Transcript
- All right, well thank you everyone for coming.
My name is Chris Pennell.
I'll be moderating today's webinar.
Today's webinar is SonoSite Behind the Scan webinar titled
The Power of SonoSite Systems
for Ultrasound Guided at Regional Nerve Blocks.
Before we begin, I have just a few things to cover.
All attendees are muted.
We'll be conducting a q and a session at the
end of the presentation.
However, we're currently broadcasting this webinar on
multiple platforms
and in order to ask questions,
you must be on the main zoom stream.
If you're on the zoom stream,
you can type your questions into the q
and a box in the toolbar located at the
bottom or the site of your screen.
Feel free to enter them throughout the presentation
and we'll get to them once the main presentation is over.
Now this webinar will be recorded
and archived for future reference on our webinars page.
Here with us today we have Dr. David Ayung. Dr.
Ayung is the medical director
of the Lindeman Ambulatory Surgery Center
and section head of Orthopedic Orthopedic Anesthesiology at
Virginia Mason Franciscan Health in Seattle, Washington.
His research focuses on improving patient outcomes
with regional anesthesia.
He's the co-author of the popular textbook,
ultrasound Guided Regional Anesthesia.
Dr. Ayung, thanks so much for being here
and let's get the presentation started.
- Thank you Chris. Great to be here
and talking about the new Sono site st,
or recently released Sono Site st.
This is a ultrasound that has a unique form factor
but still with the unrivaled image quality
of the sono site line.
So if you look at a sono site like this, it is ready
to go out of the box.
You turn it on and you are ready
to image it has all the features that you're used to,
but rarely do you have
to push much more than setting the depth
and adjusting the gain.
Like most sono site images, this is fully optimized
and almost ready to do any block as soon
as you turn your system on.
I haven't touched a single thing here
and to image this first block a tap block,
I generally just change the depth and maybe the gain,
otherwise the image is ready to use as soon
as you turn it on here.
Let's start by going right to the abdomen
and imaging the transversus abdominis plane.
To find this, I typically find the
rectus abdominis anteriorly.
Here you can see a beautiful rectus abdominis muscle below
that, some of the peristalsis of the abdomen.
Below that, as I move laterally, you can see the muscles
of the lateral abdominal wall, the external oblique,
internal oblique, and the transverses abdominis.
At this level, the image quality is so good.
You can see blood vessels between those
muscles in the fascia planes, as well as some
of the nerves in the fascia planes as well.
To give you idea how good this quality is, even
with a high frequency linear transducer, I'm able
to move all the way posterior
and see the next muscle in the similar plane,
the quadratus lumborum muscle.
You can see the striations of that muscle
with great image even allowing you to do
that without even changing your transducer.
Now, to give you an idea how easy this machine is to use
and to get a great image, we'll go right from the tap plane
and move up to the brachial plexus level A block
that's likely much shallower.
Here we'll use the same transducers.
I haven't touched the single setting
and I'll put it right on the patient.
So now we're imaging the supraclavicular view
and we can see I maybe need to change depth
with this touch screen.
I can move this image
and change the depth by moving the depth button over here.
I can also use the arrows
to change the depth shallower and deeper.
Also, I may need to change the gain. To change the gain.
All I'm gonna use is this slider button here
to make it brighter and darker.
Also, I'm able to change the time gain compensation
or the tcs.
This allows me to change the brightness of the bottom
half of the screen, the middle part of the screen
or the top part of the screen,
or even use the slider to move up and down
and change any part of the image brighter or darker.
Here I'll make the near field a little bit darker
and I think that gives me a uniform appearance
of my entire image.
Next, we'll go and scan the brachial plexus
and moving up to the inner scaling level.
Here you can see the brachial plexus to the right
of the artery sitting on the first rib.
As I move up, we'll trace those nerves up
to the inner scaling level.
At the inner scaling level, I'm able
to see three distinct circles, the C five
and the two sles of the C six nerve roots.
The C seven nerve root a little bit deeper is
also very clear.
Now these are images
and structures that you may see in many ultrasound machines,
but additional imaging allows me to see
the cervical plexus in this image as well.
If I move up a little bit, I see beautiful imaging
of the C four nerve root
and the C3 nerve root shallow to the anterior
and middle scaling,
but deep to the sternal collateral mastoid
and these kind of nerves we weren't able to see
with ultrasounds that aren't at this level of quality.
