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Lumped-Parameter and Finite Element Modeling of Heart Failure with Preserved Ejection Fraction
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Combined effect of the force-frequency and length-tension mechanisms on left ventricular function in patients with

Mario Petretta1, Maria L E Vicario, Letizia Spinelli

  • 1Department of Internal Medicine, Cardiology and Heart Surgery, Federico II University of Naples, 80131 Naples, Italy.

European Journal of Heart Failure
|November 28, 2002
PubMed

Insights

Increasing heart rate during left ventricular distension improves heart function in healthy individuals but harms patients with dilated cardiomyopathy (DCM). This study explores the interaction between myocardial length-tension and force-frequency relations in regulating heart contractility.

Area of Science:

  • Cardiology
  • Physiology

Background:

  • The heart's contractile strength is regulated by myocardial length-tension and force-frequency relations.
  • Understanding these mechanisms is crucial for cardiac health.

Purpose of the Study:

  • To investigate the combined effects of myocardial length-tension and force-frequency relations on human left ventricular function.
  • To compare these effects in healthy controls and patients with dilated cardiomyopathy (DCM).

Main Methods:

  • Radionuclide monitoring assessed left ventricular function in 8 DCM patients and 6 controls.
  • Interventions included atrial pacing, saline loading, and combined pacing with volume expansion.

Main Results:

  • In controls, atrial pacing and volume expansion improved ejection fraction and reduced ventricular volumes.
  • In DCM patients, atrial pacing and volume expansion reduced ejection fraction and increased end-systolic volume.
  • A significant 'pacing by load' interaction demonstrated detrimental effects in DCM patients.

Conclusions:

  • Increased heart rate during left ventricular distension enhances ventricular function in healthy individuals.
  • This intervention has adverse effects on ventricular function in patients with DCM, highlighting disease-specific responses.
Abstract

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