Exam 3- endocrine, DM, hematology Flashcards
Negative feedback mechanism
signals an endocrine gland to secrete a hormone in response to a body change to oppose the action of the change and restore homeostasis
Hypothalamus
Main boss- controls pituitary glands
Function is to produce regulatory hormones
Hormones:
Corticotropin-releasing hormone (CRH)
Thyrotropin-releasing hormone (TRH)
Gonadotropin-releasing hormone (GnRH)
Growth hormone releasing hormone (GHRH)
Growth hormone inhibiting hormone
Prolactin inhibiting hormone (PIH)
Pituitary gland
Divided into anterior and posterior lobes
Releases tropic hormones (hormones that stimulate other endocrine glands) in response to hypothalamus hormones
Anterior pituitary hormones and target organ
Thyroid stimulating hormone- thyroid
Adrenocorticotropic hormone- adrenal cortex
Luteinizing hormone- testes and ovaries
Follicle stimulating hormone- testes and ovaries
Prolactin- breast
Growth hormone- bone and soft tissues
Posterior pituitary hormones and target organs
Vasopressin (antidiuretic hormone)- kidneys
Oxytocin- uterus and breast
Adrenal gland
Tent shaped organs on the top of each kidney
Adrenal cortex and adrenal medulla
Adrenal cortex
Composes 90% of gland
Secretions regulated by adrenocorticotropic hormone (ACTH)
Hormones are called corticosteroids (adrenal steroids)
Aldosterone
promotes sodium and water reabsorption and potassium excretion
Regulated by RAAS, serum potassium level, ACTH
Cortisol
Released when you are stressed
Affects carbohydrate, protein and fat metabolism; emotional stability; immune
function; sodium and water balance
Regulated by levels of free cortisol, normal sleep-wake cycle, and stress
Release peaks in the morning
Adrenal medulla
1/10 of the gland
Stimulated by sympathetic nervous system (stimulates fight or flight response)
Norepinephrine and epinephrine
Thyroid gland
2 lobes on each side of the trachea- looks like a butterfly
Stimulated by TSH (thyroid stimulating hormone)
Iodine is needed to produce the hormones (salt)
Controls metabolism
Affects resp rate, HR and contractility of heart
Thyroid gland hormones
Thyroxine (T4)
Made first- converted to T3 with help of table salt (iodine)
Maintains body metabolism in steady state
Triiodothyronine (T3)
T4 converts to T3 in the cell
Increases metabolic rate
Decreases in older persons
Calcitonin (thyrocalcitonin)
Regulates serum calcium and phosphorus
Reduces bone resorption (breakdown)
Secreted when calcium is elevated
Pulls calcium from blood back into the bone
Parathyroid gland
4 small glands located close to or with in thyroid
Parathyroid hormone (PTH)
Regulates calcium and phosphorus metabolism
Acts on kidneys, bone, and GI tract
Takes calcium from bone to the blood
Activates vitamin D in kidneys to increase absorption of calcium
Pancreas
Located behind stomach Insulin from beta cells lowers blood glucose Glucagon from alpha cells Increases blood glucose Somatostatin from delta cells Inhibits secretion of glucagon and insulin
Important assessment with endocrine
Height, weight, and VS
Laboratory tests for endocrine
Stimulation/suppression test Assays- measure level of specific hormone in blood and other body fluids Urine test Tests for glucose Imaging- MRI, US, CT
Anterior pituitary hormones
Growth hormone
Thyroid stimulating hormone
Adrenocortictropic hormone
Hypopituitarism
Deficiency of 1 or more anterior pituitary hormones
Decrease GH in adults- increase rate of bone destruction leading to thinner bones (osteoporosis) and increase risk for fractures
Hyperpituitarism
Over secretion of anterior pituitary hormones Increase GH in adults- acromegaly Thickened lips Coarse facial features Increase head size Lower jaw protrusion Enlarged hands and feet Joint pain Barrel chest Hyperglycemia Sleep apnea Enlarged heart, lungs, and liver Some changes may be reversible but skeletal changes are permanent
Hyperpituitarism
Treatment
Bromocriptine
Hypophysectomy
Bromocriptine
dopamine agonists
Stimulates dopamine receptors and inhibits release of GH
Side effects- orthostatic hypotension, headache, nausea, abdominal cramps, constipation
Take with food
If pregnancy occurs stop immediately
Hypophysectomy
Surgical removal of pituitary gland
Nasal packing present for 2-3 days after surgery- necessary to mouth breath
Mustache dressing will be placed under the nose
Do not brush teeth, cough, sneeze, blow nose or bend forward after surgery
Monitor neurologic response
Post nasal drip or increase swallowing- cerebrospinal fluid leakage
Keep HOB elevated
Assess nasal drainage
Halo sign indicates CSF- light yellow color at the edge of clear drainage on dressing
Most CSF leaks resolve with bedrest
Deep breathing hourly
Rinse mouth frequently
Apply lubricating jelly to dry lips
Assess for meningitis- headache, fever, neck rigidity!!!!!!!!
