3. PITUITARY GLAND
The pituitary is located
at the base of the brain,
in a small depression of
the sphenoid bone
(sella turcica).
• Purpose: control the
activity of many other
endocrine glands.
“ Master gland”
• Has two lobes,
the anterior & posterior lobes.
4.
5. HYPOPITUITARISM
• Hypopituitarism- denotes
1. Underproduction of GH alone
2. In combination with deficiencies of other
pituitary hormones.
• Incidence – 1 in 4000- 1 in 10000 live births
( as per Nelson).
6. Contd…
• Hypopituitarism occurs when the anterior
(front) and posterior lobes of the pituitary
gland loses its ability to make hormones,
resulting in multiple pituitary hormone
deficiencies. Physical symptoms depend on
which hormones are no longer being
produced by the gland.
7. GH Dwarfism, Lethargy,
Premature aging
ACTH Addison’s disease
TSH Decrease in BMR,HR,CO,BP.
Cretinism
PROLACTIN Too little milk
FSH Late puberty, Infertility
LH Amenorrhea, Impotence
OXYTOCIN Prolonged labour, Diminished
milk
ADH(VASSOPRESSIN) Diabetes insipidus, Dilute
urine and Increased urine
output.
12. ACQUIRED CAUSES
• Any lesion that damages hypothalamus,
pituitary stalk or anterior pituitary hormone
deficiency .
• Most common lesion- craniopharyngioma
• Diabetes insipidus- most frequently seen.
14. Clinical features
Congenital :
Growth and development:
• Birthweight: near-normal
• Birth length: may be slightly decreased
• Postnatal growth: severe growth failure
• Bone age: delayed, but may be advanced relative
to height age
• Genitalia: micropenis in childhood; normal for
body size in adults
• Puberty: delayed 3-7 yr
• Sexual function and fertility: normal
• Craniofacies
15. • Hair: sparse before the age of 7 yr
• Forehead: prominent; frontal bossing
• Skull: normal head circumference; craniofacial
disproportion due to small facies
• Facies: small
• Nasal bridge: hypoplastic
• Orbits: shallow
• Dentition: delayed eruption
• Sclerae: blue
• Voice: high pitched
16. • Musculoskeletal/metabolic/miscellaneous
• Hypoglycemia: in infants and children; fasting
symptoms in some
• adults
• Walking and motor milestones: delayed
• Hips: dysplasia; avascular necrosis of femoral
head
• Elbow: limited extensibility
• Skin: thin, prematurely aged
• Osteopenia
20. ACQUIRED
• TUMORS- headache, vomiting, visual
disturbance, pathologic sleep patterns,
decreased school performance, seizures,
polyuria and growth failure.
• Craniopharyngioma- visual field defects, optic
atrophy, papilledema and cranial nerve palsy.
• Loss of weight, asthenia, sensitivity to cold,
mental torpor and absence of sweating.
21. Contd..
• Sexual maturation fails or regression
• Atropy of gonads with amenorrhea and loss of
pubic hair.
• Growth slows dramatically.
22. INVESTIGATION
• CRITERIA FOR GROWTH FAILURE:
1. Height < 1 percentile for age and sex
2. Height > 2 SD below sex adjusted mid parent
height.
23. Evaluation
Growth related history and patient
physical exam
Growth failure
Short stature
Imaging CT and MRI
Laboratory Measurement of GH, IGF-1 and IGF-1
binding protein levels.
Determination of peak GH levels after
stimulation test
Special testing Family history and genetic analyses
Other functions Levels TSH, free thyroxin, ACTH, Cortisol,
Gonadotropines, Gonadal steriods.
25. Contd..
TEST PROTOCOL LEVELS SPECIFICITY
Exercise 10 mins 0,10,20, mins 50%
Insulin 0.05-0.1 U/kg 0,30,60,90 mins 85%
Clonidine 0.15mg/m2 0,30,60,90 mins 80%
GHRH 1mcg/kg -30,0,30,45 mins 95%
PREREQUISITES FOR GH STIMULATION:
1. Normal thyroid profile
2. Priming in childern with bone age <10 yrs and delayed puberty
BOYS- Testosterone enanthate 100mcg IM 5 days prior to test
GIRLS- Ethinyl estradiol 100mcg/day -3 days.
INTERPRETATION:
<5 ng/ml-Growth hormone deficiency
5-10ng/ml- Indeterminate
>10ng.ml- Growth hormone deficiency excluded.
29. FOLLOW UP
• CLINICAL- Height velocity and Z score for
height.
• Blood sugar, TSH, bone age- yearly
• After puberty- bone age 6 monthly
• DISCONTINUATION OF TREATMENT:
Target height is achieved
Bone age- boys-16years, girls- 14 years.
30. Diabetes Insipitus
• DI is usually insidious but can occur with
damage to the hypothalamus or the pituitary.
(neurogenic DI)
• May be a result of defect in renal tubules, do
not respond to ADH (nephrogenic DI)
• Decreased production or release of ADH
results in massive water loss
• Leads to hypovolemic & dehydration
31. CLINICAL FEATURES
Polyuria
Urine specific gravity low
Polydipsia (excessive drinking)
Weight loss
Dry skin & mucous membranes
Possible hypervolemia, hypotension,
electrolyte imbalance
32. DIAGNOSTIC TESTS
• Serum sodium
• Urine specific gravity
• Serum osmolality
• Urine osmolality
• Serum ADH levels
• Vasopressin test and water deprivation test:
increased hyperosmolality is diagnostic for DI.
33. TREATMENT
Medical management includes
• Rehydration IV fluids (hypotonic)
• Symptom management
• ADH replacement (vasopressin)
• For nephrogenic DI: thiazide diuretics,
mild salt depletion, prostaglandin
inhibitors (i.e. ibuprophen)
