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The influence of hemodilution on left ventricular function
G Kouraklis1, P Karayannacos, M Sechas
12nd Department of Propedeutic Surgery, Faculty of Medicine, School of Health Science, University of Athens, Greece.
Insights
Moderate isovolemic hemodilution in dogs did not impair left ventricular function. Hemodynamic and electrocardiographic findings remained unchanged, indicating preserved cardiac performance despite reduced hemoglobin.
Area of Science:
- Cardiovascular Physiology
- Hemodynamics
- Anesthesiology
Background:
- Isovolimic hemodilution is a technique used to reduce blood viscosity and improve microcirculatory flow.
- Understanding the impact of hemodilution on cardiac function is crucial for managing patients with anemia or during surgical procedures.
Purpose of the Study:
- To investigate the effects of progressive isovolemic hemodilution on left ventricular function in healthy dogs.
- To assess hemodynamic and electrocardiographic changes during induced anemia.
Main Methods:
- Anemia was induced in nine mongrel dogs via blood exchange with a plasma substitute.
- Continuous monitoring of aortic, atrial, and ventricular pressures, cardiac output, and ECG.
- Blood samples analyzed for hemoglobin, blood gases, and whole blood viscosity.
Main Results:
- Progressive hemodilution significantly increased cardiac output and left ventricular stroke work.
- Total peripheral resistance, oxygen content, and whole blood viscosity decreased significantly.
- No significant changes were observed in cardiac pressures, myocardial contractility, or blood gases.
Conclusions:
- Moderate isovolemic hemodilution does not impair left ventricular function in animals with normal coronary arteries.
- Hemodynamic and electrocardiographic parameters remain stable, suggesting preserved cardiac performance.
- The study supports the safety of moderate hemodilution in maintaining cardiac function under specific physiological conditions.
Abstract:
In nine anesthetized mongrel dogs anemia was produced by exchanging blood with plasma substitute thus reducing hemoglobin gradually in three steps. Aortic, atrial and ventricular blood pressures, cardiac output, electrocardiogram, phonocardiogram and the first derivative of the left ventricular pressure were continuously monitored. Blood samples were taken to determine hemoglobin, blood gases and whole blood viscosity. Progressive hemodilution resulted in a significant increase in cardiac output and left ventricular stroke work, while total peripheral resistance, oxygen content and whole blood viscosity decreased significantly. There were no significant changes in cardiac pressures, myocardial contractility, diastolic pressure time index and blood gases. The oxygen supply/demand ratio had gradually declined, while electrocardiogram showed no significant changes. These results suggest that moderate isovolemic hemodilution in animals with normal coronary vessels does not impair left ventricular function as this was manifested by the unchanged hemodynamic and electrocardiographic findings.