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Posted by snoozin' on August 26, 2002 at 20:33:08:In Reply to: Re: We do not use Bipap with backup rate... posted by perplexed on August 26, 2002 at 07:46:53:
I have seen a back up rate used on central apneic pts. three times in my 7 yrs of sleep experience. I believe you should have at least one machine in the lab that has the back up rate capability.
Typically the patients that I have seen this done on have come back for a third sleep psg with orders from the MD outlining what they want the back-up rate and IPAP/EPAP set at. There first two PSG's have already covered the diagnostic part and attempts at CPAP (high pressures), BILEVEL (with wide splits between IPAP/EPAP)and even oxygen with no resolution of the central events (and ruling out an obstructive process).
For the person new to sleep and wondering what a back-rate is. Basically, what it does is ensure that the patient will get a gaurenteed resp. rate while being ventilated.
For example, say your patient is on BiLevel with a back-up rate set on the machine at 8 bpm (which is 1 breath every 7.5 sec). The moment the machine detects that the patient is taking longer than 7.5 sec to take a breath, it will deliver a breath for the patient. The timer(the countdown to delivering a breath) starts over after each patient or machine delivered breath.
Its a basic explanation and I hope that helps.
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