Cardiac_output-Simple_Model_01_01

Cardiac_output-Simple_Model_01_01 preview image

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globals [                  ;; setting the globals for the model functioning:
  count-down               ;; timer for the cardiac driving function
  tve                      ;; the time varying elastance
  list-p                   ;; the list for turtles coordinates (pressure)
  list-v                   ;; the list for turtles coordinates (volume)
  HR-f                     ;; factor for 'balancing' heart rate and dt
  k                        ;; scalar  accountable for some extracardiac influence
  axis                     ;; coordinate system
  LV-PV-loop-color         ;; color of the pressure-volume diagram
 ]

to setup

  ca

  if (scenario = "Normal") ;; setting parameters for "Normal" scenario
  [
   set E_v 0.0059
   set E_ao 0.6913
   set V0_lv 0
   set Vd_lv 0
   set P0_lv 0.1203
   set V_AO 50
   set V_LV 130
   set V_V 1000
   set R_mt 0.0158
   set R_ao 0.018
   set R_sys 1.0889
   set E_es_lv 2.8798
   set Lambda_lv 0.033
   set Preload_Volume-Status "Normal"
   set Afterload_Vascular-Resistance-sys "Normal-VR"
   set Myocardial-Contractility "Normal-contractility"
   set Vascular-Elastance-sys "Normal"
   set Aortic-stenosis? false
   set Mitral-stenosis? false
   set Heart-Rate 70
   set LV-PV-loop-color 55
  ]

   if (scenario = "Test")
  [ set LV-PV-loop-color 15]

  set count-down 0                                       ;; initialising the timer and tve
  set tve 0

  system-dynamics-setup

                                                          ;; setting the lists to be used for turtles x-coordinates
  set list-p []
  set list-v []

  create-axis                                             ;; setting coordinates system

                                                          ;; seting parameters values for different "Test" scenarios
  if (scenario = "Test") and (Preload_Volume-Status = "Decreased-preload-25%")
  [set V_V 625
   set V_lv 50]

  if (scenario = "Test") and (Preload_Volume-Status = "Decreased-preload-50%")
  [set V_V 250
  set V_lv 35]

  if (scenario = "Test") and (Preload_Volume-Status = "Increased-preload")
  [set V_V 1375]

  if (scenario = "Test") and (Myocardial-Contractility = "Decreased-contractility")
  [set E_es_lv 1.4]

   if (scenario = "Test") and (Myocardial-Contractility = "Increased-contractility")
  [set E_es_lv 4.0]

   if (scenario = "Test") and (Afterload_Vascular-Resistance-sys = "Increased VR X 2.0")
  [set R_sys 2.2]

   if (scenario = "Test") and (Afterload_Vascular-Resistance-sys = "Increased VR X 1.5")
  [set R_sys 1.6]

   if (scenario = "Test") and (Afterload_Vascular-Resistance-sys = "Decreased VR x 1.5")
  [set R_sys 0.67]


   if (scenario = "Test") and (Vascular-Elastance-sys = "Increased-arterial El+50%")
  [set E_ao 1.05]

   if (scenario = "Test") and (Vascular-Elastance-sys = "Decreased-arterial El-50%")
  [set E_ao 0.35]

   if (scenario = "Test") and (Vascular-Elastance-sys = "Increased-venous El+50%")
  [set E_v 0.009]

   if (scenario = "Test") and (Vascular-Elastance-sys = "Decreased-venous El-25%")
  [set E_v 0.0045]

   if (scenario = "Test") and (Aortic-stenosis? = true)
  [set R_ao 0.036]


   if (scenario = "Test") and (Mitral-stenosis? = true)
  [set R_mt 0.032]

  set HR-f round (( 60 / Heart-rate) * 1000)                                    ;; setting HR-f

  set k (Heart-rate * 0.015)                                                    ;; setting the k-scalar

  reset-ticks
end 

to create-axis                                                                  ;; creating coordinates system
  ask patches with [ pxcor = 0 ] [ set pcolor white ]
  ask patches with [ pycor = 0 ] [ set pcolor white ]

