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Related Experiment Videos

Altered force-frequency relation in hypertrophic obstructive cardiomyopathy.

U Schotten1, S Voss, T B Wiederin

  • 1Dept. of Cardiology, University Hospital Aachen, Germany.

Basic Research in Cardiology
|May 18, 1999
PubMed
Summary
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In hypertrophic obstructive cardiomyopathy (HOCM), heart muscle struggles to increase contraction force with faster rates at normal calcium levels. This impaired force-frequency relation suggests abnormal cellular calcium handling contributes to dysfunction.

Area of Science:

  • Cardiology
  • Physiology
  • Biochemistry

Background:

  • Hypertrophic obstructive cardiomyopathy (HOCM) is characterized by myocardial hypertrophy and can lead to diastolic dysfunction.
  • The force-frequency relationship (FFR), describing how contraction force changes with stimulation rate, is crucial for cardiac function.
  • Reduced contractile reserve in HOCM may contribute to myocardial dysfunction, but the underlying mechanisms require further investigation.

Purpose of the Study:

  • To test the hypothesis that impaired frequency-dependent potentiation of contraction force contributes to myocardial dysfunction in HOCM.
  • To investigate the force-frequency relationship in hypertrophied myocardium from HOCM patients compared to non-failing donor hearts.
  • To explore the role of extracellular calcium concentration in modulating the force-frequency relationship in HOCM.

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Main Methods:

  • Myocardial tissue samples were obtained from 8 HOCM patients post-myectomy and 3 organ donors.
  • Thin myocardial strips were subjected to varying stimulation frequencies (0.5-3.0 Hz) and extracellular calcium concentrations (1.8-16.2 mmol/l).
  • Isometric force development and relaxation dynamics were measured to assess inotropic responses.

Main Results:

  • At physiological calcium (1.8 mmol/l), HOCM myocardium showed no positive inotropic effect with increased stimulation frequency, unlike control myocardium.
  • Increasing extracellular calcium concentration induced a positive FFR in HOCM, peaking at 5.4 mmol/l.
  • Higher calcium levels (16.2 mmol/l) resulted in a negative FFR in HOCM, and faster rates shortened contraction and relaxation times in all groups.

Conclusions:

  • Hypertrophied myocardium in HOCM patients exhibits a blunted positive force-frequency relationship at physiological calcium concentrations.
  • The ability to induce a positive FFR with elevated calcium suggests abnormal cellular calcium handling is a key pathophysiological factor in HOCM.
  • These findings highlight the critical role of calcium dysregulation in the contractile dysfunction observed in HOCM.