Ox saturation and CPAP therapy

[dandan1978]

Hi,

I'm using CPAP for couple of years, after an adaptation period got to an average AHI of 1-2 a night, to monitor it's effectiveness using O2 Ring which is usually showing Ox range of 95-99% for 97-98% of the night, and 2-3% of the night (usually below 5 mins) est for 90-94% saturation. Very rarely showing few seconds of saturation range <90%.

From time to time I do get <90% saturation going for a short time (up to 2 min) out of 6 hours.

1. What is a length of time having <90% saturation (showing a drop to 86-87%) impacting brain health which should alarm me to contact sleep doctor / change CPAP settings? (After verifying is not resulted to an air leak)?
2. BMC report is showing Central Apnea Index of 0.2-0.4 (AVG per hour) - should I flag this to sleep doctor?

I'm planning having a coloscopy, will ox saturation to levels of 90-94% require an emergency action or only below 90%, as well central apnea ?
If there is a central apnea incident while sedated, will this be monitored?
How are these usually treated when under sedatation?

[Sleeprider]

Your oxygen variation seems normal. Supplemental oxygen is generally indicated if an individual has sustained low SpO2 (less than 88%) for long periods of time based on reliable monitoring with clinical grade oximetry. This article discusses some common criteria for home oxygen therapy. https://www.ncbi.nlm.nih.gov/books/NBK532994/

Your BMC CPAP, like others, may flag CA for a variety of reasons. The are breathing pauses where obstruction is not verified by the detection algorithm, and is not diagnostic of central apnea. It can even be as simple as an arousal or movement during sleep associated with a breathing pause. Don't even discuss this as an issue for colonoscopy. Your diagnosis of obstructive sleep apnea and use of CPAP is relevant information for the anesthesiologist. Anesthesia for colonoscopy is relatively light "twilight" sedation, and you will be monitored throughout the procedure. The anesthesiologist can control oxygen flow and in an emergency can intubate and ventilate, but that is very unusual.

[dandan1978]

Thank you for your reply, out of curiosity what is considered as an emergency (ox drop or something related)?

[Sleeprider]

Debilitating symptoms of dizziness or becoming incapacitated. Blueing or cold extremities. Your body is well-equipped to keep you breathing and to adjust your breathing rate or volume long before any of those symptoms occur unless you have a significant health problem or have ingested or been exposed to a toxic substance or asphyxiant that prevents it.