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[Visualization of intramyocardial blood flow distribution with contrast echomyocardiography]
Insights
Contrast echocardiography effectively visualizes intramyocardial blood flow. This technique uses contrast agents to enhance echo intensity, mapping blood flow distribution in the heart muscle.
Area of Science:
- Cardiology
- Medical Imaging
- Physiology
Context:
- Assessing intramyocardial blood flow is crucial for diagnosing and managing various cardiac conditions.
- Traditional methods for evaluating myocardial perfusion have limitations.
- Contrast echocardiography offers a potential advancement in visualizing blood flow within the heart muscle.
Purpose:
- To evaluate the efficacy of contrast echocardiography in assessing intramyocardial blood flow distribution.
- To determine the relationship between contrast agent injection and changes in myocardial echo intensity.
- To validate the technique in both animal models and human subjects.
Summary:
- Experiments in dogs demonstrated that intracoronary injections of specific contrast agents (urografin, FC-43, microspheres) significantly increased myocardial echo intensity in regions supplied by the left circumflex coronary artery (LCX) and left anterior descending artery (LAD).
- These enhanced echo areas accurately corresponded to the vascular territories of the injected coronary arteries.
- Clinical application in 10 patients undergoing coronary arteriography (CAG) showed increased echo intensity in the interventricular septum (IVS) during left CAG and in the left ventricular posterior wall (LVPW) during right CAG, confirming the technique's utility.
Impact:
- Contrast echocardiography provides a non-invasive and effective method for evaluating intramyocardial blood flow.
- This technique can aid in the diagnosis of coronary artery disease and assessment of myocardial perfusion.
- The findings support the integration of contrast-enhanced echocardiography into clinical practice for improved cardiac diagnostics.
Abstract:
To assess intramyocardial blood flow distribution by the contrast echocardiographic technique, we studied the effect of intracoronary injections of contrast agents on the echo intensity of the myocardium. As fundamental experiments, we made injections of ICG, urografin, artificial blood (FC-43) and microsphere into the coronary artery in open chest dogs and observed the changes in echo density of the myocardium. Bolus injection of 10 ml ICG into the coronary artery produced little change in the myocardial echo intensity, but bolus injection of 10 ml urografin, FC-43 and microsphere into the left circumflex coronary artery (LCX) and left anterior descending coronary artery (LAD) immediately increased the echo intensity of the left ventricular posterior wall (LVPW) and interventricular septum (IVS), respectively. Enhanced echo areas correlated well with the regions perfused by LCX and LAD, respectively. Clinically, we recorded two-dimensional echocardiograms during coronary arteriography (CAG) in 10 patients. In six of the 10 patients, the echo intensity of IVS increased during left CAG and in four of eight patients the echo intensity of LVPW increased during right CAG. Contrast echomyocardiography, contrast enhanced echocardiography of the myocardium, proved a useful technique for the evaluation of intramyocardial blood flow.