Pituatry clinical Flashcards
A hormone is?
secreted
bioactive messenger
A hormone can
travel in blood
effect target cell
stimulate/inhibit
maintain physiological state
how big is the thyroid gland
10-15g
thyroxine is?
iodide + tyrosine
thyroxine stored where
gland
thyroxine secreted to
blood
order, releasing factor…
Releasing factor
tropic hormone
target hormone
response
name releasing factor.. Thyroid axis
Hypothalamus:
Thyrotropin releasing hormone
(TRH)
Pituitary:
Thyroid stimulating hormone
(TSH)
Thyroid:
Thyroxine and triiodothyronine
(T4 and T3)
End Organ(s): Basal metabolic rate, pulse
Hypothyroidism deficiency 1st
Thyroid (T3/T4)
Hypothyroidism deficiency 2nd
pituitary (TSH)
Hypothyroidism deficiency 3rd
Hypothalamus (TRH)
Hypothyroidism Resistance
Periphery (P, BMR)
Pituitary sits in
pituitary fossa
pituitary fossa is in
in sphenoid bone
Cavernous sinus contains
Internal carotid Artery
Posterior Pituitary makes
ADH + Oxytocin
Anterior pituitary makes
6 tropic hormones
Lesion of the optic chiasm causes
Bitemporal hemianopia (visual field )
bitemporal hemianopia caused by
optic chiasm is compressed
Symptoms of endocrine diseases
Shave less freq
Libido decrease
Reduce energy
Gained weight
Anterior pituitary is
Vascular network connected to hypothalamus
Anterior pituitary hormones
TSH ACTH FSH+LH GH PROLACTIN
TSH—>
thyroid—> thyroxine
influnces metabolic rate
ACTH—->
adrenals–> cortisol
influences stress response
FSH + LH—>
gonads—> testo/estadriol
sperm, ova
GH—>
liver—> IGF-1
vertical growth, bonemass, metabolism
PRL —>
Breast –> lactation
The bigger the tumour the more it..
compresses the stalk
Test of hypofunction
Measure the pituitary and target hormone
Endocrine evaluation
Clinical symptoms confirm abnormality of target hormone determine part of axis that's abnormal by measuring each level localise site of abnormality identify pathology
What % of macro Adenomas are non secreting
50
Ways in which pituitary tumours present
Mass effect Hypoventilation Incidental Hyper function Apoplexy/ haemorrhage
Treatment-
Surveillance
Surgery
Medical
Radiotherapy
Principles of hormone replacement :
Goal of treating hypopituitarism is to
Replace hormones
Replacement needs to
Recognise digital variations and natural evolution of hormones over time