Moving down, we can also image a beautiful dorsal scapular
nerve root in the middle scaling muscle.
As I move the ultrasound probe cranial
and coddle, you can see the dorsal scapular nerve move
away and towards the brachial plexus.
This type of imaging allows me to have confidence
as I move my needle through the middle scaling muscle
that I can avoid structures I don't want to hit,
but put my needle onto structures that I want
to be very close to and inject my local anesthetic.
Now we've moved to the sono site lx.
The Sono Site LX is your full system ready to do everything
that you'd expect in our world of anesthesia.
For example, you could do transthoracic echo.
You of course could do the nerve blocks
and vascular access with linear transducers,
you have your curvy linear transducer
to do gastric ultrasound or deeper nerve blocks as well.
The LX is also able
to support transesophageal echo if you need
that in your department as well.
So let's look at some gastric ultrasound since
that's something that has increased interest since the
introduction of the diet medications
that slow gastric emptying.
So here I'll change from one transducer the linear
that I was scanning prior to the curvilinear transducer.
Here we have the preset abdomen and I'll select that
and move to the curvilinear transducer.
Also with the LX we're able
to introduce a new technology called voice assist
With voice assist.
You have a microphone on your ultrasound
and instead of pushing buttons on the ultrasound to change
most of the things we want to change,
the parameters are able to be adjusted with just your voice,
even in loud, noisy environments like a hospital bay
in a busy pre-op or postoperative area.
So here it is toggled with a single button voice assist on.
So I'll turn the voice assist on by saying activate voice.
You'll notice on the left side
of the ultrasound image I have all the parameters
that I can change just with my voice first.
Some basic things like reduced depth
and you can see the depth is reduced.
The other thing, it looks a bit dark, so I can say brighter,
brighter, brighter.
And now we can see many of the structures
underneath the stomach.
So to go over some of the structures I see on the screen,
I see my liver On the left side, I can see the
stomach, which appears generally full
with a starry appearance, which is a sign
of generally being recent food ingestion.
So in this patient I would say I'm probably gonna wait
to do anesthesia.
So to go back to voice assist, I'll say activate voice.
Other things I can do, if I want to document this,
I can say freeze.
I can say image
save unfreeze.
If I wanna see some of the vascular structure in the
underneath the stomach, I can turn color on here,
you can see the color.
Now I can say color off.
So now you can see with a very nice voice command, I'm able
to adjust most of the parameters I need
to without having assistant or reaching across the bed.
If I have sterile hands, I can get to everything I need
to just with my voice.
Next I wanna show that you can get great images
with the cardiac transducer and do a transthoracic echo.
So we'll use a low frequency phased away transducer,
two button pushes,
and I'm ready to scan with this transducer.
So voice assist also works with this. So I'll turn this on.
So now I've found a
per sternal long axis image of the heart.
It looks a bit dark to me. I'll say activate voice.
Brighter, brighter, reduce depth.
Now you can see this per sternal long axis
view of the heart.
I'll change the transducer orientation
and I can see a nice short axis view
of the heart reduce depth.
So you can see you can get a great
transthoracic echo very easily with the sono cyte lx.
Now let's move on to a live question
and answer session where I can answer any
questions that you might have.
- All right, thank you so much - Dr. A Young, we have Dr.
A Young here with us as well.
I'll ask him to go ahead and start his video
and we can get to the q and a session now.
So once again, we're currently broadcasting on multiple
platforms, but we can only take questions if you're on our
main zoom broadcast, the q
and a box should be available at the bottom
or the side of your screen to get those in.
And it looks like we do have a few in here already.
Dr I Young, when is the best time
to use a cervical plexus block?
- Oh, thanks Chris.
Yeah, I think cervical plexus block is something
that we don't talk a lot in the world
of regional anesthesia,
but I've really found it useful clinically.
Probably the two places that I use it most are
for awake carotid surgery essentially,
or sleep carotid surgery for postoperative pain.
But if you have a surgeon
that does awake carotid endarterectomies, those,
those really are great.
I can remember one time we had a BMI patient over 40,
had a first year resident, had an inpatient surgeon
and I said, Hey, just give us a second.
