The model is first passively inflated during the diastasis and atrial contraction phase.
During the isovolumic phases a cavity region is included and coupled to the wall region. The isovolumic contraction is simulated by incrementing active fibre tension (incrementing the CA parameter). The coupling with the incompressible cavity region results in an increased cavity pressure.
The rapid ejection phase is simulated by incrementing the pressure. At each pressure increment a specified volume is given in a file. The CA parameter (active fiber tension) is adjusted to obtain the desired volume. The pressure-volume relationship may be changed to e.g. a Windkessel-model by adjusting the values in the file.
The reduced ejection phase is simulated by keeping CA constant and reducing the pressure slightly.
Isovolumic relaxation is simulated similarly to IVC.
The rapid filling phase is simulated by reducing the CA and pressures down to 0.
Created by Espen Remme May 2004.