Question - adverse effects of administering dry oxygen

[karthikduraisami]

hi

I would like to know the adverse effects of administering dry oxygen through oxygen mask to patients who are ventilated and un conscious.

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[Fiona Schreuder]

If they are ventilated you cannot deliver oxygen via a face mask!!!

[aroun2000]

hi

advers effects depends on the secretion of mucus in the bronchioles. Mostly moistured oxygen wtih normal saline is advisible.

chio

[adeolatobi]

The adverse effect is simply mucociliary dysfunction.
1. U dont administer dry O2 to a ventilated patient.

2. Administering dry O2 with saline or cold water bubble such as is common on the wards is as useless as administering dry O2 itself.

3. For optimal mucociliary function, dry O2 has to be heated and humidified to 37 degrees and 100% relative humidity, (RH) respectively.

4. The process of heating and adding moisture to the O2 is achieved through the nose mainly and the airways, this is however, bypassed in a ventilated patient by the endotracheal tube.

5. Hence, heated & humidified O2 is administered to a ventilated patient via appropriate ventilator & humidifier.

[shane246]

In reply to adeolatobi,
Your point "3. For optimal mucociliary function, dry O2 has to be heated and humidified to 37 degrees and 100% relative humidity, (RH) respectively." is widely accepted particularly for ventilated patients, but what is the foundation of the other common conception you list as "2. Administering dry O2 with saline or cold water bubble such as is common on the wards is as useless as administering dry O2 itself."? This is of course relevant and true with ventilated patients, but what of those in which the upper airway is not being bypassed? What is the role and or advantage of cold vs. heated humidification in an extubated patient on simple oxygen therapy?
What about those on NIV - I think all of us can understand the need to humidify with the higher flows and pressures, but should it be cold or heated given the upper airway is still in play? Why do manufacturers continue to supply and promote hot & cold systems for use with oxygen therapy & NIV? Is there an evidence base to support either way?