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Samenvatting farmacotherapie bij ouderen

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Samenvatting van hoofdstuk 8 farmacotherapie bij ouderen uit het boek, Leerboek Geriatrie, probleemgeoriënteerd werken met ouderen.

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Samenvatting farmacotherapie bij ouderen
Inhoud
Welke aspecten van het ouder worden zijn belangrijk voor de farmacotherapie bij ouderen?.............3
Innameproblemen..................................................................................................................................3
farmacokinetische veranderingen..........................................................................................................3
absorptie............................................................................................................................................3
Verdeling............................................................................................................................................3
Eiwitbinding........................................................................................................................................4
eliminatie door lever..........................................................................................................................4
eliminatie door nieren........................................................................................................................4
Geneesmiddelen waarvan de dosering moet worden aangepast aan de nierfunctie.............................5
Start low, go slow...............................................................................................................................5
farmacodynamische veranderingen.......................................................................................................5
Evenwicht en valrisico........................................................................................................................6
Bloeddruk...........................................................................................................................................6
Temperatuur......................................................................................................................................6
Delier en andere anticholinerge effecten...........................................................................................6
Geneesmiddelen met sterk anticholinerge effecten.......................................................................7
Immuunsysteem.................................................................................................................................7
geneesmiddelgebonden bijwerkingen....................................................................................................7
Rationeel voorschrijven bij ouderen.......................................................................................................8
Polyfarmacie en geneesmiddelgerelateerde problemen........................................................................8
Ongeschikt geneesmiddel...................................................................................................................8
Onderbehandeling..............................................................................................................................8
Criteria om al dan niet te behandelen................................................................................................8
Deprescribing.....................................................................................................................................8
Risicogeneesmiddelen........................................................................................................................9
Nierfunctie........................................................................................................................................10
Therapietrouw..................................................................................................................................10
Medicatiebeoordeling......................................................................................................................10
STRIP.............................................................................................................................................10
Screeningsinstrumenten...................................................................................................................11
Medicatieoverdracht (Richtlijn overdracht van medicatiegegevens in de keten).............................11
Klinisch relevant voorschrijven.........................................................................................................12
Stopzetten van farmacotherapie in het kader van palliatieve zorg......................................................12

, Hart en vaten....................................................................................................................................12
1. Nitraten....................................................................................................................................12
2. Diuretica...................................................................................................................................12
3. Antihypertensiva.......................................................................................................................12
4. Digoxin......................................................................................................................................13
5. Cholesterolverlagende middelen..............................................................................................13
6. Acetylsalicylzuur.......................................................................................................................13
Zenuwstelsel.....................................................................................................................................13
7. Antipsychotica..........................................................................................................................13
8. Benzodiazepinen.......................................................................................................................13
9. Antidepressiva..........................................................................................................................13
10. Cholinesteraseremmers..........................................................................................................14
Maag-darmkanaal en endocrien stelsel............................................................................................14
11. Laxativa...................................................................................................................................14
12. Protonpompremmers.............................................................................................................14
13. Glucoseverlagende middelen en insuline...............................................................................14
Skelet................................................................................................................................................14
14. Bisfosfonaten..........................................................................................................................14
Opstarten van comforttherapie in het kader van palliatieve zorg........................................................14
Zenuwstelsel.........................................................................................................................................14
Delier................................................................................................................................................14
Angst.................................................................................................................................................14
Pijn....................................................................................................................................................15
Insomnia...........................................................................................................................................15
Maag-darmkanaal.................................................................................................................................15
Nausea en braken.............................................................................................................................15
Obstipatie.........................................................................................................................................15
Luchtwegen..........................................................................................................................................16
Dyspnoe............................................................................................................................................16
Excessief respiratoir secreet (doodsreutel)......................................................................................16
Medicatie in de laatste levensfase.......................................................................................................16

, Welke aspecten van het ouder worden zijn
belangrijk voor de farmacotherapie bij ouderen?
- Farmacokinetiek en farmacodynamiek verandert door verouderingsproces
- Individueel grote verschillen.



Innameproblemen
- Verminderde motiliteit slokdarm en maag  grote dragees kunnen blijven steken 
ontstaan perforatie, ulceratie of piloesofagitis.
o Vooral bij;
 Tetracyclines, kinidinesulfaat, kaliumdragees, acetylsalicylzuur en orale
bisfosfonaten.
o Daardoor hebben vloeibare toedieningsvormen voorkeur.
- Strips als verpakking zijn soms lastig  moeilijk eruit te krijgen, of mee innemen aluminium
- Bij cognitieve problemen en medicatie te lang in de mond houden  ulcus in de mondholte.




farmacokinetische veranderingen
absorptie
o vaker achloorhydrie; in de maag geen zoutzuur waardoor verhoogde pH in de maag.
 ook protonpompremmers verhogen ph in de maag
 geneesmiddelen die pH-afhankelijke absorptie hebben kunnen daardoor
een ander absorptieprofiel krijgen
 sommige medicatie wordt beter opgenomen in een zure maag
 sommige antischimmelmiddelen, zoals itraconazol en ketoconazol.
 Deze medicatie innemen met zure vloeistof (bijv Cola) lukt dat niet
 inname met vetrijke maaltijd aanbevolen.
 Bij inname in drankvorm zijn bovenstaande voorzorgen niet nodig.
Verdeling
o Percentage vetweefsel in verhouding tot totale hoeveelheid lichaamswater neemt
toe en Lean body mass neemt af  verdeling van vet- en wateroplosbare
geneesmiddelen wordt anders.
 Lipofiele middelen  groter (fictief) verdelingsvolume dan bij jongere
volwassenen ivm toename vetcompartiment.
 Diazepam bijv cumuleert in vetweefsel en de halveringstijd neemt
sterk toe  werking houdt langer aan.
 Hydrofiele middelen  oplaaddosis zal lager worden gekozen door afname
watercompartiment
 Extra alertheid bij geneesmiddelen die geringe therapeutische
breedte hebben
o Lithium, digoxine en gentamicine.
o Start low, go slow!!
 monitoren bloedspiegels geeft inzicht in cumulatie en evt. noodzaak tot
dosisaanpassing.

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Hoofdstuk 8
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Written in
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