Exam 1 Flashcards
Hyperprolactinemia hormone changes and organ
Increase prolactin
Organ- pituitary gland
Acromegaly hormone changes and organ
Hormone changes- increase growth hormone
Organ- pituitary gland
Cushing’s disease hormone changes and organ
Hormone changes- increase glucocorticoids (cortisol)
Organ- adrenal gland
Growth hormone deficiency hormone changes and organ
Hormone changes- decrease growth hormone
Organ- pituitary gland
Addison’s disease hormone changes and organ
Hormone changes- decrease glucocorticoids (cortisol), decrease mineralocorticoids (aldosterone)
Organ- addison’s disease
Hyperaldosteronism hormone changes and organ
Hormone changes- increase mineralocorticoids (aldosterone)
Organ- adrenal gland
What is prolactin regulated by?
Regulated by inhibitory effects of dopamine
Prolactin secretion
Secreted in a pulsatile fashion
Prolactin promotes what?
Lactation, breast development, and reproductive function
Hyperprolactinemia
Persistent prolactin concentrations >25 mcg/L
Most commonly affects women ages 24-35 with about 24 cases per 1,000 person years
Etiology of hyperprolactinemia
Pituitary tumors Drug-induced (dopamine antagonists) CNS lesions Hypothyroidism Idiopathic
Drug induced hyperprolactinemia
Dopamine antagonists- antipsychotics, metoclopramide
Prolactin stimulators- estrogens, progestins, SSRIs, 5HT1 receptor agonists, Benzos, MAO inhibitors, TCAs, opioids, H2 receptors antagonists
Other- verapamil
Hyperprolactinemia clinical presentation female
menstrual cycle changes: oligomenorrhea or amenorrhea Galactorrhea Infertility Decreased libido Hirsutism Acne
Hyperprolactinemia clinical presentation male
Decreased libido Erectile dysfunction Infertility Reduced muscle mass Galactorrhea Gynecomastia
Clinical sequelae of hyperprolactinemia
Osteoporosis, ischemic heart disease
Hyperprolactinemia medications
Cabergoline
Bromocriptine
Cabergoline
MOA: long acting D2 receptor agonist
First line- shown to be more effective than bromocriptine
0.25-0.5 mg WEEKLY or twice weekly
Increase at 4 week intervals based on prolactin levels
AE of cabergoline
GI: Nausea, vomiting, constipation
CNS: headache, dizziness, anxiety, depression
Nasal decongestion
Dose adjust for hepatic failure
Bromocriptine
MOA: D2 receptor agonist
1.25-2.5mg QD at bedtime
Increase weekly based on prolactin levels
Bromocriptine AE
CNS: headache, lightheadedness, dizziness, nervousness, fatigue
GI: nausea, abdominal pain, diarrhea (administer WF)
Pregnancy with hyperprolactinemia treatment
Recommend discontinuing cabergoline or bromocriptine
Hyperprolactinemia monitoring and follow-up
Prolactin levels every 3-4 weeks until stable then every 6-12 months
Assess symptoms
After 2 years of treatment may be tapered or discontinued in the absence of visible tumor
Growth hormone
GH has direct anti-insulin effects
Growth-promoting effects mediated by insulin-like growth factors (ICF’s), which directly stimulate cell proliferation and growth
Growth hormone secretion
Secreted by anterior pituitary in pulsatile fashion
Acromegaly
Excessive GH production
Etiology: GH-secreting pituitary tumor
Acromegaly clinical presentation
Slow developing soft-tissue overgrowth
Often not diagnosed until 7-10 years after GH secretion is thought to have started
Symptoms:
local effects from tumor- HA, visual disturbances
Excessive sweating, neuropathies, joint pain, paresthesias
Increased hand volumes, increased ring or shoe size, coarsening of facial features
GH concentrations >1mcg/L following oral glucose tolerance test
IGF-1 elevation
Acromegaly clinical sequelae
CV disease- HTN, CAD, cardiomyopathy, left ventricular hypertrophy Osteoarthritis and joint damage Respiratory disorders and sleep apnea Type 2 diabetes Esophageal, colon, and stomach cancers
Management of acromegaly
Transsphenoidal surgery (most patients) Persistent disease/incomplete surgery- Medications -SRL, DA, Pegvisomant Consider SRT (conventional radiation) if not medication candidate
Somatostatin analogs
1st line for acromegaly
Octreotide, lancreotide, pasireotide
IM every 28 days
Somatostatin analogs AE
GI: diarrhea, nausea, abdominal cramp, malabsorption of fat, flatulence- subside within 10-14 days Arrhythmias Subclinical hypothyroidism Biliary tract disorders Abnormalities in glucose metabolism
Dopamine agonists
Acromegaly treatment
Bromocriptine and cabergoline
MOA: causes paradoxical decrease in GH
Dosing: similar to hyperprolactinemia, but doses may be higher
Pegvisomant
Acromegaly treatment
