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I would say in general I have more apnea events toward morning, probably because I am sleeping less soundly. Do you know what the ratio is of your obstructive events is compared to central apnea events? Central apnea events tend to be more erratic and are not controlled by a CPAP.
Have you investigated downloading SleepyHead to get a more detailed picture of your sleep data? It requires a PC or Mac, and a SD card reader, as well as a compatible CPAP machine.
It is not uncommon for central apnea to increase with CPAP treatment. The issue is that obstructive apnea is well controlled with increased pressure. However the increased pressure can upset the O2 and CO2 balance in the blood, and cause central apnea. So in many apnea sufferers the amount of pressure used is a tradeoff. On a theoretical basis one might reduce pressure if central apnea exceeds obstructive apnea. However the real world is more complex. More often different pressures are tried until the total apnea is a minimum. On an auto machine is sometimes accomplished by reducing the maximum pressure to limit the central apnea events. Or another option is to just switch it to fixed pressure CPAP mode, once the best pressure is found.
The standard objective is to be under 5 for AHI. With central apnea as an issue I have a bit of trouble always doing that. My wife on the other had who has almost no central apnea, is usually under 1.0 for AHI.
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