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Hand-held, dynamic indentation system for measuring myocardial transverse stiffness

D M Blair1, H R Halperin

  • 1Peter Belfer Cardiac Mechanics Laboratory, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Biomedical Instrumentation & Technology
|November 1, 1996
PubMed
Summary

A new dynamic indentation system accurately estimates myocardial wall stress in the heart. This tool helps differentiate muscle from loading abnormalities, aiding in understanding cardiac conditions and surgical planning.

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Area of Science:

  • Cardiovascular Research
  • Biomedical Engineering
  • Medical Device Development

Background:

  • Myocardial abnormalities and altered regional loading are key factors in heart disease progression, including infarct expansion, remodeling, cardiomyopathy, and arrhythmias.
  • Accurate estimation of regional wall stress is crucial for distinguishing between primary muscle and loading abnormalities in the heart.
  • Previous methods using geometric models and finite element analysis for wall stress estimation lacked validation.

Purpose of the Study:

  • To develop and validate a novel hand-held dynamic indentation system for measuring regional myocardial wall stress.
  • To enable rapid and accurate assessment of transverse stiffness, a surrogate for myocardial wall stress, in intact hearts.

Main Methods:

  • A hand-held dynamic indentation system was designed to measure the transverse stiffness of cardiac muscle.

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  • The system was validated using finite-element analysis and direct measurements on isolated heart muscle and non-biologic materials.
  • The device can perform multiple estimations of wall stress within a single cardiac contraction cycle (15 milliseconds).

    • Main Results:

    • The dynamic indentation system accurately estimates myocardial wall stress.
    • Validation confirmed the system's reliability across various materials and conditions.
    • The system allows for real-time, regional assessment of cardiac mechanical properties.

    Conclusions:

    • The validated dynamic indentation system provides an accurate method for estimating regional myocardial wall stress.
    • This technology can significantly improve the understanding of cardiac pathophysiology and guide therapeutic interventions.
    • The sensor has potential applications in surgical planning for cardiac procedures and advancing cardiovascular research.