Week 10: Metabolic & Endocrine Disorders Flashcards
Endocrine System
-Network of glands in the body that make hormones
Regulate:
-Mood
-G&D
-Organ functions
-Metabolism
-Reproduction
Endocrine Glands
-Ductless glands that secrete hormones directly into the blood
-Distributed throughout the body
-Each gland secretes different hormones
Hormones: Communication & Coordination
-Each hormone has a different function and works on a specific organ or cell
-Binds to receptors of specific tissue or organ: “target tissue” to cause an effect
(lock and key mechanism)
Hypothalamus & Pituitary (connectors)
Endocrine System:
-Chemical system
-Hormones via blood
-Slower response
-Long term effects
Hypothalamus & Pituitary (connectors)
Nervous System:
-Electrical system
-Nerve impulses
-Rapid response
-Short term effects
Hypothalamus
-A structure that is part nervous system and part endocrine system
-Connects nervous & endocrine systems to coordinate control & regulation of body
-Receives information from receptors throughout the body via the nervous system
-Regulates body’s reaction via the endocrine system, specifically the pituitary gland
Hormones- Regulation (Feedback Loops)
-Keeps hormone levels within a set normal range (self-regulating)
-Negative–↑or↓ secretion of hormone (think thermostat)
-Positive – ↑ the target organ action beyond normal (think oxytocin & labor)
Hormones- Regulation (Biorhythms)
-Rhythmic alterations in a hormone’s rate of secretion
-Circadian rhythm: 24h rhythm, repeats once per day (sleep- wake cycle)
-Monthly rhythm: repeats once per month (menstrual cycle)
Hormones- Regulation (Central Nervous System)
-Helps control the secretion of hormones in 2 ways:
ACTIVATION: of the hypothalamus
STIMULATION: of the sympathetic nervous system
-Emotional centre: impacts endocrine system
Anterior Pituitary Hormones
Thyroid-stimulating hormone TSH:
-stimulates the thyroid gland
Adrenocorticotropic hormone (ACTH):
-stimulates the adrenal glands
Gonadotropins: FSH / LH
* Follicle stimulating hormone
* Luteinizing hormone
-Stimulates the ovaries & testes
Growth hormone GH:
-Acts on bones, muscles, and cells to promote growth of body tissues
Prolactin PRL:
-Acts on mammary glands to stimulate milk production
Posterior Pituitary Hormones
Antidiuretic Hormone ADH:
-Prevents kidneys from excreting excessive amounts of water
Oxytocin:
-Causes the uterine muscles to contract during childbirth
Thyroid and Parathyroid Glands
Thyroid:
-regulates all phases of metabolism
T3 & T4:
-Affects nervous system and G&D
Calcitonin:
-Inhibits loss of calcium from bone
Parathyroid Hormone (PTH):
-Regulates the blood level of calcium
-Renal conversion of vitamin D to its most active form
Adrenal Glands
Adrenal Medulla
-Stimulated by the sympathetic nervous system “fight or flight”
-Emergency/stress situations:
Epinephrine (adrenaline)
Norepinephrine (noradrenaline)
Adrenal Cortex
-Steroids essential for life
Cortisol: regulates blood glucose concentration by stimulating gluconeogenesis
Aldosterone: salt-retaining hormone
Sex Hormones: onset of puberty
Glands- Gonads & Hormones
-Produce hormones needed for the development of sexual characteristics & maintenance of reproductive organs
Pancreas- Regulation of Blood Glucose
Islets of Langerhans- hormone secreting cells
Insulin:
-Breaks down glucose for energy
-Transports glucose into cells
-Stabilizes blood glucose range 4-6 mmol/L
Glucagon:
-Ensures a supply of glucose for busy cells
Converts:
-Glycogen into glucose in the liver & releases into the bloodstream
-Proteins into glucose
Antagonistic Hormones: opposite
Assessment
Hormones affect every tissue and system in the body, causing great diversity in manifestations of endocrine dysfunction
-Endocrine disorders generally result from too much or too little of a specific hormone
-The onset of symptoms is often gradual
