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Samenvatting Algemene Farmacologie En Farmacokinetiek (K02B9A)

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samenvatting van de hele cursus/slides

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Uploaded on
May 28, 2022
Number of pages
7
Written in
2020/2021
Type
Summary

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Oraal
Fluctuatie: piekconcentratie direct na toediening, dalconcentratie net voor toediening
Ophoping: nog GM aanwezig wanneer we een volgende dosis toedienen

IV infuus
- Geen fluctuatie maar wel ophoping, gaat naar een evenwichtsconcentratie
- Constante v = k0 dus 0e orde
- Eliminatie hoort er niet bij
- 5 halflevens om SS te bereiken, korter halfleven geeft een snellere SS




Combinatie ladingsdosis met IV infuus

DL = CpSS . Vd

Cpnet = CpDL + Cpinfuus
Cpnet = CpSS . e-kt + CpSS . (1 - e-kt)
Cpnet = CpSS




Beeïndingen van infuus

Na bereiken CpSS
Cp = CpSS . e-kt’ t’ = tijd verlopen na beëindigen van infuus

Voor bereiken CpSS
k0
Concentratie op moment van beëindigen CT = (1 – e-kT) T = tijdstip van
Cl
beëindigen

, k0
Daarna mono-exponentieel dalen Cp = (1 – e-kT) . e-kt’
Cl




Altijd CpSS tussen het therapeutisch venster kiezen.
Als het er niet tussen zit: Cl veranderen uit Cp SS en k0. Dan nieuwe k0 bereken met Cl en Cpss tussen
de range.




Herhaalde IV toediening
Cp fluctueren tussen Cmin en Cmax
Piek: t = 0
Dal: t = τ = t1/2

n = nummer van laatste dosis
τ = dosisinterval (h)
t = tijd sinds laatste dosis tussen 0 en τ
totale therapietijd = ((n-1) x τ) + t

Uitzondering van 1e dosis (ladingsdosis): dosis en dosisinterval constant
PK blijft constant gedurende de therapie
Dosisinterval neemt af van Cpmax en Cpmin

D
Bij SS tijdens dosisinterval: CpSS = Cpmax,SS . e-kt CpSS,max = −kτ
Vd .(1−e )
Bij t = τ Cpmin,SS = Cpmax,SS . e-kτ

ss
ln ⁡(Cmax , , ss)
τ= Cmin = t1/2 = ln(2)/k
k
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