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Related Experiment Videos

Factors influencing late right ventricular ejection.

V Raizada1, D J Sahn, J W Covell

  • 1Department of Medicine and Cardiology, University of New Mexico, Albuquerque 87131.

Cardiovascular Research
|April 1, 1988
PubMed
Summary

Right ventricular ejection continues after free wall contraction ends. This study shows continued apex-to-base shortening of the right ventricular free wall drives late ejection, not septal movement.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Ventricular Ejection Dynamics

Background:

  • Pulmonary artery forward flow extends beyond right ventricular free wall contraction.
  • Mechanisms for late right ventricular ejection remain unclear, with hypotheses including blood flow momentum, regional free wall contraction, and septal motion.

Purpose of the Study:

  • To investigate the mechanisms regulating late right ventricular ejection.
  • To quantify right ventricular free wall shortening and free wall-to-septum dynamics during ejection.

Main Methods:

  • Sonomicrometry was used to measure changes in right ventricular free wall shortening (inflow/outflow regions, hoop/apex-to-base axes) and free wall-to-septum distance.
  • Pulmonary artery flow was measured simultaneously using an electromagnetic flowmeter.

Main Results:

  • Right ventricular free wall in the hoop axis was motionless during late ejection; inflow segments lengthened post-shortening.
  • Shortening in the apex-to-base axis and decreased free wall-to-septum distance continued until ejection end.
  • Inflow segments exhibited longer shortening duration than outflow segments.

Conclusions:

  • Late right ventricular ejection is associated with sustained apex-to-base free wall shortening.
  • The role of the interventricular septum's bulge into the right ventricle during late ejection cannot be excluded.

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