A Sore Scalp, an Aching Jaw and a Shadow Over One Eye: The Inflammatory Pathophysiology of Giant Cell Arteritis in a 74-Year-Old Woman and Why Treatment Starts Before the Biopsy
[Student Name]
University of Phoenix
NRP/511: Advanced Pathophysiology
Week 2 Assignment
[Instructor Name]
[Date]
The patient is a composite written for a model paper.
Mrs. A., a 74-year-old retired schoolteacher, comes to our clinic with three weeks of a new headache over her right temple, tenderness when she brushes her hair and aching in her jaw when she chews. Yesterday, for about five minutes, a gray curtain fell over the vision in her right eye and then lifted. She has felt tired and has lost 3 kg. Her erythrocyte sedimentation rate is 78 mm/hr and her C-reactive protein 46 mg/L. This paper explains the inflammation behind her symptoms and why I start treatment today.
An Immune Disease of Aging Arteries
Giant cell arteritis affects people over 50, with incidence rising with age. Weyand and Goronzy (2014) describe it as a granulomatous vasculitis in which the immune system attacks the walls of large and medium arteries, particularly the aorta and the branches of the external and internal carotid arteries. Aging of both the immune system and the vessel wall appears to set the stage.
How the Inflammation Begins
The medium and large arteries contain dendritic cells in their outer layer, the adventitia, which normally help maintain immune tolerance. In giant cell arteritis, these dendritic cells become activated, possibly by an unknown trigger, and recruit CD4 T cells into the vessel wall (Weyand & Goronzy, 2014). The T cells differentiate into types that produce interferon-gamma and interleukin-17, which activate macrophages. Macrophages fuse into multinucleated giant cells, which give the disease its name, and form granulomas in the vessel wall.
How the Artery Narrows
Activated macrophages in the media, the muscular middle layer, release enzymes and reactive oxygen species that damage the elastic lamina. Other macrophages produce growth factors such as platelet-derived growth factor and vascular endothelial growth factor, which drive smooth muscle cells to migrate inward and proliferate, thickening the intima (Weyand & Goronzy, 2014). The result is a vessel whose lumen narrows or closes, starving the tissue it supplies of blood. The immune system is not attacking the eye or the jaw; it is attacking the pipes that feed them, and the symptoms appear wherever a pipe narrows.
Symptom by Symptom
Headache and scalp tenderness arise from inflammation of the superficial temporal artery and its branches, which lie just under the scalp. On examination, Mrs. A.'s right temporal artery is thickened, tender and has a reduced pulse.
Jaw claudication, pain on chewing that eases with rest, reflects narrowing of the maxillary artery, a branch of the external carotid, so the chewing muscles become ischemic when their demand rises. It is one of the more specific symptoms of the disease.
Transient vision loss is the most dangerous symptom. The ophthalmic artery and its branches, including the posterior ciliary arteries that feed the optic nerve head, arise from the internal carotid. When they narrow, the optic nerve becomes ischemic. A transient episode can precede permanent loss, often within days.
Fatigue, weight loss and sometimes fever reflect systemic inflammation, driven largely by interleukin-6 released from the inflamed vessels (Weyand & Goronzy, 2014).
What the Laboratory Values Reflect
Interleukin-6 stimulates the liver to produce acute phase proteins, including C-reactive protein and fibrinogen, which raise the erythrocyte sedimentation rate. Mrs. A.'s high values reflect this cytokine-driven response. Mild anemia and a raised platelet count are also common for the same reason.
Related Disease: Polymyalgia Rheumatica
Many patients with giant cell arteritis also have polymyalgia rheumatica, with aching and stiffness of the shoulders and hips. Weyand and Goronzy (2014) describe the two as related conditions on a spectrum of the same immune process. Mrs. A. denies shoulder or hip stiffness, but I will ask again at follow-up.
Why Treatment Starts Today
Because the vision symptom signals ischemia of the optic nerve, delay risks permanent blindness. The American College of Rheumatology and Vasculitis Foundation guideline recommends high-dose oral glucocorticoids for newly diagnosed giant cell arteritis without threatened vision loss and considers intravenous pulse glucocorticoids for patients with threatened vision loss, along with temporal artery biopsy to confirm the diagnosis (Maz et al., 2021). Steroids should not wait for the biopsy; the histological changes remain visible for days to weeks after treatment begins. I call the on-call rheumatologist and ophthalmologist, and Mrs. A. is sent to the emergency department for same-day evaluation and intravenous steroids given her visual symptom.
How Steroids Work Here
Glucocorticoids suppress the transcription of many cytokines, including interleukin-6, and reduce T cell and macrophage activation, quickly lowering systemic inflammation and protecting the vessel. Weyand and Goronzy (2014) note, however, that some immune activity in the vessel wall may persist despite treatment, which may explain relapses.
