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Optimal vortex formation as an index of cardiac health
Morteza Gharib1, Edmond Rambod, Arash Kheradvar
1Graduate Aeronautical Laboratories and Bioengineering, California Institute of Technology, Pasadena, CA 91125, USA. mgharib@caltech.edu
Insights
A new dimensionless index measuring vortex formation during early diastole uniquely reflects cardiac health. This novel index correlates with existing measures but does not require patient-specific data for accurate heart failure assessment.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Medical Diagnostics
Background:
- Heart disease is a major global health concern.
- Left ventricular (LV) diastolic function is crucial for cardiac health.
- Current methods struggle to accurately diagnose early-stage heart failure due to the complexity of LV diastole.
Purpose of the Study:
- To introduce a novel index for assessing cardiac health.
- To demonstrate the index's ability to reflect LV function.
- To establish a new, non-invasive diagnostic tool for heart failure.
Main Methods:
- Development of a dimensionless numerical index based on vortex formation optimization during early diastolic filling.
- Correlation of the novel index with established cardiac health metrics like LV ejection fraction.
- Validation of the index in human subjects with normal and pathological cardiac conditions using noninvasive LV measurements.
Main Results:
- The novel index uniquely and sensitively reflects major aspects of cardiac function.
- The index shows strong correlation with existing measures of cardiac health.
- The index successfully distinguishes between healthy and diseased cardiac states without requiring patient-specific data.
Conclusions:
- Optimization of vortex formation during early diastole provides a sensitive indicator of cardiac health.
- This new index offers a simplified, non-invasive method for assessing cardiac function and diagnosing heart failure.
- The index's independence from patient-specific data enhances its potential for widespread clinical application.
Abstract:
Heart disease remains a leading cause of death worldwide. Previous research has indicated that the dynamics of the cardiac left ventricle (LV) during diastolic filling may play a critical role in dictating overall cardiac health. Hence, numerous studies have aimed to predict and evaluate global cardiac health based on quantitative parameters describing LV function. However, the inherent complexity of LV diastole, in its electrical, muscular, and hemodynamic processes, has prevented the development of tools to accurately predict and diagnose heart failure at early stages, when corrective measures are most effective. In this work, it is demonstrated that major aspects of cardiac function are reflected uniquely and sensitively in the optimization of vortex formation in the blood flow during early diastole, as measured by a dimensionless numerical index. This index of optimal vortex formation correlates well with existing measures of cardiac health such as the LV ejection fraction. However, unlike existing measures, this previously undescribed index does not require patient-specific information to determine numerical index values corresponding to normal function. A study of normal and pathological cardiac health in human subjects demonstrates the ability of this global index to distinguish disease states by a straightforward analysis of noninvasive LV measurements.
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