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Related Experiment Videos

Evaluation of left ventricular functional status using thermodynamic indices

K S Hsieh1, C T Hu, C K Chang

  • 1Department of Pediatrics, Veterans General Hospital-Kaohsiung, Taipei, Taiwan.

Proceedings of the National Science Council, Republic of China. Part B, Life Sciences
|October 1, 1993
PubMed
Summary

This study introduces thermodynamic principles to assess left ventricular contractility, offering a novel alternative to conventional mechanical methods. New thermodynamic indices like ARPD showed significant sensitivity to preload and inotropic stimulation, outperforming dP/dt.

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Area of Science:

  • Cardiovascular Physiology
  • Biophysics
  • Thermodynamics

Background:

  • Conventional assessment of cardiac contractility relies on mechanical properties of the myocardium.
  • Existing methods present theoretical and practical limitations.
  • Thermodynamic principles offer a potential alternative for evaluating cardiac function.

Purpose of the Study:

  • To evaluate left ventricular contractile status using thermodynamic principles.
  • To compare novel thermodynamic indices with the conventional index (dP/dt).
  • To assess the sensitivity of thermodynamic parameters to changes in preload, afterload, and inotropy.

Main Methods:

  • Utilized 8 anesthetized mongrel dogs with artificial ventilation.
  • Inserted a Millar catheter to record simultaneous aortic flow and pressure.

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  • Administered dobutamine for inotropic stimulation, angiotensin for afterload augmentation, and dextran for preload increase.
  • Calculated thermodynamic parameters: ARPD, PREP, APD, and FARPD.

    • Main Results:

    • ARPD, FARPD, and dP/dt decreased significantly with increased afterload.
    • ARPD demonstrated high sensitivity to preload changes (p < 0.001), while PREP also changed significantly.
    • Inotropic stimulation markedly increased ARPD, PREP, APD, FARPD, and dP/dt.

    Conclusions:

    • Thermodynamic parameters, particularly ARPD, offer a sensitive and viable method for assessing left ventricular contractility.
    • These novel indices show distinct responses to afterload, preload, and inotropic states.
    • Thermodynamic assessment provides a promising alternative to conventional methods for cardiac contractility evaluation.