Fig. 1 (abstract P205).

The effect of apneas on respiratory status. (A) Distribution of apneas across a surgical population. Apneas >10sec were recorded in 99% (214 out of 216) patients in the post-operative period and 92% of the recorded apneas were <20s long. (B) Sustained MV over various time windows (30-sec – red, 60-sec – green, 90-sec – purple, 2-min – cyan) following the onset of apnea. Note that, an apnea of 30-sec will (by definition) drive MV over a 30-sec window down to 0, but will only decrease MV over a 60-sec window down to ~35% MVPRED and to less than 60% over a 2-min window. (C) Likelihood of an apnea of specific length to decrease MV below the Low MV cutoff over various time windows. Note that a single 10-sec apnea has just a 25% chance to decrease MV below 40% in a 30-sec window and less than 2% chance to decrease MV below the cutoff over a 2-min window. Even 60-sec apneas have just 20% chance of decreasing sustained MV over a 2-min window below the 40% MVPRED cutoff