Key Points
- To introduce a ventricular volume analysis framework that relates end-systolic volume directly to end-diastolic volume, providing an alternative to conventional ejection fraction.
- Evaluated left ventricular volume regulation principles using hemodynamic data collected from intact animal experiments and healthy humans.
- Applied volume relationship analyses to individual heart dynamics as well as population cohorts stratified by sex, age, and medication.
- Derived analytical relationships connecting ejection fraction and myocardial oxygen consumption directly to end-systolic volume.
- Directly modeling end-systolic volume against end-diastolic volume eliminated the mathematical artifacts inherent to ratio-based and difference-based metrics like ejection fraction.
- The volume regulation framework effectively characterized sex-specific variations in cardiac dynamics across individuals and ensemble cohorts.
- Formulating myocardial oxygen consumption as a function of end-systolic volume reaffirmed the physiological relevance of the end-systolic elastance framework.
Structured PICO
PPopulationIntact animals and healthy humans (used to illustrate basic principles of ventricular volume regulation)
IInterventionAlternative approach relating end-systolic volume (ESV) to end-diastolic volume
CComparatorTraditional Starling curve and ejection fraction (EF) metrics
OOutcomeDescription of cardiac function and ventricular volume regulationsurrogate
An alternative approach relating end-systolic to end-diastolic volume may provide deeper physiological insights into cardiac mechanics than the traditional ejection fraction.