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Related Experiment Videos

Left and right ventricular diastolic function during acute pericardial tamponade.

O A Smiseth1, M A Frais, M Junemann

  • 1Department of Medicine, University of Calgary, Canada.

Clinical Physiology (Oxford, England)
|January 1, 1991
PubMed
Summary

Pericardial tamponade shifts cardiac pressure-volume relations by increasing pericardial pressure, without altering myocardial compliance. Volume expansion during tamponade minimally impacts left and right ventricular volumes.

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Area of Science:

  • Cardiology
  • Physiology

Background:

  • Pericardial tamponade significantly impacts cardiac function.
  • Understanding pressure-volume (P-V) relations is crucial for assessing cardiac performance.

Purpose of the Study:

  • To investigate the effects of acute pericardial tamponade on left ventricular (LV) and right ventricular (RV) intracavitary and transmural P-V relations.
  • To evaluate how changes in blood volume during tamponade influence LV and RV volumes.

Main Methods:

  • Experiments conducted on 11 anesthetized dogs.
  • LV and RV volumes measured using computed tomography (CT) or sonomicrometry for diameter.
  • Pressures measured in the pericardium, aorta, and ventricles; pericardial infusion used to induce tamponade.

Main Results:

Related Experiment Videos

  • Pericardial tamponade caused a left and upward shift in LV and RV intracavitary P-V relations, attributed to increased pericardial pressure (PP).
  • No change was observed in LV and RV transmural P-V relations, indicating preserved myocardial compliance.
  • Blood volume expansion during tamponade resulted in minimal increases in LV and RV volumes.

Conclusions:

  • Acute pericardial tamponade alters intracavitary diastolic P-V relations due to elevated PP.
  • Myocardial compliance remains unchanged during tamponade.
  • Volume loading is minimally effective in increasing ventricular volumes under tamponade conditions.