Pituitary gland
Download
1 / 56

PITUITARY GLAND - PowerPoint PPT Presentation


  • 122 Views
  • Updated On :

PITUITARY GLAND. Where is it located??? Name its’ 3 parts or sections. What hormones are secreted by the pituitary gland???. Pituitary Gland. Anterior Pituitary (adenohypophysis). SECRETES 6+ HORMONES: ACTH (adrenocorticotropic hormone) aka (corticotrphin)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'PITUITARY GLAND' - juliet


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Pituitary gland
PITUITARY GLAND

  • Where is it located???

  • Name its’ 3 parts or sections.

  • What hormones are secreted by the pituitary gland???



Anterior pituitary adenohypophysis
Anterior Pituitary(adenohypophysis)

  • SECRETES 6+ HORMONES:

    • ACTH (adrenocorticotropic hormone)

      • aka (corticotrphin)

        release of cortisol in adrenal glands

    • TSH (thyroid stimulating hormone)

      • aka (thyrotropin)

        release of T3 & T4 in thyroid gland

    • GH (growth hormone)

      • aka (somatotropin)

        stimulates growth of bone/tissue


Pituitary gland

ANTERIOR PITUITARY(adenohypophysis)

  • FSH (follicle stimulating hormone)

    stimulates growth of ovarian follicles & spermatogenesis in males

  • LH (lutenizing hormone)

    regulates growth of gonads & reproductive activities

  • Prolactin

    • aka (luteotropin/mammotropin)

      promotes mammary gland growth and milk secretion


Positive vs negative feedback mechanisms
Positive vs Negative Feedback Mechanisms

  • Give some examples of

    • Negative

    • Positive


Anterior hyperpituitary disorders
Anterior HYPERpituitary Disorders

  • ETIOLOGY

    • Primary: the defect is in the gland itself which releases that particular hormone that is too much or too little.

      • Example: Cushings

    • Secondary: defect is somewhere outside of gland

      i.e. GHRH from hypothalamus

      TRH from hypothalamus


Pituitary tumors
Pituitary Tumors

  • 10% OF ALL BRAIN TUMORS

  • What are the diagnostic tests to diagnose a pituitary tumor?

  • tumors usually cause hyper release of hormones

    (Recall all hormones)


Anterior hyperpituitary disorders1
Anterior HYPERpituitary Disorders

  • What would happen if you had TOO MUCH secretion of prolactin?

  • Too much release of Lutenizing Hormone (LH)?


Anterior pituitary hyperfunctioning
Anterior PituitaryHYPERfunctioning

  • What would happen if you had too much growth hormone secretion???

  • Which goolish character on the Addam’s Family may have had too much GH secretion?


Too much growth hormone
Too Much Growth Hormone

  • GIGANTISM IN CHILDREN

    • skeletal growth; may grow

      up to 8 ft. tall and > 300 lbs

  • ACROMEGALY IN ADULTS

    • enlarged feet/hands, thickening of bones, prognathism, HTN, wt. gain, H/A, visual disturbances, diabetes mellitus, enlargement of the heart and liver


Pituitary gland




Medical interventions for pituitary tumors
Medical Interventions for Pituitary Tumors

  • Medications

    • *Parlodel (bromocriptine) to

      ________ & GH levels.

  • Radiation therapy

    • external radiation will bring down GH levels 80% of time


Pituitary gland

  • *Neurosurgery:

    • procedure called “transsphenoidal hypophysectomy”; New Method

    • Most common method: incision is made thru floor of nose into the sella turcica.



Nursing management nursing diagnosis
Nursing Management &Nursing Diagnosis

  • Pre op hypophysectomy

    • Anxiety r/t

      • body changes

      • fear of unknown

      • brain involvement

      • chronic condition with life long care


Nursing management nursing diagnosis1
Nursing Management &Nursing Diagnosis

  • Sensory-perceptual alteration r/t visual field cuts

    • diplopia

    • secondary to pressure on optic nerve.

