Giant-cell arteritis

Giant-cell arteritis

The arteries of the face and scalp.
Classification and external resources
Specialty rheumatology
ICD-10 M31.5-M31.6
ICD-9-CM 446.5
OMIM 187360
DiseasesDB 12938
MedlinePlus 000448
eMedicine neuro/592
Patient UK Giant-cell arteritis
MeSH D013700

Giant-cell arteritis (GCA or temporal arteritis or cranial arteritis) or Horton disease is an inflammatory disease of blood vessels most commonly involving large and medium arteries of the head, predominantly the branches of the external carotid artery. The most serious complication is occlusion of the ophthalmic artery, which is a branch of the internal carotid. It can create a medical emergency which can cause irreversible ischemia and blindness if not treated promptly. GCA is treated with glucocorticoids (steroids), which reduce the inflammation and prevent occlusion. No other drugs are effective or contribute to the effect of glucocorticoids.[1]

GCA is a form of vasculitis. It typically causes inflammation of the network of small vessels (vasa vasorum) that supplies the larger arteries. GCA affects arteries of the head and neck, including the three arteries that branch out from the arch of the ascending aorta, and their branches—the thoracic aorta, the axillary arteries, the vertebral arteries, and further on in the head in the ophthalmic and external carotid arteries (the temporal and occipital arteries). It can cause occlusion of the arteries and ischemia.[1]

GCA is diagnosed with biopsy of the temporal artery. While the clinical presentation, patient characteristics and blood test markers of inflammation can raise suspicion, only a temporal artery biopsy can give definite diagnosis. Some cases may not involve the temporal artery, and distinguishing between a false negative and the absence of GCA is difficult.[1]

The terms "giant-cell arteritis" and "temporal arteritis" are sometimes used interchangeably, because of the frequent involvement of the temporal artery. However, it can involve other large vessels (such as the aorta in "giant-cell aortitis"[2]). Giant-cell arteritis of the temporal artery is referred to as "temporal arteritis," and is also known as "cranial arteritis" and "Horton's disease."[3]:840 The name (giant-cell arteritis) reflects the type of inflammatory cell involved[4] as seen on a biopsy.

Signs and symptoms

It is more common in women than in men by a ratio of 2:1 and more common in those of Northern European descent, as well as those residing at higher latitudes. The mean age of onset is >55 years, and it is rare in those less than 55 years of age.

People present with:

The inflammation may affect blood supply to the eye and blurred vision or sudden blindness may occur. In 76% of cases involving the eye, the ophthalmic artery is involved causing arteritic anterior ischemic optic neuropathy.[9] It is important to be aware that giant-cell arteritis may present with atypical or overlapping features.[10] Early and accurate diagnosis is important to prevent ischemic vision loss and therefore, this condition is considered a medical emergency.[10]

Associated conditions

The Varicella-zoster virus antigen was found in 74% of temporal artery biopsies that were GCA-positive, suggesting that the VZV infection may trigger the inflammatory cascade.[11]

The disorder may coexist (in a half of cases)[8] with polymyalgia rheumatica (PMR), which is characterized by sudden onset of pain and stiffness in muscles (pelvis, shoulder) of the body and is seen in the elderly. GCA and PMR are so closely linked that they are often considered to be different manifestations of the same disease process. Other diseases associated with temporal arteritis are systemic lupus erythematosus, rheumatoid arthritis, and severe infections.

Giant-cell arteritis can involve branches of the aorta as well, leading to aortic aneurysm or dissection. For this reason, patients should be followed with serial chest X-rays.

Diagnosis

Physical exam

Laboratory tests

Biopsy

Histopathology of giant cell vasculitis in a cerebral artery. Elastica-stain.

The gold standard for diagnosing temporal arteritis is biopsy, which involves removing a small part of the vessel and examining it microscopically for giant cells infiltrating the tissue. Since the blood vessels are involved in a patchy pattern, there may be unaffected areas on the vessel and the biopsy might have been taken from these parts. Unilateral biopsy of a 1.5–3 cm length is 85-90% sensitive (1 cm is the minimum).[12] A negative result does not definitively rule out the diagnosis. Thus, currently biopsy is only considered confirmatory for the clinical diagnosis, or one of the diagnostic criteria.[7]

Imaging studies

Radiological examination of the temporal artery with ultrasound yields a halo sign. Contrast enhanced brain MRI and CT is generally negative in this disorder. Recent studies have shown that 3T MRI using super high resolution imaging and contrast injection can non-invasively diagnose this disorder with high specificity and sensitivity.[13]

Mechanism

The pathological mechanism seems to start when dendritic cells in the vessel wall recruit T cells and macrophages to form granulomatous infiltrates. T helper 17 cells involved with interleukin (IL) 6, IL-17 and IL-21 play a critical part; this pathway is suppressed with glucocorticoids.[1]

