Chapter 3: Abdominal Pain Assessment & Differential Diagnosis

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Welcome back to The Deep Dive.

If you are listening to this, you are probably buried under a pile of textbooks, maybe nursing notes, or perhaps you are driving to a clinical rotation right now.

Today, we are tackling a monster.

It is a topic that likely makes up a huge percentage of the cases you will see in primary care, yet it remains one of the most intellectually demanding puzzles in medicine.

We are talking about abdominal pain.

It is the ultimate black box.

You have a cavity filled with multiple organ systems,

gastrointestinal, reproductive, genitourinary, vascular, all packed together, all sharing nerve pathways and all screaming for attention in different ways.

When a patient walks in clutching their stomach,

the stakes are incredibly wide, ranges from I ate too much spicy food to my aorta is dissecting and I have minutes to live.

That is the terrifying part, isn't it?

The spectrum of severity is so vast you cannot dismiss a tummy ache.

You absolutely cannot.

That is why we are treating this episode as a last minute lecture.

We know our audience includes a lot of nursing students and advanced practice students preparing for boards or that first terrifying day of practice.

Our mission today is to walk through chapter three of advanced health assessment and clinical diagnosis in primary care.

We are going to deconstruct the text, strictly sticking to the source material, but really expanding on the why and the how so you can actually use this in the room.

We are going to map the abdomen,

decode the patient's behavior, and build a safety net so you don't miss the surgical emergencies.

So let's start at the very, very beginning.

The text offers a definition of abdominal pain that seems almost deceptively simple.

It calls it a subjective feeling of discomfort.

It sounds vague, right?

But that word subjective is doing a lot of heavy lifting there.

Pain is whatever the patient says it is, but biologically the text breaks down the actual mechanisms of abdominal pain into three distinct categories.

And if you can figure out which mechanism is firing,

you are halfway to the diagnosis.

Okay, let's unpack these three mechanisms because this is the foundation for everything else we are going to talk about.

The first one listed is tension.

Right.

Tension.

So think of this as a mechanical force.

It's either stretching or contracting.

In the gut, we are usually talking about acute stretching of a capsule, like the liver or the spleen swelling up and pushing against its own skin, you know.

Like a balloon filling up too fast.

Exactly.

Or, and this is the big one, we were talking about colic.

We hear colic all the time, usually regarding babies, but in this context, it means something very specific about the muscles, doesn't it?

Exactly.

Colic, the adult pathophysiological sense, is forceful peristalsis.

It's the body trying to push something through a hollow tube that is blocked.

Imagine a kidney stone in the ureter or a blockage in the intestine.

The smooth muscle behind that blockage contracts violently to overcome the resistance.

That rhythmic wave -like cramping, that gripping pain, that is tension pain.

So if a patient describes the pain as coming in waves or gripping and then letting go, our first thought should be tension.

That's your first bucket.

Yes.

What about the second mechanism?

The second is ischemia.

And this is the one that should make the hair on the back of your neck stand up.

Ischemia is a lack of blood flow.

So this would be things like a strangulated bowel or a twist in the gut.

Yes, exactly.

If you have a bowel obstruction that twists so tight it cuts off the mesenteric arteries, the tissue starts to die.

Or a volvulus.

The text describes ischemic pain as intense and continuous.

So not in waves like colic.

No, not at all.

Unlike colic, which might come and go, ischemia is relentless.

It is the tissue literally screaming for oxygen.

There's no relief.

Okay, so tension is mechanical and muscular.

Ischemia is vascular hypoxic.

That leaves the third mechanism, which I suspect is the most common one we see.

Likely is, yeah.

Okay.

The third is inflammation.

Specifically inflammation of the peritoneum, which we call peritonitis.

But here is the nuance that the text really emphasizes.

Peritonitis isn't static.

It evolves.

It usually begins as visceral inflammation.

Visceral meaning it's affecting the organ itself.

The gut lining or the appendix itself.

Correct.

It's on the viscera.

And visceral pain is dull, poorly localized, and vague.

The brain knows something is wrong, but it can't quite point to it.

The patient will often just gesture vaguely at their midsection.

It just hurts in here.

Exactly that.

But if that inflammation goes unchecked, let's say an appendix that keeps swelling, it eventually touches the parietal peritoneum.

That is the lining of the abdominal wall.