   ask patch -4 -4
  [ set plabel "0"
    set plabel-color white ]
  ask patch 50 190
  [ set plabel "Pressure mmHg"
    set plabel-color white
    ]
  ask patch 190 7
  [ set plabel "Volume ml"
    set plabel-color white
   ]

 ask patch -4 100
  [ set plabel "100"
    set plabel-color white
   ]

 ask patch -4 20
  [ set plabel "20"
    set plabel-color white
   ]

  ask patch -4 40
  [ set plabel "40"
    set plabel-color white
   ]

  ask patch -4 60
  [ set plabel "60"
    set plabel-color white
   ]

  ask patch -4 80
  [ set plabel "80"
    set plabel-color white
   ]

  ask patch -4 120
  [ set plabel "120"
    set plabel-color white
   ]

  ask patch -4 140
  [ set plabel "140"
    set plabel-color white
   ]

  ask patch -4 160
  [ set plabel "160"
    set plabel-color white
   ]

  ask patch -4 180
  [ set plabel "180"
    set plabel-color white
   ]

   ask patch 50 -7
  [ set plabel "50"
    set plabel-color white ]

   ask patch 100 -7
  [ set plabel "100"
    set plabel-color white ]

   ask patch 150 -7
  [ set plabel "150"
    set plabel-color white ]
end 

to go

  set count-down count-down + 1                         ;; starting the timer which governs the cardiac driving function
  if count-down = HR-f
  [reset-count-down]

  activate                                              ;; activating the cardiac driving function

  system-dynamics-go
  system-dynamics-do-plot

  create-list-v                              ;; generating coordinates for turtles coordinates as lists
  create-list-p

  if ticks > 15000
  [ create-turtles 1 [                       ;; creating a turtle every iteration/tick
    set color LV-PV-loop-color               ;; and ploting it according to the coordinates
    set shape "circle"                       ;; as values in the respective lists
    set size 1.0
    set xcor (last list-v)
    set ycor (last list-p)
    ]
  ]

  if (Scenario = "Normal") and ticks > 20000  ;; a stop command once the model reaches 20000 ticks and scenario = "Normal"
  [export-view "Norma1.png"                   ;; exporting the 'normal' pressure-volume diagram to be imported for comparison
  stop]                                       ;; as needed

  tick
end 

to activate                                 ;; activation of the cardiac driving function and tve
  ifelse count-down <= 500
  [set tve e ^ (-80 * ( count-down * 0.001 - 0.27 ) ^ 2)]
  [set tve 0]
end 

to reset-count-down                           ;; reseting the timer for a new cardiac cycle
  set count-down 0
end 

to-report result-v                            ;; generating lists with turtles coordinates
  report V_lv
end 

to-report result-p
  report P_lv
end 

to  Compare-N-PV-loops                         ;; importing the 'normal' PV-diagram
  import-drawing "Norma1.png"
end 

                                               ;; building up lists with turtles coordinates

to create-list-v
  if ticks > 15000
  [set list-v lput result-v list-v]
end 

to create-list-p
  if ticks > 15000
  [set list-p lput result-p list-p]
end 

to reset-test                                  ;; reseting initial condition in the "Test" mode = same parameters as in "Normal" Scenario
   set E_v 0.0059
   set E_ao 0.6913
   set V0_lv 0
   set Vd_lv 0
   set P0_lv 0.1203
   set V_AO 50
   set V_LV 130
   set V_V 1000
   set R_mt 0.0158
   set R_ao 0.018
   set R_sys 1.0889
   set E_es_lv 2.8798
   set Lambda_lv 0.033
   set Preload_Volume-Status "Normal"
   set Afterload_Vascular-Resistance-sys "Normal-VR"
   set Myocardial-Contractility "Normal-contractility"
   set Vascular-Elastance-sys "Normal"
   set Heart-Rate 70
   set Aortic-stenosis? false
   set Mitral-stenosis? false
end 

to export-image                                 ;; exporting the world view to be used for comparison
  export-view user-new-file
end 

There is only one version of this model, created about 1 year ago by Victor Iapascurta.

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Cardiac_output-Simple_Model_01_01.png preview Preview for 'Cardiac_output-Simple_Model_01_01' about 1 year ago, by Victor Iapascurta Download

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