Events look a bit weird to me, but I am pretty much a newbie

[Sleepy Pete]

I was looking at the flow rate graph and found these events. I'm looking quite closely at this one night because it's also the night of a home sleep study (embletta) and I have an appointment with a doc in a couple of weeks about it.
Comparing some of the events looks a bit weird to me though I'm inexperienced at reading these things. Really I just wondered what any of you guys thoughts were about them.

This is an obstruction:


This is a hypopnea:


This is just snoring? (to me the 2nd VS2 looks worse than the hypopnea)


This isn't an event at all? (looks like an obstructive to me)


Maybe discussion with the doc will explain a bit but I thought I'd put it out there for you guys because so far I've had some really helpful info from you all, actually much more info from here than from the doc and the equipment supplier together.

Thanks again,
Pete

P.S. The scale is the same on all the graphs.

[Pugsy]

This isn't an event at all? (looks like an obstructive to me)

It could have been an open airway cessation of breathing also but it didn't last long enough to earn a flag. The big breath right in the front of that reduction in air flow makes me think maybe a central that is more post arousal (you were maybe partly awake and don't remember) than it is related to airway collapse...meaning you just paused your breathing briefly. It's common.

This is just snoring? (to me the 2nd VS2 looks worse than the hypopnea)

The airway collapsed and snores occurred but again it didn't meet criteria to earn some sort of apnea flag. I suspect the air flow reduction wasn't at least 40 to 50% despite it looking like it should meet that criteria.
I can't see the second marks to count duration and sometimes even when we can it's hard to figure out exactly when it began and ended.

Criteria...at least 10 seconds in duration and a certain percentage of air flow reduction determine which flag gets earned.
Anything less and it doesn't earn a flag. I don't remember for sure but maybe 50% reduction for hyponea with a Respironics machine and 90% for OA.

Figuring out what is going on by evaluating air flow patterns at this level takes a lot of experience and looking at lots of patterns and I still have a lot of trouble even with all that I have looked at.