And that changes the game.

Completely.

The parietal peritoneum is innervated by somatic nerves.

It is precise.

It has pinpoint location.

So the pain shifts from somewhere in the middle of my belly to right here, sharp and severe.

Wow.

And that shift from visceral to parietal is the classic story of appendicitis.

That distinction actually leads perfectly into how patients behave.

The text makes a really interesting point about observing the patient in the waiting room or on the exam table.

You can almost diagnose the mechanism just by looking at their body language.

You can.

It's one of those clinical pearls that makes you look like a magician.

Let's go back to that tension pain, the colic.

If a patient is trying to pass a kidney stone or has a bowel obstruction, they are restless.

Because they can't get comfortable?

Is that the idea?

Right.

The pain is internal and rhythmic.

They pace the room, they twist in the chair, they curl up, then they extend their legs.

They're moving constantly to try to find a position that relieves that internal pressure.

Okay, so they're writhing.

Writhing is the perfect word.

Now, contract that with a patient who has peritoneal inflammation.

The parietal pain.

Yes.

They are statues.

They lie perfectly still.

Often, they will have their knees drawn up to relax the abdominal muscles, and they are terrified to move.

Why the fear of movement?

What's happening there?

Because the parietal peritoneum is inflamed.

It's like a sunburn on the inside of your abdominal wall.

Every time you move, cough, or even if someone bumps the stretcher, the abdominal contents shift and rub against that raw, inflamed lining.

It's agony.

So if you walk into a room, the patient screams because you bumped the bed.

That is peritonitis.

End of story.

That is such a vivid image.

The restless pacer versus the frozen statue.

Now, before we get into the specific conditions, we have to address a concept that confuses every student at some point.

Referred pain.

It confuses students because it feels like the body is lying to you.

Referred pain is feeling pain in a location distant from the diseased organ.

But it's not random.

It's all based on embryology and wiring.

It's crossed wires, essentially.

In a way, yeah.

Tissues share neural pathways.

The nerves supplying an abdominal organ enter the spinal cord at the same segment as nerves supplying a patch of skin somewhere else.

The brain gets the signal and gets confused about the source.

It misinterprets where the pain is coming from.

The classic example is the appendix, right?

The textbook example.

It's the perfect one.

The appendix is in the right lower quadrant.

But the nerves supplying it enter the spinal cord at the same level as the umbilicus.

The belly button.

Right.

So when appendicitis starts, in that early visceral phase, the patient points to their belly button.

They complain of a dull ache around their navel.

It's only later, when the inflammation touches the abdominal wall, that the pain migrates to where the appendix actually sits.

So understanding that wiring helps us not get tricked by the early presentation.

Exactly.

Don't ignore belly button pain just because there's no major organ right there.

It could be the appendix, the small bowel, or even the aorta calling from a distance.

Okay, we have our mechanisms.

Tension, ischemia, inflammation.

We have our behavioral clues.

Restless versus still.

And we have the concept of referred pain.

Now let's talk about the diagnostic process.

The text breaks down the classification of abdominal pain by age adults versus children.

How do we categorize this when a patient walks in?

For adults, we generally put them in three buckets.

First is acute pain, sudden onset, severe, short duration.

Second is chronic pain, persistent or recurrent over a long period.

And the third is a special category called the acute abdomen.

Acute abdomen sounds dramatic.

It sounds like a title of a movie.

It is meant to be dramatic.

In surgery and primary care, acute abdomen is shorthand for a condition that requires immediate surgical intervention.

It's a code word.

So if you label someone with that, you're raising a big red flag.

You're essentially saying, I need a surgeon and I need them now.

It bypasses a lot of other steps.

And for children, what are the categories?

Similar categories, acute or recurrent.

But the text gives a very specific definition for recurrent abdominal pain, or RAP.

It's defined as more than three episodes of pain in a three -month period that are severe enough to interrupt their activities.

Is that common?

I feel like I hear about that a lot.

It's extremely common.

And here is the statistic from the text that should lower your blood pressure a little bit.

The text states that 90 % of children with RAP recurrent abdominal pain have no organic etiology.

90%.

So 9 out of 10 times, there isn't a physical disease.

Correct.

It's often functional, related to stress, school anxiety, constipation, or gut -brain interaction.

But, and this is a huge but, you cannot assume it's functional until you have ruled out the organic causes.

