Endocrine Flashcards
Adrenal carcinoma epidemiology
RARE
40-50 YO
POOR prognosis - >50% present w/ mets to liver/lung
Clinical presentation adrenal carcinoma
HORMONE hypersecretion!!!
Women = hirsutism, temporal balding, inc muscle mass, amenorrhea
Men = gynecomastia, testicular atrophy, impotence, decreased libido
Boys = precocious puberty
PE adrenal carcinoma
Abdominal mass
Dx adrenal carcinoma
CXR - may be first indication if aneurysm is large enough - widened mediastinum
Echo: TTE (only able to visualize proximal ascending aorta)
MRI if pt cannot receive IV contrast for CTA
Treatment adrenal carcinoma
Surgical excision (gross tumor removal) Early disease - adrenalectomy & LN dissection Late disease (mets) - ipsilateral nephrectomy
Metastatic/unresectable: Systemic chemotherapy
Post-op adrenal carcinoma
Corticosteroid replacement after adrenalectomy!!!
Primary hyperparathyroidism etiology
Parathyroid adenoma (85%)
Secondary hyperparathyroidism etiology
CKD
Hypocalcemia
Clinical presentation hyperparathyroidism
Excess PTH = HYPERCALCEMIA / hypophosphatemia
= stones (kidney), bones (pain), groans (ABD pain), & moans (psych manifestations)
PE hyperparathyroidism
Decreased DTR
Dx hyperparathyroidism
Hypercalcemia
Increased PTH
Decreased phosphate
24 hour urine - increased calcium, vitamin D
Treatement hyperparthyroidism
Medical - Severe hypercalcemia (IVF, loop, bisphos, calcitonin) CKD patients (vit D/Ca2+ supplement if 2/2 CKD)
Surgical -
Parathyroideectomy ( >50 YO or w/ any sx)
Either 3.5 glands removed or all 4 with autotransplantation of PTH tissue into forearm
Etiology Hyperthyroidism
Graves, thyroiditis, toxic adenoma, goiter, TSH-secreting pituitary tumor
CP & PE hyperparathyroidism
Restlessness, fast speech, tremor, moist/warm skin, fine hair, menstrual irregularity, increased stools
Tachycardia, hyperreflexia, weight loss, lid lag, proptosis, exophthalmos, diaphoresis
Labs hyperparathyroidism
TSH (decreased)
T3/T4 (increased)
Anti-thyroid antibodies (TRAB, TSI)
Decreased cholesterol
Hypercalcemia
Treatment hyperparathyroidism
Medical -
Potassium iodide/ lugol solution
Thioamides: PTU, methimazole
Beta-blockers for sx relief
Radio-iodine ablation - PREFERRED over surgery
Surgical resection - for pregnant pts, or pt unable to take medications (levothyroxine)
Thyroid carcinoma epidemiology
2:1 FEMALE
Most are EUTHYROID
Incidence has increased two-fold in last decade
MC Type of thyroid carcinoma
Papillary (80%)
2/2 radiation exposure - YOUNG female - least aggressive thyroid CA, excellent prognosis, mets to cervical LN (distant mets uncommon)
Types of thyroid carcinoma
Papillary - MC (young female 2/2 rad, treatable w/ excellent prognosis)
Follicular - (40-60 YO 2/2 iodine deficiency - aggressive but slow, mets common, treatable w/ excellent prognosis)
Medullary - RF = hx MEN2 - from pararfollicular cells that secrete calcitonin - LN mets first, distant later - POOR prognosis - doesn’t take up iodine
Anaplastic - RF = years of radiation exposure, MALES > 65, MOST AGGRESSIVE FORM, rarest form - mets (trachea) local & distant - prognosis POOR
Papillary thyroid cancer characteristics
Papillary - MC thyroid cancer Young female 2/2 rad Treatable Excellent prognosis
Follicular thyroid cancer characteristics
Follicular -
40-60 YO 2/2 iodine deficiency
Aggressive but slow
Mets common but treatable w/ excellent prognosis)
Medullary thyroid characteristics
Medullary - RF = hx MEN2 From pararfollicular cells that secrete calcitonin LN mets first, distant later POOR prognosis - doesn't take up iodine
Anaplastic thyroid cancer characteristics
Anaplastic - RF = years of radiation exposure MALES > 65 MOST AGGRESSIVE FORM, rarest form Mets (trachea) local & distant Prognosis POOR
Treatment for papillary vs follicular vs medullary vs anaplastic
PAPILLARY & FOLLICULAR: * Total thyroidectomy * Subtotal thyroidectomy + radioiodine therapy * Monitor thyroglobulin levels 6mo for residual cells (give recombinant TSH, then check thyroglobulin) *
MEDULLARY * Total thyroidectomy w neck LN dissection * Calcitonin levels used to monitor *