-Pts may also present with acute symptoms that are life-threatening
Assessment- Subjective Data
Past health Hx:
-Usually c/o a group of S&S
-Fatigue
-Weakness
-Menstrual irregularities
-Weight changes
Family Hx:
-1st degree relatives with:
-diabetes
-thyroid probs
-endocrine gland cancers
-goitre
Meds
-Rx
-OTC
-Hormone replacement:
insulin, thyroid, prednisone
Surgery or other Tx
-Hospitalizations
-Surgery
-Chemotherapy
-Radiation, esp of the neck
Assessment- Objective Data
Physical Exam:
-Body temp: varies r/t thyroid
-Height & Weight
-Alertness & emotional state
-Hair, skin, nails
-Facial features & eyes
-Neck
Auscultate:
-Heart rate
-Blood pressure
Palpate:
-Extremities for edema
-Skin for texture & temp
-Neck for thyroid size & shape
Diagnostics:
-Blood & urine testing
- K+, Na+
-Glucose & A1C
-Thyroid studies (TSH)
-Ultrasound, x-ray, CT,MRI
Posterior Pituitary Disorders
Posterior Pituitary Gland: antidiuretic hormone (ADH)
-Syndrome of inappropriate antidiuretic hormone (SIADH) (overproduction of ADH)
-Diabetes insipidus (deficiency of ADH)
Syndrome of Inappropriate ADH (SIADH)
-Increased antidiuretic hormone
-Increased water reabsorption in renal tubules
-Increased intravascular fluid volume
-Dilutional hyponatremia and decreased serum osmolality
Most Common Cause in Lung Cancer:
-Head trauma, psychosis, meds, metabolic disease
S&S:
-N&V, abdominal cramps, muscle twitching, seizure
Decreased plasma osmolality & decreased Na+:
-Cerebral edema, low urine output, increase weight
SIADH- Nursing Care
Goal:
restore normal fluid volume and serum osmolality
If Severe:
-IV hypertonic saline solution 3-5%
If chronic:
-Water restriction 800-1000 ml/d
Frequent Measurement:
-Daily weight
-I&O
-Urine specific gravity
-VS
-Lung sounds
-LOC
-S&S of hyponatremia
Diabetes Insipidus
Occurs suddenly:
-Increased thirst, nocturia
-Polyuria: 5-20 L/day
-Fatigue & weakness
Fluid Deficit Results In:
-Wt loss
-Constipation
-Poor skin turgor
-Hypotension
-Tachycardia
-Shock
-CNS S&S
Decreased Antidiuretic Hormone
-Decreased water reabsorption in renal tubules
-Decreased intravascular fluid volume
1.)increased serum osmolality (hypernatremia)
2.)excessive urine output
Diabetes Insipidus- Nursing Care
Goal: maintenance of fluid & electrolyte balance
-Fluid & hormone replacement is cornerstone of tx
-Acute
* hypotonic saline – IV 0.45% NS
* Desmopressin acetate (ADH replacement)
-Long term
* Desmopressin acetate
Monitoring:
-daily weight
-I&O
-Urine specific gravity
-VS
-LOC
-S&S of dehydration
Thyroid Disorder: Goitre
-Abnormal growth of thyroid gland
-Manifestation of thyroid disorders
Thyroid Disorder: Thyroiditis
-Viral, bacterial or fungal infection
-Autoimmune (Hashimoto’s)
Thyroid Disorders: Hyperthyroidism
-↑ thyroid hormone
-Grave’s disease
Thyroid Disorders: Hypothyroidism
-↓ thyroid hormone
-Tx with Synthroid
Thyroiditis
Acute:
-thyroid gland is tender & enlarged
-Neck pain & fatigue
Chronic Autoimmune:
-Hashimoto’s thyroiditis
-Most common in women
-Can lead to hypothyroidism and goitre
Treatment:
-Depends on type
-Salicylates & NSAIDs
-corticosteroids
Hyperthyroidism – Graves’ Disease
Autoimmune disease of unknown etiology marked by diffuse thyroid enlargement and excessive thyroid hormone secretion
-Thyrotoxicosis
Signs & Symptoms
-Heat intolerance & excessive sweating
-Tachycardia
-Weight loss
-Tremors
-Goitre
-Exophthalmos
Exophthalmos
Impaired venous drainage
Increased fat deposits & edema behind the eyeball
Eyeballs are forced outward & protrude
Grave’s Disease: Collaborative Care
Goal is to block the adverse effects of thyroid hormones and stop their oversecretion
Diagnostics:
-Bloodwork
-TSH levels
* free T4
-24h radioactive iodine uptake (RAIU) test
Therapies:
-Radioactive iodine
-Subtotal thyroidectomy – 90%
-Nutritional: frequent, high- calorie, high- protein
Medication:
-Antithyroid
-Tapazole
-Propyl-Thyracil
-Iodine
-Inderal