Endocrine Flashcards
Posterior pituitary hormones
vasopressin (ADH) and oxytocin
Anterior pituitary hormones
FLAT PiG
FSH, LH, ACTH, TSH, Prolactin, GH
Organs that don’t need insulin for glucose uptake
BRICK L
Brain, RBCs, Intestine, Cornea, Kidney, Liver
Brain and RBCs take up glucose via…
GLUT-1 receptor
Secretion of what inhibits prolactin
Dopamine
Somatostatin inhibits…
GH, TSH
Prolactin inhibits…
GnRH
Used in treatment of prolactinoma
Dopamine agonists (ex. bromocriptine)
Meds that stimulate prolactin secretion
Dopamine antagonists (antipsychotics) and estrogens (OCPs, pregnancy)
17 alpha-hydroxylase deficiency
Dec cortisol & sex steroids, Inc mineralocorticoids
HTN, hypoK
XY: male pseudohermaphroditism (outside female, inside male)
XX: lacks secondary sex characteristics
21 hydroxylase deficiency
Dec mineralo & cortisol, Inc sex steroids
HypoTN, hyperK, increased renin, volume depletion, masculinization, female pseudohermaphroditism
11 beta-hydroxylase deficiency
Dec aldosterone, Inc 11-deoxycorticosterone, Dec cortisol, Inc ss
HTN, masculinization
Fxn of cortisol
BBIIG
- Maintain BP (upreg alpha-1 receptors on arterioles)
- dec Bone formation
- Anti-Inflammatory/Immunosuppressive
- increase Insulin resistance
- increase Gluconeogenesis, lipolysis, proteolysis
Fxn of PTH
- Inc bone resorption of Ca & phosphate
- Inc kidney reabsorption of Ca in DCT
- Dec kidney reabsorption of phosphate
- Inc 1,25-(OH)2 vitamin D production
Fxn of vitamin D (cholecalciferol)
- Inc absorption of dietary Ca and phosphate
- Inc bone resorption of Ca and phosphate
Wolff-Chaikoff effect
reduction in thyroid hormone levels caused by xs ingestion of iodine, thus inhibiting thyroid peroxidase and organification
Cushing’s syndrome causes
Exogenous (iatrogenic) steroids Endogenous causes: 1. Cushing's disease (70%) 2. Ectopic ACTH (15%) 3. Adrenal (15%)
Distinguish Cushing’s dz vs ectopic ACTH via…
high dose dexamethasone test
Conn’s syndrome
aldosterone-secreting adrenal adenoma
Primary hyperaldosteronism sx
HTN, hypoK, met alkalosis, low plasma renin
Secondary hyperaldosteronism sx
HIGH plasma renin
Secondary hyperaldosteronism 2/2…
renal a. stenosis chronic renal failure CHF cirrhosis nephrotic syndrome fibromuscular dysplasia
Addison’s disease
chronic primary adrenal insufficiency d/t adrenal atrophy or destruction by disease
Addison’s disease sx
hypoTN, hyperK, acidosis, skin hyperpigmentation
Waterhouse-Friderichsen syndrome
acute primary adrenal insufficiency d/t adrenal hemorrhage associated with N. meningitidis septicemia, DIC, and endotoxic shock
Dx of pheochromocytoma
Increased serum metanephrines and 24h urine metanephrine/VMA
Most common tumor of adrenal medulla in adults
pheochromocytoma
Pheochromocytoma associated with
neurofibromatosis type 1
MEN types 2A and 2B
VHL disease