MOA: genetically engineered GH derivative that binds to, but does not activate GH receptors and inhibits IGF-1 production
Only affects IGF-1 levels not GH
Pegvisomant AE
GI: nausea, diarrhea
Reversible LFT elevation (monitor)
Growth hormone deficiency
Also known as growth hormone deficiency short stature
Etiology:
Absolute deficiency- congenital from various genetic abnormalities
GH insufficiency- hypothalamic or pituitary tumors, cranial irradiation, head trauma, pituitary infarction, CNS infections, hypothyroidism, poorly controlled diabetes, medications (glucocorticoids, methylphenidate, and dextroamphetamine)
Growth hormone deficiency clinical presentation
Physical height greater than two standard deviations below the population mean
Delayed skeletal maturation, central obesity, immaturity of the face
Peak GH concentration <10mcg/L
Growth hormone deficiency treatment
Recombinant GH (rhGH) or somatropin Dosing 0.1-0.2 mg/day and titrate based on IGF-1 levels every 1-2 months F/U 6-12 months for maintenance
Hormones in adrenal cortex:
Zona glomerulosa
Makes aldosterone
Hormones in adrenal cortex: Zona fasciculata
Makes cortisol
Hormones in adrenal cortex: Zona reticularis
Makes testosterone
Addison’s disease, primary adrenal insufficiency
Primary adrenal insufficiency- deficiencies in cortisol, aldosterone, and androgens
Etiology: Autoimmune destruction of all regions of adrenal cortex, medications
Primary adrenal insufficiency, Addisons disease medications causes
Ketoconazole
Phenytoin
Rifampin
Phenobarbital
Secondary adrenal insufficiency, Addison’s disease
Secondary adrenal insufficiency- decreased glucocorticoid production secondary to decreased ACTH levels
Etiology:
Exogenous steroid use, mirtazapine, progestins (medroxyprogesterone and megestrol)
Clinical presentation of addison’s disease
Hyperpigmentation
Weight loss
Dehydration
Hyponatremia
Elevated BUN
Secondary- aldosterone secretion is preserved
Abnormal response to corticotropin stimulation test
Corticotropin stimulation test
250mcg of ACTH (corticotropin or cosyntropin) IV or IM
Serum cortisol measured at baseline and 30-60 minutes after injection
Cortisol levels >18 mcg/dL rules OUT adrenal insufficiency
CANNOT use for critically ill patients
Addison’s disease treatment
Glucocorticoid replacement
-Hydrocortisone, cortisone, prednisone
15-25mg hydrocortisone 67% in AM and 33% 6-8 hours later
Adjust every 6-8 weeks based on symptoms
Fludrocortisone 0.05-2 mg daily in primary insufficiency
Addisons disease treatment: Patient education
Consequences of missed doses
Drug side effects
Expected outcomes
Treatment complications
Exercise –> additional 5-10mg hydrocortisone
Sick day management –> double daily dose
Addison’s disease monitoring and follow up
Every 6-8 weeks
Relief of symptoms
Avoid development of Cushing syndrome features
Cushing’s syndrome
Excessive cortisol production
Etiology:
Exogenous administration
Endogenous:
-ACTH-dependent (pituitary adenomas, ectopic ACTH- secreting tumor)
-ACTH-independent (adrenal adenomas, adrenal carcinomas)
Cushing’s syndrome: clinical presentation
Central obesity, facial rounding, myopathies, muscular weakness, buffalo hump, HTN, osteoporosis, amenorrhea, hirsutism
Hyperaldosteronism clinical presentation
Muscle weakness, fatigue, parethesias, headache, HTN, tetany/paralysis, polydipsia/nocturnal polyuria
Hyperaldosteronism treatment
Aldosterone receptor antagonists
Amiloride
Eplerenone
Spironolactone
Hyperthyroidism etiology
Overproduction of T3 and T4 by thyroid gland Women > Men Most common in ages 20-39 Etiology: Graves disease- most common TSH induced TSH secreting pituitary adenomas Pituitary resistance to thyroid hormone Trophoblastic diseases Toxic adenoma Multinodular goiters
Hyperthyroidism evaluation
Radioactive iodine uptake (RAIU) test
Increased RAIU= overproduction of T3 and T4
Decreased RAIU- excess T3 and T4 not due to overproduction
Total T4 normal value
4.8-10.4 mcg/dL
Free T4 normal value
0.8-1.4 ng/dL
Total T3 normal value
59-156ng/dL
TSH normal value
0.45-4.12 mcgIU/mL
RAIU at 24 hrs normal value
5-35%
Thyroglobulin autoantibodies normal value (Tg-Ab)
<200 IU/mL
Thyroid peroxidase autoantibodies (ATPO) normal values
<100 WHO units
TSH receptor-stimulating antibody normal value
Negative <140% of baseline
Hyperthyroidism clinical presentation
Eyelid retraction Thyroid dermopathy Thyroid acropachy Nervousness Anxiety Palpitations Emotional lability Easy fatiguability Menstrual disturbances Heat intolerance Weight loss with increased appetite