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Prediction of left ventricular dysfunction in coronary artery disease from clinical and exercise test findings
1Division of Cardiology, Sahlgrenska University Hospital, Göteborg, Sweden.
Insights
Clinical history, including myocardial infarction and ECG findings, better predicts depressed left ventricular ejection fraction (LVEF) than exercise tests in patients undergoing coronary artery bypass grafting (CABG). These factors are key indicators for impaired LVEF.
Area of Science:
- Cardiology
- Cardiac Surgery
- Preoperative Assessment
Background:
- Left ventricular ejection fraction (LVEF) is a critical indicator of cardiac function.
- Predicting impaired LVEF preoperatively is essential for managing patients undergoing coronary artery bypass grafting (CABG).
- The utility of clinical versus exercise test data in predicting LVEF requires further investigation.
Purpose of the Study:
- To evaluate the predictive value of clinical and exercise test findings for depressed LVEF in patients before CABG.
- To identify significant independent predictors of impaired LVEF.
Main Methods:
- Retrospective analysis of 663 patients undergoing CABG between 1988 and 1991.
- Multivariate analysis of clinical data (medical history, ECG) and exercise test results.
- Assessment of predictors for depressed LVEF.
Main Results:
- History of myocardial infarction and pathological Q-wave on resting ECG were significant independent predictors of impaired LVEF.
- Systolic blood pressure during maximal exercise and degree of mitral regurgitation also predicted LVEF.
- Exercise test results showed poor association with depressed LVEF and limited discriminatory value.
Conclusions:
- Clinical data, particularly history of myocardial infarction and ECG abnormalities, are more valuable markers for predicting depressed LVEF than exercise test results in CABG patients.
- Preoperative clinical assessment is crucial for identifying patients at risk of impaired LVEF.
Abstract:
We studied the ability to predict depressed left ventricular ejection fraction (LVEF) from clinical and exercise test findings prior to surgery in consecutive patients who underwent coronary artery bypass grafting (CABG) from 1988 to 1991 (n = 663). Multivariate analysis showed a history of myocardial infarction, pathological Q-wave in resting ECG, systolic blood pressure at maximal exercise and the degree of mitral regurgitation as significant independent predictors of impaired LVEF. The relative risk (RR) of depressed LVEF was markedly increased for a previous history of myocardial infarction (RR 3.3, p < 0.0001) and a pathological Q-wave in resting ECG (RR 2.4, p < 0.0001). All associations found between depressed LVEF and exercise test results were poor, and of little value for discriminating patients with depressed LVEF. Thus, clinical data appear to be better markers of low LVEF than the information obtained from the exercise test.