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Related Experiment Videos

Compression of interventricular septum during right ventricular pressure loading.

G S Nelson1, E Y Sayed-Ahmed, C A Kroeker

  • 1Departments of Medicine, Physiology and Biophysics and Civil Engineering, University of Calgary, Calgary, Alberta T2N 4N1, Canada.

American Journal of Physiology. Heart and Circulatory Physiology
|May 18, 2001
PubMed
Summary

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The interventricular septum experiences compressive stresses during pulmonary artery constriction, challenging the membrane theory. These stresses may contribute to septal ischemia in certain heart conditions.

Area of Science:

  • Cardiovascular Physiology
  • Biomechanical Engineering

Background:

  • The interventricular septum's mechanics are often simplified to a membrane model.
  • Abnormal septal motion occurs in conditions like pulmonary hypertension.

Purpose of the Study:

  • To investigate mechanical stresses in the interventricular septum under abnormal loading.
  • To determine if the septum behaves as a membrane or exhibits bending and compression.

Main Methods:

  • Developed a 2D finite element model of the interventricular septum.
  • Used hemodynamic and echocardiographic data from canine models.
  • Applied measured ventricular pressures to the model under control and pulmonary artery constriction.

Main Results:

Related Experiment Videos

  • End-bending moments were necessary to model the septum during pulmonary artery constriction, but not in control conditions.
  • Significant circumferential compressive stresses developed in the septum during pulmonary artery constriction.
  • Results contradict the unstressed membrane hypothesis.

    • Conclusions:

    • The interventricular septum exhibits complex mechanical behavior beyond a simple membrane.
    • Compressive stresses in the septum may play a role in unexplained ischemia.
    • Finite element modeling provides insights into cardiac mechanics under altered loading conditions.