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Progressive changes in ventricular structure and function during the year after acute myocardial infarction
M H Picard1, G T Wilkins, P A Ray
1Cardiac Unit, Massachusetts General Hospital, Boston 02114.
Insights
Left ventricular endocardial surface area decreased one year after myocardial infarction, particularly in anterior and non-Q wave types. This improvement in cardiac structure was independent of initial infarct size.
Area of Science:
- Cardiology
- Echocardiography
- Cardiac Remodeling
Background:
- Myocardial infarction (MI) can lead to significant long-term changes in left ventricular (LV) structure and function.
- Understanding these post-MI cardiac remodeling patterns is crucial for predicting patient outcomes.
Purpose of the Study:
- To investigate long-term changes in left ventricular structure and function following myocardial infarction.
- To quantify changes in endocardial surface area (ESA) and area of abnormal wall motion (AWM) over one year post-MI.
Main Methods:
- Prospective study of 51 patients with first MI, assessed via two-dimensional echocardiography.
- Echocardiograms were analyzed at hospital entry, 3 months, and 1 year post-MI.
- Left ventricular endocardial surface reconstruction was used to quantify ESA index and AWM.
Main Results:
- A decrease in ESA index was observed from 3 months to 1 year in anterior and non-Q wave MIs.
- This ESA decline was independent of initial infarct size.
- Improvement in regional function (AWM) occurred, with timing related to infarction location and size.
Conclusions:
- Left ventricular remodeling continues up to one year post-MI, with a reduction in ESA in specific MI types.
- Echocardiographic assessment of ESA and AWM provides valuable insights into long-term cardiac recovery after myocardial infarction.
Abstract:
To investigate the long-term changes in left ventricular structure and function after myocardial infarction, 51 patients with a first myocardial infarction (17 anterior, 23 inferior, and 11 non-Q wave) were studied by two-dimensional echocardiography at the time of entry into the hospital, at 3 months, and 1 year after infarction. The left ventricular endocardial surface was reconstructed from these echocardiograms, and the endocardial surface area (ESA) index (in cm2/m2) and area of abnormal wall motion (AWM in cm2) were quantitated. Despite different trends in the ESA index between entry and 3-month values in those with and without early infarct expansion, a decrease in the ESA index from 3 months to 1 year was noted in anterior and non-Q wave infarctions (anterior with early expansion: 96.3 +/- 8.6 to 81.5 +/- 4.2 cm2/m2, p less than 0.05; anterior without early expansion: 59.7 +/- 2.0 to 54.7 +/- 2.0 cm2/m2, p less than 0.01; non-Q wave: 64.1 +/- 3.5 to 57.9 +/- 4.4 cm2/m2, p less than 0.01). The mean decline in ESA from 3 months to 1 year of 8.9 +/- 2.5 cm2 was independent of initial infarct size. Regional function, as represented by the area of AWM, was also improved but the timing of the improvement was related to the location and size of the infarction.(ABSTRACT TRUNCATED AT 250 WORDS)