Chapter 22: Abdomen

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Welcome to the Deep Dive.

If you're listening to this right now, there is a very good chance that you are a nursing student.

Oh, almost certainly.

Yeah, you might be commuting to your clinicals right now, or maybe you're sitting at your desk just cramming for a massive health assessment exam.

Well, you are exactly who we designed this for.

Today, we are looking at a huge stack of sources we've compiled just for you.

Right.

We've got the latest clinical practice guidelines, a bunch of our own bedside nursing notes, and really at the center of it all is Chapter 22 on the abdomen from the ninth edition of your physical examination and health assessment textbook.

Which is a beast of a chapter, honestly.

It is.

But consider this your personal one -on -one tutoring session.

You know, our mission today is to take that dense stack of textbook pages and turn it into actionable clinical knowledge.

We really want you to master the abdominal assessment from the exact moment you walk into the patient's room all the way to the moment you chart your findings.

We're going to follow the exact logical flow of the chapter.

So we'll start with the foundational anatomy, then move into how to effectively interview your patient,

transition into the actual physical exam techniques,

and wrap up with clinical reasoning.

By the end of this deep dive, you won't just be memorizing steps.

You will understand the why behind them, which is exactly what guarantees safe evidence -based patient care.

Okay, let's unpack this, starting with the foundation, the anatomy.

But instead of just memorizing a map like its middle school geography, we really need to think about how these structures actually behave in a living, breathing patient.

So the abdomen is this massive oval cavity, and it stretches from the diaphragm all the way down to the brim of the pelvis.

And it's protected by four layers of large, flat muscles like the rectus abdominis running right down the midline.

But the insight here isn't just knowing the muscles, it's knowing what's hiding underneath them.

Exactly.

Visualizing the organs under the skin is the absolute first step to clinical interpretation.

In our notes, we categorize the internal organs, the viscera, into two distinct types, solid and hollow.

And this distinction is incredibly important when you start palpating.

Solid viscera maintain a characteristic shape.

So think of the liver, the pancreas, the spleen, the kidneys, the ovaries, and the uterus.

They're like dense sponges.

They have a permanent form.

Yeah, whereas the hollow viscera, on the other hand, are kind of shapeshifters.

Precisely.

The stomach, gallbladder, small intestine, colon, and bladder, they change their shape depending on what's inside them.

And the clinical pearl here that will save you so much panic at the bedside is that you usually cannot feel hollow organs unless they are really angry or distended like a bladder that is just completely full of urine or a colon backed up with feces they are meant to be hiding.

That's a great point.

Now to make sense of this territory, we divide the abdomen into four quadrants with an imaginary vertical and horizontal line intersecting right at the umbilicus.

The classic crosshairs.

Right.

We all know the right upper quadrant, the RuQ, is prime liver and gallbladder territory.

But it also holds the duodenum, the head of the pancreas, and the right kidney.

Moving over to the left upper quadrant, the LuQ, you find the stomach, the spleen, the left lobe of the liver, the body, the pancreas, and the left kidney.

And then dropping down to the right lower quadrant, the RLQ.

This is your danger zone for the cecum and the appendix along with the right ovary, tube, and ureter.

Yep.

And finally, the left lower quadrant, the LuQ, which houses the descending and sigmoid colon and the left ovary, tube, and ureter.

Down the midline, you've got the aorta.

But remember, this map isn't static.

It shifts wildly depending on the patient's stage of life.

Right.

Let's talk about those developmental variations because a pregnant patient's abdomen is a completely different landscape than a toddler's.

In infants, the umbilical cord is super prominent.

It has two arteries and one vein.

And their liver takes up a huge amount of space, proportionally.

Even their urinary bladder sits higher up than it does in adults.

And then pregnancy brings massive systemic changes.

You aren't just dealing with an expanding uterus that physically shoves the intestines upward and to the back, which, by the way, naturally diminishes bowel sounds.

Yeah, they get completely squished.

Exactly.

You are also dealing with hormonal cascades.

Human chorionic gonadotropin, or HCG, triggers the classic nausea and vomiting of morning sickness.

Progesterone relaxes muscle, which decreases GI motility.

Which means gastric emptying is prolonged.

Right.

More water gets resorbed from the colon, and the patient ends up with severe constipation.

