The electric analogue showes the pulmonary arteries compartment modelled with RL (R_wpua and L_wpua) elements and 4-MW element (R_pua, L_pua, R_Vpua and C_pua). R_pua (R_wpua) is the pulmonary (wedge) artery resistance; L_pua (L_wpua) is the pulmonary (wedge) artery inertance; C_pua is the pulmonary arteries compliance and R_Vpua [mmHg·cm^-3·sec] is the viscoelastance of the pulmonary arteries vessels. Pulmonary capillary section is reproduced using two 4-MW elements: R_wpuc, L_wpuc, C_wpuc R_Vwpuc are the pulmonary capillary wedge resistance, inertance, compliance and viscoelastance; R_puc [mmHg·cm^-3·sec], L_puc [mmHg·cm^-3·sec²], C_puc [cm³·mmHg^-1] and R_Vpuc are the pulmonary capillary resistance, inertance, compliance and viscoelastance. The R_pua value is influenced by respiratory system directly.

The pulmonary veins compartment is modelled with 4-MW elements: C_puv (C_wpuv) [cm³·mmHg^-1], R_puv (R_wpuv) [mmHg·cm^-3·sec],  L_puv (L_wpuv) [mmHg·cm^-3·sec2] and R_Vpuv (R_Vwpuv) are the pulmonary (wedge) veins compliance, resistance, inertance and viscoelastance respectively. The  R_puv  value is influenced by the respiratory system. QT+Q_RVwpuc+Q_RVwpuv represents the input blood flow to the vena cava circulation, Q_puv+Q_wpuw is the input blood floe to the left atrium. P_puv (P_wpuv) is the pulmonary (wedge) vein pressure.

The systemic veins and vena cava sections are modelled with 4-MW elements. L_VS (L_VC), R_VS (R_VC), C_VS (C_VC) and R_Vvs (R_Vvc) are the systemic veins (vena cava) inertance, resistance, compliance and viscoelastance respectively. P_VC (P_VS) is the vena cava (systemic veins) pressure. Q_ca, is the blood flow from carotid arteries compartment (see Systemic Network 5), QRva is the the part of blood folow from peripheral arteries, Q_RVaa (Q_RVda) is the part of flow from ascending (descending) aorta.

Equations solving the electric analogue.

Equations solving the electric analogue.

Equations solving the electric analogue. Parameters are described in the next slide.