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Mixed Sleep Apnea
Mixed Sleep Apnea, or Mixed Apnea (MSA) is a hybrid of an
Obstructive Apnea, and a Central Apnea.  These typically start out as
Central Apneas where all respiratory channels are flat.  Then the Chest
and Abdominal belts start moving making it look like an Obstructive
Apnea.  So this starts out like the patient isn't even trying to breath,
then when they do try to breathe, the airway is blocked. 

Eventually the blood oxygen level (SpO2) drops, heart rate spikes, and
the patient will wake gasping for air often with a snore or a snort.  Often
the awakening isn't remembered and they go right back to sleep only
to repeat this cycle throughout the night.  This can be successfully
treated with CPAP.

To the right are a couple examples of Mixed Sleep Apneas.  The belts that are around the chest and abdomen initially don't move, indicating they aren't trying to breathe.  "Flow" is the sensor that shows breathing, which there isn't any throughout the Mixed Apnea.  Eventually the Chest and Abdomen belts start moving indicating the patient is now trying to inhale.  The C3,C4,O1, and O2 signals speed up, and the Chin electrodes (EMG2-EMG3) increase.  The breathing also resumes at this point.  The oxygen level drops by 4% or greater.
Mixed_Apnea_example_Picture_Sleep
Mixed_sleep_Apnea_Picture_EEG_Example_Study
The images to the right show clear Mixed Apneas.  The top Mixed Apnea picture is a 30 second epoch, where the bottom picture is a 60 second example of a Mixed Apnea.   Click on the image for a faster loading, but grainy picture.  Or click on the Blue icon for the same picture in a much higher resolution.  May take 10-30 seconds to completely load depending on your connection speed. 
Mixed_Apnea_example_Picture_Sleep
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