Related Experiment Videos
[The effect of peripheral reflections on the left ventricle]
R Zannoli1, P Schiereck, P Ortolani
1Istituto di Malattie dell'Apparato Cardiovascolare, Università degli Studi, Bologna.
Cardiologia (Rome, Italy)
|October 1, 1992
Summary
Altering reflection timing in isolated rabbit hearts reduced stroke volume and external work. This demonstrates how aortic stiffness negatively impacts cardiac output and coronary perfusion.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
Context:
- Understanding the impact of vascular reflections on cardiac function is crucial.
- Vascular stiffness, a common clinical finding, can alter hemodynamic responses.
Purpose:
- To investigate how altered timing of reflected pressure waves affects ventricular performance in an isolated heart model.
- To quantify changes in stroke volume, ventricular work, and coronary perfusion pressure due to early reflected pulse arrival.
Summary:
- Isolated rabbit hearts were subjected to varying hydraulic load conditions simulating altered reflection timing.
- Measurements of ventricular and aortic pressure, and aortic flow were analyzed to calculate performance parameters.
- Anticipation of reflected pulses led to significant decreases in stroke volume (-14.5%), external ventricular work (-21%), and mean coronary perfusion pressure (-28%).
Impact:
- Findings suggest that increased aortic stiffness has detrimental effects on cardiac output and ventricular efficiency.
- Reduced coronary perfusion pressure due to altered reflections may compromise myocardial blood flow.
- This study provides insights into the mechanisms by which vascular properties influence overall cardiac performance and organ perfusion.