Exam 2 Flashcards
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What does the RAAS do?
BP(renal perfusion) drops, which increases renin levels, renin cleaves aniotensinogen to Angiotensin I which is converted by ACE to angiotensin II, AGII increases aldosterone, causes vasoconstriction and increases BP
What occurs with a 21-hydroxylase deficiency
cholesterol prodcuts are shunted away from mineralcorticoids and corticosteroids into the androgen pathway, this leads to low BP, hypoglycemia, weakness and virilization
What is 17-hydroxyprogesterone used to test for?
CAH or 21-hydroxylase defiency
What is the treatment for CAH?
hydrocortisone, fluids/glucose and decrease the potassium
What endocrine diseases are screened for in Missouri?
CAH and primary congenital hypothyroidism
What are the main causes of primary adrenal insufficiency?
Autoimmune adrenal destruction, TB is the most common infection, BAH due to Waterhouse-Friderichsen syndrome
What does increased ACTH cause on presentation?
increased pigmentation
What AR adrenal disease is familial?
familial glucocorticoid deficiency leading to decreased responsiveness to ACTH and it then increases
What are the possible deficiencies in CAH?
21-hydroxylase, 17-a-hydroxylase, 11-b-hydroxylase
How do patients present with primary adrenal insufficiency?
fatigue, weakness, anorexia, weight loss, hyperpigmentation(due to increased MSH), may have abdominal pain, N/V, MSK pain, psychiatric Sx, HA, sal craving, low BP, female infants will have virilization
What are the lab findings in primary adrenal insufficiency?
low Na, high K, hypoglycemia, hypercalcemia(decreased renal function), low morning cortisol with high ACTH
What test can confirm primary adrenal insufficiency?
cosyntropin test(sythnthetic ACTH), cortisol levels should increase after test
What lab findings are present with autoimmune Addison disease?
Ab to 21-hydroxylase
What lab finding is present in secondary adrenal insufficiency?
Low ACTH with low cortisol
What causes Cushing syndrome and what are the Sx?
excessive corticosteroids, central obesity, moon facies, buffalo hump, abdominal striae
What causes Cushing syndrome?
ACTH increase from the pituitary(adenoma)
What are 2 causes for ACTH-independent Cushing syndrome?
exogenous corticosteroids, adrenocortical tumor
What is McCune-Albright syndrome?
polyostotic fibrous dysplasia, cafe-au-lait spots, endocrine hyperfunction from multiple organs, causes bilateral adrenal hyperplasia
What is an easy screening test for Cushing syndrome?
dexamethasone suppression test
How is the dexamethasone suppression test interpreted?
low ACTH, not suppressed, primary hypercortisolism
elevated ACTH, not suppressed, ectopic ACTH
normal ACTH, suppressed by high dose, cushing disease
What are signs of primary hyperaldosteronism?
high aldosterone not suppressed with sodium loading
patients are hypertensive, and refractory to treatment
What is Conn syndrome?
primary hyperaldosteronism secodnary to unilateral adrenal adenoma, 40% ahve K channel gene mutation
What are signs and symptoms of primary aldosteronism?
HTN, hypokalemia, metabolic alkolosism lose protons with K
What is found in Von Hippel-Lindau disease type 2?
pheochromocytomas in 20%, AD disease, hyperthyroidism, adnexal tumors, renal cysts, adenomas, carcinomas, hemangiomas