[Dysfunction of the left chamber after myocardial infarct]
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Updated: Aug 21, 2026
Myocardial Infarction and Functional Outcome Assessment in Pigs
Published on: April 25, 2014
Fahir Baraković1, Zumreta Kusljugić, Elnur Smajić
1Interna Klinika, Medicinski Fakultet Univerziteta u Tuzli, Bolnica Mostar.
Insights
Assessing left ventricular dysfunction after myocardial infarction is crucial. Echocardiography proves more sensitive than exercise testing for evaluating systolic and diastolic dysfunction, offering direct visualization of cardiac changes.
Area of Science:
- Cardiology
- Cardiac Imaging
- Heart Failure Research
Context:
- Left ventricular dysfunction is a common complication following myocardial infarction (MI).
- Chronic changes post-MI, including scar tissue and altered contractility, impair heart function.
- Understanding the extent and type of dysfunction is vital for patient management.
Purpose:
- To evaluate the effectiveness of electrocardiography (ECG), echocardiography, and exercise testing in assessing left ventricular dysfunction after myocardial infarction.
- To compare the sensitivity of these diagnostic methods in identifying systolic and diastolic dysfunction.
- To correlate imaging and functional test results with coronary angiography findings.
Summary:
- This study analyzed residual changes and functional capacity in 60 patients post-MI using ECG, echocardiography, and exercise tests.
- Echocardiography demonstrated higher sensitivity (100%) for diastolic dysfunction compared to exercise testing (71.43%).
- Reduced ejection fraction and prolonged deceleration time were key echocardiographic indicators of systolic and diastolic dysfunction, respectively.
Impact:
- Echocardiography is recommended as a more sensitive tool for appraising left ventricular dysfunction post-MI due to its direct visualization capabilities.
- Findings highlight the complementary nature of diagnostic methods, aiding in comprehensive patient assessment.
- Improved diagnostic accuracy can lead to more tailored and effective treatment strategies for post-MI patients.
Abstract:
Dysfunction of the left chamber of the heart happens when the function is not sufficient to supply all organs with needed quantity of blood, oxygen and nourishing materials. Consequence is an exhaustion of the heart compensatory and peripheral mechanisms. The research is based on the results of the analysis of residual changes that remained since acute myocardium infarct got over (scar, contracture changes, conductivity) and analysis of the remained functional part of the left chamber myocardium. Electrocardiogram, echocardiography and exercise test were used. 60 patients were examined. 6 varieties of chronic myocardium infarcts were found: anteroseptal, inferior, anterolateral and anterior-broaden, high-lateral and posterior localisation. Wagner's method QRS-scoring system and scores for wall motion by the American of ehocardiography were found the damage size of the myocardium mass. Correlative coefficient is full (r = 1.0). In chi2-test there is no significant difference (Wagner, echocardiography) in dimensions of old infarct (p < 0.05). Dyastolic dysfunction was set by echocardiographic method for 75%, systolic 41.11% examinees, remodelling in 80%, extended isovolumetric relaxation time and time of deceleration in 100% cases, speed ratio E-wave and A-wave below 1.0 in 82.66% cases. Exercise test was made for 85% examinees. Dysfunction was registered in 84.37%, diastolic in 80.39%, systolic in 43.17% cases. On the base of coronarographie results (23.33% examinees) the sensitivity was set for: exercise test in systolic dysfunction is 42.86%, in dyastolic is 71.43% and echocardiography in systolic disfunction is 57.14%, in dyastolic 100%. According to echocardiographic analysis of parameters the greatest influence has reduction of ejection fraction with 36.67% in systolic and extension of the period of deceleration with 38.79% in diastolic dysfunction. There is a good complement of the tested methods (p < 0.05). There is possibility, with these methods to appraise dysfunction of the left chamber in old myocardium infarct with conclusion that echocardiography is more sensitive since gives more data and direct visualization of changes.
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