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Week 2 Endocrine Anatomy and Physiology review & Pituitary Disturbances

Week 2 Endocrine Anatomy and Physiology review & Pituitary Disturbances. Ann MacLeod, MPH, BScN, RN. Agenda. General Anatomical Overview Endocrine vs Exocrine Classes of Hormones proteins steroids Positive and negative feedback mechanisms Pituitary disturbances. Endocrine system.

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Week 2 Endocrine Anatomy and Physiology review & Pituitary Disturbances

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  1. Week 2 Endocrine Anatomy and Physiology review & Pituitary Disturbances Ann MacLeod, MPH, BScN, RN

  2. Agenda • General Anatomical Overview • Endocrine vs Exocrine • Classes of Hormones • proteins • steroids • Positive and negative feedback mechanisms • Pituitary disturbances

  3. Endocrine system • Functions as chemical communication & control • slower than the nervous system • may target one type of cells or many • Glands secrete hormones into the blood stream, not into a duct like the exocrine glands

  4. Hormone secreting glands of the endocrine system

  5. Classification of Hormones

  6. Protein Hormones

  7. Steroid Hormones

  8. Feedback mechanisms • Negative • elevated blood levels of substance ( sugar ) • gland releases hormone (insulin) • hormone works to decrease the levels of the substance ( sugar transferred intracellularly with help of insulin) • blood levels are decreased (sugar )  pancreas ceases to produce insulin

  9. Feedback mechanisms • Positive • elevated blood levels of substance (oxytocin) • gland (pituitary) releases hormone (oxytocin ) • hormone works to further increase the levels of the substance (oxytocin stimulates the pituitary to increase more oxytocin release during labour)

  10. Disturbances Hypersecretion • Tumors, genetic disorders Hyposecretion • Target cells damaged • Receptors on target cells malfunctioning • damaged gland due to age, injury, genetics see table in handout or pg 1030 in Brunner

  11. Hypothalmus affects Pituitary Anterior Pituitary: Hypothalmus secretes releasing hormones for the following: TSH Thyroid  growth ACTH Adrenal cortex  homeostasis FSH ovary/seminiferous  sexual dev’p LH ovary & egs/testes estrogrogen/ testosterone fertile GH all organs  blood glucose used for growth (somatotropin) Prolactin Breast tissue  milk production

  12. Hypothalmus affects Pituitary • Posterior Pituitary directly stimulated by neurohormones released from the hypothalmus ADH(vasopressin)  kidney  H2O retention/diuresis Oxytocin  milk ducts and uterine muscle  contraction

  13. Posterior pituitary

  14. Pituitary Gland

  15. Disturbances of the Anterior Pituitary : Hyposecretion Hypopituitarism • May result from the pituitary gland itself or from a disease of the hypothalmus however, the result is the SAME • may occur d/t radiation to the head and neck, trauma, tumors, vascular lesions

  16. Dwarfism • Hypo secretion of GH, TSH, FSH, LH, ACTH • metabolic dysfuction • sexual immaturity • growth retardation • causes: tumors, congenital defects, pit. Ischemia, radiation, surg, brain injury, chemical agents

  17. Dwarfism • May be perm. Or reversible, the gland may be 75% dysfunctional before you see findings

  18. Delayed puberty obesity fine scant hair small bones Loss of libido decreased body temp decreased resistance to colds and infection small stature delayed growth according to scales Assessment:

  19. Disturbances of the Anterior Pituitary : Hypersecretion •  ACTH Cushings’s syndrome ( cover during adrenal cortex discussion) •  GH acromegaly & giantism

  20. Excessive growth of bones and soft tissues enlargment of facial features, tongue, and viscera Skin is warm, moist, coarse and oily Assessment findings

  21. Diagnostic Tests • Skull x-ray may show enlarged pituitary gland • CT/MRI: shows thick long bones • Blood work: may indicate Increased prolactin, GH, and ACTH • urine: hypo: decreased cortisol, gonadotropin, decreased GH

  22. Management: • Hormone replacement therapy is nec. For hyposecretion that isn’t r/t pit. Tumours • Hormone suppression therapy for hormone secreting tumors • ie. Parlodel: inhibits the synthesis and release of ant. Pit. Hormones by the gland

  23. Surgery • Hypophysectomy: Rx. Of choice for pituitary tumors • transphenoidal: entry is gained through the inner aspect of upper lip through the sphenoid sinus

  24. Monitor LOC measure I+O assess for hemorrhage inspect nasal packing for blood and CSF monitor for excess swallowing (hemorrhage) Avoid nose blowing, HT: may lose sense of smell monitor for edema watch for addisons disease and thyroid problems replacement hormones are for life Post -op hypophysectomy

  25. Posterior Pituitary lobe hyposectretion • Diabetes insipidus: deficient production of vasopressin, kidneys excrete large amounts of urinedue to trauma, tumors infections or renal tubules don’t respond to ADH

  26. Posterior Pituitary lobe hyposectretion Assessment & Management • Urine SG 1.001-1.005 4-40 litres • Desmopressin DDAVP synthetic vasopressin (nasal spray) • IM Vasopressin

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