ANAPLASTIC * Most cannot be surgically resected * External beam radiation * Chemotherapy * Palliative tracheostomy to maintain airway
Thyroid nodule RF
Extremities of age (very old, very young)
Hx head/neck radiation
10% are malignant
CP thyroid nodule
Mostly ASX
Compressive sx: difficulty swallowing/coughing, ear/jaw pain, hoarseness, (recurrent laryngeal nerve compression)
PE Benign thyroid nodule vs malignant
Benign: varied, smooth, sharp outlines, painless
Malignant: Rapid growth, fixed, no movement with swallowing
Thyroid function test results of most ppl w/ thyroid nodule
Euthyroid
Best initial test for person w/ thyroid nodule
FNA w/ Bx - ends up being benign nodule or follicular thyroid cancer 50-60% of the time
Most concerning radioactive iodine uptake results
NO uptake = cold nodule = highly suspicious for malignancy
Treatment for thyroid nodule
If cancer suspected - surgery
Observation w/ US for 6-12 mo if suspicious
Suppressive therapy with thyroid hormone to shrink nodule
Pheochromocytoma epi
Catecholamine-secreting tumor on adrenal gland - secretes epi/norepi INTERMITTENTLY
A/w with MEN II
90% benign, `10% malignant
CP pheochromocytoma
Hypertension - temporary or sustained - REFRACTORY TO MEDICATIONS = KEY
Palpitations
Headaches
Excessive sweating
Diagnosis of pheochromocytoma
24 hour urine catecholamine - metabolites (metanephrine, vanillymandelic acid)
MRI/CT to visualize the tumor
Labs will show hyperglycemia & hypokalemia
Treatment pheochromocytoma
complete adrenalectomy w/ pre-op nonselective alpha/beta blockade (prevent massive release during surgery) - w/ phenoxybenzamine, phentolamine x 7-14 days followed by beta blockade for HTN
Non-selective alpha/beta blockade before adrenalectomy for pheo
pre-op nonselective alpha/beta blockade (prevent massive release during surgery) -
w/ phenoxybenzamine, phentolamine x 7-14 days followed by beta blockade for HTN
Etiology palpitations
Cardiac - any arrhythmia, cardiac and extracardiac shunts, valvular heart disease (mitral valve prolapse, aortic or mitral insufficiency), pacemaker, cardiomyopathy
Psych - panic attack
Meds - sympathomimetic agents - anticholinergic drugs, beta blocker withdrawal
Habits - cocaine, meth, caffeine, nicotine
Metabolic disorders - hypoglycemia, thyrotoxicosis, pheo
High-output states - anemia, pregnancy, paget’s disease, fever
Catecholamine excess - exercise, stress, pheo
Four variables that are predictive of palpitations being cardiac
Male sex
Description of irregular heart beat
History of STRUCTURAL HEART DISEASE
Event duration > 5 min
None of patients w/ zero had cardiac etiology compared w/ 26, 48, and 71% of pt with 1, 2, and 3 predictors respectively
Cardiac causes of palpitations
Catecholamine excess 2/2 SANS stim 2/2 exercise/stress = nonsustained SVT & PVCs = palpitations
Autonomic dysfunction = inc vagal tone = PAF in men 3rd-6th decade of life
Idiopathic ventricular tachycardia during exercise or stopping of exercise in 2nd-3rd decade of life = palp, dizziness, syncope
Indications for radiofrequency ablation
If non-sustained SVT or ventricular ectopy (PVCs) (aka benign rhythms) –> reassure pt that rhythm is non-life-threatening - but if it’s incapacitating then initial tx = beta-blockade - anti-arrhythmic meds NOT recommended
Radiofrequency ablation of isolated ventricular ectopy is NOT recommended - unless person has fatigue & syncope on exertion or if ventricular ectopy has morphologic features & occurs incessantly
Dx evaluation of palpitations
Detailed history, physical exam, 12-lead EKG. Labs to rule out anemia & hyperthyroidism
Ambulatory monitoring if palp are bothersome or sx recurrent - two weeks of transelephonic monitoring - daily sx get 24 hour holter
Get electrophysiologic study if palpitations are sustained or poorly tolerated or if pt has high prestes liklihood of ersious arrhythmia (ie pt w/ structural heart disease)
Management of most sustained SVT or ventricular arrhythmias should be managed by cardiologist trained in paharmacologic invasive electrophysiologic management of arrhythmias