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Related Experiment Videos

Pressure-volume-based single-beat estimations cannot predict left ventricular contractility in vivo.

Knut E Kjørstad1, Christian Korvald, Truls Myrmel

  • 1Department of Thoracic and Cardiovascular Surgery, University Hospital of Tromsø, N-9038 Tromsø, Norway. knutek@fagmed.uit.no

American Journal of Physiology. Heart and Circulatory Physiology
|April 18, 2002
PubMed
Summary

Assessing heart contractility using single pressure-volume loops is challenging. Current single-beat methods for estimating cardiac contractility (elastance) lack the accuracy needed for reliable clinical use.

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Area of Science:

  • Cardiology
  • Physiology
  • Biomedical Engineering

Background:

  • The end-systolic pressure-volume relationship is a key index for evaluating heart contractile state.
  • Clinical application is limited by the need for preload alterations.
  • Developing single pressure-volume loop methods for contractility assessment is an ongoing research area.

Purpose of the Study:

  • To evaluate the accuracy of four different methods for calculating cardiac contractility from a single pressure-volume loop.
  • To compare single-beat contractility estimates with preload-varied multiple-beat elastance.

Main Methods:

  • Utilized combined pressure and conductance catheters in 37 pigs to obtain pressure-volume data.
  • Applied four single-beat contractility estimation methods to 88 steady-state pressure-volume files.

Related Experiment Videos

  • Included data from dopamine infusions to assess contractility changes.

    • Main Results:

    • All evaluated single-beat methods exhibited low average bias but unacceptably high limits of agreement.
    • None of the single-beat methods accurately predicted the increase in contractility observed during dopamine infusion.
    • Multiple-beat elastance showed a significant increase with dopamine, which was not reflected by single-beat methods.

    Conclusions:

    • Current single-beat methods for assessing cardiac contractility are unreliable due to high variability.
    • The clinical utility of these single-beat methods for estimating heart contractility is questionable.
    • Further research is needed to develop accurate single-beat methods for cardiac contractility assessment.