They also frequently suffer from pyrosis heartburn because of esophageal reflux.

Then we look at the aging adult.

We know fat tends to migrate away from the face and limbs and settles right into the abdomen.

But the functional changes are what really impact our nursing care.

Salivation decreases.

Gastric acid secretion drops, which can cause pernicious anemia.

But the most critical one is the liver.

Between the ages of 20 and 70, liver size actually decreases by 25%.

And what's fascinating here is how that physical shrinkage impacts pharmacology.

Decreased liver size means decreased blood flow through the liver, which heavily impairs drug metabolism.

So the meds just sit there.

Exactly.

If you have an older adult taking a medication metabolized by the liver, like it stays in their system much longer.

That prolonged metabolism leads to increased side effects, which is exactly why older adults on these meds have a dramatically higher risk of falling and fracturing a hip.

That is such a vital connection to make for patient safety.

The textbook also tackles a massive myth about the aging adult, which is constipation.

It seems like every older patient reports it, but the evidence makes it clear constipation is not a normal physiological consequence of just getting older.

It is not.

We use the ROM3 criteria to define true functional constipation.

We're looking for fewer than three bowel movements a week, straining, or hard stool.

But the root cause is an age itself.

It's usually decreased physical activity, inadequate water intake, a low -vibrate diet, or the side effects of medications.

We also have to look at genetics.

Lactose intolerance is a perfect example of this.

A deficiency in the lactase enzyme means the patient can't absorb milk sugar, leading to bloating, pain, and flatulence.

But the prevalence is entirely tied to genetic heritage.

Right.

It affects nearly 80 % of Native American persons,

75 % of black persons, over 50 % of Hispanic or Latino persons, but only about 20 % of white persons.

And why should you care about this?

Because if your patient avoids dairy, they are missing out on essential nutrients like calcium and vitamin B12.

You have to factor that into their nutritional assessment.

Which is the perfect reason why we talk to our patients before we ever touch their abdomen.

The subjective interview dictates your entire physical exam.

If you don't know about their genetics, their habits, or their baseline, your hands simply won't know what to look for.

You are systematically going to ask about nine key areas.

Let's list those out.

Sure.

Appetite, looking for anorexia or sudden weight loss.

Dystagia or difficulty swallowing.

Food intolerance, like a lactose issue or pyrosis.

Abdominal pain.

Nausea and vomiting.

Bowel habits.

Past abdominal history.

Medications.

And a nutritional assessment.

Let's do a deep dive on pain specifically.

When you're standing at the bedside and your patient is grimacing, you might panic.

But you have a tool.

The PQRSTU assessment.

Provocative or palliative.

Quality, region or radiation.

Severity, timing and understanding the patient's perception.

You have to ask the right questions because the timing of the pain practically hands you the diagnosis.

It really does.

Let's look at ulcers.

Chronic pain from a gastric ulcer typically flares up when the stomach is empty.

But the pain of a duodenal ulcer is completely different.

It usually hits two to three hours after a meal and is actually relieved by eating more food.

That's a huge distinction.

Yes.

But while chronic pain is a puzzle, acute pain is an alarm bell.

If a patient reports sudden, severe pain that came out of nowhere, you need to be on high alert for emergencies like appendicitis, colicistitis, a bowel obstruction or a perforated organ.

You also have to ask about their bowel habits.

I know asking detailed questions about a stranger stool isn't exactly why you went to nursing school, but it is a gold mine of data.

Stool color is a massive clue.

Blacked, tarry stools called melena point to upper GI bleeding.

But if the stool is black and non -tarry, they might just be taking iron supplements.

Right.

Bright red blood usually means lower GI bleeding or something localized like hemorrhoids.

And gray stool, that's a classic sign of hepatitis.

You'll also use tools like a 24 -hour dietary recall.

And don't forget the reality of their environment.

Asking someone to eat more fresh vegetables doesn't work if they live in an inner city food desert with zero access to fresh produce.

Once you have gathered that robust subjective history, you transition to the objective physical exam.

But you don't just walk up and start pressing.

Preparation is everything.

The abdominal musculature will fight you if the patient is uncomfortable.

Make sure the room is warm.

Have them empty their bladder first.

Nobody wants their full bladder palpated.