Sparing Steroids
Long courses of glucocorticoids cause serious harm in older adults, including diabetes, osteoporosis, infection and cataracts. Because interleukin-6 is central to the disease, blocking its receptor is a logical therapy. In a randomized trial, tocilizumab with a 26-week prednisone taper produced sustained remission at 52 weeks in 56% of patients treated weekly and 53% of those treated every other week, compared with 14% and 18% in the placebo groups, with lower cumulative prednisone doses (Stone et al., 2017). This option will be discussed with her rheumatologist.
The Biopsy and What It Shows
Temporal artery biopsy remains the standard for confirming the diagnosis. A positive specimen shows inflammatory cells, often with giant cells, clustered near the internal elastic lamina, which is fragmented. Because inflammation can skip segments of the artery, a short specimen can miss it, and a negative biopsy does not rule out the disease when suspicion is high. Ultrasound of the temporal arteries, which can show a dark halo of wall swelling, is an alternative used in some centers.
Large-Vessel Involvement
The same immune process can affect the aorta and its major branches. Over years, inflammation of the aortic wall can weaken it and lead to aneurysm, which is why some patients are monitored with imaging long after the headache resolves. Arm claudication or unequal blood pressures between the arms would suggest involvement of the subclavian arteries (Weyand & Goronzy, 2014).
Protecting Her During Treatment
While on glucocorticoids, Mrs. A. will need calcium and vitamin D, assessment of bone density and consideration of bone-protective therapy, glucose monitoring and vaccinations updated before immune suppression deepens, as appropriate.
Follow-Up
I will see Mrs. A. within a week of her discharge to review symptoms, blood pressure, glucose and mood, all of which steroids can affect.
Conclusion
Giant cell arteritis is an immune attack on the walls of aging large arteries, begun by activated dendritic cells and T cells and carried out by macrophages and giant cells that damage the vessel and drive it to narrow. Mrs. A.'s headache, scalp tenderness, jaw claudication and transient vision loss each follow from a specific inflamed branch, and her laboratory values reflect interleukin-6. The threat to her vision makes treatment urgent, and the central role of interleukin-6 explains both her symptoms and a therapy that can spare her from long steroid courses.
References
Maz, M., Chung, S. A., Abril, A., Langford, C. A., Gorelik, M., Guyatt, G., Archer, A. M., Conn, D. L., Full, K. A., Grayson, P. C., Ibarra, M. F., Imundo, L. F., Kim, S., Merkel, P. A., Rhee, R. L., Seo, P., Stone, J. H., Sule, S., Sundel, R. P., . . . Mustafa, R. A. (2021). 2021 American College of Rheumatology/Vasculitis Foundation guideline for the management of giant cell arteritis and Takayasu arteritis. Arthritis & Rheumatology, 73(8), 1349-1365. https://doi.org/10.1002/art.41774
Stone, J. H., Tuckwell, K., Dimonaco, S., Klearman, M., Aringer, M., Blockmans, D., Brouwer, E., Cid, M. C., Dasgupta, B., Rech, J., Salvarani, C., Schett, G., Schulze-Koops, H., Spiera, R., Unizony, S. H., & Collinson, N. (2017). Trial of tocilizumab in giant-cell arteritis. New England Journal of Medicine, 377(4), 317-328. https://doi.org/10.1056/NEJMoa1613849
Weyand, C. M., & Goronzy, J. J. (2014). Giant-cell arteritis and polymyalgia rheumatica. New England Journal of Medicine, 371(1), 50-57. https://doi.org/10.1056/NEJMcp1214825
How this NRP 511 Week 2 example is structured
The NRP/511 Week 2 work usually asks students to explain inflammation and immune mechanisms through a case. This paper follows the immune response from its trigger to the damaged artery, ties each clinical finding to a vessel and a mechanism and shows how the mechanism dictates the urgency of treatment. Students search this week as NRP 511 Week 2, NRP511 Wk 2 or NRP/511 Wk 2; all three are the same assignment.
NRP/511 Week 2 questions, answered
What does NRP/511 Week 2 usually ask for?
Many sections ask students to explain inflammation, immune responses or genetic influences on disease, often through a case study.
What is giant cell arteritis?
An inflammatory disease of large and medium arteries, mainly the aorta and branches of the carotid arteries, in adults over 50, in which immune cells infiltrate the vessel wall and can narrow or block it.
Why is giant cell arteritis an emergency?
Inflammation of arteries supplying the optic nerve can cause sudden, permanent blindness, so high-dose glucocorticoids are started as soon as the diagnosis is suspected, before biopsy results.
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