Posterior pituitary disease
Vasopressin (ADH)
Low- Diabetes insipidus (DI)
High- SIADH
Diabetes insipidus
Water loss caused by ADH deficiency or inability of the kidneys to respond to ADH
Diabetes insipidus
Symptoms
Polyuria
Dehydration
Increase plasma osmolarity and sodium- stimulates sensation of thirst
Urine is diluted- low specific gravity <1.005
4-30 L of urine/day
Diabetes insipidus
Interventions/treatment
Can't be NPO for more than 4 hours Daily weight 24 hour urine Desmopressin- synthetic vasopressin Maintain adequate hydration
SIADH
ADH continues to be secreted when not needed- water retention
Decrease sodium can lead to seizures
SIADH
symptoms
Decrease urine volume; Increase urine osmolarity Weight gain Changes in LOC VS changes Bounding pulse Increase BP Decrease DTR
SIADH
interventions/treatments
Fluid restriction- frequent mouth rinsing
Monitor for fluid overload- I&Os; daily weights
Flushes tubes with NS instead of water (for the sodium)
Sodium tablets
Tolvaptan (PO) or Conivaptan (IV)- vasopressin antagonists
Pull out water- Do not touch sodium- Do not use longer than 30 days
When sodium levels are near normal can use normal diuretic
Adrenal cortex disease
Aldosterone- Na and H2O retention; K Excretion
Cortisol- Cholesterol, protein, and fat metabolism; Glucose
Low- Addisons
High- Cushings
Addisons disease
Caused by inadequate secretion of ACTH, dysfunction of hypothalamic-pituitary control mechanism, or dysfunction of adrenal tissue Hyponatremia Hypovolemia Hyperkalemia Hypoglycemia
Addisons disease
symptoms
Neuromuscular- fatigue, lethargy, joint/muscle pain
GI- abdominal pain, N/V, diarrhea, anorexia
Salt craving
Skin- primary insufficiency; increased pigmentation
primary autoimmune; vitiligo (decreased pigmentation)
secondary insufficiency; no skin color changes
Hypoglycemia- sweating, headache, tachycardia, tremors
Hyperkalemia- dysrhythmias, irregular HR
Hyponatremia- decreased cognition and BP; often 1st indicator
Addisons disease
interventions/treatment
Initiate H2 histamine blocker IV for ulcer prevention Administer insulin with dextrose to shift K+ into cells Loop or thiazide diuretics Monitor HR, rhythm, and ECG IV glucose Hourly blood glucose Cortisone Hydrocortisone Prednisone Fludrocortisone
Cortisone
Take with meal or snack
Hydrocortisone
Report s/s of excessive drug therapy (cushing syndrome)
Prednisone
Report illness- daily dose not adequate during illness or stress
Fludrocortisone
Monitor BP
Report weight gain and edema
Cushing syndrome
Increase Na
Increase fluid
Increase glucose
Cushing disease
symptoms
Buffalo hump Enlarged trunk with thin arms and legs Round face- moon face Muscle wasting and weakness Thin/translucent skin Full bounding pulse Increase BP Edema
Cushing disease
intervention/treatment
Focus on pt safety
Ketoconazole- decrease cortisol production
Fluid and sodium restriction
Monitor I&Os- daily weights
Hypophysectomy- removal of pituitary gland
Adrenalectomy- Removal of adrenal gland
Hypothyroidism
Decrease metabolism
Water and mucous deposits in the body- myxedema
Myxedema come- thyroid crisis
Hypothyroidism
symptoms
Muscle movement slows Cold intolerance Decreased libido Facial puffiness Goiter (enlarged thyroid) Thick tongue Weight gain Impaired memory Nonpitting edema
Hypothyroidism
Treatment
Levothyroxine- synthetic hormone replacement
Start with low dose and gradually increase
Given IV with myxedema coma
Final dose determined by levels of TSH
Taken in the AM on empty stomach
4 hours before or after meal
Hyperthyroidism
Excessive hormone secretion from thyroid
Increased metabolism
Can be temporary or permanent
Graves disease- most common
Hyperthyroidism
symptoms
Palpitations Photophobia (sensitive to light) Weight loss; increased appetite Heat intolerance Increased libido Low grade fever Manic Exophthalmos- wide eyed/startled look Hyperglycemia
Hyperthyroidism
treatment
Reduce stimulation Promote comfort Drug therapy Beta blockers- treats symptoms Antithyroid drugs- methimazole/propylthiouracil Iodine preparations- Lugol solution Radioactive iodine (RAI) therapy Total or subtotal thyroidectomy
Methimazole/Propylthiouracil
Avoid crowds and people who are ill
Watch for indications of hypothyroidism
Do not take when pregnant- birth defects
Propylthiouracil- watch for liver failure
Lugol solution
Initially can increase production of thyroid hormones
Check for fever, rash, metallic taste, mouth sores, sore throat, GI distress
Radioactive iodine (RAI) therapy
Use toilet not used by others for at least 2 weeks
Flush toilet 3 times
Use a laxative on second or third day
Avoid contact with pregnant women, infants, and young children for first week
Total or subtotal thyroidectomy
VS every 15 minutes till stable then every 30 minutes
Use pillows to support head and neck
Avoid neck extension
Deep breathing every 30 minutes to 1 hour
Keep emergency tracheostomy equipment in room
Monitor for thyroid crisis- fever, tachycardia, systolic HTN
Hypoparathyroidism
Decrease function of parathyroid
Hypocalcemia; Hyperphosphatemia
Hypoparathyroidism
symptoms
tingling and numbness
muscle contractions
positive chvostek and trousseau sign
Hypoparathyroidism
interventions/treatment
Correcting hypocalcemia, vitamin D deficiency, hypomagnesemia
High calcium Low phosphorus diet
Avoid milk, yogurt, processed cheese
Hyperparathyroidism
Increase function of parathyroid
Hypercalcemia; Hypophosphatemia
Hyperparathyroidism
interventions/treatment
Diuretics and hydration therapy
Parathyroidectomy
Euglycemia
Normal blood glucose
Type 1 DM
Insulin dependent- produce no insulin
Insulin given subQ everyday
Type 2 DM
Non insulin dependent- produces insulin just not enough