PROGRESSION AND OUTCOMES OF UVEITIS IN PATIENTS WITH ANKYLOSING SPONDILITIS

Uveitis is a common extraskeletal manifestation of ankylosing spondylitis (AS) occurring in 20–40% of patients. Most
authors underline a favorable prognosis for AS-associated uveitis.
Objective: to study features of clinical picture and progression of AS-associated uveitis and to estimate the occurrence of its complications.

Subjects and methods. Across-sectional study of 140 patients (98 males and 42 females) with AS, who had at least one uveitis attack over the period of disease and was followed up at V.A. Nasonova Research Institute of Rheumatology during 2008–2012. In addition to standard rheumatologic examination all patients were examined by ophthalmologist. Biomicroscopy, ophthalmoscopy, tonometry, computer-assisted perimetry, ultrasonography (B-scanning) of eyes and, if needed, fluorescein angiography and electrophysiological examination of retina were performed. Localization of uveitis, presence of complications affecting vision, total number of uveitis attacks by the moment of examination, mean number of uveitis attacks per year, correlation between the frequency of attacks and complications, presence of other extraskeletal manifestations and peripheral arthritis were assessed. The total number of uveitis attacks was defined from patients' interviews and respective medical documentation. Mean number of uveitis attacks was calculated as ratio of total number of uveitis attacks to the duration of disease for each patient. In the case of more than two attacks per year uveitis progression was considered
refractory.

Results.Mean duration of the disease was 17.7±11.03 years. In 19 patients (14%) AS manifested before and in 121 (86%) – after the age of 16 years. HLA-B27 was revealed in 135 (96%) patients, peripheral arthritis – in 43 (30%), whereas other extraskeletal manifestations – in 46 (32%). Early onset of uveitis in first 10 years of the disease was recorded in 81 (58%) patients, after10 years – in 21 (15%). Uveitis was the first clinical symptom of AS in 37 (26.4%) patients. 33 (24%) patients had more than 10 uveitis attacks during the disease, 17 (12%) – more than two attacks per year, whereas 18 (13%) had chronic uveitis. 118 (84%) had localized iridocyclitis, 12 (8%) – panuveitis, 2 (1%) – localized posterior uveitis. 122 (87%) patients had unilateral uveitis, 18 (13%) – bilateral, whereas 45 (36%) – alternating eye lesions (OD-OS). Uveitis complicated with vision impairment was observed in 41 (29%) patients: synechia in 26 (18%), vitreous degeneration – in 20 (14%), cataract – in 32 (23%), glaucoma – in 13 (9%), maculopathy – in 6 (4%), ribbon-like retinal degeneration – in 6 (4%), partial optic nerve atrophy – in 3 (2%). Authors revealed direct correlation between frequency of uveitis attacks and occurrence of synechia, cataract, glaucoma, vitreous degeneration.

Conclusion. AS-associated uveitis is predominantly characterized by unilateral iridocyclitis (84%) and the onset in the first 10 years of disease (84.4%); 25% of cases were remarkable for frequent relapses: more than two attacks per year and more than 10 during the period of disease. One third of patients demonstrated vision impairments, and its progression correlated with the frequency of uveitis attacks.

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