I just had a sleep study and got done talking with a pulmonary specialist about my results. My symptoms are caused by my asthma, and during the sleep study I only averaged about 7 hypopneas per hour.
However, my oxygen saturation dropped to 72% at one point during the evening. All told, my oxygen saturation was in the 70-80% range for 4 minutes and the 80-90% range for 4 minutes. There was one 2 minute twenty second period of time where my oxygen saturation was below 90%. He told me that I needed to be fitted with a cpap machine if I wanted further therapy, but that mine was only a mild case.
I was wondering if anyone can help me since I didn't have a chance to ask these questions to my doctor. What are the consequences of having your oxygen saturation in the 70-80% range for 3 minutes throughout an evening? I understand that below 90% is considered hypoxemia, so isn't it dangerous if the oxygen saturation is 72%, even for a short period of time? Do people without "sleep apnea" have occassional decreases in their oxygen saturation to below 90%? Any help would be much appreciated.
I realize that my case is mild compared to most, but I figured that since my apneas are caused by bronchospasms, maybe the number of hypopneas aren't as much a concern as the very low oxygen saturation. 2 minutes seemed like a long, continuous period of time to be below 90%, but maybe it's more common than I realize, or less dangerous. Either would be refreshing.
Thanks in advance to anyone that offers help.