Learn how to identify ascites using bedside ultrasound, using the Dr Sono Ultrasound
In this educational video, we explore the ultrasound examination of ascites, focusing on how to use a point-of-care ultrasound (POCUS) scanner to identify free fluid within the abdominal cavity. This practical guide is designed for medical students, intensive care doctors, A&E (Emergency Medicine) doctors, ultrasonographers, and nursing students who want to develop their understanding of ascites, its pathophysiology, and its assessment using ultrasound.
We demonstrate the key anatomical areas to examine when looking for free fluid, including the spaces around the liver and kidneys, as well as the pelvis. You will learn how to position the ultrasound probe, obtain useful abdominal views, recognise the sonographic appearance of free fluid, and understand how these findings can contribute to clinical assessment.
What you will learn Understanding ascites: What ascites is, how it develops, and the underlying pathophysiology. The causes of ascites: An introduction to conditions associated with fluid accumulation, including liver cirrhosis, portal hypertension, malignancy, and other medical conditions. Ultrasound probe positioning: How to approach the abdominal examination using a point-of-care ultrasound scanner. The right upper quadrant: How to assess the area around the liver and hepatorenal recess (Morison's pouch) for free fluid. The left upper quadrant: How to examine the area around the spleen and left kidney. The pelvis: How to identify free fluid in the dependent pelvic spaces. Recognising ascites on ultrasound: Understanding the appearance and distribution of free fluid within the peritoneal cavity. Clinical application: How bedside ultrasound can support the assessment of patients with suspected ascites and help guide further investigation and management. Who should watch this video?
This tutorial is particularly useful for:
Medical students learning abdominal examination and clinical ultrasound. Intensive care and critical care doctors assessing acutely unwell patients. A&E and emergency medicine doctors using POCUS in clinical practice. Sonographers developing their knowledge of abdominal ultrasound. Nursing students and healthcare professionals interested in bedside ultrasound and fluid assessment. Why is ultrasound useful for assessing ascites?
Ultrasound is a rapid, non-invasive bedside imaging technique that can help identify free fluid within the peritoneal cavity. It can be particularly valuable when physical examination findings are subtle or uncertain. Understanding where fluid accumulates and how to examine the abdomen systematically can improve your confidence in recognising ascites and interpreting ultrasound findings in their clinical context.
Important: This video is intended for educational purposes and does not replace supervised practical training, formal ultrasound education, or clinical judgement. Ultrasound findings should always be interpreted alongside the patient's history, examination, and other investigations.
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Keywords
Ascites, ascites ultrasound, point-of-care ultrasound, POCUS, bedside ultrasound, abdominal ultrasound, free fluid, Morison's pouch, hepatorenal recess, pelvic free fluid, abdominal examination, ultrasound for medical students, emergency medicine ultrasound, intensive care ultrasound, critical care, sonography, ultrasonography, nursing education, liver disease, portal hypertension.
This video demonstrates the use of point-of-care ultrasound (POCUS) to rapidly identify ascites in patients presenting with acute abdominal swelling. It covers the clinical rationale for using ultrasound over blood tests for immediate diagnosis, the technical setup of the equipment, the specific anatomical areas to scan, and how to differentiate free fluid from other abdominal structures.
Hello and welcome back to the channel.
Here's John, myself and Dr James Gill for another
clinical skills video.
Today we're going to be doing point of care ultrasound whereby we're
looking at a patient with ascites.
So ascites is one of these very important signs that we need to
be able to identify rapidly.
Bearing in mind if we're dealing with a patient who's coming in with acute
abdominal swelling, they're perhaps having issues with nausea,
vomiting, or pain, and we're
considering there might be reasons to believe this is ascites,
it is going to take some time for a
liver function test to come back.
Conversely, the ability to do a point-of-care ultrasound
and identify that free fluid in the abdomen
is going to be very useful in terms of planning out
what is likely going to be the management plan for that patient.
So with regard to that, obviously
Do we want to introduce ourselves to the patient?
Hello, my name's Dr Gill.
I've been asked to do an ultrasound of your abdomen,
your stomach area today.
Before we go further, can I please confirm your name and date of birth?
Yes, Dr Bethany Gill, and my date of birth is 10th August 1995.
Fantastic, thank you.
So, I'm aware that there's some concern about fluid in your abdomen.
Have you had an ultrasound before?
Not recently.
Okay, so you're familiar with the nature
of going to be putting some jelly on your stomach.
Can I clarify it?
