Endo 2 Flashcards
Subacute thyroiditis clinical features + RAI result
- precipitated by viral URI commonly
- tender or painful thyroid
- suppressed TSH (inflammation causes leakage of stored thyroid hormone)
- low RAI (due to leakage of stored thyroid hormone)
Graves clinical features + lab features
- pathognomic clinical features but some patients don’t have thyromegaly or extra thyroidal manifestations
- Elevated RAI uptake + elevated thyroglobulin
Pathognomic clinical features of Graves
- thyroid bruit
- eye disease
- dermopathy
Physical exam for toxic adenoma and multi nodular goiter
palpable thyroid nodules
Clinical features of subclinical Cushing syndrome
- cortisol greater than 5 from 1 mg overnight dexamethasone suppression test
- no specific features of Cushing syndrome
Normal plasma aldosterone-plasma renin ratio
Less than 20
Next step after determining patient has adrenal insufficiency
21-hydroxylase antibody (most common cause of primary adrenal insufficiency in the US is autoimmune adrenalitis)
What is secondary adrenal insufficiency?
- adrenal insufficiency due to hypopituitarism
Lab features of secondary adrenal insufficiency
- low serum cortisol + low or inappropriately normal serum ACTH levels
Management of a large, indeterminate adrenal mass
- Adrenalectomy (never biopsy, adrenocortical carcinoma can be missed due to sampling error)
Why patients with primary adrenal failure require both glucocorticoid and mineralocorticoid replacement
Destruction of adrenal cortex causes decreased synthesis of both cortisol and aldosterone
Why you monitor urinary calcium in chronic hypoparathyroidism
Without PTH, urinary calcium excretion is higher than normal for any given serum calcium level
Workup of suspected hypercalcemia from granulomatous disease (Sarcoidosis)
1,25-dihydroxyvitamin D level (macrophages convert 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D)
Lab profile hypercalcemia from granulomatous disease (Sarcoidosis)
- hypercalcemic
- suppressed PTH
Diagnosis of diabetes insipidus
- urine and serum osmolality
- NOT desmopressin challenge or water deprivation test
Treatment of toxic adenoma
Radioactive iodine
Goal A1c in older adults
7.5-8.0
Hypothalamic-pituitary-adrenal gland axis
CRH release from hypothalamus –> acts on pituitary to release ACTH –> ACTH acts on adrenal gland to release cortisol
Thyroid axis
TRH relapse from hypothalamus –> acts on pituitary to please TSH –> TSH acts on thyroid to release T3 and T4
Hypothalamic-pituitary-gonadal axis
GnRH from hypothalamus –> acts on anterior pituitary to release LH, FSH –> LH, FSH act on ovaries and testes to release testosterone and progesterone
RAI uptake in toxic adenoma
increased (it is hyperplasia of follicular cells)
Postpartum thyroiditis clinical features + lab features
Painless + within 1-6 months after delivery
- increased serum thyroglobulin + low RAI take
Mixed cryoglobulinemia disease associations
- chronic HCV, HIV
- SLE
Type 1 cryoglobulinemia disease associatoins
Lymphoproliferative or multiple myeloma
Mixed cryoglobulinemia clinical features
- fatigue, arthralgias
- glomerulonephritis, HTN
- pulmonary: dyspnea, pleurisy
- palpable purpura, LCV
Type 1 cryoglobulinemia clinical features
- often asymptomatic
- hyper viscosity (blurry visino), VTE
- livedo reticularis, purpura
Complement levels in Type 1 cryoglobulinemia
normal
Antiphospholipid antibody syndrome clinical features
- anemia, thrombocytopenia, livedo reticularis, glomerulonephritis
Next step in type 1 cryoglobulinemia
bone marrow biopsy
other lab presentation of primary hyperparathyroidism
- calcium can be normal or high-normal in setting of vitamin d deficiency (vitamin d deficiency and primary hyperparathyroidism often coexist)
- once vitamin D is repleted, patient becomes hypercalcemic + inappropriately elevated PTH level
Calcium, phos, PTH, vitamin d in secondary hyperparathyroidism from renal failure
- calcium = normal to low
- phos = normal to high
- 25 hydroxyvitamin D = normal
1,25 hydroxivitamin D = normal to low - PTH is high
Management of subclinical hypothyroidism
IF TSH greater than 10 –> treat with synthroid
IF TSH less than 10 –> obtain anti-thyroid peroxidase antibody + treat if meeting indication for treatment
Indications for treatment with subclinical hypothyroidism
- goiter
- symptomatic (**convincing symptoms not vague fatigue or constipation)
- pregnant
- ovulatory dysfunction with infertility
- **elevated anti-TPO titer
- hypercholesterolemia
Differential for hyperprolactinemia
1) **CKD (increased release and decreased clearance of prolactin)
2) meds (antipsychotics)
3) untreated primary hypothyroidism
4) pituitary adenomas
5) following a seizure
Meds causing hyperprolactinemia
- antipsychotics (haldol, risperdol)
- antidepressants (amitriptyline, sertraline)
- reglan
- opiates
Clinical features of adrenal insufficiency
- fatigue + hypotension + hypoglycemia + hyponatremia + high or NORMAL potassium
initial evaluation of clinically-suspected adrenal insufficiency
- 8 AM serum cortisol
- plasma ACTH
- ACTH stim test
Typical clinical course of subacute thyroiditis
hyperthyroidism then euthyroidism then hypothyroidism then recovery
Treatment of subacute thyroiditis
beta-blocker + NSAIDS
IF no improvement with NSAIDS, then prednisone
other term for subacute thyroiditis
Subacute granulomatous thyroiditis (de Quervains)