1990 Criteria for the Classification of Takayasu Arteritis
1. Age at disease onset < 40 years
Development of symptoms
or findings related to Takayasu arteritis at age ≤40 years
2. Claudication of extremities
Development and worsening
of fatigue and discomfort in muscles of 1 or more extremity while in use,
especially the upper extremities
3. Decreased brachial artery
pulse
Decreased pulsation
of 1 or both brachial arteries
4. BP difference >10
mm Hg
Difference of >10
mm Hg in systolic blood pressure between arms
5. Bruit over subclavian
arteries or aorta
Bruit audible on auscultation
over 1 or both subclavian arteries or abdominal aorta
6. Arteriogram abnormality
Arteriographic narrowing
or occlusion of the entire aorta, its primary branches, or large arteries
in the proximal upper or lowe extremities, not due to arteriosclerosis, fibromuscular
dysplasia, or similar causes; changes usually focal or segmental
* For purposes of classification,
a patient shall be said to ahve Takayasu arteritis if at least 3 of these 6
criteria are present. The presence of any 3 or more criteria yields a sensitivity
of 90.5% and a specificity of 97.8%. BP = blood pressure (systolic; difference between arms).