Endocrine 6% Flashcards
Primary Hyperparathyroidism =
MC cause =
excess (inappropriate) PTH production
Parathyroid Adenoma
MEN I
MEN IIa
MEN I = HyperPTH, Pituitary Tumors, Pancreatic Tumors
MEN IIa = HyperPTH, Pheochromocytoma, Medullary Thyroid Carcinoma
Secondary Hyperparathyroidism =
MC cause =
Increased PTH in response to hypocalcemia or vit D deficiency
Chronic kidney failure: d/t hyperphosphatemia –> increased ionized Ca, decreased renal production of active vit D
Primary hyperparathyroidism: (Increased/decreased) DTR (Increased/decreased) Ca (Increased/decreased) PTH (Increased/decreased) phosphate (Increased/decreased) 24 hr urine calcium excretion Increased/decreased) vit D
Primary hyperparathyroidism: DECREASED DTR INCREASED Ca INCREASED PTH DECREASED phosphate INCREASED 24 hr urine calcium excretion INCREASED vit D
Tx of primary hyperparathyroidism
Tx of secondary hyperparathyroidism
Primary: Parathyroidectomy
Secondary: Vit D, Ca supplementation
MC causes of hypoparathyroidism (2)
Postsurgical
Autoimmune
Hypoparathyroidism: (Increased/decreased) DTR (Increased/decreased) Ca (Increased/decreased) PTH (Increased/decreased) phosphate
INCREASED DTR
DECREASED Ca
DECREASED PTH
INCREASED phosphate
Hypocalcemia causes ____ on EKG.
Hypercalcemia causes ____ on EKG.
Hypo: Prolonged QT interval
Hyper: Shortened QT interval
Tx of hypercalcemia
Avoid ___
1st line: Loop diuretics (Furosemide)
Severe: Calcitonin, Bisphosphonates
HCTZ–> caused increased Ca
Elevated calcium, low PTC indicates ___
Secondary HYPERPTH –> malignancy
All pts should be screened for ____ with ____ for ____ before treating hyperparathyroidism
Familial benign hypoclaciuric hypercalcemia
24 hr urine for Ca and Cr
DiGeorge Syndrome
Features (3)
Congential cause of hypocalcemia
Parathyroid hypoplasia
Thymic hypoplasia
Outflow tract defects of heart
Avoid ____ in hypocalcemia
Phenothiazine
Furosemide
Thyroid stimulating Ab
Graves dz (hyperthyroidism)
Abs in Hashimoto’s OR autoimmune thyroiditis
Antithyroid peroxidase Ab
Anti-Thyroglobulin Ab
Decreased radioactive iodine uptake
Thyroiditis
Diffuse radioactive iodine uptake
Grave’s Dz
Pituitary Adenoma
Low TSH, Low FT4
(rare) 2ry/3ry hypothyroidism
Usually pituitary
Drugs: dobutamine, octreotride, high-dose glucocorticoids
Riedel’s thyroiditis =
Presentation =
Tx =
Normal thyroid stroma replaced by fibrotic tissues
Painless fixed nodular that may grow rapidly
Steroids, tamoxifen, levothyroxine
Opthalmopathy w/ lid lag, exophthalmos/proptosis is exclusively seen in ___
Grave’s Dz
Pretibial myxedema =
Seen in__
nonpitting, edematous, pink-brown plaques/nodules on shins
Grave’s Dz
Methimazole and PropylThioUracil (PTU) used to tx ____
SE ____
Safe in pregnancy?
Grave dz, Toxic multinodular goiter (Plummer Dz)
SE: agranulocytosis, hepatitis –> monitor w/ CBC
PTU safe in pregnancy
Elevated TSH, High FT4
Presentation:
RAIU:
TSH secreting pituitary adenoma
Bitemporal hemianopsia
Diffuse uptake
MC therapy for Grave’s Dz and Plummer Dz
Radioactive Iodine
Antimicrosomial Ab seen in
Hashimoto’s Hypothyroidism
Post viral hypothyroidism =
Presentation =
Hallmark dx findings =
Tx =
De Quervain’s (Granulomatous)
PAINFUL neck/thyroid
Clinical HYPERthyroidism –> hypothyroid
Increased ESR
NO thyroid Ab
Tx: Aspirin, NO anti-thyroid meds
Medications that may induce HYPOthyroidism
Amiodarone*
Lithium*
Alpha interferon
MC cause of hypothyroidism in US =
MC cause of hypothyroidism worldwide =
Hashimoto’s
Iodine deficiency
Myxedema crisis =
MC in ___
Tx =
Extreme form of HYPOthyroidism
MC in elderly women w/ long standing hypothyroidism in cold weather
IV Levothyroxine
PASSIVE warming
Supportive
Best initial test to evaluate a thyroid nodule
Fine Needle Aspiration w/ Biopsy
MC type of benign thyroid nodule
Thyroid adenoma
MC type of thyroid carcinoma
Papillary
type of thyroid carcinoma MC associated w/ MEN2
Medullary
type of thyroid carcinoma MC after radiation exposure
MC in ___
Papillary
Young females
type of thyroid carcinoma MOST aggressive
MC in ___
Anaplastic
Males > 65 y/o
type of thyroid carcinoma w/ good prognosis
Papillary, Follicuar
type of thyroid carcinoma that commonly mets to local/cervical lymph nodes
Papillary
Early Medullary
type of thyroid carcinoma that commonly mets to distant areas via vascular invasion of lung, neck, brain, bone, liver, skin
Follicular
Late Medullary
____ used to monitor if residual dz present after tx or detect recurrence of MEDULLARY thyroid cancer.
Calcitonin levels
HYPERcalcemia stimulates ____
increased calcitonin secretion –> decreases blood Ca via decreased GI/kidney absorption and increased bone mineralization
Symptomatic tx of hyperthyroidism
beta blocker (propranolol)
IV methylprednisolone used to tx ___
Ophthalmopathy in hyperthyroidism
Ab that CAUSES hypothyroidism
Anti-TSH ab
Antiperoxidase, antithyroglobulin ab are disease markers
MC type of thyroid adenoma
Follicular