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au´ris sinis´tra (left ear).
Symbol for arsenic.
AS[L.] au´ris sinis´tra (left ear).
ASaortic stenosis; arteriosclerosis.
symbol for the element arsenic.
abbreviation for aortic stenosis.
AsThe profile area of a slab-sectioned corpuscle or nucleus, a quantity measurable by image cytometry.
absence of seizures
Associate of Science
Associate Specialist (Medspeak-UK)
Symbol for arsenic
ankylosing spondylitis; AS autoimmune disease of young men of human leukocyte antigen (HLA) B27 tissue type, characterized by high titres of tumour necrosis factor, progressive spondyloarthropathy, inflammatory back pain, limited spinal mobility, limited chest expansion and sacroiliitis; typically presenting with bursitis, buttock and heel pain, marked early-stage systemic fatigue, late-stage increased spinal curvature and spinal ankylosis ('bamboo' spine); foot problems (e.g. pain, plantar and posterior heel spur formation, soft-tissue swelling and bursitis) occur in the earlier stages; late-stage foot symptoms include joint erosions, periosteal proliferation and anklyosis due to joint margin exostoses (Table 1)
|Leukocyte antigen type||90% of patients with sero-negative arthritis test positive for human leukocyte antigen (HLA) B27|
|Skeletal involvement||Axial skeleton/spinal involvement; with back pain (common presenting first symptom)|
|Enthesopathy||Inflammation at insertions of ligaments/tendons (posterior calcaneum, plantar calcaneum, base of fifth metatarsal, forefoot)|
|Soft-tissue swellings||Localized swelling at Achilles tendon insertion|
Bursitis of congenital/adventitious bursae
Generalized swelling of fore foot
|Vasculitis||Note: Does not tend to affect foot in sero-negative arthritides|
|Radiographs||Bone/periosteal fluffy/'whiskery' proliferation|
New bone/spur formation at entheses, secondary to inflammation
chemical symbol, arsenic.