Model is underconstrained. The following variables couldn't be defined: * i_Na in component fast_sodium_current * i_Ca in component L_type_Ca_current * i_Ca_K in component L_type_Ca_current * i_Kr in component rapid_activating_delayed_rectifiyer_K_current * i_Ks in component slow_activating_delayed_rectifiyer_K_current * i_to1 in component transient_outward_potassium_current * i_K1 in component time_independent_potassium_current * i_Kp in component plateau_potassium_current * i_NaCa in component Na_Ca_exchanger * i_NaK in component sodium_potassium_pump * i_p_Ca in component sarcolemmal_calcium_pump * i_Ca_b in component calcium_background_current * i_Na_b in component sodium_background_current * E_Na in component fast_sodium_current * alpha_m in component fast_sodium_current_m_gate * beta_m in component fast_sodium_current_m_gate * alpha_h in component fast_sodium_current_h_gate * beta_h in component fast_sodium_current_h_gate * alpha_j in component fast_sodium_current_j_gate * beta_j in component fast_sodium_current_j_gate * E_K in component rapid_activating_delayed_rectifiyer_K_current * R_V in component rapid_activating_delayed_rectifiyer_K_current * K12 in component rapid_activating_delayed_rectifiyer_K_current_X_kr_gate * K21 in component rapid_activating_delayed_rectifiyer_K_current_X_kr_gate * E_Ks in component slow_activating_delayed_rectifiyer_K_current * tau_X_ks in component slow_activating_delayed_rectifiyer_K_current_X_ks_gate * X_ks_infinity in component slow_activating_delayed_rectifiyer_K_current_X_ks_gate * i_Kv4_3 in component Kv4_3_current * i_Kv1_4 in component Kv1_4_current * g_Kv4_3 in component Kv4_3_current * P_open in component Kv4_3_current * P_C0 in component Kv4_3_current * i_Kv1_4_K in component Kv1_4_current * i_Kv1_4_Na in component Kv1_4_current * alpha in component Kv1_4_current * P_open in component Kv1_4_current * K1_infinity_V in component time_independent_potassium_current_K1_gate * Kp_V in component plateau_potassium_current_Kp_gate * f_NaK in component sodium_potassium_pump * E_Ca in component calcium_background_current * p_k in component L_type_Ca_current * i_Ca_max in component L_type_Ca_current * alpha in component L_type_Ca_current * beta in component L_type_Ca_current * gamma in component L_type_Ca_current * alpha_a in component L_type_Ca_current * beta_b in component L_type_Ca_current * y_infinity in component L_type_Ca_current_y_gate * tau_y in component L_type_Ca_current_y_gate * J_rel in component RyR_channel * J_up in component SERCA2a_pump * fb in component SERCA2a_pump * rb in component SERCA2a_pump * J_tr in component intracellular_Ca_fluxes * J_xfer in component intracellular_Ca_fluxes * J_trpn in component intracellular_Ca_fluxes * J_HTRPNCa in component intracellular_Ca_fluxes * J_LTRPNCa in component intracellular_Ca_fluxes * beta_i in component intracellular_ion_concentrations * beta_SS in component intracellular_ion_concentrations * beta_JSR in component intracellular_ion_concentrations * d/dt V in component membrane * d/dt m in component fast_sodium_current_m_gate * d/dt h in component fast_sodium_current_h_gate * d/dt j in component fast_sodium_current_j_gate * d/dt X_kr in component rapid_activating_delayed_rectifiyer_K_current_X_kr_gate * d/dt X_ks in component slow_activating_delayed_rectifiyer_K_current_X_ks_gate * d/dt P_C0 in component Kv4_3_current * d/dt P_C1 in component Kv4_3_current * d/dt P_C2 in component Kv4_3_current * d/dt P_C3 in component Kv4_3_current * d/dt P_O in component Kv4_3_current * d/dt P_CI0 in component Kv4_3_current * d/dt P_CI1 in component Kv4_3_current * d/dt P_CI2 in component Kv4_3_current * d/dt P_CI3 in component Kv4_3_current * d/dt P_OI in component Kv4_3_current * d/dt P_C0 in component Kv1_4_current * d/dt P_C1 in component Kv1_4_current * d/dt P_C2 in component Kv1_4_current * d/dt P_C3 in component Kv1_4_current * d/dt P_O in component Kv1_4_current * d/dt P_CI0 in component Kv1_4_current * d/dt P_CI1 in component Kv1_4_current * d/dt P_CI2 in component Kv1_4_current * d/dt P_CI3 in component Kv1_4_current * d/dt P_OI in component Kv1_4_current * d/dt C0 in component L_type_Ca_current * d/dt C1 in component L_type_Ca_current * d/dt C2 in component L_type_Ca_current * d/dt C3 in component L_type_Ca_current * d/dt C4 in component L_type_Ca_current * d/dt O in component L_type_Ca_current * d/dt C_Ca0 in component L_type_Ca_current * d/dt C_Ca1 in component L_type_Ca_current * d/dt C_Ca2 in component L_type_Ca_current * d/dt C_Ca3 in component L_type_Ca_current * d/dt C_Ca4 in component L_type_Ca_current * d/dt O_Ca in component L_type_Ca_current * d/dt y in component L_type_Ca_current_y_gate * d/dt P_C1 in component RyR_channel * d/dt P_O1 in component RyR_channel * d/dt P_O2 in component RyR_channel * d/dt P_C2 in component RyR_channel * d/dt HTRPNCa in component intracellular_Ca_fluxes * d/dt LTRPNCa in component intracellular_Ca_fluxes * d/dt Cai in component intracellular_ion_concentrations * d/dt Nai in component intracellular_ion_concentrations * d/dt Ki in component intracellular_ion_concentrations * d/dt Ca_ss in component intracellular_ion_concentrations * d/dt Ca_JSR in component intracellular_ion_concentrations * d/dt Ca_NSR in component intracellular_ion_concentrations