00:00
Okay, now we got some mask with some accoutrement. So look
at that. You can see in the picture
we've got a mask, it's got a strap that goes around the back
of the patient's head. It's got
that tubing, that's the one that we would connect to an
oxygen tank or to a wall outlet. And
then it's got this rectangle at the bottom. That's actually
a bag or what we call the reservoir.
00:22
So these are how this work. They can either be a partial
rebreather or a non-rebreather.
00:28
These are both considered reservoir masks and what makes a
reservoir mask a reservoir mask
is, you got it, the reservoir, the bag on the bottom. The
simple face mask, remember that,
had no accoutrement, they had no reservoir. So, that's what
makes a reservoir mask have that
name. Kind of ever run that into that ground but I don't
want you to forget it. Now, both masks
resemble the simple face mask except they just have that
extra bag. This mask delivers a
higher concentration of oxygen for people who have some
pretty serious respiratory
complications. Okay, so if I'm lining this up in my mind,
I'm going to start with a nasal cannula,
the next highest would be a simple face mask, the next
highest concentration of oxygen
delivery would be a reservoir mask. You got it. That's
critically important that you don't
speed past that because nurses need to know which device
provides the most concentration
of oxygen. Why would I use one over the other? And you could
base it on the variables that
you see with that particular patient. Okay, so you got the
feel for it. Nasal cannula, simple mask
without accoutrement or reservoir. Now, we're going to talk
about the 2 types of masks that have
reservoirs. Okay, so a non-rebreather delivers the highest
concentration of oxygen. Let's
pause for just a moment, pay a little respect to the
non-rebreather. So if I've got somebody
who is able to breathe on their own but still needs a really
high concentration of oxygen, this
is my #1 choice because 100% oxygen can only be delivered
with a ventilator or a super
tight-fitting mask. So this one gives us a high
concentration but it's not really going to be
actually delivering 100% oxygen. A ventilator can do that
because we have a tube in your
mouth right down into your trachea and we can specifically
deliver volumes and the external
air is not messing us up. But with a mask that's kind of
loose fitting, you'll have lots of gaps
around that with a patient, you're not going to be able to
deliver a pure 100% oxygen because
of the mixing. Now, reservoir masks have one way valves.
Okay, that's to stop the outside air
from mixing. That's why they can deliver the highest
concentration. Now I want you to take a
look at this mask. You already recognized the tubing; you
already recognized the bag, the
reservoir; I want you to look at the mask. Remember we
talked about the simple face mask, it
had those exhalation holes on the side. Right? So when they
breathe in, you also have air
coming in the hole sometimes. Right? But then when you
breathe out, the air went out the
side. Now look at this mask. You see that the color is
different. That's because the holes are
there, that's so you can still exhale but there's a little
cover. Now let me explain how that
works. The cover is over those holes. If I breathe in, that
cover is flat against those holes and
all I'm going to be breathing in is air from that bag. So
when I inhale, that's a very thin kind
of rubbery plastic, it will close tight against those holes
and the air I'm breathing is going to
come straight out of that reservoir. But what's supplying
the air in that bag? That tubing,
the oxygen tubing. So by wearing this mask and having that
special one-way valve on the side
over those holes, when I breathe in these valves, they'll
close tight and so the only place I'm
getting air is from the reservoir. Okay? So I want you to
slow down and make sure you have
that concept. A one-way valve doesn't look very special,
it's simple but it is functional. Same
holes as in a simple mask, but you put a one-way valve over
those holes. When you breathe in,
they close; when I breathe out, they kind of flap and allow
me to exhale out the side. That's
why non-rebreather masking delivers such a high
concentration of oxygen. Not perfect, but
it's definitely better than a simple mask. So the
non-rebreather, that's why it's a low-flow
oxygen device with a very high FiO₂. Remember, it's that
reservoir bag and that one-way valve
that's the killer combo. The reservoir bag facilitates
higher concentrations of oxygen and the
one-way valve prevents the patient from inhaling expired
air. Remember, you've got those
valves on both sides of the mask. When the patient breathes
in, those valves close and so the
only air the patient's breathing is the air from the
reservoir. When you exhale, they open and
air goes out those holes. Non-rebreather, reservoir, and
one-way valve. That's what allows
you to have a low-flow oxygen device and a high FiO₂. Now we
can set up between 10 and
15 liters per minute. Now again some people might debate
this, but usually you want a flow of
at least 10 liters a minute to fill that bag with enough
volume to be inhaled. So we're going to
do it about 10-15 liters which should be about 80%-95%.
