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Noninvasive assessment of coronary blood flow by transthoracic Doppler echocardiography: basic to practical use in
1Miyazaki Medical Association Hospital Cardiovascular Center, 738-1 Funado, Sinbeppu-cho, Miyazaki, 880-0834, Japan. n_watanabe@cure.or.jp.
Insights
Echo Doppler enables noninvasive assessment of coronary artery disease by measuring coronary flow velocity reserve. This quick, accessible technique aids in diagnosing stenosis and evaluating reperfusion in acute coronary syndrome patients.
Area of Science:
- Cardiology
- Medical Imaging
- Echocardiography
Background:
- Echo Doppler is a widely available clinical tool.
- High-frequency transducers achieve >90% feasibility for coronary flow detection in the left anterior descending artery.
- Noninvasive techniques provide valuable physiological data for coronary artery disease.
Purpose of the Study:
- To evaluate the utility of Echo Doppler for coronary flow velocity reserve measurement.
- To assess its role in screening for coronary stenosis in stable angina.
- To determine its application in differentiating coronary reperfusion in acute coronary syndrome.
Main Methods:
- Utilizing high-frequency transducers for transthoracic coronary flow detection.
- Measuring coronary flow velocity reserve (CFVR) using Echo Doppler.
- Assessing coronary reperfusion status (TIMI-III vs. TIMI-II) in acute coronary syndrome patients.
Main Results:
- Coronary flow detection feasibility exceeds 90% with high-frequency transducers.
- Echo Doppler is a simple, easy technique available in clinical settings.
- It can differentiate TIMI-III from TIMI-II coronary reperfusion in acute coronary syndrome.
Conclusions:
- Echo Doppler is a valuable, noninvasive tool for assessing coronary artery disease.
- Coronary flow velocity reserve measurement serves as an alternative screening method for significant coronary stenosis.
- Transthoracic Echo Doppler aids in rapid assessment of coronary reperfusion status in emergency settings for acute coronary syndrome.
Abstract:
Echo Doppler is widely available in the clinical setting, and the feasibility of coronary flow detection in the left anterior descending coronary artery has been reported as >90% with the use of a high-frequency transducer. Coronary flow detection takes only a few minutes by skilled echocardiologists, and this noninvasive technique can provide useful physiological information in patients with various types of coronary artery disease. Coronary flow velocity reserve measurement by echo Doppler is a simple and easy technique. It is available in the echo laboratory as well as in the outpatient clinic, and can be used as an alternative examination to screen for significant coronary stenosis in patients with stable angina. Moreover, physiological information provided by coronary flow velocity reserve can be used in combination with other imaging modalities that can provide anatomical information of the coronary arteries such as coronary computed tomography or coronary angiography. Coronary flow velocity in patients with acute coronary syndrome (ACS) enables rapid noninvasive differentiation of TIMI-III from TIMI-II coronary reperfusion before emergency coronary intervention. Transthoracic coronary flow detection by echo Doppler contributes to the assessment of the coronary reperfusion status in the emergency room for patients with ACS, prior to invasive coronary angiography.
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