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Samenvatting Hypofyse-as testen

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Samenvatting van 2 pagina's voor het vak RA-3 aan de UvA (Hypofyse-as testen)

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  • January 8, 2021
  • 2
  • 2020/2021
  • Summary
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Hypofyse adenomen
❖ hypofyse-bijnieras
➢ overproductie: ​ziekte van Cushing​ → centrale adipositas, glucose
tolerantie/diabetes, huidatrofie, virilisatie, osteoporose, psychische
stoornissen, moonface
■ diagnose:
● is er sprake van hypercortisolisme?​ 24-uurs excretie cortisol
urine, 1 mg ​dexamethason ​suppressietest overnacht,
middernacht (speeksel) cortisol.
● is het ACTH afhankelijk?​ ACTH serum
● hypofyse of ectopisch?​ lange i.v. 7 mg dexamethason
suppression of inferior sinus petrosus sampling
■ behandeling:
● transsfenoïdale resectie
● bilaterale adrenalectomie
● medicamenteus: metyrapon, ketoconazol, etomidaat
➢ onderproductie: ​ziekte van Addison ​→ moeheid, algemene zwakte,
hyperpigmentatie, vermagering, ​hyponatriëmie​, hyperkaliemie,
hypercalciemie, obstipatie, diarree, duizeligheid, eosinofilie, vitiligo
■ diagnose:
● insuline tolerantietest ​(gouden standaard)
● metyrapon test: remming cortisol zou via verhoging ACTH
moeten leiden tot toegenomen cortisolproductie
● CRH stimulatie test → verhoging ACTH → verhoging cortisol
● (ACTH stimulatie test = vals negatief wann. kort bestaand)
■ behandeling
● hydrocortison ​(3x/dd, korte T1/2): bij ziekte/stress verdubbelen!
● (prednison en dexamethason hebben lange T1/2 waardoor
makkelijker klachten cushing)
❖ prolactine​ ​#1 hormonaal actieve tumor​!
➢ overproductie: galactorroe (vaak eenzijdig), libidoverlies, erectiele dysfunctie,
sec. amenorroe
■ diagnose: serum prolactine/MRI
■ behandeling:
● dopamine agonist​ (zeer effectief)
● behandeling hypogonadisme
● transsfenoïdale resectie
➢ onderproductie geeft geen klachten, behalve bij een vrouw in de
borstvoedingsperiode
❖ Groeihormoon ​- IGF 1
➢ overproductie: ​acromegalie ​of gigantisme (wanneer epifysairschijven nog niet
gesloten)
■ diagnose:
● insuline tolerantie test​ → stress → stijging GH
● GHRH argininetest moet ook leiden tot stijging GH
● verhoogd IGF 1 serum
■ behandeling:
● transsfenoïdale resectie

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