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The physiological basis of left ventricular diastolic dysfunction.

C S Apstein1, B H Lorell

  • 1Cardiac Muscle Research Laboratory, Boston University School of Medicine, MA 02118.

Journal of Cardiac Surgery
|December 1, 1988
PubMed
Summary
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Diastolic dysfunction, a key factor in cardiac pump failure, arises from impaired myocardial relaxation. This condition is prevalent in hypertrophy and ischemia, impacting overall heart function.

Area of Science:

  • Cardiology
  • Physiology

Background:

  • Cardiac pump function depends on both systolic ejection and diastolic filling.
  • Diastolic dysfunction, characterized by abnormal myocardial relaxation, is observed in conditions like hypertrophy, ischemia, and post-cardiac surgery.

Purpose of the Study:

  • To elucidate the mechanisms and clinical relevance of diastolic dysfunction.
  • To differentiate diastolic from systolic dysfunction using diagnostic tools.

Main Methods:

  • Analysis of pressure-volume loops.
  • Echocardiography and nuclear cardiology gated blood pool scans for distinguishing diastolic and systolic dysfunction.

Main Results:

  • Diastolic dysfunction can stem from structural changes (e.g., hypertrophy, fibrosis) or dynamic factors (e.g., hypoxia, altered calcium levels).

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  • Hypertrophied myocardium exhibits increased susceptibility to diastolic dysfunction due to structural alterations and heightened sensitivity to ischemia.

    • Conclusions:

    • Diastolic dysfunction is a significant contributor to impaired cardiac function.
    • Understanding the mechanisms of diastolic dysfunction is crucial for managing various cardiac conditions, particularly in hypertrophied hearts.