As for the sleep itself, it was rough! If you've never had the pleasure of having a "sleep" study (it deserves the air quotes, believe me), it is not very restful. Poor KayTar was so hooked up (she had electrodes on her scalp, face, neck, chest, and legs; bands on her chest and stomach; a transcutaneous pCO2/O2 monitor; and a pulse ox probe on her finger) it made for a very fitful night. She was especially agitated by the nasal cannula and CO2 thermistor and tried to pull it about a thousand times (slight exaggeration). The tech came in to put it back in about 20 times (no exaggeration) and I had to tell her to leave it alone more than 50 times (no exaggeration). In the morning, I asked the tech if they were able to get adequate information with all of her waking and removal of the cannula and she said they did, so that is good. If they got good info, one mostly sleepless night will be well-worth it!
I could only glean limited information about how it went. I know that her transcutaneous CO2 was above 50 for all of the sleep time I observed (normal is below 45, but some docs don't treat until it is over 50 for a certain % of the night). I could tell she was about to wake up because it would go down to 44-45 right before she woke up and could tell when she was back to sleep because it was back to the 50s. During her last study, she was between 44-49 most of the night, but they were only measuring EtCO2 with the nasal cannula, so if she was blowing off CO2 from her mouth, it was not measured. The transcutaneous monitoring gives a more accurate picture, so I'm glad this lab uses it! The other data I have is her transcutaneous pO2 and it doesn't really mean much to me, because I can't find much information about the norms. Most of the night, her pO2 was between 40-70. The only information I could find about pO2 said it should be between 80-100, but that was where an ABG was concerned and not transcutaneous monitoring, so I don't know what to do with the information for sure. I couldn't see her oxygen saturations, so I don't know anything about those numbers yet. I won't know anything about central apneas until I hear from the pulmonologist, but I do know she stopped breathing once because she started kicking and I thought she was fussing and tried to calm her down and the tech told me she was still sleeping and to let her be. Later, she told me that she had stopped breathing and the kicking was an attempt to wake up/start breathing. Based on the limited information I have about her CO2 levels, I won't be totally surprised if we have to start some kind of night-time treatment for her after this (in which case, the little miss will have to adjust to having something in/around her nose at night). We'll see what Dr. J thinks of her study (hopefully soon!) and go from there.