Childhood Adenotonsillectomy Trial

6.8.3 Nasal Flow Limitation

Nasal flow limitation is derived from the nasal cannula signal. A normal flow signal will present a regular sinus rhythm and curve. Flow limitation may occur with increase upper airway resistance, not sufficient enough to cause discrete apneas and hypopneas. A regular sinus curve will transform into a signal that resembles a lower case ‘h’.