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Myocardial tactile stiffness: a variable of regional myocardial function
1Department of Cardiothoracic Surgery, Faculty of Medicine, University of Tokyo, Japan.
Journal of the American College of Cardiology
|April 30, 1998
Summary
A new sensor system accurately measures myocardial tactile stiffness in beating hearts. This innovation provides a reliable method for assessing regional myocardial function, particularly in ischemic or infarcted areas.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Myocardial Mechanics
Background:
- Assessing regional myocardial function is crucial but challenging.
- Existing methods are often complex and invasive for in situ application.
Purpose of the Study:
- Develop and validate a novel sensor system for measuring myocardial tactile stiffness.
- Evaluate its efficacy in estimating regional myocardial function.
Main Methods:
- Monitored myocardial tactile stiffness, ventricular pressure, and volume in dogs.
- Determined the end-systolic tactile stiffness-volume relation (ESSVR) and its correlation with the end-systolic pressure-volume relation (ESPVR).
- Assessed stiffness changes in regional ischemic and infarcted myocardial models.
Main Results:
- Myocardial tactile stiffness exhibited cyclical changes correlating with left ventricular pressure.
- ESSVR demonstrated linearity comparable to ESPVR, with strong correlation over varying contractility.
- Tactile stiffness effectively indexed regional wall or fiber stress.
- Ischemic/infarcted regions showed decreased end-systolic stiffness and increased end-diastolic stiffness.
Conclusions:
- The developed tactile sensor system enables in situ measurement of myocardial tactile stiffness with good temporal resolution.
- Myocardial tactile stiffness serves as a valuable index for evaluating regional myocardial function.