Treatment

Corticosteroids, typically high-dose prednisone (1 mg/kg/day), must be started as soon as the diagnosis is suspected (even before the diagnosis is confirmed by biopsy) to prevent irreversible blindness secondary to ophthalmic artery occlusion. Steroids do not prevent the diagnosis from later being confirmed by biopsy, although certain changes in the histology may be observed towards the end of the first week of treatment and are more difficult to identify after a couple of months.[14] The dose of prednisone is lowered after 2–4 weeks, and slowly tapered over 9–12 months. Tapering may require two or more years. Oral steroids are at least as effective as intravenous steroids,[15] except in the treatment of acute visual loss where intravenous steroids appear to offer significant benefit over oral steroids.[16] It is unclear if adding a small amount of aspirin is beneficial or not as it has not been studied.[17]

References

  1. 1 2 3 4 Weyand CM and Goronzy JJ (July 3, 2014). "Giant-Cell Arteritis and Polymyalgia Rheumatica". N Engl J Med 371 (1): 50–57. doi:10.1056/NEJMcp1214825.
  2. ↑ Walter MA, Melzer RA, Graf M, Tyndall A, Müller-Brand J, Nitzsche EU (May 2005). "[18F]FDG-PET of giant-cell aortitis". Rheumatology (Oxford) 44 (5): 690–1. doi:10.1093/rheumatology/keh551. PMID 15728420.
  3. ↑ James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0.
  4. ↑ "giant cell arteritis" at Dorland's Medical Dictionary
  5. ↑ Moutray TN, Williams MA, Best JL (August 2008). "Suspected giant cell arteritis: a study of referrals for temporal artery biopsy" (PDF). Can. J. Ophthalmol. 43 (4): 445–8. doi:10.1139/i08-070. PMID 18711459.
  6. ↑ Sainuddin S, Saeed NR (December 2008). "Acute bilateral tongue necrosis – a case report". Br J Oral Maxillofac Surg 46 (8): 671–2. doi:10.1016/j.bjoms.2008.03.027. PMID 18499311.
  7. 1 2 Zadik Y, Findler M, Maly A, et al. (January 2011). "A 78-year-old woman with bilateral tongue necrosis". Oral Surg Oral Med Oral Pathol Oral Radiol Endod 111 (1): 15–9. doi:10.1016/j.tripleo.2010.09.001. PMID 21176820.
  8. 1 2 Hunder, Gene G. "Polymyalgia rheumatica and giant cell (temporal) arteritis". uptodate.com. Wolters Kluwer. Retrieved 23 September 2015.
  9. ↑ Hayreh (April 3, 2003). "Ocular Manifestations of GCA". University of Iowa Health Care. Retrieved 2007-10-15.
  10. 1 2 Rana AQ, Saeed U, Khan OA, Qureshi A, Paul D (Oct 2014). "Giant cell arteritis or tension-type headache?: A differential diagnostic dilemma". J Neurosci Rural Pract 5 (4): 409–411. doi:10.4103/0976-3147.140005. PMC 4173245. PMID 25288850.
  11. ↑ Gilden, Don; White, Teresa; Khmeleva, Nelly; Heintzman, Anna; Choe, Alexander; Boyer, Philip J.; Grose, Charles; Carpenter, John E.; Rempel, April (2015-05-12). "Prevalence and distribution of VZV in temporal arteries of patients with giant cell arteritis". Neurology 84 (19): 1948–1955. doi:10.1212/WNL.0000000000001409. ISSN 0028-3878. PMC 4433460. PMID 25695965.
  12. ↑ Ypsilantis E, et al. (November 2011). "Importance of specimen length during temporal artery biopsy". Br J Surg 98 (11): 1556–1560. doi:10.1002/bjs.7595. PMID 21706476.
  13. ↑ Bley TA, Uhl M, Carew J, et al. (October 2007). "Diagnostic value of high-resolution MR imaging in giant cell arteritis". AJNR Am J Neuroradiol 28 (9): 1722–7. doi:10.3174/ajnr.A0638. PMID 17885247.
  14. ↑ Font RL, Prabhakaran VC (2007). "Histological parameters helpful in recognising steroid-treated temporal arteritis: an analysis of 35 cases". The British journal of ophthalmology 91 (2): 204–9. doi:10.1136/bjo.2006.101725. PMC 1857614. PMID 16987903.
  15. ↑ "BestBets: Steroids and Temporal Arteritis".
  16. ↑ Chan CC, Paine M, O'Day J (September 2001). "Steroid management in giant cell arteritis". Br J Ophthalmol 85 (9): 1061–4. doi:10.1136/bjo.85.9.1061. PMC 1724128. PMID 11520757.
  17. ↑ Mollan, SP; Sharrack, N; Burdon, MA; Denniston, AK (Aug 3, 2014). "Aspirin as adjunctive treatment for giant cell arteritis.". The Cochrane database of systematic reviews 8: CD010453. doi:10.1002/14651858.CD010453.pub2. PMID 25087045.

External links

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