Efficacy as first, second and third bDMARD in patients with axial spondyloarthritis. ASAS, Assessment of Spondylo Arthritis international Society; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; bDMARD, biological disease-modifying antirheumatic drugs; IL-17i, interleukin-17 inhibitor; TNFi, tumour necrosis factor inhibitor. . Efficacy as first, second and third bDMARD in patients with axial spondyloarthritis. ASAS, Assessment of Spondylo Arthritis international Society; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; bDMARD, biological disease-modifying antirheumatic drugs; IL-17i, interleukin-17 inhibitor; TNFi, tumour necrosis factor inhibitor. Victoria Navarro-Compán et al. RMD Open 2017;3:e000524 Copyright © BMJ Publishing Group & EULAR. All rights reserved.