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Related Experiment Videos

Hemodynamic effects of atrial interaction

J A Goldstein1, J S Tweddell, B Barzilai

  • 1Cardiovascular Division, Washington University School of Medicine, St. Louis, MO 63110.

Coronary Artery Disease
|June 1, 1993
PubMed
Summary

Atrial pressure and waveform changes transmit across the interatrial septum, influencing cardiac function. This study investigated these interactions in dogs during induced pressure and volume overload.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology

Background:

  • Ventricular interactions occur via the interventricular septum.
  • The role of interatrial septum in atrial interactions is less understood.

Purpose of the Study:

  • To determine if atrial interactions manifest across the interatrial septum.
  • To investigate transmission of hemodynamic changes between atria.

Main Methods:

  • Micromanometer-tipped catheters measured right atrial (RA) and left atrial (LA) pressures in dogs.
  • Pressure and volume overload induced via sequential right ventricular (RV), RA, and septal ischemia.

Main Results:

  • RV ischemia increased RA pressure and enhanced RA contraction/relaxation; LA pressure also increased with enhanced waves.

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  • RA ischemia depressed RA contraction/relaxation, with parallel changes in LA.
  • Septal ischemia enhanced LA contraction/relaxation, with increased RA waveform components despite RA ischemia.

    • Conclusions:

    • Demonstrated interatrial transmission of pressure and waveform changes.
    • These interactions can influence hemodynamic evaluation and cardiac function.