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Myocardial Infarction and Functional Outcome Assessment in Pigs
Published on: April 25, 2014
[Left ventricular function and infarction size after primary angioplasty for acute myocardial infarction]
Sigrun Halvorsen1, Carl Müller, Bjørn Bendz
1Hjerte-Lungesenteret, Ullevål universitetssykehus 0407 Oslo. sigrun.halvorsen@ulleval.no
Insights
Primary angioplasty for acute myocardial infarction preserves left ventricular function and reduces infarct size long-term. These positive effects on cardiac health are maintained up to 20 months post-treatment.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Imaging
Background:
- Limited data exists on long-term left ventricular (LV) function and infarct size post-primary angioplasty for acute myocardial infarction (AMI).
- Understanding these long-term changes is crucial for assessing treatment efficacy and patient outcomes.
Purpose of the Study:
- To evaluate long-term changes in left ventricular ejection fraction (LVEF) and infarct size after primary angioplasty in patients with ST-elevation myocardial infarction (STEMI).
Main Methods:
- A cohort of 100 consecutive STEMI patients treated with primary angioplasty between 1996-1998.
- Left ventricular ejection fraction assessed via radionuclide ventriculography at discharge, 6 weeks, and 20 months.
- Infarct size evaluated using technetium 99m-tetrofosmin SPECT imaging at similar intervals.
Main Results:
- Mean LVEF remained stable: 56% at discharge, 55% at 6 weeks, and 57% at 20 months.
- Mean myocardial perfusion defect (infarct size) decreased significantly from 19% at 1 week to 14% at 6 weeks (p < 0.001) and remained reduced at 15% at 20 months.
Conclusions:
- Primary angioplasty for STEMI leads to well-preserved left ventricular function up to 20 months post-procedure.
- Infarct size is significantly reduced and maintained long-term, indicating sustained therapeutic benefits.
Background:
There is little information available on long-term changes in left ventricular function and infarct size after acute myocardial infarction treated with primary angioplasty.
Material And Methods:
From 1996 to 1998, 100 consecutive patients were treated with primary angioplasty for acute ST-elevation myocardial infarction. Left ventricular ejection fraction was determined by radionuclide ventriculography before discharge, after six weeks and after a mean follow-up time of 20 months (range 11-37). Infarct size was assessed by technetium 99m-tetrofosmin myocardial perfusion tomography (SPECT) at rest, performed at the same time intervals.
Results:
Mean ejection fraction was 56% at discharge, 55% after six weeks and 57% after 20 months of follow-up. A mean perfusion defect of 19% was measured by SPECT after one week. After six weeks and 20 months of follow-up, the mean perfusion defects were reduced to 14% (p < 0.001) and 15%, respectively.
Interpretation:
Left ventricular function was well preserved and infarct sizes small to moderate 20 months (range 11-37) after primary angioplasty for acute myocardial infarction, demonstrating that the initial successful effect of the treatment was maintained.
