Primary ciliary dyskinesia (PCD) classification according to the European Respiratory Society guidelines for the diagnosis of PCD [30]. Primary ciliary dyskinesia (PCD) classification according to the European Respiratory Society guidelines for the diagnosis of PCD [30]. ODA: outer dynein arm; IDA: inner dynein arm; MTD: microtubular disarrangement; nNO: nasal nitric oxide; CBP: ciliary beat pattern; HSVMA: high-speed video microscopy analysis. Bruna Rubbo, and Jane S. Lucas Eur Respir Rev 2017;26:170023 ©2017 by European Respiratory Society