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Prepulseless Phase
Takayasu arteritis, also referred to as pulseless disease and aortic arch syndrome, is a rare chronic inflammatory vasculitis that primarily affects large- and medium-sized vessels. Cutaneous involvement can occur when inflammation of the cutaneous vasculature occurs and may present as erythema multiforme, erythema nodosum, erythema induratum, pyoderma gangrenosum, ulcerated subacute nodular lesions, papulonecrotic eruptions, and papular erythematous lesions of the hands.
No definitive cause of Takayasu arteritis has been identified, but it is thought to be an immunoglobulin G (IgG)-mediated autoimmune vasculitis, perhaps triggered by a cross-reacting infectious agent.
The disease typically presents in the second and third decade of life in females (10:1) of Asian descent. It is most prevalent in Japan, Southeast Asia, India, and Mexico but has been found worldwide and in both sexes. Incidence is approximately 2.5 per million.
The disease has 2 phases that may overlap: a "pre-pulseless" and a pulseless phase. In the first phase, a constellation of nonspecific constitutional symptoms and signs including fever, night sweats, malaise, weight loss, arthralgia, myalgia, and mild anemia may be seen. In the second phase, the characteristic sequelae of large-vessel stenosis occur: upper extremity claudication, diminished brachial pulses, and/or differences in blood pressure between contralateral or ipsilateral extremities.
For diagnosis, the American College of Rheumatology requires 3 of 6 criteria:
Age at disease onset is 40 years or younger
Claudication of extremities
Decreased brachial artery pulse
Blood pressure difference of > 10 mm Hg between arms
Bruit over subclavian artery or aorta
Arteriogram abnormality
Although subclavian vessels are most commonly affected, other branches may be involved: carotid stenosis may cause headache, dizziness, amaurosis, or syncope; renal artery involvement frequently causes hypertension; and proximal dilatation of the aorta can cause aortic regurgitation, dilated cardiomyopathy, and congestive heart failure. Additional associated symptoms may include Raynaud phenomenon, dyspnea, chest pain, and myocardial ischemia.
Diagnosis during the pre-pulseless phase is difficult because of the nonspecific nature of symptoms and laboratory abnormalities. Diagnosis is usually made during the pulseless phase when clinical criteria, as per above, are met. Angiography is essential to confirm diagnosis.
Constitutional symptoms are typically intermittent, and vascular complications are generally progressive, but the prognosis is generally good, with 5-year survival reports of 90%-94%.
Pediatric patient considerations: Takayasu arteritis in children rarely presents with pulselessness, claudication, or bruits. It is most frequently identified during evaluation for hypertension, heart failure, and neurologic symptoms.
Codes
ICD10CM: M31.4 – Aortic arch syndrome [Takayasu]
SNOMEDCT: 359789008 – Takayasu's disease
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Diagnostic Pearls
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Differential Diagnosis & Pitfalls
Autoimmune:
Giant cell arteritis – typically seen in older patients (mean age 72), rarely causes hypertension, claudication, or bruits; ocular involvement is common
Sarcoidosis – look for perihilar lymphadenopathy and pulmonary granulomas
Mycotic aneurism – rule out sepsis or endocarditis with blood culture
Tuberculosis – check purified protein derivative (PPD) status
Tertiary syphilis – check for fluorescent treponemal antibody (about one-fourth of rapid plasma reagin [RPR] is false negative in tertiary syphilis)
Leprosy – look for hypopigmented or erythematous macules with loss of sensation, thickened peripheral nerves, and acid-fast bacilli on skin smear or biopsy
Congenital / genetic:
Congenital malformation – aortic coarctation or middle aortic syndrome; unlikely to have constitutional symptoms
Marfan syndrome – look for arachnodactyly, pectus excavatum or carinatum, and arm span greater than height; family history
Neurofibromatosis – look for neurofibromas, café au lait spots, ocular Lisch nodules; family history (autosomal dominant)
Pitfalls: On average, it takes 44 months from onset of symptoms to diagnose Takayasu arteritis. Because of its rarity and the often subtle physical findings, Takayasu arteritis frequently fails to enter the differential diagnosis for patients with fever of unknown origin (FUO). Thus, it is critical to consider Takayasu arteritis in patients younger than 40 years with FUO, aortic regurgitation, hypertension, or absent pulses. Rarely, patients older than 40 years meet the criteria for Takayasu arteritis because of a prolonged prediagnostic period or late onset of symptoms. In this case, giant cell arteritis may be indistinguishable from Takayasu arteritis; however, initial treatment for both is nearly identical.