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Troubleshoot — Cannot Desaturate

Some cus­tomers have issues desat­u­rat­ing with the sys­tem.  This is a bit tricky because there are sev­er­al pos­si­ble issues includ­ing the cus­tomers phys­i­ol­o­gy.  This process checks for every pos­si­ble sys­tem fail­ure, and pro­vides a sub­jec­tive test for tricky users.

There are a hand­ful of issues that may make a new user think LiveO2 isn’t work­ing prop­er­ly because a pulse oxime­ter does not read­i­ly show a decrease in oxy­gen con­cen­tra­tion in the blood while using ‑O2. This often leaves the user won­der­ing what is hap­pen­ing…

This guide is intend­ed to help you sort out if the issue is a prob­lem with the sys­tem or unique to the phys­i­ol­o­gy of the user.

If the issue is with LiveO2, it’s easy to detect and cor­rect the prob­lems. When the issue is part of the user phys­i­ol­o­gy — It’s more dif­fi­cult to under­stand but still easy to test.

The list below is all of the pos­si­ble rea­sons we’ve ever encoun­tered why a user could not desat­u­rate.…

#1: Enthusiastic user cranked the oxygen flow meter too high

The oxy­gen flow meter should be set to 10 LPM or maybe slight­ly above. Some new users will open the oxy­gen flow to max­i­mum and the ball will be at the com­plete top of the oxy­gen flow range. This error will also cause the air sep­a­ra­tor to dis­play an amber light that will nev­er go off.

This push­es so much air through the air sep­a­ra­tor that both the oxy­gen con­cen­tra­tion in +O2 is low, and the oxy­gen con­cen­tra­tion in the ‑O2 is high. The extra oxy­gen at the ‑O2 set­ting often pre­vents users from desat­u­rat­ing.

#2: User has a metabolic issue that interfere with blood oxygen exchange

Many new LiveO2 users have meta­bol­ic issues that inter­fere with blood gas exchange. There are three com­mon dys­func­tions:

  • Cap­il­lary shunt­ing. These users exhib­it unusu­al­ly high O2 sat­u­ra­tion lev­els because issues flow restric­tions in cap­il­lary beds shunt blood around tis­sue. Oxy­gen lev­els remain high because oxy­gen nev­er reach­es tis­sue and is under used.
  • Nutri­ent defi­cien­cies. The body requires suf­fi­cient amounts of B‑vitamins to effect gas trans­fer to the tis­sue. Defi­cien­cies inhib­it trans­fer and may inhib­it the abil­i­ty to sat­u­rate or desat­u­rate.
  • Car­bon Monox­ide. Car­bon monox­ide has a high­er affin­i­ty for hemo­glo­bin than oxy­gen, and may be due to envi­ron­men­tal expo­sure or inter­nal­ly gen­er­at­ed as a result of dys­func­tion­al cel­lu­lar res­pi­ra­tion. Pulse oxime­ters can­not dis­tin­guish blood car­ry­ing car­bon monox­ide from blood sat­u­rat­ed with oxy­gen. Users with car­bon monox­ide will not desat­u­rate. Pubmed Arti­cle Here

These issues often hap­pen togeth­er. Each ele­ment reduces the user’s appar­ent abil­i­ty to desat­u­rate as read by a pulse oxime­ter.

  • Shunt­ing pre­vents oxy­gen from leav­ing the blood
  • Nutri­ent defi­cien­cies pre­vent oxy­gen from leav­ing the blood
  • Car­bon monox­ide and oxy­gen are indis­tin­guish­able by a pulse oxime­ter.

But… No mat­ter how these fac­tors inter­fere with the pulse oxime­ter there is a very effec­tive test.

The users will feel the ‑O2 chal­lenge. Inef­fi­cient res­pi­ra­tion makes users very sen­si­tive to reduced oxy­gen lev­els. That leads us to…

The simplest test for a new user

If your users feel extra dif­fi­cul­ty on the ‑O2 set­ting then this is a strong and reli­able indi­ca­tor that the sys­tem is work­ing prop­er­ly.

Most users will slow down on ‑O2 and speed up on +O2. Users with com­pro­mised res­pi­ra­tion will quick­ly notice the decrease in oxy­gen from 75% to 14%.

#3: Ripped breather hose

This occurs when the breather hose is pulled so hard the mem­brane between the ribs rips and allows room air to leak in when the user inhales.

This leak allows room air to dilute both the +O2 and ‑O2 air which inhibits both oxy­gen sat­u­ra­tion and oxy­gen desat­u­ra­tion.

The best way to test this is to care­ful­ly inspect the hose to assure the mem­brane between the ribs is intact for the entire length of the hose.

Tuto­r­i­al: Inspect and replace a dam­aged breather hose

If you doubt your inspec­tion, remove the breather hose from the reser­voir and plug one end with your thumb. Air should not escape when you blow air in from the unplugged end.

If air escapes or you find a tear you will need to replace the breather hose.

#4: Failed Air Separator

Each air sep­a­ra­tor has an inter­nal tester to assures air is sep­a­rat­ed into oxy­gen rich, +O2, over 75% and oxy­gen reduced, ‑O2 mix­tures, below 16%.

This is the amber light tester assures that oxy­gen is at least 75% pure. At a 10 LPM flow rate, it also assures that the ‑O2 lev­el is less than 16%.

Amber light is off — sys­tem is work­ing prop­er­ly.

This test allows LiveO2 users to know their sys­tem is always work­ing with­out need for repeat­ed test­ing. We test all air sep­a­ra­tors before ship­ping, but they can fail over time, and some­times dur­ing trans­port.

When an air sep­a­ra­tor fails, the amber light glows like in the image below. If you see this then go to the amber light diag­nos­tic.

#5: Failed Valve

This one is very rare.

Switch­es between +O2 and ‑O2 should cause dis­tinct and audi­ble latch as the valve locks into the oppo­site posi­tion. This latch mech­a­nism assures three things:

  1. The mechan­i­cal com­po­nents of the valve are work­ing prop­er­ly each time the user switch­es;
  2. The valve ful­ly switched between ‑O2 and +O2 air to dis­al­low mix­ing inside the valve;
  3. The valve is inter­nal­ly sealed.
Demon­stra­tion of Prop­er func­tion­ing valve with latch effect

If you there is no dis­tinct latch. Please con­tact cus­tomer ser­vice.

#6: Internal Reservoir Leak

If you are still hav­ing prob­lems dis­con­nect the breather hose and insert it into the over­flow release port

This iso­lates the air sup­ply to only ‑O2 bypass­ing the oxy­gen reser­voir and valve.   Exer­cise breath­ing this air.   If you desat­u­rate with this con­fig­u­ra­tion dif­fer­ent­ly than on the ‑O2 set­ting please con­tact cus­tomer ser­vice.

All else fails Order a Tester

Con­tact sup­port and we can pro­vide a sep­a­rate oxy­gen tester which will enable you to test the actu­al out­put of oxy­gen from the reser­voir at the mask.

We put this last because every air sep­a­ra­tor has a built in tester which is con­tin­u­ous­ly tests the oxy­gen lev­el cre­at­ed by the air sep­a­ra­tor. This built in tester con­tin­u­ous­ly assures prop­er oxy­gen con­cen­tra­tion.

Our sup­port depart­ment can option­al­ly pro­vide an oxy­gen tester to con­firm the lev­els are cor­rect as deliv­ered to the mask. Oxy­gen Test Meter Deposit

Relat­ed arti­cles:

Updated on August 1, 2019

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