Endocrinology

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AppalachianDO  on September 8, 2010

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comlex 2

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Endocrinology

Hypothalamic Pituitary Axis
1. Prolactinoma
2. Acromegaly
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Hypothalamic Pituitary Axis 1. Prolactinoma
2. Acromegaly
Prolactinoma Si/Sx - HA, diplopia, CN3 palsy, impotence, amenorrhea, gynecomastia, galactorrhea, increase in androgens - virilization
50% caused by mass effect of the tumor
DX - MRI/CT
Tx - Bromocriptine
Acromegaly Pituitary adenoma secreting growth hormone
DX - increase in insulin-like growth factor 1 and/or CT/MRI
Tx- surgery or radiation to ablate enlarged pituitary, cotreotide for refractory tumor
DKA Treatment Primary - IV Fluids
Secondary - Insulin and K+
Tertiary - Add glucose to insulin drip if pt becomes normoglycemic
Adrenal Disorders 1. Cushing's Syndrome
2. Adrenal Insufficiency
3. Adrenal Cortical Hyperfunction
4. Adrenal Medulla
Cushing's Syndrome Usually iatrogenic or because of pituitary adenoma (cushing's dz)
Dx - 24 hour urine cortisol and high-dose dexamethasone suppression test
Tx - Excision of tumor with post operative steroids
Adrenal Insufficiency Primary - Addison's
Secondary - decreased ACTH production by pituitary

Hyponatremia, hyperkalemia
Primary Dx - hyperpigmentation, increased ACTH, decreased cortisol response to ACTH
Secondary Dx - Decreased ACTH, Increased cortisol response to ACTH
Tx - cortisol replacement
Adrenal Medulla/Pheochromocytoma Dx - increased urinary catechlamines, CT scan of adrenal gland
Tx - Surgical excision after alpha blocker
CCB for hypertensive crisis

Rule of 10: 10% malignant, 10% bilateral, 10% Extra-adrenal
Adrenal Cortical Hyperfunction Primary = Conn's Syndrome
HTN, Hypernatremia, Hypokalemia, alkalosis, decreased renin
Dx - Increased aldosterone, decreased renin, CT
Tx - Excision of adenoma, spironoloactone if bilateral hyperplasia, do not do bilater excision

Secondary - due to renal hypoperfusion
DX - increased renin
Male Gonadal Disorders 1. Klinefelters
2. XYY Syndrome
3. Testicular feminization Syndrome
4. 5-alpha-reductase deficiency
Klinefelter's Syndrome XXY
DX - buccal smear analysis for presence of Barr Bodies
Tx - testosterone supplements
XYY Syndrome Mild MR, Severe Acne, Increase incidence of violence and antisocial behavior
DX - karyotype analysis
Tx - none
Testicular Feminization Syndrome Female external genitalia with sterile, undescended testes
Increase in testosterone, LH, and estrogen
5-Alpha Reductase Deficiency Ambiguous genitalia until puberty
Testosterone and estrogen are normal
Dx - genetic testing
Tx - testosterone
Hypogonadal Disorders 1. Congenital Adrenal Hyperplasia
2. Prader-Willi Syndrome
3. laurence-Moon-Biedle syndrome
4. kallmann's syndrome
Congenital Adrenal Hyperplasia 21-Alpha hydroxylase deficiency (17-hydroxyprogesterone will be increased)
Salt loss
Tx - Hormone replacement
Prader-Willi Syndrome Paternal imprinting
Floppy baby with short limbs, obesity, classic almond-shaped eyes with strabismus
Dx - clinical or genetic analysis
Tx - none
Laurence-Moon-Biedle Syndrome Obese, normal craniofacies, MR, polydactyly
Dx - clinical or genetic analysis
Tx - None
Kallmann's Syndrome Anosmia (can't smell)
Decreased production of gonadotropin-releasing hormone by hypothalamus
DX - lack of circulating LH and FSH
Tx - pulsatile gonadotropin-releasing hormone - virilization
Thyroid Disorders 1. Hyperthyroid - Graves', Plummer's/Toxic multinodular goiter, Toxic Adenoma, thyroiditis,
2. Hypothyroid - Hashimoto's, Subacute/DeQuervain's
3. Thyroid Malignancy - Papillary, Medullary, Follicular, Anaplastic
Grave's Exopthalmos, pretibial myxedema
+TSH antibodies
Whole gland takes up radioactive iodine
Plummer's/Toxic Multinodular Goiter Radioactive uptake in nodules only
Toxic Adenoma One Nodule that has increased radioactive uptake
Rest of gland does not
Hashimoto's MC
+Antimicrosomal Ab
Lymphocytic infiltration
Subacute/DeQuervain's Transient Hyperthyroid
Viral inflammation with fever
Enlarged, TENDER thyroid
Hx of URI
Tx - NSAIDs
Papillary Thyroid CA Most common
Ground-glass Orphan annie nucleus and psammoma bodies
Tx - surgical excision
Medullary Thyroid CA Calcitonin secreting
Follicular Thyroid CA Blood-borne mets to bone and lungs
Anaplastic Thyroid CA Poorest prognosis of any CA - 0% at 5 years
MEN 1 3 P's
1. Pituitary/Prolactinom
2. Parathyroid
3. Pancreatoma
MEN 2 Pheo
Medullary Thyroid CA
Parathyroid hyperplasia or tumor
MEN 3 Pheo
Medullary Thyroid CA
Mucocutaneous Neuromas (GI Tract mostly)
Factitious Hypoglycemia Increased insulin level
Decreased C-peptide and proinsulin levels
Dawn Phenomenon Caused by growth hormone secretion in the morning
3 am glucose will reveal hyperglycemia
Tx - by increasing NPH
Somogy Effect Overtreated with NPH
3 am glucose will reveal hypoglycemia
Patients will be hypoglycemic in the morning

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