@farmerleebs, I wonder if hypotension or very low blood pressure may be causing the unresponsive episodes. See this article that @judithanne references earlier in this discussion:
- Cognitive fluctuations in Parkinson’s disease dementia: blood pressure lability as an underlying mechanism https://clinicalmovementdisorders.biomedcentral.com/articles/10.1186/s40734-018-0068-4

Is it possible that her blood pressure is low, but by the time she is seen by a professional her blood pressure has recovered? Do you have a home blood pressure monitor?

Hello again @farmerleebs

I appreciate the extra information you provided about your mom's episodes. Vitals, with a low normal might indicate, as Colleen, @colleenyoung, suggested that low blood pressure and/or low heart rate might also be a factor, I would encourage you, as Collen did, to have a blood pressure monitor available and to check your mom's BP and heart rate on a regular basis. Then when and if she has nother episode, you might be able to pinpoint if her BP drops lower than what is her ususal BP. Are you aware that the meds used for Parkinson's can also cause a decrease in BP? When she next sees her primary care provider, you might ask for a testing of her BP when she is seated and then again after standing and being seated again. This will often reveal this type of fluctating BP problem.

I also have Parkinson's and fight the low BP problem brought on by the Parkinson's meds as well as meds that I take for a heart condition. Given your mom's age, I'm sure she might be taking BP meds as well. Is your mom a diabetic?