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Echocardiographic assessment of viable myocardium
1College of Physicians and Surgeons, Columbia University, St Luke's-Roosevelt Hospital, New York, NY 10025, USA.
Insights
Dobutamine echocardiography accurately identifies reversible left ventricular dysfunction in coronary artery disease patients. Revascularization of hibernating or stunned myocardium can improve function and prognosis.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Left ventricular dysfunction is critical for coronary artery disease prognosis.
- Dysfunction may be reversible (hibernating or stunned myocardium), not solely due to necrosis.
- Revascularization can improve cardiac function and patient outcomes.
Purpose of the Study:
- To establish dobutamine echocardiography as a reliable method for assessing reversible left ventricular dysfunction.
- To evaluate the accuracy of dobutamine echocardiography in identifying myocardial viability.
Main Methods:
- Utilized dobutamine echocardiography to assess left ventricular function.
- Evaluated sensitivity, specificity, and predictive accuracy for reversible dysfunction.
Main Results:
- Dobutamine echocardiography is a safe and accurate imaging modality.
- Demonstrated good sensitivity and specificity in identifying acute and chronic reversible dysfunction.
- Confirmed high positive predictive accuracy for risk stratification and prognosis.
Conclusions:
- Dobutamine echocardiography is effective for identifying reversible left ventricular dysfunction in coronary artery disease.
- This imaging modality aids in risk stratification and prognosis assessment.
- Identifying viable myocardium guides revascularization decisions for improved outcomes.
Abstract:
Left ventricular function is one of the most important determinates of long-term prognosis in patients with coronary artery disease. In recent years, it has become apparent that left ventricular dysfunction in patients with coronary artery disease is not always an irreversible process stemming from myocardial necrosis and fibrosis. Myocardial tissue can undergo both a state of potential reversible dysfunction because of prolonged sustained ischemia (hibernating myocardium) or episodes of acute ischemia (stunned myocardium). Revascularization of this tissue may improve regional and global left ventricular function and therefore prognosis. Numerous studies have now firmly established dobutamine echocardiography as a safe, reliable, and accurate imaging modality in the assessment of reversible left ventricular dysfunction. Furthermore, dobutamine echocardiography has been shown to have good sensitivity, specificity, and, more importantly, positive predictive accuracy in identifying both acute and chronic reversible left ventricular dysfunction for risk satisfaction and prognosis.