Position them supine, head on a pillow with their knees bent.

Bending the knees is the secret hack to relaxing the abdominal wall.

First up in the abdomen at eye level.

Is it flat?

Is it scaphoid, meaning sunken in?

Is it rounded or is it protuberant, which screams distension?

You're scanning for symmetry, making sure there are no localized bulges, masses or hernias.

Sometimes you even ask the patient to take a deep breath or do a mini sit -up.

That increased pressure will make hidden hernias pop out.

You also inspect the umbilicus.

Keep an eye out for the Sister Mary Joseph nodule.

It's a hard nodule in the umbilicus occurs with metastatic cancer of the stomach, intestine, ovary or pancreas.

And do not ignore the patient's demeanor.

Their behavior is speaking volumes before you even touch them.

If you walk in and the patient is absolutely still, rigid and resisting the slightest movement that points to the excruciating widespread pain of peritonitis, any movement rubs the inflamed lining.

Just a completely board -like stiffness.

Yes.

Conversely, if the patient is restless, constantly turning and shifting, trying to find a comfortable position that points to the colicky, cramping pain of gastroenteritis or bowel obstruction.

Also, watch the surface of the abdomen.

A slight aortic pulsation in the epigastric area is normal in thin folks, but a marked vigorous pulsation with a widened pulse pressure.

That's a red flag for an aortic aneurysm.

And marked visible peristalsis, seeing the actual ripples of the intestines combined with distension usually means an intestinal obstruction.

Here's where it gets really interesting.

You've inspected the abdomen.

Normally the physical exam sequence is inspect, palpate, percuss, auscultate.

But in the abdomen, we break the rules.

Oscillation comes second.

It's inspect, auscultate, then percuss and palpate.

Why?

Because if you start pressing and thumping on the abdomen, you are going to artificially stimulate the bowels.

You'll create sounds that naturally aren't there and your interpretation will be completely wrong.

Precisely.

You want to listen to the baseline.

Use the diaphragm of your stethoscope because bowel sounds are naturally high pitched.

Start in the right lower quadrant, right at the ileocecal valve area, because bowel sounds are almost always present there normally.

You are listening for character and frequency.

Are they normal?

Right.

Are they hypoactive, maybe after surgery?

Or are they hyperactive, those loud rushing gurgling sounds we call borborygmy?

We've all had our stomach loudly rumble in a quiet room.

That's borborygmy.

And looking at the textbook notes, there is a massive bolded safety alert regarding auscultation.

We have to cover this.

We absolutely do.

Yeah.

Historically, nurses were taught to inject a little air into a feeding tube and listen with a stethoscope over the stomach to confirm the tube was in the right place.

The updated evidence is clear.

Never, ever use auscultation to confirm feeding tube placement.

Never.

The sound can transmit perfectly falsely, reassuring you the tube is in the stomach when it's actually sitting in the patient's lung.

Administering feeding formula into a lung is often fatal.

Always, always use evidence -based protocols like x -ray confirmation.

Also, while you are auscultating, use the bell of your stethoscope to listen for vascular brutes swooshing sounds of turbulent blood flow over the aorta, renal, iliac, and femoral arteries.

All right.

After auscultation comes percussion, you tap all four quadrants to assess the relative density of the contents.

Because air rises to the surface when the patient is lying supine, you should hear a dominance of general timpani, a hollow, drum -like sound.

If you hear a dull thud, you are percussing over something solid, maybe a distended bladder, adipose tissue, fluid, a mass, or feces.

But let's talk about a major shift in how nursing is taught today.

This is a huge evidence -based update.

Older textbooks spent pages teaching nurses how to percuss the exact borders of the liver to measure its span, or percussing the spleen to check for enlargement.

Chapter 22 explicitly states we are now omitting those traditional percussion techniques.

Wow, just completely skipping them.

Yes.

The research proves they are highly unreliable.

Percussing the liver span often vastly underestimates its true size, and the results vary wildly from nurse to nurse.

It's the same for splenic dullness and bladder volume.

Instead of tapping, we now rely on palpation, and more importantly, bedside ultrasound.

You will, however, still perform indirect fist percussion on the back at the twelfth rig over the costo -vertebral angle.

Right.

