Heart wall
Searched over 200M research papers for "heart wall"
Summary
10 papers analyzed
These studies suggest that advancements in MR imaging, modeling techniques, and noninvasive methods significantly enhance the analysis and understanding of heart wall motion, structure, and function, with applications in both clinical and research settings.
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Heart Wall: Structure, Function, and Analysis
Heart Wall Motion and Magnetic Resonance Imaging (MRI)
Improved Spatial Modulation for Heart Wall Motion Analysis
Magnetic resonance imaging (MRI) has been a pivotal tool in studying heart wall motion. A method involving nonselective radio-frequency (RF) pulses, separated by a magnetic field gradient pulse, creates images with a pattern of stripes that move with the heart wall. This technique has been enhanced by using more RF pulses with amplitudes distributed according to the binomial sequence, resulting in sharper stripes. This allows for a more detailed study of heart wall motion and provides a unique method for analyzing regional ventricular myocardial strain.
Two-Dimensional Analysis and Functional Imaging
MRI tagging of the heart wall enables noninvasive regional analysis of within-wall motion, separating it into components of rigid body motion and deformation. This method provides functional images that are valuable for both basic physiological and clinical research applications.
Structural and Functional Adaptations in Athletes
Divergent Cardiac Adaptations in Athletes
Athletes exhibit different morphological forms of the heart depending on the type of exercise performed. Endurance-trained athletes tend to have a thicker left ventricular wall compared to strength-trained athletes. This meta-analysis confirms that endurance and strength training lead to distinct cardiac adaptations, with significant differences in left ventricular wall thickness, internal diameter, and interventricular septum thickness. Despite these structural differences, both groups maintain normal systolic and diastolic functions.
Myofiber Arrangement and Heart Wall Optimization
Helicoidal Myofiber Arrangement
Heart wall myofibers are arranged in helices around the ventricles, similar to the reinforcement of concrete columns by spiral steel cables. This arrangement, known as the generalized helicoid, optimizes the heart's function by economizing fiber length and enhancing ventricular ejection volume. This model is consistent across species and provides a foundation for heart tissue engineering and the study of heart muscle diseases.
Pathological Studies and Cardiac Topography
Anterior Wall Configuration in Pathological Conditions
Anatomic examinations of the anterior heart wall in cadavers reveal its configuration and relationship to the anterior chest wall under various pathological conditions. These studies enhance the understanding of heart growth tendencies in hypertrophy and dilatation, providing detailed diagrams that complement roentgenologic observations.
Noninvasive Measurement Techniques
Transcutaneous Measurement of Heart Wall Vibrations
A novel method for noninvasive diagnosis of heart disease involves transcutaneous measurement of small vibration signals from the heart wall. This technique accurately tracks heart wall movement and analyzes vibrations in both time and frequency domains, offering potential for acoustical diagnosis of heart disease.
Automatic Identification of Heart Wall and Chambers
To improve the usability and reduce examiner dependence in cardiac function evaluation, an automatic method for heart wall identification has been developed. This method focuses on the relative temporal change of ultrasonic scatterer distribution, using features such as cross-correlation of RF signals and spatial dispersion of movement vectors. This approach enhances the accuracy of heart wall and chamber identification.
Visualization and Modeling Techniques
Two-Dimensional Echocardiography for Wall Motion Analysis
A technique using digital two-dimensional echocardiography allows for the visualization and analysis of cardiac wall motion abnormalities. By extracting a curvature function from the endocardial boundary, this method simplifies the identification of infarcted areas, providing a powerful tool for cardiac analysis.
Membrane Finite Element Modeling
Modeling heart wall deformation is challenging due to the complex structure of heart tissue. A membrane finite element approach considers the heart wall as a thick membrane, simplifying the simulation of heart mechanics. This method is applied to a simplified left ventricle geometry, demonstrating its potential for efficient heart mechanics modeling.
Conclusion
The study of heart wall structure and function encompasses various advanced techniques, from MRI and echocardiography to finite element modeling. These methods provide detailed insights into heart wall motion, structural adaptations in athletes, and pathological changes, contributing significantly to both clinical and research applications.
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