An alternative to time-varying elastance descriptions of the heart

Analytical models of the cardiovascular system typically use time-varying elastance descriptions of the heart chambers, e.g. the left ventricle. These elastance functions are derived from volume and pressure data. Consequently, although they are used to characterize the ventricle alone, their origin makes them characteristic of a particular ventricle and arterial load combination. This inability to separate source and load is eliminated by a new ventricle model based on a volume and time dependent isovolumic pressure function, derived from animal experiments.