It's very unlikely, but we always want
to make sure with regard to the jelly.
Do you have any allergies at all?
No.
Fantastic, thank you.
So if I can get you to start, please, by lifting up your shirt.
I'm going to need to get to this area
of the skin just at the top of your ribs, thank you.
So in terms of starting off with the ultrasound,
obviously I've gel cleaned my hands beforehand.
We're going to get the ultrasonic jelly,
which will allow us to send the sound
into and also receive the sound of the probe.
So here we're going to be using the curvilinear transducer probe,
and crucially I'm going to actually be turning the unit around
so that I've got the nub faced toward the patient's head,
and that way I will be able to correlate
that with the left side of the screen
pointed towards the patient's head
and that'll help me orientate myself which is unfortunately
not warmed in this case the screen is set to record
and is using the abdominal setting
i'm looking at the nub on the ultrasound probe
and that is corresponding to the left side of
the screen so in this case i'm going to turn the probe around
so the probe is headed towards the
patient's head and I know that the left side
of the screen will therefore correspond with the
patient's head. I'm just going to make a small touch
on that to confirm exactly where we
are. Now in terms of the first part
of the examination we're going to be looking between
the seventh and the tenth intercostal spaces
and we're going to be looking through the ribcage
at the liver so with ascites we are dealing
with a free fluid within the abdomen as such we're
looking for sharp clearly demarcated blackness
because the fluid is anechoic by comparison if
we're looking at fluid and things within the bowel
then that's going to be um bordered and
will likely be much blunter by comparison similarly
because we're looking at fluid it's
going to move within the abdominal cavity
and will move downwards as the patient is lying
we're going to expect it to collect in certain areas
so for example we're looking to see if
there is fluid in the potential space within
the liver called Morrison's pouch if we can see
evidence of fluid around the kidneys
and if we can see anything in the paracolic gutters on the left
and right side of the abdomen
so it's starting off the patient is positioned in a position that
lying flat and we've got their right arm up behind the head
so i can get to this side so i'm just
going to apply the probe now if that's okay
so coming in to the side and straight away on the
screen we've come in and we can see the echo texture
and the vein the vessels and ducts of
the liver there we go
so we can see that what should normally be a flat line has been filled
with black fluid but that's different from the spaces
that I can trace up and down we're looking
at the bile ducts I'm going to move a little bit lower
and I'm going to try and find the the kidney
instead of getting a little bit more ultrasound
jelly I wasn't quite generous enough to start
off with and we're looking down at the side
and I'm trying to find the kidney
again so we can see the kidney
on the screen we can see that there is a
darkness around it which is not unusual
so we know that there is the ascetic
fluid within the abdomen here
and then I'm going to come down I'm just going to move
your trousers ever so slightly
and just changing the direction of the probe here
So I've rotated around, and now the probe is facing towards me,
so the dot on the screen is with the right side of the patient.
I'm looking around, I'm checking in the paracolic gutters,
can I see any loops of bowel, and crucially,
can I see that free fluid within the abdomen?
We can also move over and check the same side.
Again, can I see this very clearly demarcated darkness
in keeping with the free fluid?
If we wish to, we can actually come across suprapubically
to view the bladder,
which we can see there as a dark horizontal shape.
So we can see there how that is demarcated.
This dark horizontal shape is boundaried,
as we're expecting with the bladder,
which is not the case
when we've seen that free fluid within the abdomen.
We can also, if needed, have a look around the liver.
Now, throughout this, we're looking for darkness which is not there.
So keeping in mind that the intestines
and things are sat within the abdominal cavity
and we've not got any extra space particularly around them.
So ascites shows up very clearly on the ultrasound.
In this case, we could see a small amount of fluid.
And then when we've identified ascites,
we need to ask the question, why?
So is it an exudate,
indicating that there's protein within the abdominal cavity?
Or are we dealing with a transudate, where actually there's less
protein in the abdomen in terms of it being pushed through?
That will tell us an awful lot about the pathological processes.
Now, in this particular case,
I have got consent to film, I've confirmed this,
the ascites that we're dealing with here today
is by definition transudative because it's actually
a consequence of a surgical procedure where free fluid has
been left in the abdomen which is
entirely safe and this will resolve without complication
and that's one of the reasons
we've been able to film this today
so hopefully this has been a useful video for yourselves
looking at point of care ultrasound with regard
to ascites if you've got any questions please put
them in the comments and see what we can
do to help. Take care and we'll see you in the next one, cheerio