You still have to do the work.

You have to earn that diagnosis.

Let's do the work then.

We are in the history phase of the exam.

The text outlines key questions.

The first fork in the road seems to be onset, sudden versus gradual.

Why does that matter so much?

Because the speed of onset correlates with the mechanism of the pain.

If a patient says, I was fine one second, and the next second I was on the floor in agony, that is sudden onset.

And that points to what?

That points to mechanical issues, like the tension or ischemia we talked about.

Right.

Think about a perforation, a hole glowing open in the stomach, or a torsion, an ovary twisting on its stalk, or a kidney stone dropping into the ureter.

Those events happen in an instant.

The pain hits like a lightning bolt.

And gradual onset, the slow burn.

Gradual onset pain that smolders and builds over hours or even a day is much more consistent with an inflammatory process.

It takes time for bacteria to multiply in the appendix.

It takes time for the gallbladder wall to get inflamed and thickened.

If the story is, it started as a nagging ache this morning and got worse all day, we should be thinking infection or inflammation.

Exactly.

Appendicitis, pancreatitis, calcistitis, they all tend to have that slower, more gradual buildup.

There is a specific rule mentioned in the text that I want to highlight.

It's called the 6 to 24 hour rule.

This feels like a major red flag guideline.

It is a cornerstone of primary care safety.

The rule states,

if a patient has had severe abdominal pain that has lasted for 6 to 24 hours, you should presume it is a surgical condition until proven otherwise.

That is a very aggressive stance.

Why so specific on the timeframe?

It has to be.

Think about it.

If severe pain persists for that long, it's not just gas.

It's not just something I ate.

Something organic and serious is happening.

The inflammatory process has had time to declare itself.

The text is telling students, do not send this patient home with reassurance unless you are absolutely sure.

You need to rule out the killers.

You have to rule out the killers.

Speaking of killers, the text actually provides a surgical emergency checklist.

I think we should walk through this list.

These are the diagnoses we literally cannot afford to miss.

Agreed.

Let's take them off.

First, perforation.

This could be a ruptured appendix or a perforated peptic ulcer.

Acid and stool in the peritoneum.

A disaster.

A total disaster.

Second, ectopic pregnancy.

The text is extremely firm here.

You must suspect this in any woman of childbearing age with abdominal pain.

Even if she says she isn't pregnant or she's on birth control.

Even if she swears it.

Even if she says she uses protection.

Until you have a negative urine HCG, she's an ectopic pregnancy in your mind.

Ruptured ectopics are a leading cause of maternal mortality in the first trimester.

You miss it.

She can bleed out internally.

Okay, point taken.

What's next on the checklist?

Obstruction.

Usually presenting with that crampy peri -embilical pain and vomiting.

Then, the vascular nightmare.

Ruptured abdominal aortic aneurysm or AAA.

How does that present?

The text notes that if you have an older patient with abdominal pain and back pain, you have to think AAA.

The aorta is retroperitoneal, so the pain often starts in the back.

And for the pediatric population, the checklist is different for them, right?

It is.

It highlights intersusception where the bowel telescopes into itself and malrotation with volvulus, which is a twisted gut.

These are the surgical emergencies specific to infants.

We have covered onset and the danger list.

Now let's talk about assessing severity.

This is notoriously difficult because pain is so subjective.

It's the hardest symptom to quantify.

For adults, we are used to the 0 to 10 scale.

But even then, one person's 10 is another person's 7.

But the text really highlights the challenge with children.

A four -year -old doesn't understand numbers abstractly.

Right.

How much does it hurt from 1 to 10 is meaningless to them.

So what tools does the text recommend?

It discusses the outer scale and the faces scale.

The outer scale is fascinating because it uses actual photographs.

It has a vertical number scale for older kids from 0 to 100.

But alongside it are six photographs of a child's face.

Real photos of a child.

Yes, real photos.

The bottom photo is a calm, happy child.

As you go up, the faces show increasing levels of distress, crying, and real pain.

And importantly, the text notes, there are different versions, African -American, white, Hispanic.

So the child can select the face that looks most like them.

That's incredible.

So you just ask which one of these pictures looks like how you feel.

Exactly.

It's much more concrete and reliable.

The faces scale is similar but uses cartoon drawings of faces instead of photos.