We're gonna give you the best, you know, awake
carotid field that you'll ever have.
And she put this in my, my first year resident,
large patient, and the,
the surgeon couldn't stop talking about how good
of a cervical plexus block
and then a result in surgical field she had.
So I think that was one that really hit home
that an ultrasound guided cervical plexus block on top
of anything will be much better than even just a
field block or a landmark guided cervical plexus block.
If you saw that video, essentially the,
the block is putting local anesthetic in that plane
between the sternal cla mastoid
and the scaling muscles that you're used to seeing
with an inner scaling block.
And we drop off about five 10 mils at the
most in that plane.
I do warn you that the, the fascia overlying those
scaling muscles does go around the entire neck.
So if you put large volumes, you have the risk
of doing a bilateral phrenic nerve paralysis.
So keep your volumes low.
Those are small nerves they block easily with five mils,
not, definitely not more than 10 for
that cervical plexus block.
The other place I use cervical plexus blocks I think is a
great place, is clavicle fractures.
You know, I think when you look at clavicle innervation,
people have all kinds of debates whether you do
different blocks where the clavicle is fractured.
For me, in you, you know, I live in Seattle,
we have all kinds of people falling off bikes,
breaking their clavicles.
For me it's really hard to say, oh,
this person specifically clavicle vac
switches from one nerve to the ano.
Another here for me,
I pretty much always do a cervical plexus block
for most clavicle fractures
and then add in a inner scaling block
and I do catheters on the inner scaling level
and then a single shot cervical plexus for most.
So again,
those are the two places I use cervical plexus blocks mainly
for awake carotid surgeries and then clavicle fractures.
- Excellent. All right.
Looks like the next question is,
is gastric ultrasound clinically useful
to make a call on NPO status and will it hold up legally?
- That's a very interesting question, Chris.
I think most of us know gastric ultrasound.
It, it hasn't been around that long.
You know, pretty much every conference you go
to people are learning and teaching about POCUS
and all kinds of different ways.
We are learning to image as anesthesiologists
and in other fields as well.
But specifically for us, you know,
there becomes a a great legal risk of aspiration
and should we be proceeding on any case?
And now that we have the GLP one diabetic
and diet type medications used more
and more we get to a point where we go,
should we be imaging essentially almost everybody on
these medications?
I think I, I hold in most regard the statement put out
by A A SA about almost a year ago,
I think it was mid-year 2023, where they suggest
how you should hold the GLP one medications
for at least a week.
And if not,
or any, any issues then consider,
I think they consider if you have the expertise using
gastric ultrasound.
So I think that is something that, you know,
as it was worded because it is a SA
that it's not a strong statement saying we all should use
it, but those of us that have some expertise in it,
it it can be used to assess gastric volume.
And I think there's more and more papers out coming out
to say it is something both just in a supine position
or if you're able to turn your patient lateral,
that you are able to make assessments
with some experience about the gastric volume
and whether somebody has a stomach full
of any kind of content.
So I do find it something
that I have been leaning on more.
I have found patients with residual gastric volumes
and I've found patients
that I'm worried about that are empty.
Does it change my clinical practice a few times?
It actually has.
I think it can definitely, if it's empty, you go, boy,
that really decreases my anxiety about getting this patient
off to sleep and putting a breathing tube in.
Generally I still err on putting a breathing tube in if they
don't say meet gastric or NPO status
or if they are on these kind of new medications
that slow gastric emptying,
but at least I'm not as anxious putting
that breathing tube in.
Most of the time though, if there is any concern about full
stomach, I'm still doing a rapid sequence induction.
Although I, I, I find it nice to know
that I don't see anything in the stomach at that time.
Like I tell most of my trainees,
if you are just scanning those patients,
you're concerned about whether they are on these medications
or on obese
or coming in for trauma, I,
I find it not something
that is easy in every patient scanning
for gastric volume.
So it's something that we should be doing like say first
case of the day when maybe you show up a little bit early
and have some time to scan that first patient just
to get used to identifying that stomach
and assessing that gastric volume.
Look at some normal patients
before you're called upon
to figure out a questionable patient.
- Excellent. All right, looks like our next question is when
of you found a TTE useful in clinical practice?
- Well if, if you don't know me,
I'm not a cardiac anesthesiologist so you know, my,
my knowledge of say TEE at baseline is you know,
at pretty much a resident level
and residency was just a few years ago.
