Figure 1. Snapshot from the EncoreAnywhere database, generated from high resolution flow (“waveform”) data.

Each horizontal line is 6 minutes long. The red line is the pressure output, with a treatment auto-CPAP range set at 10–15 cm H₂O in this 46-year-old male, without heart failure, but severe periodic breathing and obstructions on the baseline assessment. Increasing or narrowing the pressure range of the auto-CPAP had minimal effect on the residual device-detected respiratory event indices. Highlighted in green is machine detected periodic breathing; green bars represent machine-detected obstructive apneas, yellow bars designate “vibratory snoring.” Note large numbers of missed overt severe hypopneas/apneas (arrows) and periodic breathing with relatively short (approximately 20 seconds) cycle length.