00:01
Now, you know the definition
of Refractory Hypoxemia.
00:04
Let's talk about some
of the interventions.
00:06
To I'm going to address here just
briefly introduce you to them
are prone positioning and ECMO.
00:13
I'm going to start
with prone positioning.
00:15
Now you remember from nursing
lab how you had to learn
what supine was.
and what prone is.
00:21
You know what those represent,
but remember if a patient is in bed,
we either usually have them supine on their
back or return them to their right side
or return them to their left side
and prop them up with pillows.
00:35
Rarely, if ever do you see
a patient on their belly,
unless we're trying
to address ARDS.
00:41
Now we use this with
refractory hypoxemia,
but there's a school of
thought out there that says
any patient with ARDS should
be placed in the prone position
for certain number
of hours a day.
00:52
They think it's most effective if
we start earlier in the stages,
but again, there's going to be
a lot of discussion about this.
00:59
The physicians you work with and
the hospital where you practice
will also have an opinion on top of
the unique variables to each patient.
01:08
But I want you to know
what prone positioning is.
01:11
So, you see what it looks like,
this guy's not just taking a nap.
01:14
If you look closely,
they're intubated.
01:16
So, off-screen,
what would be there is a ventilator.
01:20
See that's the thing about
ARDS, they're ventilated,
they have lots of other
tubes, multiple IVs, foley.
01:27
So, to get them into this position, it
takes a trained and skilled team to do it.
01:33
So, why would we go
through all that?
Let me tell you what the theories are
about the benefits of prone position.
01:40
Because of gravity, fluid tends to pool
in the dependent alveoli in the lungs.
01:45
Now,
that's back to you picturing.
01:47
What is supine? What is prone?
Prone is laying on your belly.
01:52
Supine is on your back where we
see most patients in critical care.
01:56
So, where are the dependent
alveoli if I'm laying?
Supine or on my back?
They're in the back.
02:04
Oh yes, that makes sense because
if we're thinking
about fluid volume,
or if we're thinking
about overload,
we always listened in the back
and the basis of our patients
because we know that's where
crackles develop first.
02:17
So, fluid pools in the
dependent alveoli in the lungs.
02:21
Most patients in critical
care in a supine position.
02:25
So let's talk about relativity.
02:27
Some alveoli are more
fluid filled than others.
02:30
Some have more air than others.
02:33
So, in relation to
someone in ARDS,
the dependent regions of alveoli are going
to be more fluid filled in comparison
to the non-dependent areas.
02:44
If I'm on my back,
the alveoli in the back
are the dependent areas.
02:49
If I'm on my belly,
wow, now where are
the dependent areas?
They're in the front.
02:56
And that's actually the theory
behind prone positioning.
03:00
That's what we're
trying to accomplish.
03:03
The patient on their
back or who's supine,
the heart and mediastinum put
added pressure on the lungs.
03:10
Now, also can increase
the risk of atelectasis.
03:13
Now, that's a touchy
subject in ARDS,
atelectasis,
that's the collapse of the alveoli.
03:18
We work really hard to try to reopen those
airways but it's not always possible.
03:23
So, prone positioning of the patient may
allow for the alveoli that our posterior
to become 'recruited'.
03:30
Okay, that's a funny term.
03:31
Let me tell you what that means.
03:33
Let's review.
03:34
If I'm on my back,
the dependent alveoli are in the back.
03:38
Right, these are the
non-dependent alveoli.
03:41
So, if I take the patient and I flip
them and I put them on their stomach.
03:45
Now, the dependent
alveoli are in the front
and the non-dependent
ones are now in the back.
03:52
This gives these guys
a fighting chance.
03:56
That's what the theory is.
03:58
If we can take the weight of that patient
off of their back, off of those alveoli,
give a chance for that fluid
to drain more toward the front,
we can recruit these alveoli and
give them the fighting chance
to try to open up
and be useful now.
04:12
Now, who should not
be prone position?
There's a lot of things there
but know that some people
cannot tolerate this.
04:21
If they have spinal
cord instability,
you do not want to pick them
up and flip them, right.
04:26
If they have a risk for spinal
instability, this is not a good option.
04:30
If they have unstable fractures,
parcticularly facial or pelvic fractures,
think what lying on
their stomach would do.
04:38
If they have burns anteriorly,
if they have chest
tubes, you're out.
04:43
If they have open wounds that
cannot be sutured closed.
04:47
If they're in shock, that is not the time
to be putting them in prone positioning.
04:51
If they're pregnant,
if they've had a recent tracheal surgery,
if they have elevated
intracranial pressure
because remember we need to keep
that head of the bed elevated.
05:00
So should you memorize all this?
No, this will make
logical sense to you.
05:05
I just want you to know,
what prone positioning
looks like?
How we think it
helps the patient
Most research supports if you do it earlier
in the phases you have better results,
but prone positioning
doesn't work for everyone.