Related Experiment Videos
Functional MRI in ischemic heart disease based on detection of contraction abnormalities
1Department of Internal Medicine/Cardiology, Charité, Campus Virchow Klinicum, Humboldt University and German Heart Institute, 13353 Berlin, Germany. eike.nagel@charite.de
Insights
Cardiovascular magnetic resonance (CMR) imaging offers superior accuracy for detecting coronary artery disease and myocardial ischemia, especially when echocardiography yields poor images. Dobutamine stress CMR may replace echocardiography in these challenging cases.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Non-invasive tests for coronary artery disease (CAD) and myocardial ischemia lack sufficient accuracy, as evidenced by negative coronary angiograms.
- Echocardiography is the standard for assessing wall motion abnormalities during stress but often produces suboptimal images.
Purpose of the Study:
- To review the literature on dobutamine stress cardiovascular magnetic resonance (CMR) imaging for detecting stress-induced wall motion abnormalities.
- To discuss the safety and efficacy of CMR stress examinations.
Main Methods:
- Review of existing literature on dobutamine stress CMR.
- Comparison of dobutamine stress CMR with dobutamine stress echocardiography.
Main Results:
- Cardiovascular magnetic resonance (CMR) imaging provides high-resolution, non-invasive visualization of cardiac function and structure.
- Dobutamine stress CMR demonstrates superior performance compared to dobutamine stress echocardiography in patients with suboptimal echocardiographic image quality.
- Identical pharmacological stress protocols used in echocardiography can be applied to CMR.
Conclusions:
- Dobutamine stress CMR is a highly accurate and safe non-invasive method for detecting obstructive coronary artery disease and myocardial ischemia.
- CMR stress imaging may be a valuable alternative or replacement for echocardiography in patients with poor image quality.
- Future advancements may involve myocardial tagging and intravascular contrast agents to further enhance CMR capabilities.
Abstract:
Even though several non-invasive techniques are available for the assessment of coronary artery disease and the detection of myocardial ischemia, many coronary angiograms yield negative results, thus, warranting higher accuracy for non-invasive tests. The detection of obstructive coronary artery disease is only possible during physical or pharmacological stress. Currently, the assessment of wall motion abnormalities by echocardiography is clinically the most widely used method. However, a significant number of patients yield suboptimal or non-diagnostic images despite improvements with harmonic imaging. Cardiovascular magnetic resonance (CMR) imaging allows a non-invasive visualization of the heart with high spatial and temporal resolution. Gradient echo CMR images permit an exact and reproducible determination of global and regional left ventricular function, wall thickness and wall thickening and identical pharmacological stress protocols, as currently used for dobutamine stress echocardiography, can be implemented for CMR imaging. A review of the literature on dobutamine stress CMR for the detection of stress induced wall motion abnormalities is presented and the safety of CMR stress examinations is discussed. The results show, that especially in those patients with suboptimal echocardiographic image quality dobutamine stress CMR is superior in comparison with dobutamine stress echocardiography and may replace echocardiography in these patients. Further possibilities by the use of myocardial tagging or intravascular contrast agents are outlined.