Introduction
Background
Takayasu arteritis is a granulomatous vasculitis of unknown etiology that commonly affects the thoracic and abdominal aorta. It causes intimal fibroproliferation of the aorta, great vessels, pulmonary arteries, and renal arteries and results in segmental stenosis, occlusion, dilatation, and aneurysmal formation in these vessels. Takayasu arteritis is the only form of aortitis that causes stenosis and occlusion of the aorta.1,2,3,4,5,6,7
Pathophysiology
The mechanism of Takayasu disease has not been fully elucidated to date. It begins during the patient's first 2 decades of life as a nonspecific, cell-mediated inflammatory process; as the disease progresses, fibrotic stenoses form on the aorta and its major branches.
Frequency
United States
Prevalence of Takayasu arteritis is 2.6-6.4 persons per 1,000,000 population. The wide variation is attributed to genetic factors and difficulties in making an accurate diagnosis.
International
Worldwide incidence is estimated to be 2.6 cases per 1,000,000 population/y.
Mortality/Morbidity
Mortality related to Takayasu arteritis is usually the result of vascular complications such as hypertension, stroke, and aortic insufficiency.
Race
Classic Takayasu arteritis is described in the Asian population; it is reported in all ethnic groups.
Sex
Takayasu arteritis most commonly occurs in female patients; the female-to-male ratio is 8:1.
Age
Ninety percent of patients with Takayasu arteritis are younger than 30 years.4,8,9
Presentation
Takayasu arteritis has early and late phases. The early phase is inflammatory and has been called the prepulseless phase; the late phase, called the pulseless phase, is characterized by occlusion. Patients may present with nonspecific signs and symptoms such as fever, arthralgias, and weight loss.
During the acute inflammatory stage, Takayasu disease causes a low-grade fever, tachycardia, and pain adjacent to the inflamed arteries (eg, carotodynia)10 ; in addition, 50% of patients experience fatigability. Carotid and clavicular bruits, asymmetric upper-extremity blood pressures, hypertension, diminished or absent upper-extremity pulses, and ischemic symptoms may suggest the diagnosis. A 5- to 20-year interval may separate the acute inflammatory stage and the symptomatic arterial occlusive stage. Neurologic symptoms are present in 80% of patients with Takayasu disease that involves the brachiocephalic arteries.
Four types of late-phase Takayasu arteritis have been described on the basis of the sites of involvement; those types are as follows:
- Type I — Classic pulseless type that involves the brachiocephalic trunk, carotid arteries, and subclavian arteries
- Type II — Combination of types I and III
- Type III — Atypical coarctation type that involves the thoracic and abdominal aortas distal to the arch and its major branches
- Type IV — Dilated type that involves extensive dilatation of the length of the aorta and its major branches
The most common type is type III, which is found in as many as 65% of patients. The most commonly involved vessels include the left subclavian artery (50%), the left common carotid artery (20%), the brachiocephalic trunk, the renal arteries, the celiac trunk, the superior mesenteric artery, and the pulmonary arteries (50%). Infrequently, the axillary, brachial, vertebral, coronary, and iliac arteries are involved.
Preferred Examination
Historically, angiography has been the criterion-standard imaging tool for the diagnosis and evaluation of Takayasu arteritis. In the past 5 years, computed tomography angiography (CTA) and magnetic resonance angiography (MRA) have become equally valuable tools. Their large fields of view, as well as the fact that they are noninvasive and that intravenously administered contrast material is used, rather than intra-arterially administered contrast material, make them far more attractive as diagnostic tools. The increasing resolution of multidetector-row CT arrays increases its diagnostic value. The soft tissue differentiation possible with MR techniques is valuable in distinguishing active forms of Takayasu disease from quiescent forms.11,12,13,14
Differential Diagnoses
Other Problems to Be Considered
Atherosclerosis: Atherosclerosis usually occurs in persons older than 40 years. It is more common in men than in women. It has a predilection for the origin of vessels and bifurcations in the neck
Fibromuscular dysplasia (FMD): Classic FMD has a beaded appearance. It usually does not affect the aorta, as evidenced on angiograms. FMD is rare in the subclavian artery.
Temporal arteritis: This disease usually does not involve the common carotid arteries.
Syphilitic aortitis: Classically, syphilitic aortitis causes calcification in the ascending aorta.
Neurofibromatosis type I, Williams syndrome, rubella, and radiation therapy may cause middle aortic syndrome; their manifestations may mimic Takayasu disease in this region.
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References
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Further Reading
Keywords
Takayasu arteritis, Takayasu's arteritis, Takayasu disease, Takayasu's disease, nonspecific aortoarteritis, pulseless disease, aortic arch syndrome, granulomatous vasculitis, aortic inflammation
Overview: Arteritis, Takayasu