Endocrine Flashcards Preview

Step 1 > Endocrine > Flashcards

Flashcards in Endocrine Deck (139)
Loading flashcards...
1

Normal migration of thyroid gland?

Thyroid gland is out pouching or pharyngeal epithelium that descends into the neck. Connected to tongue by thyroglossal duct. The foramen cecum is the dorsal surface of tongue and is a remnant.

2

Presentation of thyroglossal duct cyst?

Anterior midline neck mass that moves with swallowing o r tongue movt

3

Lingual thyroid

If only thyroid tissue present, removal could lead to hypothyroidism (in children lethargy, jaundice, feeding problems, constipation)

4

Congenital adrenal hyperplasia etios

21-hydroxylase deficiency - most common; dec. glucocorticoids and mineralocorticoids with increased adrenal androgens; 11B-hydroxylase - decreased glucocorticoids and inc. adrenal androgens; 17a-hydroxylase - nl mineralo, dec. androgens, estrogens, cortisols; 5a-reductase - defective conversion of testosterone to dihydrotestosterone (responsible for fusion); Side chain cleavage - conversion of chop to pregnenolone; impaired synthesis of all steroid hormones; Tx = low-dose corticosteriods to suppress ACTH secretion

5

MEN I

3 P's - (hyper)Parathyroidism, Pancreas (gastrinoma -> peptic ulcer), Pituitary adenoma. Commonly presents with kidney stones + stomach ulcers.

6

Treatment for male pattern baldness?

5-alpha-reductase inhibitors (e.g. finasteride) b/c it is thought that enzyme in scalp doesn't work that well

7

Salt-wasting v. non-salt-wasting 21-hydroxylase deficiency presentations

Girls - same; birth with ambiguous genitalia
Boys - Salt-wasting will present at 1-2 weeks with FTT, dehydration, hyperkalemia, and hyponatremia. Non-salt-wasting will present at 2-4 yrs with early virilization.

8

What enzyme converts Vitamin D into active form?

1-alpha hydroxylase. Resides in kidneys.

9

Adrenal gland subdivisions?

Cortex - zona glomerulosa (mineralocorticoids,aldo), zona fasciculata (glucorticoids, cortisol), zona reticularis (androgens); GFR = ACA
Medulla

10

Be wary of what side effects by which thyroid drugs?

Agranulocytosis by methimazole or PTU. WBC w/ diff for fever

11

Thyroid peroxidase?

Oxidation of iodide to iodine, iodination of thyroiglobuline tyrosine, and iodotyrosine coupling that forms T3, T4. TPO ab's for Hashimoto's.

12

Papillary carcinoma of thyroid FNA

Finely dispersed chromatic, ground-glass (Orphan Annie Eye), w/ intranuclear inclusions and grooves, and psammoma bodies.

13

Mech of hypoglycemia symptoms?

Inc. secretion of epinephrine and NE lead to sweating, tremor, palpitations, hunger, nervousness. CNS symptoms later b/c higher brain center activity decreases to conserve glucose -> behavior, confusion, stupor, seizures. Selective Beta-blockers preferable in diabetics b/c Beta-2 blockade leads to inhibition of gluconeogenesis, glycogenolysis, and lypolysis

14

Congenital Hypothyroidism

Lethargy, poor feeding, prolonged jaundice, constipation, hypotonia, hoarse cry. Pale, dry skin w/ myxedema, MACROglossia. Umbilical hernia. Higher incidence of ASD/VSD.

15

Neurophysin

Carrier proteins for oxytocin (paraventricular nuclei) and ADH (supraoptic nuclei) produced in hypothalamic nuclei. Help shuttle them to posterior pituitary. Mutation in neurophysin II for vasopressin thought to be cause of AD diabetes insipidus.

16

Path of Hashimoto's?

Mononuclear, parenchymal infiltration w/ well-developed germinal centers

17

Pheochromocytoma rule of 10's

10% occur as part of hereditary (MEN2, VHL), 10% b/l, 10% are extra-adrenal, 10% malignant. Tumor of chromatin tissue of adrenal medulla that increases production of NE and EPI.

18

Endogenous opioids?

Beta-endorphin is one derived from proopiomelanocortin (also precursor to ACTH). Stress axis ~ opioid.

19

Path findings in pancreas for DMT2?

Deposits of amylin (an amyloid) found in pancreatic islets. Theory: lead to beta cell apoptosis and defective insulin secretion

20

How to distinguish between where alkaline phosphatase is coming from?

Bone-specific Aphos is denatured by heat. Liver APhos does not.

21

Achondroplasia

AD. FGFR-3 point mutation leading to increased INHIBITION of cartilage proliferation. Normal trunk, shortened proximal extremities, enlarged head and frontal bossing.

22

Glucagonoma

Alpha-cells of pancreatic islets. Necrolytic migratory erythema, Hyperglycemia.

23

VIPoma

Intractable diarrhea, metabolic acidosis, hypokalemia

24

Somatostatinoma

Tumor of pancreatic delta-cells. Abdominal pain, gallbladder stones, constipation, steatorrhea. 2/2 to somatostatin's inhibitory effects of insulin, glucagon, gastrin, cholecystokinin, and secretin secretion.

25

Gastrinoma

Neuroendocrine tumor. JEJUNAL ulcer.

26

Metyrapone test

11-Beta-hydroxylase inhibitor. Test for integrity of HPA axis. B/c 11-deoxycortisol builds up and doesn't inhibit ACTH, ACTH will be released leading to a build-up of 17-hydroxycorticosteroids, which are detected as normal HPA axis.

27

Cells of the adrenal medulla?

Chromaffin cells

28

Adrenal vein venous drainage?

Same as gondal veins. Right adrenal vein goes straight into IVC whereas L adrenal vein goes to L renal vein then IVC.

29

Anterior pituitary secretes what hormones?

FSH, LH, ACTH, TSH, prolactin, GH, melanotropin

30

Three types of pancreatic cells and where are they located?

alpha = glucagon (peripheral). Beta = insulin (central). Delta = somatostatin (interspersed)