Table 2.

Drive-related event pathophysiology

Characteristic	All Subjects
Reduction in EMGgg, %baseline	18 (−1 to 35)
Increase in negative pressure swings, Pes, %baseline	7 (−4 to 22)
Reduction in drive, EMGdi, %baseline	19 (11 to 33)
Reduction in ventilation, %baseline	65 (55 to 76)
Increase in obstruction, %baseline	56 (35 to 75)

Definition of abbreviations: EMGdi = diaphragm electromyography; EMGgg = genioglossus activity; Pes = esophageal pressure.

Continuous data are shown as median (interquartile range). Values are taken from ensemble-average event analysis for each patient and represent the change in each respiratory variable from pre-event baseline to the point of nadir ventilation. Note that pressure swings increase during events, in contrast to falling EMGgg, drive, and ventilation. Increase in obstruction is calculated from the percentage reduction in flow:drive ratio.