RxODE automatically assigns compartment numbers when parsing. For example, with the Mavoglurant PBPK model the following model may be used:
library(RxODE) pbpk <- RxODE({ KbBR = exp(lKbBR) KbMU = exp(lKbMU) KbAD = exp(lKbAD) CLint= exp(lCLint + eta.LClint) KbBO = exp(lKbBO) KbRB = exp(lKbRB) ## Regional blood flows # Cardiac output (L/h) from White et al (1968) CO = (187.00*WT^0.81)*60/1000; QHT = 4.0 *CO/100; QBR = 12.0*CO/100; QMU = 17.0*CO/100; QAD = 5.0 *CO/100; QSK = 5.0 *CO/100; QSP = 3.0 *CO/100; QPA = 1.0 *CO/100; QLI = 25.5*CO/100; QST = 1.0 *CO/100; QGU = 14.0*CO/100; # Hepatic artery blood flow QHA = QLI - (QSP + QPA + QST + QGU); QBO = 5.0 *CO/100; QKI = 19.0*CO/100; QRB = CO - (QHT + QBR + QMU + QAD + QSK + QLI + QBO + QKI); QLU = QHT + QBR + QMU + QAD + QSK + QLI + QBO + QKI + QRB; ## Organs' volumes = organs' weights / organs' density VLU = (0.76 *WT/100)/1.051; VHT = (0.47 *WT/100)/1.030; VBR = (2.00 *WT/100)/1.036; VMU = (40.00*WT/100)/1.041; VAD = (21.42*WT/100)/0.916; VSK = (3.71 *WT/100)/1.116; VSP = (0.26 *WT/100)/1.054; VPA = (0.14 *WT/100)/1.045; VLI = (2.57 *WT/100)/1.040; VST = (0.21 *WT/100)/1.050; VGU = (1.44 *WT/100)/1.043; VBO = (14.29*WT/100)/1.990; VKI = (0.44 *WT/100)/1.050; VAB = (2.81 *WT/100)/1.040; VVB = (5.62 *WT/100)/1.040; VRB = (3.86 *WT/100)/1.040; ## Fixed parameters BP = 0.61; # Blood:plasma partition coefficient fup = 0.028; # Fraction unbound in plasma fub = fup/BP; # Fraction unbound in blood KbLU = exp(0.8334); KbHT = exp(1.1205); KbSK = exp(-.5238); KbSP = exp(0.3224); KbPA = exp(0.3224); KbLI = exp(1.7604); KbST = exp(0.3224); KbGU = exp(1.2026); KbKI = exp(1.3171); ##----------------------------------------- S15 = VVB*BP/1000; C15 = Venous_Blood/S15 ##----------------------------------------- d/dt(Lungs) = QLU*(Venous_Blood/VVB - Lungs/KbLU/VLU); d/dt(Heart) = QHT*(Arterial_Blood/VAB - Heart/KbHT/VHT); d/dt(Brain) = QBR*(Arterial_Blood/VAB - Brain/KbBR/VBR); d/dt(Muscles) = QMU*(Arterial_Blood/VAB - Muscles/KbMU/VMU); d/dt(Adipose) = QAD*(Arterial_Blood/VAB - Adipose/KbAD/VAD); d/dt(Skin) = QSK*(Arterial_Blood/VAB - Skin/KbSK/VSK); d/dt(Spleen) = QSP*(Arterial_Blood/VAB - Spleen/KbSP/VSP); d/dt(Pancreas) = QPA*(Arterial_Blood/VAB - Pancreas/KbPA/VPA); d/dt(Liver) = QHA*Arterial_Blood/VAB + QSP*Spleen/KbSP/VSP + QPA*Pancreas/KbPA/VPA + QST*Stomach/KbST/VST + QGU*Gut/KbGU/VGU - CLint*fub*Liver/KbLI/VLI - QLI*Liver/KbLI/VLI; d/dt(Stomach) = QST*(Arterial_Blood/VAB - Stomach/KbST/VST); d/dt(Gut) = QGU*(Arterial_Blood/VAB - Gut/KbGU/VGU); d/dt(Bones) = QBO*(Arterial_Blood/VAB - Bones/KbBO/VBO); d/dt(Kidneys) = QKI*(Arterial_Blood/VAB - Kidneys/KbKI/VKI); d/dt(Arterial_Blood) = QLU*(Lungs/KbLU/VLU - Arterial_Blood/VAB); d/dt(Venous_Blood) = QHT*Heart/KbHT/VHT + QBR*Brain/KbBR/VBR + QMU*Muscles/KbMU/VMU + QAD*Adipose/KbAD/VAD + QSK*Skin/KbSK/VSK + QLI*Liver/KbLI/VLI + QBO*Bones/KbBO/VBO + QKI*Kidneys/KbKI/VKI + QRB*Rest_of_Body/KbRB/VRB - QLU*Venous_Blood/VVB; d/dt(Rest_of_Body) = QRB*(Arterial_Blood/VAB - Rest_of_Body/KbRB/VRB); })
If you look at the summary, you can see where RxODE assigned the compartment number(s)
summary(pbpk)
In this case, Venous_Blood
is assigned to compartment 15
.
Figuring this out can be inconvenient and also lead to re-numbering
compartment in simulation or estimation datasets. While it is easy and
probably clearer to specify the compartment by
name, other tools only support compartment
numbers. Therefore, having a way to number compartment easily can
lead to less data modification between multiple tools.
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