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PITUITARY GLAND Where is it located??? Name its’ 3 parts or sections. What hormones are secreted by the pituitary gland??? Pituitary Gland ANTERIOR PITUITARY SECRETES 6+ HORMONES: ACTH (adrenocorticotropic hormone) release of cortisol in adrenal glands TSH (thyroid stimulating hormone) release of T3 & T4 in thyroid gland GH (growth hormone) stimulates growth of bone/tissue FSH (follicle stimulating hormone) stimulates growth of ovarian follicles & spermatogenesis in males LH (lutenizing hormone) regulates growth of gonads & reproductive activities Prolactin promotes mammary gland growth and milk secretion ANTERIOR HYPER PITUITARY DISORDERS What would happen if you had TOO MUCH secretion of prolactin? Too much release of Lutenizing Hormone (LH)? ANTERIOR HYPER PITUITARY DISORDERS ETIOLOGY Primary: the defect is in the gland itself which releases that particular hormone that is too much or too little. Secondary: defect is somewhere outside of gland i.e. GHRH from hypothalamus TRH from hypothalamus PITUITARY TUMORS 10% OF ALL BRAIN TUMORS What are the diagnostic tests to diagnose a pituitary tumor? tumors usually cause hyper release of hormones ANTERIOR PITUITARYHYPERfunctioning Sing along 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 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, diabetes, HTN, wt. gain, H/A, Visual disturbances, diabetes mellitus GIGANTISM IN CHILDREN ACROMEGALY IN ADULTS What assessment findings would the nurse document? What assessment findings would the nurse document? MEDICAL INTERVENTIONS FOR PITUITARY TUMOR Medications Parlodel (bromocriptine) to ________ & GH levels. Radiation therapy external radiation will bring down GH levels 80% of time Transsphenoidal Hypophysectomy Neurosurgery: procedure called “transsphenoidal hypophysectomy”; New Method Most common method: incision is made thru floor of nose into the sella turcica. Nursing Management Pre op hypophysectomy Anxiety r/t a. body changes b. fear of unknown c. brain involvement d. chronic condition with life long care Sharmyn Sensory-perceptual alteration r/t a. visual field cuts b. diplopia secondary to pressure on optic nerve. Alteration in comfort (headache) r/t a. tumor growth/edema Knowledge deficit r/t Post-op teaching pain control ambulation hormone replacement activity Post operative care Post-op complications of hormone insufficiency: What would happen if you didn’t have enough ADH? What is that disorder called? Other insuffciency: Decrease ACTH will require cortisone replacement due to decrease glucocorticoid production. Can you live without glucocorticoids???? Other deficiency: in sex hormones can lead to infertility due to decrease production of ova & sperm What were those hormones called again?- 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 any clear rhinorrhea - test for glucose + glucose = CSF Leak Notify physician HOB 30 degrees Bedrest CSF leak usually resolves within 72 hrs. If not - spinal taps done to decrease pressure Post op problems cont. Periocular edema/ecchymosis Headaches Visual field cuts/diplopia What is the most important nursing intervention for these problems???? ANTERIOR PITUITARYHypofunction 1. Etiology (rare disorder) may be due to disease, tumor, or destruction of the gland. Diagnostic tests CT Scan Serum hormone levels S & S Anterior Pituitary Hypofunctioning GH FSH/LH Prolactin ACTH TSH Medical Management neurosurgery -- removal of tumor radiation - hormone replacement tumor size cortisol, thyroid, sex hormones 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) Question??? What hormones are released by the posterior pituitary? _____ & _____are released when signaled by hypothalamus ADH (Vasopressin) 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... Under what conditions is ADH released??? ADH has vasoconstrictive or vasodilation action??? ANSWERS: released in response to decrease blood volume, increase concentration of Na+ or other substances, pain, stress ADH has vasocontrictive properties Oxytocin Controls lactation & stimulates uterine contractions ‘Cuddle hormone’ Research links oxytocin and socio-sexual behaviors Posterior Hyper pituitary Disorders SIADH (TOO MUCH ADH!!) lung cancer, Ca duodenum/pancreas, trauma, pulmonary disease, CNS disorders, drugs -- Vincristine, nicotine, general anesthetics, tricyclic antidepressants Think tank: If you are having too much ADH... What would the clinical signs/symptoms be?? Clinical manifestations-SIADH Weight gain or weight loss? or urine output? or serum Na levels? weakness muscle cramps H/A Diarrhea If hyponatremia worsens will develop neuro manifestations lethargy decrease tendon reflexes seizures Diagnostic Tests-SIADH Serum Na+ <135meq/l Serum osmolality <275 OSM/kg H2O urine specific gravity or normal BUN Medical Treatment ***FLUID RESTRICTION LIMIT TO 1000ML/24HRS IV 3% NaCl to replace Na IF CHF -- Lasix (temporary fix) Treat underlying problem --Chemo, radiation Declomycin 600 po-1200mg/day to inhibit ADH Nursing Interventions-SIADH Fluid restriction may be as little as 500600ml/24hrs Daily weights... 1 lb. weight = 500ml fluid retention Accurate I & Os Nursing Management-SIADH F & E imbalances fluid intake High risk for injury r/t complications of fluid overload (seizures) Posterior Hypopituitary ADH disorders Diabetes Insipidus (too little ADH) What do you think the S&S would be if you had too little ADH??? Etiology 50% idiopathic a. central -- i.e. brain tumors b. nephrogenic - inability of tubules to respond to ADH Clinical Manifestations-DI Polydipsia Polyuria (10L in 24 hours) Severe fluid volume deficit wt loss tachycardia constipation shock Diagnostic Tests-DI or or or urine specific gravity serum Na serum osmolality Dehydration test: 2 units of Vasopressin (ADH) mixed in saline administered over 2 hrs then check urine osmolality levels Medical Management-DI Identification of etiology, H & P Tx of underlying problem DDAVP (nasal spray) Pitressin s.c. IM, nasal spray Nursing Management-DI 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