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[Prediction of future physical work capacity based on serial echocardiography in patients with acute myocardial
1Third Department of Internal Medicine, Showa University, School of Medicine, Hatanodai, Tokyo.
Insights
Echocardiograms during acute myocardial infarction can predict future physical work capacity. Poor tolerance patients showed increased left ventricular dimensions and altered mitral valve function compared to good tolerance patients.
Area of Science:
- Cardiology
- Cardiac Imaging
- Exercise Physiology
Context:
- Myocardial infarction (MI) significantly impacts patients' long-term physical work capacity.
- Early assessment of post-MI prognosis is crucial for patient management.
- Echocardiography is a non-invasive tool for evaluating cardiac function.
Purpose:
- To predict future physical work capacity in myocardial infarction patients.
- To identify echocardiographic markers associated with exercise tolerance post-MI.
- To compare echocardiographic findings between patients with good and poor exercise tolerance.
Summary:
- This study analyzed echocardiograms from 55 myocardial infarction patients during the acute stage.
- Patients were categorized into good (>= 5.0 Mets) and poor (< 5.0 Mets) exercise tolerance groups.
- Poor tolerance was associated with increased left ventricular and left atrial dimensions, smaller mitral valve echo amplitude, higher A/R ratio, elevated pulmonary pressures, and lower cardiac index and ejection fraction.
Impact:
- Echocardiographic parameters in the acute phase can serve as predictors of functional capacity after myocardial infarction.
- Findings can aid in stratifying patients at risk for reduced exercise tolerance.
- Early identification of patients with poor prognosis may allow for targeted interventions.
Abstract:
The future physical work capacity of patients with myocardial infarction was predicted based on echocardiograms recorded during the acute stage. Subjects consisted of 55 patients with initial myocardial infarction who were admitted to the CCU within 24 hours after their attacks (anterior 26, inferior 23, non-transmural 6; age 24-85 years). Subjects were categorized in the good tolerance group (greater than or equal to 5.0 Mets; 35 cases) and poor tolerance group (less than 5.0 Mets, or incapable of performing the test; 20 cases) based on multi-stage exercise tests before discharge. These two groups were compared as to their serial echocardiograms made during the two weeks after onset, their maximum myocardial enzyme values, and hemodynamics (catheterization and coronary angiography) on admission and in the chronic stage. Left ventricular dimension did not change in the good tolerance group, but increased in the poor tolerance group. Left atrial dimension showed the same tendency. In the poor tolerance group, the amplitude of the mitral valve echo was smaller, and the A/R ratio of left ventricular inflow velocity was higher, compared with the good tolerance group, though maximum values of myocardial enzyme and coronary angiographic findings were similar. Pulmonary artery and capillary wedge pressures in the acute stage were higher, and cardiac index and left ventricular ejection fraction were lower in the poor tolerance group.(ABSTRACT TRUNCATED AT 250 WORDS)