Factors influencing the diastolic pressure-volume relation of the cardiac ventricles
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Ventricular diastolic pressure-volume relationships are key to understanding heart chamber properties. Factors like heart rate and arterial pressure have minor effects, but ventricular interaction and pericardium significantly influence diastolic function.
Area of Science:
- Cardiovascular Physiology
- Cardiac Mechanics
Background:
- The diastolic pressure-volume relationship is a fundamental measure of ventricular chamber properties.
- Myocardial mechanical properties largely determine this relationship, but external physiological factors also play a role.
Purpose of the Study:
- To review the influence of key physiological factors on the diastolic pressure-volume relationship.
- To highlight factors critical for accurate assessment of cardiac diastolic function.
Main Methods:
- Literature review of physiological factors affecting diastolic pressure-volume relationships.
- Analysis of the impact of heart rate, arterial pressure, coronary perfusion pressure, pericardium, and ventricular interdependence.
Main Results:
- Heart rate, arterial pressure, and coronary perfusion pressure have minor influences within physiological ranges.
- Ventricular interdependence, especially with the pericardium, significantly impacts diastolic pressure-volume dynamics.
Conclusions:
- Understanding these influencing factors is crucial for interpreting diastolic pressure-volume data.
- Accurate assessment of myocardial mechanical properties relies on accounting for these physiological interactions.
Abstract:
The diastolic pressure-volume relationship of either ventricle is a direct measure of the properties of its chamber. While this relation is, to a large extent, determined by the myocardium and its mechanical properties, there are a number of physiological factors that are also capable of influencing the diastolic pressure-volume-relation. This review examines our current understanding of the importance of a number of these factors with respect to the diastolic properties of the chamber. The factors discussed are heart rate, arterial pressure, coronary perfusion pressure, the pericardium, and the mechanical interplay between ventricles. The influence of heart rate, arterial pressure, and coronary perfusion pressure can be considered as minor provided they remain within their normal physiological range. On the other hand, the diastolic pressure-volume relation is highly dependent on the volume in the other ventricle, particularly in the presence of the pericardium. An awareness and understanding of the interrelationship between these factors and the diastolic pressure-volume relation is essential when evaluating the properties of the chamber and when such pressure-volume data are used to estimate the mechanical properties of the myocardium.