A gentle thud shouldn't hurt.

If it causes sharp pain, you are looking at kidney inflammation, like pylonephritis.

Now we get to palpation.

This is where your hands do the talking.

The goal is to judge the size, location, and consistency of the organs and find any masses or tenderness.

But people instinctively tense up when you touch their belly.

You have to be strategic.

Keep your hands low and parallel to the skin.

Warm your hands up.

Use distraction.

Ask them about their pets or their kids.

Because you need to know the difference between a patient who is just ticklish and a patient with a life -threatening acute abdomen.

That distinction is the core of clinical judgment here.

I used to think any resistance meant trouble.

But there is a difference between voluntary guarding and

involuntary rigidity.

Voluntary guarding happens when the patient is cold, anxious, or ticklish.

It's usually bilateral.

And if you have the patient take a deep breath and exhale, you will feel those muscles relax as they breathe out.

But involuntary rigidity is completely different.

It is a constant board -like hardness of the abdominal muscles.

It is a physiological protective mechanism, accommodating acute inflammation to the peritoneum.

No matter how much they exhale or how distracted they are, that muscle will not relax.

You start with light palpation, just pressing down about one centimeter.

You aren't hunting for organs yet.

You are just getting an overall impression of the skin surface and superficial musculature.

Then you progress to deep palpation, pushing down five to eight centimeters.

If the patient has a very large or obese abdomen,

use the bimanual technique.

Put one hand on top of the other.

The top hand does the pushing, while the bottom hand just relaxes and feels.

When you go deep, let's talk about what you're actually feeling for.

In the RUQ, you want to palpate the liver.

You can use the hooking technique, standing at their shoulder and hooking your fingers under the right rib cage, or just push deeply under the right costal margin.

Have the patient take a deep breath.

And that breath pushes the diaphragm down.

Which shoves the liver down into your waiting fingers.

It is totally normal to feel the firm, regular ridge of the liver bump your fingertips.

Over in the LUQ, you check for the spleen.

But here's the rule you normally cannot feel the spleen.

For it to be palpable, it has to be massively inflamed three times its normal size.

If you do feel it, do not keep aggressively pushing on it.

An enlarged spleen is friable and can easily rupture.

What about the kidneys and the aorta?

I know those are deeper structures.

They are.

The left kidney sits higher up and is rarely palpable.

The right kidney sits a bit lower and you might feel its lower pole as a smooth, round mass.

For the aorta, palpate just to the left of the midline in the upper abdomen.

Normally it pulsates directly upward anteriorly and should be about 2 .5 -4 cm wide.

If it feels much wider than that and the pulsation pushes your fingers outward laterally, that strongly suggests an abdominal aortic aneurysm.

Okay, let's level up.

Sometimes the standard exam isn't enough and you need advanced maneuvers.

Let's say you walk into the room and the patient has a hugely distended abdomen with bulging flanks.

You suspect ascites, which is free fluid pooling in the peritoneal cavity.

How do you prove its fluid and not just trapped gas?

You use two specific tests, the fluid wave and shifting dullness.

Think about the physics of the fluid wave test.

You have the patient place their own hand firmly down the midline of their stomach to stop ripples in the fat.

You stand on one side, place your hand on their flank, and strike the opposite flank.

If the abdomen is full of gas, nothing happens.

But if it's full of ascites fluid, that strike generates a physical wave through the liquid that travels across the abdomen and you will actually feel the tap against your resting hand.

Shifting dullness relies on gravity.

You percuss the patient while there is supine, mapping out the borders where the tympanic gas gives way to the dull fluid pooling on the sides.

Then you have the patient roll onto their side.

If it's fluid, gravity pulls it down and that line of dullness will shift higher up.

Though again, while these tests are amazing clinical skills, bedside ultrasound is the ultimate tiebreaker today.

We also have incredibly specific special tests for appendicitis and localized inflammation.

There's rebound tenderness, also known as the Bloomberg sign.

You choose a side away from the painful area, push down slowly and deeply, and then lift your hand up very quickly.

The rapid release causes the inflamed peritoneal layers to instantly snap back and rub against each other.

If that release causes sharp pain, that confirms peritoneal inflammation.

Then there is inspiratory arrest, the Murphy sign, which targets the gallbladder.

