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Quantitative assessment of left ventricular function after myocardial infarction using the minnesota Q-QS codes for
Insights
Electrocardiograms can quantitatively predict left ventricular systolic function in patients post-myocardial infarction. More significant Q-QS codes on electrocardiograms correlate with reduced ejection fraction and abnormal heart wall motion.
Area of Science:
- Cardiology
- Medical Imaging
- Biomedical Engineering
Background:
- Left ventricular systolic function is crucial after myocardial infarction.
- Accurate assessment of left ventricular function aids in patient management.
- Electrocardiograms (ECG) are routinely performed after myocardial infarction.
Purpose of the Study:
- To investigate the electrocardiogram (ECG) as a quantitative predictor of left ventricular systolic function.
- To correlate ECG findings with objective measures of left ventricular function in myocardial infarction survivors.
Main Methods:
- Studied 509 consecutive patients from the Program of Surgical Control of Hyperlipidemia.
- Utilized selective left ventriculography to assess left ventricular function.
- Classified ECGs using Minnesota Q-QS codes from prior myocardial infarction hospitalizations.
Main Results:
- Lower (more significant) Q-QS codes strongly correlated with reduced ejection fraction.
- Significant Q-QS codes were associated with a greater number of left ventricular segments exhibiting abnormal systolic motion.
- The location of ECG abnormalities (Q-QS codes) corresponded to the site of regional wall motion abnormalities.
Conclusions:
- Electrocardiograms provide a quantitative measure of left ventricular systolic function post-myocardial infarction.
- Minnesota Q-QS codes are valuable indicators of impaired cardiac function and regional wall motion abnormalities.
Abstract:
The electrocardiogram as a quantitative predictor of left ventricular systolic function was investigated in subjects with one myocardial infarction. The first 509 consecutive subjects to enter the Program of Surgical Control of Hyperlipidemia were studied by selective left ventriculography. Electrocardiograms taken during a prior hospitalization of the subjects for acute myocardial infarction were classified according to the Minnesota Q-QS codes. This study showed that the lower (ie, the more significant) Q-QS codes were highly correlated with reduced left ventricular function as measured both by a lower ejection fraction and by a greater number of left ventricular segments showing abnormal systolic motion. In addition, the location of segmental wall motion abnormalities correlated with the electrocardiographic site of the Q-QS code.