But beyond scales, are there behavioral red flags for severity?

Things that just cut through the noise?

Yes.

The text points out two massive indicators that override any number on a scale.

Number one, sleep.

What about it?

If the pain is severe enough to wake a patient, adult, or child from a sound sleep, it's almost certainly organic.

Functional pain, like stress -related tummy aches in kids, rarely wakes them at 2 a .m.

Organic pain does not respect the clock.

That's a huge pearl.

What's number two?

Number two, activity level.

Particularly in children.

Meaning?

Meaning, does the child stop playing?

If a parent calls and says, he's complaining of pain, but he's currently playing Fortnite and jumping on the couch, you have some breathing room.

But if they say he won't move, he refuses his favorite snack and he's just lying there, that is a huge danger sign.

The text makes the point that a sick child stops being a child.

They lose that playful energy.

That is a profound way to put it.

A sick child stops being a child.

Okay, moving on to section two of our outline.

We are going to map the abdomen.

Location is everything.

It is.

We are playing detective and the map is the abdomen.

We mentioned the ABLY rule briefly before, but let's formalize it because it's so useful.

Go for it.

The ABLY rule states,

the further the pain is from the umbilicus, the more likely it is to be organic.

I love that rule.

It's so simple.

So if the child points right to their belly button, it's a toss -up, could be stress, could be early appendix, but if they point way out to the side.

If they point specifically to the flank or the groin or up under the ribs,

you need to pay close attention.

That suggests the parietal peritoneum is involved, which means a specific organ is inflamed.

The text has a massive table, table 3 .1, that breaks down the differential diagnoses by a quadrant.

We obviously can't read the whole table, but let's do a lightning round of the anatomy.

I'll give you a quadrant.

You tell me what organs are living there and what the text says can go wrong.

Let's do it.

Let's start with the right upper quadrant, RUQ.

Okay, the liver and the gallbladder dominate this space.

So cholecystitis, gallbladder inflammation is the big one.

Hepatitis, inflammation of the liver.

But also, don't forget the duodenum runs through there.

So duodenal ulcer can cause pain here.

And the text adds a non -abdominal cause, which is a great catch.

It does.

Pneumonia.

Wait, pneumonia is in the lungs.

Why is it causing RUQ pain?

Because the right lower lobe of the lung sits right on top of the diaphragm.

If that lung is infected, it inflames the diaphragm, and that diaphragmatic irritation refers pain right down into the upper abdomen.

It's a classic mimic.

Always listen to the lungs in a patient with upper abdominal pain.

Great point.

Okay, left upper quadrant, LUQ.

The spleen lives here.

So a ruptured spleen is a big concern after trauma or in someone with mono.

Also the stomach, so gastric ulcers and the tail of the pancreas.

Plus the abdominal aorta runs down the middle, but can refer pain here if there's an aneurysm.

Right, lower quadrant, RLQ.

The most famous quadrant in medicine.

The appendix.

The appendicitis is king here, no question.

But in women, you have the right ovary and the fallopian tube.

So you have to think ectopic pregnancy or a ruptured ovarian cyst.

And don't forget the ureter or renal stone often causes pain here as it travels down toward the bladder.

Left lower quadrant,

LUQ.

The sigmoid colon.

This is diverticulitis territory.

That's the most common cause of LUQ pain in older adults.

But again, just like the right side, in women you have to consider ectopic or ovarian pathology.

And finally, periambulical,

right in the bullseye, around the navel.

This is visceral pain territory.

So you think of things that affect the mid -gut.

Intestinal obstruction is a big one.

Early appendicitis, as we said.

And the big vascular one.

A leaking or dissecting abdominal aortic aneurysm.

The text also discusses radiation patterns.

Sometimes the pain starts in one place but shoots somewhere else.

What are the classic patterns the text wants us to memorize?

There are three classics that are practically pathognomonic.

One, gallbladder or biliary colic.

It starts near UQ but it radiates around to the back and up to the right.

Scapula, the shoulder blade.

Shared innervation through the phrenic nerve.

It's a very specific clue.

Two, renal colic, kidney stones.

In males, this pain radiates from the flank, wraps around and goes right down into the testicle on the same side.

If a man comes in with flank pain and testicular pain, it's a stone until proven otherwise.

And three, a ruptured spleen.