A you know me, so reaching
for a transthoracic probe is something that I have been,
you know, exploring since I was a resident
because obviously I've been very interested in ultrasound
but it's not something I use daily, weekly,
or I would say even monthly going to transthoracic echo.
But when I do need it, I have found things like effusions,
decreased function
and probably most commonly is decreased volume status.
So when I find that
a tachycardic hypotensive patient, I think
that is usually when it is the most useful to say,
should I just start pressors inotropes or give more volume?
And I think that is probably as strong
as the clinical decisions I make with the transthoracic
transthoracic echo.
Something else that I find it may not be as optimal
as when you see people teaching it.
When you see people teaching it like just came back from a
national conference and they had the patient
and they're returning the patient on the side,
you know when you have a patient hypotensive in the recovery
room or even intraoperatively, we can't always position
that patient perfectly to get the perfect views,
but I really find that even just standard views
that like a parasternal long
and short axis, pretty much what I showed just a bit ago,
we can find a lot of those questions like if someone
has an effusion, if they have low volume hypo hypovolemia
or just decreased function.
So some of those basic questions I have found useful
and I typically use a transthoracic echo
probably once a month
or slightly less when I reach for that transthoracic echo
outside of teaching just
to actually answer a clinical question.
- Alright, next question is why not just do a rectus
sheath block instead of a tap block?
- Yeah, I find a lot of abdominal blocks, there are a lot
of choices these days
and when you're looking at which one you want to do,
if you wanna find I think the easiest block
to do multi-level coverage with a single injection,
I really think that tiche like the whoever asked
that question, I think is a beautiful block to do
for multi-level coverage and simplicity.
I often find that rectus sheath is slightly
shallower if you saw that rectus abdominis muscle.
If you don't know the rectus sheath block,
it's just an injection generally on the lateral part
of the deep fascia essentially
underneath the muscle without piercing that fascia
and injecting the slight lateral edge of that
and putting in some volume.
And what we have found, not just me but papers
and research have found
that it does provide multi-level coverage
'cause it can spread cephalad caught at with a decent volume
of say 20 mils.
And so I think the rectus sheath,
if you have a midline incision ends up a nice block,
especially if you have the upper abdominal incisions
because those upper abdominal incisions are quite difficult
with the tap block 'cause you have
to be right along the rib cage so
that rectus sheath block becomes a really nice block
where it is not useful is anything not midline
because you start to get more lateral cutaneous nerves
that come off those intercostal nerves more laterally.
And so if you're only injecting erectus sheath block,
you have a risk of missing those lateral cutaneous nerves.
So that's where a tap block may be preferred.
I think a tap block, they've both been around a while,
but I think if you're looking at ultrasound blocks,
I think the tap block was one of the earlier blocks
to be introduced and so that where, that's
where it got it's popularity.
Although the rec toif block, I think more
and more people are gravitating back towards that.
It was a block described even without ultrasound.
And if you do have that midline incision,
that rectus sheet block is a nice block
to have in your armamentarium.
- All right, moving a little bit upwards.
The next question is,
I'm interested in the dorsal scapular nerve.
Is there any benefit to just blocking that nerve alone?
- Oh that's a, that's a good question.
I mean, me and my, one of my fellows,
boy it's almost been a decade ago, wrote up a case report
of doing a block on the dorsal scapular nerve
for a patient with scapular surgery.
This patient had a scapular surgery where they detached some
of the muscles and reattached
for a scapular type pathology.
And so we've also done it for scapular fractures,
which are pretty rare, at least in my hospital.
We're not a huge trauma center
but we've done blocks for scapular fractures as well.
And I think one of the, if you read the case report
that I wrote, it is something that we figured out
provided a decent amount of analgesia
'cause we weren't sure at the time whether dorsal
scapular block would cover this.
So we just did a single shot block.
This was a young woman
and she did great for you know, roughly
that single shot duration somewhere between 12 and 18 hours.
And then we came and saw her the next day
and she's like, oh it's really hurting now.
Can you repeat the block?
So we repeated the block,
put in a continuous nerve block just on
that dorsal scapular nerve, hooked it up to an infusion, ran
that infusion I believe about four mils an hour
of 0.2 ropivacaine and sent that patient home.
