesophageal approach
M Yamagishi1, K Miyatake, S Beppu
1Cardiology Division of Medicine, National Cardiovascular Center, Osaka, Japan.
Insights
Transesophageal color Doppler imaging effectively visualizes coronary blood flow (CBF) in major coronary arteries. This noninvasive technique shows normal flow patterns and may help detect abnormalities, warranting further investigation for coronary stenosis.
Area of Science:
- Cardiovascular Imaging
- Echocardiography
- Hemodynamics
Background:
- Assessing coronary blood flow (CBF) noninvasively is crucial for diagnosing cardiovascular diseases.
- Traditional methods for visualizing CBF can be invasive or limited in scope.
Purpose of the Study:
- To evaluate the feasibility of using transesophageal color Doppler imaging to visualize coronary blood flow (CBF).
- To determine if this technique can identify normal flow patterns in the left main (LMT) and proximal left anterior descending (LAD) coronary arteries.
Main Methods:
- Utilized a transesophageal color Doppler imaging system to visualize CBF in patients post-heart surgery.
- Employed 2-dimensional echocardiography to identify the LMT and proximal LAD.
- Analyzed Doppler spectrograms for flow velocity patterns.
Main Results:
- Successfully imaged the LMT and proximal LAD in 36 of 39 patients.
- Observed predominantly blue color coding, indicating proximal-to-distal flow, in 32 patients.
- Detected flow aliasing (yellow/red) suggestive of high velocity or turbulence in some cases.
- Doppler spectrograms confirmed typical LAD flow patterns with a diastolic component.
Conclusions:
- Transesophageal color Doppler imaging is a valuable noninvasive tool for visualizing coronary blood flow (CBF).
- The technique demonstrates normal coronary artery flow patterns effectively.
- Further research is needed to ascertain its utility in detecting flow abnormalities caused by coronary stenosis.
Abstract:
To examine whether CBF can be imaged by color Doppler technique, we visualized CBF using a transesophageal color Doppler imaging system. In 36 of 39 patients with normal coronary arteriograms after heart surgery, the LMT and the proximal LAD were clearly imaged by 2-dimensional echocardiography. Among them, CBF was coded mainly in blue in 32 patients, showing that the flow runs from proximal to distal. In some cases, yellowish and/or reddish components were seen, suggesting the occurrence of aliasing associated with augmentation of flow velocity or flow turbulence. The fast Fourier transformation spectrogram of the pulsed Doppler sampled in the colored flow showed a typical flow velocity pattern of the LAD, which mainly consisted of a predominantly diastolic component. These results indicate that the transesophageal color Doppler technique is advantageous in noninvasively imaging CBF. It should be further sought whether flow abnormality due to coronary stenosis could be determined by this technique.