  • Alteration in comfort (headache) r/t

    tumor growth/edema


Nursing management nursing diagnosis2
Nursing Management &Nursing Diagnosis

  • Knowledge deficit r/t post-op teaching

    • pain control

    • ambulation

    • hormone replacement

    • activity


Incisional disruption after transsphenoidal hypophysectomy
Incisional disruption after transsphenoidal hypophysectomy

Avoid bending and straining X 2 months post transsphenoidal hypophysectomy,

Use stool softeners

Avoid coughing

Saline mouth rinses

No toothbrushes for 7-10 days


Post op csf leak where sella turcica was entered
Post-op CSF Leak where sella turcica was entered

any clear rhinorrhea - test for glucose

+ glucose = CSF Leak

Notify physician

HOB 30 degrees

Bedrest


Post op problems cont
Post op problems cont.

Periocular edema/ecchymosis

Headaches

Visual field cuts/diplopia

Meningitis


Post operative care
Post operative care

Post-op complications of hormone deficiency:

What would happen if you didn’t have enough ADH?

What is that disorder called?


Other deficiency
Other deficiency:

  • Decrease ACTH will require cortisone replacement due to decrease glucocorticoid production.

  • Can you live without glucocorticoids????


Other deficiency1
Other deficiency:

  • in sex hormones can lead to infertility due to decreased production of ova & sperm

  • What were those hormones called again?


Anterior pituitary hypofunction
Anterior PituitaryHYPOfunction

  • Etiology (rare disorder) may be due to disease, tumor, or destruction/removal of the gland.

  • Diagnostic tests

    • CT Scan

    • Serum hormone levels


S s anterior pituitary hypofunctioning
S & S Anterior Pituitary HYPOfunctioning

  • GH

  • FSH/LH

  • Prolactin

  • ACTH

  • TSH


Medical management
Medical Management

  • neurosurgery -- removal of tumor

  • radiation - tumor size

  • hormone replacement

    • cortisol, thyroid, sex hormones


Nursing management
Nursing Management

  • Assessment of S & S of hypo or hyper

    functioning hormone levels

  • Teaching-Compliance with hormone replacement therapy

  • Counseling and referrals

  • Support medical interventions


Posterior pituitary neurohypophysis

Posterior Pituitary(Neurohypophysis)

What hormones are released by the posterior pituitary?

_____ & _____are released when signaled by hypothalamus


Adh vasopressin avp
ADH (Vasopressin/AVP)

  • secreted by cells in the hypothalmus and stored in posterior pituitary

  • acts on distal & collecting tubules of the kidneys making more permeable to H20 -- or volume excreted?


Bonus round
Bonus Round...

  • Under what conditions is ADH released?

  • ADH has vasoconstrictive or vasodilation action???



Oxytocin
Oxytocin

  • Controls lactation & stimulates uterine contractions

  • ‘Cuddle hormone’Research links oxytocin and socio-sexual behaviors


Posterior hyperpituitary disorders
Posterior HYPERpituitary Disorders

  • SIADH (TOO MUCH ADH!!)

  • small cell lung cancer, Ca duodenum/pancreas, trauma, pulmonary disease, CNS disorders

  • drugs -- Vincristine, nicotine, general anesthetics, tricyclic antidepressants


Think tank
Think tank:

  • If you have increased ADH secretion...

    What would the clinical signs/symptoms be?


Clinical manifestations siadh
Clinical manifestations-SIADH

  • Weight gain or weight loss?

  • or urine output?

  • or serum Na levels?

    • thirst

    • weakness

    • muscle cramps

    • H/A

    • Diarrhea


If hyponatremia worsens development of neurological manifestations
If hyponatremia worsens development of neurological manifestations

  • lethargy

  • decrease tendon reflexes

  • abdominal cramping, vomitting

  • coma

  • seizures


Diagnostic tests siadh
Diagnostic Tests-SIADH

  • Serum Na+ <134meq/l

  • Serum osmolality <280 OSM/kg H2O

  • urine specific gravity >1.005

  • or normal BUN


Medical treatment
Medical Treatment

  • ***FLUID RESTRICTION

    • Stop drugs causing issue

    • LIMIT TO 1000ML/24HRS

      • may be as little as 500-600ml/24hrs

    • IF CHF -- Lasix (temporary fix)

      • What do watch for?

