Detection of three consecutive obstructive apnoeas using the PneaVoX tracheal sound sensor. 1) Absence of tracheal sound (absence of respiratory cycles on the flow sound intensity and the snoring intensity signals). 2) Absence of oronasal flow on the thermi... Detection of three consecutive obstructive apnoeas using the PneaVoX tracheal sound sensor. 1) Absence of tracheal sound (absence of respiratory cycles on the flow sound intensity and the snoring intensity signals). 2) Absence of oronasal flow on the thermistor signal. 3) Absence of nasal pressure on the nasal pressure signal. Thomas Penzel, and AbdelKebir Sabil Breathe 2017;13:e37-e45 ©2017 by European Respiratory Society