She needs corticosteroid medicine, started promptly. Giant cell arteritis, also called temporal arteritis, inflames medium-sized arteries. Some of those arteries feed the eye and the optic nerve. When the blood supply drops, the nerve is damaged and vision is lost. That is called ischemic optic neuropathy. Prompt corticosteroid therapy is given to prevent blindness or death, and treating the body-wide disease also helps the eye. The second eye is at real risk, which is why treatment cannot wait for the next routine visit.
Know the pattern behind the diagnosis. This disease mainly affects people over age 60. It counts as a vascular disease because it narrows arteries, and also as an inflammatory or immune disorder. Eye signs and symptoms are often the first clue the doctor gets. Vision loss can also come from blockage of the central retinal artery, and the eye muscles may become imbalanced, giving double vision. Confirmation needs urgent blood testing and a temporal artery biopsy, which means removing a small piece of the artery for testing. None of that changes the first move. Steroid treatment is started quickly. Treat any older patient who reports sudden, painless vision loss in one eye as an emergency and get the doctor right away. Do not schedule that patient for a routine visit next week.
Hold on to one rule: giant cell arteritis in an older adult means steroids now, not next week. Linking a body-wide disease to its eye damage is the heart of the COA content area on general medical knowledge.
Incorrect Answers
- A. This is an inflammatory disease, not an infection. Antibiotics do not calm inflamed artery walls.
- B. Retinal laser treats problems such as diabetic retinopathy. It cannot restore a damaged optic nerve.
- D. Pressure-lowering drops are for glaucoma. This patient's problem is blood supply, not eye pressure.
Testing Pearls
- Giant cell arteritis is also called temporal arteritis and mostly hits people over 60.
- It can cause ischemic optic neuropathy or central retinal artery blockage.
- Workup is urgent blood tests plus temporal artery biopsy.
- Treatment is corticosteroids, given fast to save sight and life.
- Sudden painless vision loss in one eye is an emergency; tell the doctor at once.
References
- American Academy of Ophthalmology. Ophthalmic Medical Assisting: An Independent Study Course. Chapter 4, Systemic Diseases and Ocular Manifestations.
