Chronic kidney disease in patients with chronic back pain taking non-steroidal anti-inflammatory drugs

The aim of the study was to evaluate the incidence of chronic kidney disease (CKD) in patients with chronic back pain and nonsteroidal anti-inflammatory drugs (NSAIDs) intake not less than a year, and to study the interrelation between CKD, peculiarities of pain and its treatment. Material and Methods. 91 patients with axial spondyloarthri-tis — ax-SpA(ankylosing spondylitis and non-radiographic ax-SpA) and 35 patients with degenerative diseases of the spine (DDS) with NSADs intake not less than 1 year were involved in the study. The control group included healthy volunteers who did not took NSAIDs during the last year (n=51). By age, gender, factors of cardiovascular risk, GFR in patients with ax-SpA, DDS and controls were comparable. The activity of pain was evaluated according to the accepted recommendations. The index of NSAID intake as calculated for the preceding year. Results. GFR in patients with ax-SpAwas 87,0 [77,25; 102,0] ml/min/1,73 m2, 11 (18%) patients showed a reduction in GFR of less than 60 ml/ min/1,73m2. In patients with DDS GFR was 87,5 [65,5; 97,0] ml/min / 1,73 m 2 (p=0,27), decreased GFR of less than 60 ml/min / 1,73 m2 was detected in 3 (15%) patients. The ratio of albumin / creatinine urine in patients with ax-SpA was 35,8 [25,46; 43,4] mg/g, in patients DDS —207,1 [91,66; 244,59] mg/g (p=0,0001), in healthy individuals —25,45 [17,34; 33,65] mg/g. Conclusions. Patients with chronic back pain taking NSAIDs for a long time have revealed GFR, comparable with healthy people, and increased urine albumin. Patients with degenerative diseases of the spine have a greater index of albumin in urine than patients with ax-SpA.