You hold your fingers firmly under the liver border and ask the patient to take a deep breath.

As the descending liver pushes the inflamed gallbladder down onto your examining hand, the sudden sharp pain makes the patient abruptly gasp and halt their breathing.

And for suspected appendicitis, there are several tools.

You assess for McBurney point tenderness, which is a specific anatomical spot, 1 .5 to 2 inches from the hip bone towards the umbilicus.

You could also do the iliopsoas muscle test.

You have a patient lay flat and lift their right leg against your resistance.

When they do that, the psoas muscle in the abdomen flexes.

If the appendix is inflamed, that flexing muscle rubs right against it, causing severe RLQ pain.

And there's a scoring system in the chapter, right?

The Alvarado score or the Mantrola score.

It's not just an acronym to memorize.

It's a clinical tool that actually saves patients from unnecessary appendectomies.

It tallies up specific symptoms, signs, and lab values like a shift to the left in white blood cells.

A score of seven or higher means appendicitis is highly probable.

Exactly.

Before we wrap up the exam, we have to mention developmental adaptations.

Kids and older adults require a different approach.

For infants, you are checking for an umbilical hernia, a bulge that's common and usually disappears by age one.

You also check for diastasis recti, a separation of the abdominal muscles.

And remember, their first stool within 24 hours of birth should be meconium sticky and greenish black.

And if you are examining a toddler and they are tense and ticklish, you can't just tell them to relax.

Make a game of it.

Have them pant like a dog.

It naturally relaxes the muscles of their normal childhood pot belly.

And for the aging adult, keep in mind their thinner abdominal wall makes organs much easier to palpate.

But their nervous system changes mean their response to acute pain might be blunted.

An older adult with a raging infection might not show the extreme agony a 20 -year -old would.

That brings us to the final piece, health promotion and documentation.

As a nurse, you are an educator first and foremost.

The chapter emphasizes teaching patients about the risks of hepatitis B and C.

Both are blood -borne and both can lead to chronic infections that quietly scar the liver over decades, leading to cirrhosis and massively increasing the risk of liver cancer.

And when you've finally sent down to chart, precision is your best friend.

The chapter provides phenomenal tables to help you interpret what you've found.

You need to be able to chart the difference between a patient whose abdomen is distended from obesity, where you'll hear normal bowel sounds and scattered dullness, versus distension from trapped air, where you'll hear hyperactive sounds and overwhelming timpani.

You must be able to recognize and document the timeline of an intestinal obstruction, charting their history of abdominal surgery, their colicky pain and vomiting, and how their bowel sounds went from hyperactive and rushing to completely ominously silent.

You also have to understand the weirdness of referred pain.

Why does a patient with an angry gallbladder complain that their right shoulder hurts?

Because during fetal development, the organ migrated downward, but it kept its original nerve wiring.

The brain misinterprets the distress signal is coming from the shoulder.

If we connect this to the bigger picture, everything we just talked about is linked.

Your understanding of that foundational anatomy seamlessly sets up your subjective interview.

That interview zeros in on the exact physical exam techniques you need to use.

And those physical findings,

the dullness, the guarding, the shifting fluid,

ultimately drive your clinical interpretation.

That chain of logic is what guarantees safe patient care.

When you document a normal abdomen, you write flat, symmetric, soft, non -tender, timpani predominates, normal bowel sounds.

But charting an acute abdomen is a totally different story.

Rigid, board -like musculature, extreme tenderness to palpation, rebound tenderness present, and absent bowel sounds.

That's true.

So what does this all mean?

It means you have the tools to do the job, but I want to leave you with a provocative thought.

Think about the subjective history and the objective data as two different sides of a conversation.

What do you do when the physical exam findings, what your hands are absolutely feeling, completely contradict the story the patient is telling you, and you don't have a bedside ultrasound machine to break the tie?

How do you trust your clinical judgment?

This raises an important question, and honestly, that is the true art of nursing.

Learning when to trust the textbook and when to trust your hands.

Thank you so much for joining us on this review.

From all of us here at The Deep Dive, and a warm thank you specifically from the Last Minute Lecture Team, congratulating you on mastering the abdominal assessment.

Trust your knowledge, trust your hands, and you are going to absolutely crush your clinicals.