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[Evaluation of myocardial perfusion by intravenous contrast echomyocardiography]
Insights
Intravenous contrast echocardiography effectively enhances myocardial echo intensity using ether or hydrogen peroxide. Specific dosages are required for optimal echo enhancement in canine myocardium.
Area of Science:
- Cardiovascular Imaging
- Myocardial Perfusion Assessment
- Echocardiography
Context:
- Assessing intramyocardial blood flow distribution is crucial for understanding myocardial health.
- Intravenous contrast echocardiography offers a non-invasive method for visualizing blood flow.
- Standardized techniques are needed to optimize contrast agent efficacy.
Purpose:
- To evaluate the effectiveness of intravenous ether and hydrogen peroxide as contrast agents for echocardiographic assessment of intramyocardial blood flow.
- To determine the relationship between contrast agent dosage and myocardial echo intensity.
- To establish minimum effective dosages for echo enhancement in canine models.
Summary:
- Echocardiographic echo intensity in the interventricular septum was measured before and after intravenous injection of ether or hydrogen peroxide in dogs.
- Both agents increased myocardial echo intensity, with specific dosage-dependent relationships observed (y=127x-3 for ether, y=1.17x+1.11 for hydrogen peroxide).
- Effective echo enhancement required at least 0.2 ml of ether or 15 mg of hydrogen peroxide.
Impact:
- Establishes effective contrast agent dosages for myocardial echo enhancement in dogs.
- Provides a foundation for further research into contrast echocardiography for intramyocardial blood flow assessment.
- Contributes to the development of improved diagnostic tools for cardiovascular diseases.
Abstract:
For the echocardiographic assessment of intramyocardial blood flow distribution by intravenous contrast echocardiographic technique, we measured the echo intensity of a point (phi 6 mm) in the interventricular septum using a lightmeter in end-diastole before and after the intravenous injection of various dosages of ether or hydrogen peroxide in one open-chest and four closed-chest dogs. Before the injection of contrast media, the echo intensity of the myocardium varied within a range of 6.1 +/- 4.6% After the injection of ether or hydrogen peroxide, the echo intensity of the myocardium increased. After the occlusion of the left anterior descending artery, echo enhancement of the left ventricular wall occurred, except for the left ventricular anterior wall and the interventricular septum. Between dosage (x) and % increase (y), relations of y = 127x - 3, in ether and y = 1.17x + 1.11, in hydrogen peroxide were observed. We found that the intravenous injection of at least 0.2 ml ether or 15 mg hydrogen peroxide was necessary to achieve effective echo enhancement of the myocardium in dogs.