She did great at home with that infusion.
So I think
because we did that single shot block, it wore off,
she got pain again, we replaced it with great effect
with a continuous infusion.
That was a good, good evidence for me that
that dorsal scapular provides a significant amount
of innervation to that scap scapula.
So if you do have any kind of scapular pathology,
you can target that dorsal scapular nerve within
that middle scaling muscle
and really spare a lot of the rest of the brachial plexus
so the patient doesn't have hand arm weakness during
that recovery period.
- Alright, next question that came in is
how do you cover the upper T six to T eight levels?
- How do I cover the upper T six to T eight levels?
My favorite block
for upper thoracic surgery right now is the ESP block.
I think if you look at
in a training program
where I'm not holding the needle all the time,
I think the ESP block gives a nice, we can do this block
and pretty much everyone, no matter what their BMI,
I can do it with trainees and I can do it quickly.
So I mean those kind of three main
qualities of the ESP block are what I really like
about the ESP block.
Now I've done a lot of blocks in my life,
so if I'm holding the needle
and let's say you have a T seven eight rib fractures,
I actually go a little bit deeper
and try to get down to the pair
of vertebral level in my hands.
Now if you look at the ESP evidence,
and this could be a whole lecture,
maybe we'll have another webinar on that,
but doing a slightly deeper than a classic ESP block,
we call it an inter transfer process block.
I think there's more and more evidence suggesting
by going a little bit deeper we cover those nerves
and get a little better analgesia
by going slightly deeper than just a posterior,
or sorry, just the anterior fascia
of the erector spina plane muscle.
So if you can imagine your transverse processes
and your erector spina muscle, if you know,
I think the classic was just
to inject either right on the transverse process.
I think more and more evidence suggests both in cadavers
and a few in in actual patients suggest going a little bit
deeper and getting
between those transverse processes you get a little bit
deeper perhaps through some additional fasas
and ligaments and we can then get a little better effect.
So that, that was a long-winded answer.
I think day to day I typically do ESP blocks maybe slightly
deeper than a ES classic ESP and go into transverse process
and then if I have a very specific rib that I need
to block, then I'm going
and trying to get down to the paravertebral level.
- Alright. And kind of staying up there,
what is your go-to block for shoulder surgery?
Do you usually use inner scaling superior trunk
or supraclavicular supraclavicular or something else?
- Something else? Great. That's actually where the majority
of my research has been in the last few years.
And so I think what the, the question's great
because essentially
what the research has shown is you can do any
of those from a analgesic standpoint.
You can pretty much do any inner scaling superior trunk
supraclavicular and that's for anesthesia.
You could pretty much do any of those for anesthesia,
for analgesia you can even add in a
a selective anterior suprascapular block
and that will essentially create non-inferior analgesia
across the entire spectrum of the brachial plexus.
All those blocks that I just mentioned.
So essentially in summary for analgesia,
you can pretty much do any block
above the clavicle if you position your needle right
and get the same quality of pain relief
after either rotator cuff surgery
or shoulder replacement.
So definitely smaller surgeries
and that should create the same kind
of block.
So, so what is my go-to
because you know the other part
of this is always phrenic paralysis
and your ability to decrease phrenic paralysis.
We essentially are getting away more
and more from inner scaling blocks
and just drifting down a little bit, getting down to
that superior trunk instead
of the three circles drifting down to
where those circles become a kind of oval,
more horizontal oval And that is kind of the superior trunk.
That same basic anatomy holds true.
If you get down to the supraclavicular level, you don't have
to go in that corner pocket
that's been traditionally described at the supraclavicular
level between the artery and the rib.
You can still inject that superior trunk
that lays up high along the nerves.
So just a s portion of that
supraclavicular nerve level.
And if you target that superior area even more on the
lateral side, you're gonna be closer
to the shoulder innervation.
So you can save even more phrenic paralysis
by going slightly lateral
and high on the supraclavicular level.
And that is another one of my go-to areas
for shoulder surgery.
I really try to get down lower
and definitely not do an inner scaling block when I start
getting to BMI over 35
and definitely over 40 I'm getting down
to a supra clavicular block more often.
And if you have that smaller transducer,
the vascular
or the 25 millimeter transducer, I like to get down
and even do selective anterior suprascapular nerve blocks
targeting that suprascapular nerve.
