questions 6

Graves' Disease

Topic updated on 12/17/16 7:14am

  • A 34-year-old woman presents to the physician's office with complaints of weight loss and sweatiness.  She states that despite a ravenous appetite, she has lost 4 pounds this past month.  In addition she states that she has been more sweaty lately, and unable to cool down in rooms that others find comfortable.  On physical exam you see an anxious and fidgety woman who has a very prominent gaze with protuberant eyes.
  • An autoimmune disease with stimulating anti-TSH receptor antibodies
    • a type II hypersensitivity
    • anti-microsomal and anti-thyroglobulin antibodies also present (more commonly associated with Hashimoto's thyroiditis and hypothyroidism)
    • anti-TSH antibodies also stimulate retroorbital fibroblasts  exopthalmos
  • Epidemiology
    • most common cause of hyperthyroidism
    • female dominant
      • HLA-B8, -DR3 association
    • often incited during stress
      • e.g., childbirth, infection, and steroid withdrawal
  • Symptoms
    • hyperthyroidism
  • Physical exam
    • symmetrical, non-tender thyroid enlargement
    • ophthalmopathy (proptosis and exopthalmos)
      • due to glycosaminoglycan deposition
    • pretibial myxedema
    • digital swelling
  • Serology 
    • ↑ total serum T4
    • ↑ free T4
    • 123I uptake diffusely on radioactive iodine uptake scan
    • ↓ serum TSH
  • Pharmacologic
    • β-blockers
    • thiocyanate
      • inhibits the Na-I symporter located on the basolateral membrane of thyroid epithelial cells
        • decreased iodide uptake leads to decreased hormone synthesis
    • thionamides
      • result in reduced hormone synthesis
    • 131I ablation
    • glucocorticoids
      • treatment of exophthalmos
Prognosis, Prevention, and Comlications
  • Complications
    • stress-induced catecholamine surge
      • may be fatal by arrhythmia
    • pregnancy complications
      • anti-TSH receptor antibodies may cross placenta and produce hyperthryoidism in the fetus
High Yield
  • Presentation
    • a female patient with weight loss, tachycardia, irritability, pretibial myxedema and exopthalmos
  • Pathophysiology
    • TSH stimulating antibodies stimulate TSH receptors (hyperthyroidism) and retro-orbital fibroblasts (exophthalmos)
      • associated with other autoimmune disorders and HLA B8 and DR3
    • stimulation of thyroid gland leads to
      • increased T4 and T3
      • decreased TSH
      • diffuse increase in radioactive iodine uptake
  • Management
    • best initial step: propranolol and propylthiouracil
      • be aware of agranulocytosis with thionamides
    • definitive management: radioactive iodine ablation (in general) or surgical removal of the thyroid in extreme cases (pregnancy)


Qbank (5 Questions)

(M1.EC.16) A 47-year-old Hispanic male presents with complaints of recent heat intolerance and rapid heart rate. The patient has also experienced unintentional weight loss noting a loss of 15 pounds. Physical exam reveals tachycardia and skin that is warm to the touch. A radioactive iodine uptake scan of the thyroid reveals several focal nodules of increased iodine uptake. The physician orders a serum analysis that will most likely show which of the following? Topic Review Topic

1. High TSH and low T4
2. Low TSH and high T4
3. High TSH and normal T4
4. High TSH and high T4
5. Low TSH and low T4

(M1.EC.26) A patient suffering from Graves' disease is given thiocyanate by his physician. Thiocyanate helps in the treatment of Graves' disease by: Topic Review Topic

1. Inhibiting thyroid peroxidase
2. Inhibiting 5'-iodinase
3. Inhibiting thyroid deiodinase
4. Inhibiting beta-adrenergic receptors
5. Inhibiting iodide follicular uptake

(M1.EC.35) A 26-year-old African-American female presents to the hospital for a routine check-up. Review of systems reveals that she often feels nervous and has recently developed a slight tremor. Of note, she has lost fifteen pounds in the past 3 months, despite an increased appetite. On physical exam, her skin is warm and she has mild exophthalmos. Which of the following findings would be most consistent with the patient's presentation? Topic Review Topic

1. Anti-thyroglobulin antibodies
2. Anti-thyroid peroxidase antibodies
3. Decreased levels of T4/T3
4. Lymphocytic infiltration
5. Anti-myelin antibodies

(M1.EC.62) A 25-year-old Hispanic male presents with heat intolerance and recent weight loss. Serum analysis shows increased levels of T4 and T3, as well as the presence of thyroglobulin-stimulating immunoglobulins. The patient is found to be tachycardic and has marked edema and waxy discoloration in his legs. Which of the following would be consistent with this patient's disease? Topic Review Topic

1. Sympathetic underactivity
2. Anti-thryroglobin antibodies
3. Exophthalmos
4. Increased TSH release
5. Multinucleate giant cells present in the thyroid

(M1.EC.109) A 25-year old Caucasian female presents with symptoms of Graves' disease. Her doctor prescribes medications and sends the patient home. After two months of therapy, the patient returns upset that her exophthalmos has not gone away. Which of the following drugs should the physician have prescribed to treat the exophthalmos? Topic Review Topic

1. Propanolol
2. Metropolol
3. PTU
4. Corticosteroids
5. No treatment as this will resolve naturally


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