Just an FYI, PAP pressure units are cm-H2O. 7 PSI would blow your lungs apart.
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With a BiPAP you have an alternative to using BiFlex. With Biflex disabled you can adjust the "rise time". Rise time is the time it takes for the device to change from EPAP to IPAP. This screen allows you to adjust the rise time so you can find the desired setting. This is only available if Flex has been disabled and the device is in Bi-level or Auto Bi-level mode.
• 0 (off) reduces the Rise Time feature to the lowest setting (off = 150 msec).
• 1 sets Rise Time to 1 (200 msec).
• 2 sets Rise Time to 2 (300 msec).
• 3 sets Rise Time to 3 (400 msec).
So if you are still feeling the machine rushes you to the next inhale, a higher rise time will slow that transition from EPAP to IPAP.
Thanks all for your replies. Sorry I haven't continued to participate in the discussion, but life has finally slowed down. Whether elicit replies or for the sake of posterity, my findings are below.
I returned my machine for a new one and the new machine continued with the same problem.
The BiPap machine switches to the high pressure setting when it senses a drop in pressure. The "assumption" that the bipap is making is that any drop in pressure in the user inhaling. Unfortunately, an air leak elsewhere in the system (usually the mask) also causes a drop in pressure, which the bipap treats like an inhalation.
After figuring this out, I went through 4 different masks, attempting to find something with zero leakage. I've come pretty close with a nasal pillow setup (can't remember the name off-hand) that has a plastic stabilizing frame.
Still, my machine continues to switch to high pressure immediately after inhalation, though not quite as often. There have been times when I am certain no leak is coming from my mask, but the pressure issue persists.
It hit me yesterday that the air leak may be occurring within my humidifier. There are 3 rubber connecting points (1. from the bipap to the humidifier, 2. to the tank, 3. from tank to the hose), any of which may leak air at a given time, causing the bipap to "think" I'm inhaling and react accordingly.
When I was having issues last night, I removed the humidifier and connected my hose directly to the bipap and the pressure issue disappeared almost entirely.
I checked the connectors this morning and found no damage, corrosion, bending, flexing or anything of that nature. Maybe it's just not fitting correctly. Maybe I push the tank too hard into the humidifier, which prevents a good seal on the 3rd rubber connector.
Until next time...
Drew, all of those silicone connectors are removable. I would remove and clean each one and ensure it is reassembled properly. It sounds like you're getting closer to finding the issue by process of elimination, and that is commendable work. The seals on the inlet side of the humidifier are called the dry-box seals, and replacements are available. The humidifier lid seal is also available. It's possible one of those is just not seated properly.
I didn't realize they are removable. Is there any trick to removing and replacing without damaging them?