And that has been shown to save the most lung function,
especially when you get down to lower volumes like five 10
and definitely 15 mils at the most targeting that.
So I think the research in the last five
to 10 years really has shown we don't need
to do inner scaling blocks as a standard
for most shoulder surgeries.
And the lower we go on the brachial plexus,
the better we save lung function.
- Excellent. Alright,
next question is if we need more x perl volume,
have you diluted more than company recommendations
- If you need more X perl volume?
I I, our hospital does not carry xprl
but I think from a dilute standpoint I think you would be
fine diluting if you're trying to get more volume.
I think I would dilute, I think the recommendations are
with bupivocaine only, so dilute your local anesthetic
with BUPIVOCAINE only
and I think creating that more dilute volume,
whether you're using EXPAREL or
or any other local anesthetic, a lot
of our plane blocks we're trying to create a larger volume
to create more spread
and I guess I could talk about that too And,
and one of my tips for plane blocks, whether it's tap blocks
or ESP blocks,
is I generally don't just put my local anesthetic in one
place and this probably even is more important for xprl
'cause it doesn't seem to traverse tissue quite as well.
So don't be afraid to move your needle while you inject.
I think in plain blocks those vascular areas are
smaller or the vascular arteries are smaller.
So I think you have less chance of pun puncturing
and injecting into them.
So I do advance
and inject if you're worried about that,
you could consider inject advancing your needle first
and injecting on the way back.
But I think a lot of just plain
plane blocks are generally taught
as put your needle one spot and inject.
But I think one technique that I use to really increase
where that local anesthetic goes is not rely on simple
diffusion of any local anesthetic but use your needle
and move it so I don't just inject one spot on the tap
plane, I don't inject one spot on ESP, go ahead
and move your needle
and try to to spread that local anesthetic
around more so that that time
that local anesthetic is working doesn't have
to wait for diffusion.
And there's a great MRI study
that showed diffusion takes up to six hours.
So if your local anesthetic less 24 hours
or less, then you definitely don't want to wait six hours
for it to reach peak spread.
- Right. It looks like we don't have any more
questions coming in.
Let's see. Yeah, looks like we've gotten
through all of those.
So Dr. A young, thank you so much for joining us today.
We really appreciate your presentation
and you sticking around for the q and a.
Really great information here.
Thank everybody else for joining us
for this webinar as well.
We'll be announcing some more webinars soon,
so keep an eye on sono site.com/behind the scan webinar
for more details on those.
Dr. Ayung, we really appreciate you sharing your expertise
with everybody today and thank you so much for joining us.
- Thank you Chris, and thanks for everyone that joined us.
- Thanks. We'll see you at the next webinar.
Watch David Auyong, MD as he demonstrates the new Sonosite Voice Assist application for hands-free system control using Sonosite LX. He also shows how Sonosite ST offers amazing image clarity to perform procedures such as Ultrasound-Guided TAP and interscalene blocks. In addition, see how gastric content can be clearly seen when properly scanning a patient's stomach prior to surgery with Sonosite ST.
What You'll Learn
- Voice Assist hands-free system control, reducing the need to reach over the bedside to push buttons
- Sonosite ST ease-of-use and imaging capabilities
- TAP block and brachial plexus sonographic anatomy
- Gastric imaging on a patient with a full stomach
Dr. Auyong's research focuses on improving patient outcomes with regional anesthesia. He has co-authored a popular textbook, Ultrasound Guided Regional Anesthesia, now in its second edition. Aside from his academic work, Dr. Auyong is often recognized by his Fujifilm Sonosite videos on YouTube describing ultrasound guided regional anesthesia approaches to many different nerve blocks.
This educational webinar is intended for healthcare professionals and not for patients or consumers. The material is provided for general educational purposes, as a reference and a supplement to professional experience, education and training, and should not be considered the exclusive source for this type of information. This educational webinar is not intended to recommend any device for a particular indication or to provide indications for use for any device. At all times, it is the professional responsibility of the practitioner to exercise independent clinical judgment in each particular situation. Fujifilm assumes no responsibility or liability for any misuse of the information imparted in this webinar. This educational webinar does not supplement, replace, or supersede device labeling, including instructions for use, which accompanies any FUJIFILM Sonosite product.