Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical Model 1 Challenge...

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Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical Model 1 Challenge the future Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical Model W.M. Boon Dr. ir. J. F. Vermolen Prof. dr. ir. C. Vuik Dr. ir. J. H. Dubbeldam D. Koppenol, MSc

Transcript of Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical Model 1 Challenge...

Page 1: Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical Model 1 Challenge the future Incorporation of Contracture Formation.

Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical Model

1Challenge the future

Incorporation of Contracture Formation during Dermal Wound Healing: a Mathematical ModelW.M. Boon

Dr. ir. J. F. Vermolen Prof. dr. ir. C. Vuik Dr. ir. J. H. Dubbeldam D. Koppenol, MSc

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Opzet

• Onderzoeksdoel• Biologisch proces• Wiskundig model

• Componenten• Contractie

• Resultaten• Conclusies & aanbevelingen

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Onderzoeksdoel

• Wondgenezing• Vorming van nieuw weefsel

• Sterkte afhankelijk van de mate van isotropie• Samentrekking van het weefsel (contractie)

• Contractuur vorming• Modelleren van het volledige proces

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Gebied

• Doorsnede huid• Wondgebied• 3 weken

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Biologisch proces

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Biologisch Proces

• Fibrine klont gevormd• Afbraak door tPA

• PDGF verspreidt via diffusie• Leukocyten arriveren• TGF-β wordt uitgescheden

• Chemoattractant• Fibroblasten arriveren

• Myofibroblasten• Celdeling

• Collageen productie• Contractie

Contractie

Fibroblasten en Myofibroblasten

PDGF

Leukocyten

tPA

Fibrine

TGF-β

Collageen

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Wiskundig model

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Componenten: Cellen

• Discrete schijven• Receptoren

• Leukocyten• Bloedsomloop

• Fibroblasten en myofibroblasten• Omliggend gebied• Celdeling

• Beweging• Celdood

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Componenten: Cytokines

• Diffusievergelijkingen

• tPA: Afbraak fibrine• PDGF: Aantrekking leukocyten• TGF-β: Aantrekking (myo)fibroblasten

• Grid

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Componenten: Vezels

• Fibrine

• Collageen• Dichtheid en oriëntatie• Tensor

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Contractie

• Samentrekking van het weefsel• Tijdelijke krachten

• Fibroblasten en myofibroblasten• Permanente krachten

• Myofibroblasten• Vorming van contractuur

• Invloed op alle componenten• Discreet• Continu

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Tijdelijke krachten

• Puntkracht• Kromme rond cel

• Opsplitsen in lijnstukken• Meerdere puntkrachten

• Formulering

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Permanente krachten

• Contractuur vorming• Elementsgewijs• Timer per element

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Resultaten

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Celpopulaties

0 100 200 300 400 5000

50

100

150

Tijd (uren)

Aan

tal c

elle

n

Leukocyten

Fibroblasten

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Resultaten cellen

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Resultaten cytokines

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0.1

0.2

0.3

0.4

Tijd (uren)

Gem

idde

lde

conc

entr

atie

PDGF

TGF-

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Resultaten cytokines

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Resultaten vezels

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0.2

0.4

0.6

0.8

1

Tijd (uren)

Gem

idde

lde

dich

thei

d

Collageen

Fibrine

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Resultaten vezels

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Resultaten: Vezels

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0.1

0.2

0.3

0.4

Time (hours)

Col

lage

en a

niso

trop

ie

95e percentielGemiddelde

5e percentiel

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Contractie

0 100 200 300 400 5000.85

0.9

0.95

1

1.05

Tijd (uren)

Rel

atie

ve o

pper

vlak

te

95e percentiel

Gemiddelde

5e percentiel

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Toename in tijdelijke krachten

0 100 200 300 400 5000.85

0.9

0.95

1

1.05

Tijd (uren)

Rel

atie

ve o

pper

vlak

te

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Conclusies en aanbevelingen

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Conclusies

• Hybride model: Discrete cellen en continue concentraties

• Verschillende stappen van wondgenezing• Toevoeging van contractie

• Bewegend grid• Invloed op alle componenten

• Vorming contractuur

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Aanbevelingen

• Groter oppervlak• Tensor representatie verder benutten• Differentiatie tot myofibroblast

• Model als basis

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Vragen