Related Experiment Videos
Two-dimensional echocardiographic evaluation of right ventricular function during left heart bypass
Journal of Cardiography
|December 1, 1985
Summary
Left heart bypass (LHB) significantly impairs right ventricular (RV) function and wall motion. Maintaining LHB flow around 75% is optimal for preserving cardiac function, especially the right heart.
Area of Science:
- Cardiovascular Physiology
- Cardiac Surgery
Background:
- Left heart bypass (LHB) is a critical procedure in cardiac surgery.
- Understanding its impact on right ventricular (RV) function is essential for patient outcomes.
Purpose of the Study:
- To investigate the effects of varying left heart bypass (LHB) flow ratios on right ventricular (RV) hemodynamics and wall motion.
- To determine the optimal LHB flow ratio for maintaining cardiac function.
Main Methods:
- Utilized left heart bypass (LHB) in 14 mongrel dogs with a centrifugal blood pump.
- Analyzed RV wall motion using two-dimensional echocardiography (2D-echo) at LHB flow ratios of 0%, 25%, 50%, 75%, and 85-100%.
Main Results:
- Segmental shortening of the interventricular septum (IVS) decreased significantly with increasing LHB flow.
- Maximum LHB flow (85-100%) resulted in akinesis of the IVS and depression of RV free wall motion.
- Left ventricular cavity was obliterated, RV volume increased, and RV ejection fraction decreased at maximum LHB flow.
Conclusions:
- Excessive or prolonged LHB compromises RV wall motion and can lead to right heart failure.
- An LHB flow ratio of approximately 75% appears optimal for preserving overall cardiac function, particularly RV function.