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Related Experiment Videos

The force-interval relationship in human myocardium

U Schmidt1, R J Hajjar, J K Gwathmey

  • 1Cardiovascular Diseases and Muscle Research Laboratories, Beth Israel Hospital, Harvard Medical School, Boston, MA 02115, USA.

Journal of Cardiac Failure
|September 1, 1995
PubMed
Summary
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Patients with dilated cardiomyopathy exhibit an abnormal force-interval relationship, where increased stimulation frequency does not enhance cardiac contractility. This dysfunction is linked to impaired intracellular calcium handling and sarcoplasmic reticulum function.

Area of Science:

  • Cardiovascular Physiology
  • Cardiac Muscle Mechanics
  • Heart Failure Pathophysiology

Background:

  • The force-interval relationship critically modulates myocardial contractility.
  • In healthy hearts, increased stimulation frequency typically enhances contraction force.
  • Dilated cardiomyopathy is associated with alterations in this relationship.

Purpose of the Study:

  • To investigate the force-interval relationship in normal and failing human hearts.
  • To examine the impact of stimulation frequency on myocardial contractility in dilated cardiomyopathy.
  • To understand the role of intracellular calcium cycling in this phenomenon.

Main Methods:

  • Analysis of atrial pacing effects in human subjects and isolated heart preparations.

Related Experiment Videos

  • In vivo and in vitro investigations of myocardial contractility.
  • Assessment of intracellular calcium dynamics and sarcoplasmic reticulum function.

    • Main Results:

    • Patients with dilated cardiomyopathy consistently show an abnormal force-interval relationship.
    • Increased stimulation frequency failed to augment contractile response in failing hearts.
    • This abnormality correlates with impaired intracellular calcium cycling and sarcoplasmic reticulum function.

    Conclusions:

    • The force-interval relationship in dilated cardiomyopathy reflects underlying defects in excitation-contraction coupling.
    • Sarcoplasmic reticulum function and intracellular calcium mobilization are key targets for therapeutic intervention.
    • Restoring normal calcium handling may improve contractile function in heart failure.