Frequency and clinical and laboratory features of ankylosing spondylitis with secondary AA-amyloidosis

In a specialized rheumatology department, the frequency of AA-amyloidosis in patients with AS reaches 4.5%. Amyloidosis significantly more often develops in males, in patients with juvenile onset, in the late stage of the disease, in patients with high disease activity. Without a targeted search for secondary amyloidosis in patients with AS, its detection rate in real clinical practice is about 30%.