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Late ventricular dilatation in survivors of acute myocardial infarction
N Gadsbøll1, P F Høilund-Carlsen, J H Badsberg
1Department of Clinical Physiology, Glostrup Hospital, Denmark.
Insights
Following acute myocardial infarction (AMI), left ventricular (LV) volumes significantly increase during convalescence, even as heart failure signs diminish. This LV remodeling impacts heart function unpredictably.
Area of Science:
- Cardiology
- Cardiovascular Research
- Medical Imaging
Background:
- Acute myocardial infarction (AMI) can lead to significant cardiac remodeling.
- Understanding the natural course of left ventricular (LV) volumes post-AMI is crucial for patient management.
- Heart failure development after AMI is a major concern.
Purpose of the Study:
- To evaluate the changes in left ventricular (LV) volumes during the convalescent phase after acute myocardial infarction (AMI).
- To correlate changes in LV volumes with clinical signs of heart failure and infarct location.
Main Methods:
- Utilized radionuclide imaging to determine absolute left ventricular (LV) volumes.
- Assessed 57 patients at 2 weeks and approximately 1 year post-AMI.
- Compared LV volumes based on infarct location (anterior vs. inferoposterior) and presence of heart failure symptoms.
Main Results:
- Median LV end-diastolic volume index increased from 92 to 112 ml/m2 (p < 0.001) and end-systolic volume index from 51 to 65 ml/m2 (p < 0.001) after 1 year.
- Patients with anterior infarcts showed greater increases in LV volumes compared to those with inferoposterior infarcts.
- Increased LV volumes were more pronounced in patients with clinical heart failure signs.
- Changes in LV size had an unpredictable impact on LV ejection fraction.
Conclusions:
- Left ventricular (LV) volumes significantly increase in the convalescent phase after acute myocardial infarction (AMI), indicating adverse remodeling.
- LV dilation is more substantial in anterior infarcts and in patients with heart failure symptoms.
- The unpredictable effect of LV size changes on ejection fraction highlights the complexity of post-MI cardiac function.
Abstract:
The purpose of this study was to assess the natural course of left ventricular (LV) volumes in the convalescent phase of acute myocardial infarction (AMI). Fifty-seven patients were examined 2 weeks and approximately 1 year after AMI by a radionuclide method allowing determination of absolute LV volumes. After 1 year the patients had fewer clinical and radiologic signs of heart failure, but median end-diastolic volume index had increased from 92 to 112 ml/m2 (p less than 0.001), median end-systolic volume index from 51 to 65 ml/m2 (p less than 0.001) and median stroke volume index from 39 to 47 ml/m2 (p less than 0.001). Patients with first anterior infarcts had significantly greater increases in end-diastolic volume index, end-systolic volume index and stroke volume index than patients with first inferoposterior infarcts. The increase in LV volumes was significantly greater in patients with clinical manifestations of heart failure than in those without these signs. Notably, changes in LV size had an unpredictable effect on LV ejection fraction.