Time-varying elastance models can simulate only the pressure and volume signals in the
heart chambers while the diagnosis of clinical cases and evaluation of different treatment
techniques require more information. In this study, an extended model utilizing the geometric dimensions of the heart chambers was developed to describe the cardiac function. The
new cardiac model was evaluated by simulating a healthy and dilated cardiomyopathy
(DCM) condition for adults and children. The left ventricular ejection fraction, end-diastolic
volume, end-diastolic diameter and diastolic sphericity index were 53.60%, 125 mL, 5.08 cm
and 1.82 in the healthy adult cardiovascular system model and 23.70%, 173 mL, 6.60 cm
and 1.40 in the DCM adult cardiovascular system model. In the healthy child cardiovascular
system model, the left ventricular ejection fraction, end-diastolic volume, end-diastolic diameter and diastolic sphericity index were 59.70%, 92 mL, 4.10 cm and 2.26 respectively and
30.70%, 125 mL, 4.94 cm and 1.87 in the DCM child cardiovascular system model. The
developed cardiovascular system model simulates the hemodynamic variables and clinical
diagnostic indicators within the physiological range for healthy and DCM conditions proving
the feasibility of this new model to evaluate clinical cases in adults and children
