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Left ventricular volume analysis as a basic tool to describe cardiac function.

Peter L M Kerkhof1, Tatiana Kuznetsova2, Rania Ali1

  • 1Amsterdam Cardiovascular Sciences, VU University Medical Center , Amsterdam , The Netherlands.

Advances in Physiology Education
|February 16, 2018
PubMed
Summary

This study introduces a novel method for analyzing cardiac function by relating end-systolic volume to end-diastolic volume, offering a clearer understanding of ventricular regulation beyond traditional ejection fraction metrics.

Keywords:
ejection fractionmodelingmyocardial oxygen consumptionpressure-volume loopsex-specific analysis

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Biomedical Engineering

Background:

  • The heart's function is traditionally assessed using pressure-volume relationships and the Starling curve.
  • Ejection fraction (EF), a ratio of stroke volume to end-diastolic volume, is a widely used clinical metric but has limitations.
  • Existing models often rely on differences or ratios, potentially obscuring underlying mechanics.

Purpose of the Study:

  • To present an alternative approach to cardiac function analysis by focusing on the direct relationship between end-systolic volume (ESV) and end-diastolic volume (EDV).
  • To provide a method that avoids complex ratios and differences, simplifying the interpretation of ventricular volume regulation.
  • To explore sex-specific differences in cardiac mechanics and enable group analysis for clinical stratification.

Main Methods:

  • Utilized data from intact animal experiments and healthy human subjects.
  • Developed a model relating ESV directly to EDV for assessing ventricular volume regulation.
  • Investigated the relationship between EF and ESV, and described myocardial oxygen consumption based on ESV.

Main Results:

  • Demonstrated a new paradigm for ventricular volume regulation by plotting ESV against EDV.
  • Illustrated the applicability of the method to individual hearts and group analyses, including stratification by sex, age, and medication.
  • Showcased how this approach enhances insight into cardiac mechanics and myocardial oxygen consumption, favoring the end-systolic elastance concept.

Conclusions:

  • The proposed ESV-EDV relationship offers a more insightful and direct method for cardiac function analysis compared to traditional EF.
  • This approach simplifies the understanding of ventricular mechanics and has potential for clinical stratification and personalized medicine.
  • The findings support a shift towards concepts like end-systolic elastance for a deeper comprehension of cardiac performance.