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Pathomorphological characteristics of cardiac remodeling after myocardial infarction
V D Rozenberg1, L M Nepomniashchikh
1Department of General Pathology and Pathomorphology, State Institute of Regional pathology and Pathomorphology, Siberian Division of the Russian Academy of Medical Sciences, Novosibirsk.
Insights
Postinfarction heart remodeling presents in four main types: dilatational, hypertrophic, aneurysmal, and endocardial. These distinct cardiac remodeling patterns significantly impact hemodynamics and patient outcomes after myocardial infarction.
Area of Science:
- Cardiology
- Pathology
- Medical Imaging
Background:
- Myocardial infarction (heart attack) triggers complex cardiac remodeling processes.
- Understanding these remodeling variants is crucial for predicting post-MI complications.
Purpose of the Study:
- To identify and characterize the distinct variants of cardiac remodeling following myocardial infarction.
- To correlate these remodeling types with intracardiac hemodynamic disturbances and outcomes.
Main Methods:
- Analysis of cardiac morphology and function in postinfarction models.
- Histopathological examination of cardiac tissue to identify remodeling features.
- Hemodynamic assessment to evaluate intracardiac blood flow dynamics.
Main Results:
- Identified four primary remodeling types: dilatational (ventricular elongation, increased volume), hypertrophic (septal/wall thickening, reduced/stable volume), aneurysmal (ventricular shape changes, aneurysm formation), and endocardial (scarring, smoothed endocardium).
- Dilatational remodeling was the most prevalent.
- Each remodeling type was associated with specific hemodynamic alterations.
Conclusions:
- Cardiac remodeling post-myocardial infarction is heterogeneous, manifesting in distinct dilatational, hypertrophic, aneurysmal, and endocardial patterns.
- These remodeling variants critically influence intracardiac hemodynamics and contribute to adverse outcomes, including death (thanatogenesis).
Abstract:
Dilatational, hypertrophic, aneurysmal, and endocardial variants of remodeling were revealed in the postinfarction heart. The most prevalent dilatational remodeling is characterized by uniform or nonuniform elongation of ventricular cavities and increase in ventricular volume. Characteristic features of the hypertrophic type are hypertrophied interventricular septa and left ventricular wall and reduced or unchanged left ventricular volume. Pronounced changes in the configuration of the left ventricle due to the formation of single or multiple aneurysms were typical of aneurysmal remodeling. Endocardial remodeling was characterized by cicatricial changes and smoothed relief of the parietal endocardium. These variants and forms of remodeling determine disturbances in intracardial hemodynamic and thanatogenesis in the postinfarction period.