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Myocardial salvage with direct coronary angioplasty for acute infarction
J H O'Keefe1, B D Rutherford, D R McConahay
1Cardiovascular Consultants, Inc., Kansas City, MO 64111.
Insights
Direct coronary angioplasty significantly improves myocardial function after acute myocardial infarction. Sustained vessel patency and baseline ejection fraction correlate with better outcomes, enhancing recovery.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Function Assessment
Background:
- Acute myocardial infarction (AMI) often leads to impaired left ventricular (LV) function.
- Direct infarct angioplasty is a key intervention for AMI, but its impact on myocardial function requires detailed assessment.
Purpose of the Study:
- To evaluate changes in global and regional myocardial function after direct coronary angioplasty in AMI patients.
- To identify predictors of improved left ventricular function post-angioplasty.
Main Methods:
- Contrast ventriculography was used to assess LV function immediately before and after angioplasty (mean 7 days follow-up).
- 323 consecutive AMI patients without prior thrombolytic therapy were included.
- Multivariate analysis and logistic regression identified correlates of functional improvement.
Main Results:
- Global ejection fraction significantly improved from 52.6% to 58.9% (p<0.0005).
- Systolic function in the infarct zone improved by 30%.
- Improved function was associated with baseline ejection fraction ≤45% and infarct vessel patency at follow-up.
Conclusions:
- Direct infarct angioplasty leads to significant improvements in left ventricular function in most AMI patients.
- Sustained infarct vessel patency and anterior AMI are key predictors of regional functional recovery.
- Patients with severely depressed LV function (≤40%) at discharge had compromised long-term survival.
Abstract:
To assess the changes in myocardial function following direct coronary angioplasty, we evaluated 323 consecutive patients undergoing coronary angioplasty without antecedent thrombolytic therapy for acute myocardial infarction. Left ventricular function was evaluated using contrast ventriculography immediately preangioplasty and at the time of predismissal follow-up angiography (a mean of 7 days after infarction). The global ejection fraction increased from 52.6% to 58.9% (p less than 0.0005). Multivariate correlates of improved global left ventricular function included baseline ejection fraction less than or equal to 45%, and a patent infarct vessel at the time of predischarge follow-up angiography. Systolic function in the infarct zone improved by a mean of 30%. Logistic regression analysis identified sustained infarct vessel patency and anterior myocardial infarction as multivariate correlates of improved regional function in the infarct zone. In patients presenting with baseline ejection fractions less than or equal to 40%, the mean ejection fraction increased from 28% to 42%. Long-term survival was compromised in patients with global ejection fractions of less than or equal to 40% at the time of dismissal. Thus significant improvement in left ventricular function can be expected in the majority of patients undergoing direct infarct angioplasty. The myocardial salvage appears to be most significant in patients suffering large infarctions, and in those with sustained infarct vessel patency.