Remember, you can't get a perfect
100%. Why? Right, because this isn't a super tight-fitting
mask. Now if you're the patient
wearing it, you're going feel like it's pretty snug but
there's going to be gaps around because
it's just a universal mask, it's not fit particularly for
that patient. Try not to keep patients
on 15 liters for longer than you absolutely think is
necessary because if we're overoxygenating
a patient for prolonged periods of time, it can be harmful
to them. Oxygen should be treated
like a drug, has specific orders for it, and do your best if
you walk in to a patient, start taking
care of them, and whatever they're on be on the same page
with the healthcare provider.
06:47
Are we titrating up or down, don't just let things hang out
for no reason. Always ask why is my
patient receiving this treatment, is it appropriate, should
we be weaning, should we be increasing?
Remember that flow has to be as sufficient enough to keep
that reservoir bag from deflating
when the patient takes a breathe in. That's why I usually
recommend a minimum of 10 liters.
07:13
So, patients who are severely hypoxic, this is a good
choice. But they have to be able to breathe
on their own. So, hypoxic means low oxygen in their blood
but they have be able to breathe on
their own. This isn't going to help somebody who has had an
opioid overdose. Right? At least
not before we give them naloxone or the Narcan. So I have to
be able to breathe on my own,
but for some reason I have low arterial oxygen. Okay, let's
walk through this one more time
because I really want to make sure you have it. See how the
tubing fills the reservoir bag so
the oxygen delivers through the tubing into the reservoir of
the bag. On inhale, that one-way
valve is going to suck to the side of the mask and it's only
going to allow the patient to get
air from the reservoir, the concentrated oxygen delivered by
the tubing. When I exhale, the
one- way valve in between the mask and the bag will close.
The one-way valve on the sides
of the mask will open up and you expire air through that
way. So we've got more than 1
one-way valve. Right? On the mask and in between the mask
and the bag, they work at opposite
times because when I go to exhale it's going to close in
between the mask and the bag preventing
my expired air from going into the bag and forcing my
expired air to go out of the sides of the
mask. It's really simple, but really ingenious. Okay, so
let's compare the tubes, a partial
rebreather and a non-rebreather. Now let's look at the parts
that are the same. They both
have mask, check check. They both have a connection between
the mask in the bag, check
check. They both have bags, check check. Now you can't see
it here, but they both would have
elastic straps so it help keep the mask on the patient's
face. So, what's the difference between
the two? It's all about the valves. Look at the
non-rebreather. They have one-way valves on
the mask and in between the mask and the reservoir. So, the
partial rebreather allows for
mixing of inspired and delivered oxygen, right. So because
there's no one-way valve there,
you can see that it goes both ways. So when the patient
breathes in, they get air both from
the bag and kind of mixing up in the air and when they
breathe out some of that air will also
down in the rebreather in the bag. So you've got the partial
rebreather. The non-rebreather
has a lot more control. It has the valves up here on the top
and the valve in the tubing
between the mask and the bag. So when you breathe in, these
valves close so no air from the
room comes in, this valve is open and I only get air the
oxygen that's 100% oxygen from the
reservoir bag and when I breathe out the valve in the middle
closes so none of my expired
air goes down in to the bag, it only goes out the one-way
valves in my mask. So that's the
difference. The difference between a partial rebreather and
a non-rebreather are one-way
valves, both on the mask and in the piece in between the
mask and the reservoir.