    • Treat underlying problem

      • Chemo, radiation

    • demeclocycline (Declomycin) & Lithium

      • 600 po-1200mg/day to inhibit ADH


Nursing interventions siadh
Nursing Interventions-SIADH

  • Fluid restriction

  • Daily weights

  • 1 lb. weight = 500ml fluid retention

  • Accurate I & Os


Nursing management siadh
Nursing Management-SIADH

  • F & E imbalances

    • fluid intake

  • High risk for injury r/t complications of fluid overload (seizures)


Posterior hypopituitary adh disorders

Posterior HYPOpituitaryADH Disorders

Diabetes Insipidus

(too little ADH)


Etiology of di
Etiology of DI

  • 50% idiopathic

    • Central (aka. neurogenic)

      • usually occurs suddenly

      • head trauma, brain tumors, infection

    • Nephrogenic

      • inability of tubules to respond to ADH

      • drug therapy, renal damage, heredity

    • Psychogenic

      • what is this?


Clinical manifestations di
Clinical Manifestations-DI

  • Polydipsia

  • Polyuria (10L in 24 hours)

  • Severe fluid volume deficit

    • wt loss

    • tachycardia

    • constipation

    • Shock


Diagnostic tests di
Diagnostic Tests-DI

  • or urine specific gravity

    orserum Na

    orserum osmolality


Diagnostic tests di1
Diagnostic Tests - DI

Water deprivation test

Urine output

>4000ml/24hr ----- fluid restrict at start of test

<4000ml/24hr ---- fluid restrict at midnight

Baseline weight, HR & BP

Labs?

Hold fluids for 6hrs (usually 6am-12noon)

Hourly urine monitoring for urine SG, osmolality & volume

Draw sample for plasma osmolality when urine osmolality increases <30mOsm/kg

When plasma osmolaity is >288mOsm/kg, pt is deydrated --- admin vasopressin

5 units of Vasopressin (ADH) Subq

Obtain urine osmolality 30-60minutes after injection

Discontinue test if pt weight drops >2kg at any time


Di diagnostic tests reading the results water deprivation
DI- Diagnostic TestsReading the Results – Water deprivation

  • After ADH administered:

    • Normal or psychogenic

      • Urine osmolality normal

    • Central

      • Urine osmolality increases

    • Nephrogenic

      • Minimal to no response

  • What is this patient at risk for?

  • Is this test done at home or an acute care facility.


Medical management di
Medical Management-DI

  • Identification of etiology, H & P

  • Tx of underlying problem

  • Central

    • IV fluids?

    • DDAVP (oral, IV, nasal spray)

    • Pitressin s.c. IM, nasal spray

    • Chlorpropamide

  • Nephrogenic


Neprhogenic di treatment
Neprhogenic DI Treatment

  • Dietary restriction of Na

    • < 3grams/day

  • Thiazide diurectics (HCTZ, diuril)

    • Allows kidney to absorb more H20 in loop of Henle & distal tubule

    • Increases the amount of Na excreted in the urine

  • Indocin (NSAID)

    • Increases renal response to ADH


Pituitary gland

Mechanism of action of the paradoxical effect of thiazide diuretics on NDI.

Magaldi A J Nephrol. Dial. Transplant. 2000;15:1903-1905

© European Renal Association-European Dialysis and Transplant Association


Nursing management di
Nursing Management-DI diuretics on NDI.

  • Assess for F & E imbalances

  • High risk for sleep disturbances

  • Increase po/IV fluids

  • RF Injury (hypovolemic shock)

  • Knowledge deficit

  • High risk for ineffective coping