Fig. 3.

Examples of sleep disordered breathing with definition of pause length. A strip chart recording in seconds illustrating four of the core measures (from the top) of EEG, pressure (nasal airflow), heart rate (HR), box flow (breathing efforts), and oxygen saturation (SAT %). The four boxed areas illustrate pauses of varying lengths as defined by the effort signal. The first (A) is an intermediate, ~7 breaths, pause; the second (B) is a short pause, ~2 cycles; the third (C) is a long pause with ~9 breaths pause; and the last (D) is a short pause (2 effort cycles). Only the rabbits with hyaluronic acid injections exhibited intermediate and long cycle pause.