This refers pain to the top of the left shoulder.

That one has a name, doesn't it?

I remember reading that.

Care sign.

It's caused by blood from the bleeding spleen pooling under the diaphragm.

That blood irritates the diaphragm and again, the phrenic nerve picks up that irritation and sends a signal all the way up to the shoulder.

It's a huge red flag for internal bleeding.

Moving to section three, character, aggravating factors and associated symptoms.

The adjectives the patient uses to describe the pain matter a lot.

They do.

The words are clues.

If they say cramping or colicky,

we are back to that tension mechanism obstruction of a hollow tube like the bowel or ureter.

It's rhythmic.

The patient is usually agitated and moving.

What if they say steady?

A steady, constant, deep pain suggests an inflammatory process like pancreatitis or ischemia.

It's not coming in waves.

It's just there and it's awful.

Burning makes you think of acid.

So esophagitis, G -E -R, the text also uses the word gnawing.

For duodenal ulcers like a hunger pang that won't go away.

And the scariest one, tearing.

Yeah.

If a patient says it feels like something is tearing or ripping inside them, especially if it feels like it's ripping down their back, that is the terrifying classic description of an aortic dissection.

That's a call 911 situation.

What about aggravating factors?

What makes it worse?

The text lists a few.

Alcohol is a big one.

It can trigger gastritis or pancreatitis.

Lying down flat often worsens esophagitis or G -E -R because gravity isn't helping keep the acid down anymore.

And deep inspiration, taking a big breath in.

That points to two things.

It could be chloridic coming from the lungs or the lining of the lungs, or it's classic for biliary colic and colicestitis.

Why does breathing hurt the gallbladder?

Think about the anatomy.

The diaphragm is a big muscle that pushes down when you inhale.

If the gallbladder, which is tucked right under the liver, is inflamed, the descending diaphragm literally jams it against the liver or the abdominal wall.

It hurts so much that the patient literally stops breathing mid -inspiration.

We'll talk about that specific sign later.

And relieving factors.

What makes it better?

If food or antacids help, it might be a peptic ulcer.

The food buffers the acid.

If defecation or passing gas helps, it's almost certainly coming from the intestine, think IBS, or simple constipation and gas.

And if vomiting provides relief, that points to a visceral origin, often an obstruction.

Let's talk more about vomiting.

The text analyzes this in detail, and there is one rule about timing that I found incredibly useful.

The pain vomiting sequence.

This is critical for differentiating medical from surgical causes.

Okay, write it down.

If the vomiting starts before the pain, it is usually a medical cause like gastroenteritis or food poisoning.

You feel sick, you throw up, then your belly starts to cramp.

But if the abdominal pain starts first, and then the patient starts vomiting an hour or two later, that is highly suggestive of a surgical cause.

That is the classic presentation of appendicitis or a small bowel obstruction.

The pain comes from the inflammation or blockage, and the vomiting is a secondary reflex.

So pain first, vomit second, call the surgeon, vomit first, pain second.

Think about a bucket and fluids.

It's a very, very useful rule of thumb.

Yes.

Also, you have to look at the vomit itself.

The appearance tells a story.

What are we looking for?

The text warns us to pay special attention to bilious vomiting in an infant.

If an infant throws up green or yellow fluid, that means the blockage is below the point where bile enters the gut from the liver.

That suggests a volvulus, a twisted gut.

It is a true surgical emergency.

And if there's no bile?

No bile in the vomit of a projectile vomiting infant might point towards pyloric stenosis, where the blockage is at the outlet of the stomach before the bile duct.

And feculent emesis, that sounds unpleasant.

It is exactly what it sounds like, vomit that looks and smells like stool.

It means there's a distal obstruction way down in the colon, and everything is backing up the entire length of the GI tract.

It's a horrible late sign of a severe blockage.

Okay, let's shift gears to section four, review of systems.

Because the abdomen doesn't exist in a vacuum, the text explicitly tells us to look at the neighbors.

Right.

You have to be a whole body detective.

A problem elsewhere can masquerade as belly pain.

For the cardiovascular system, a myocardial infarction, a heart attack, can present as epigastric pain or indigestion.

Especially in women or older adults with diabetes.

Exactly.

They might not have the classic crushing chest pain.

So if you have a patient with risk factors complaining of new onset indigestion that feels suspicious, you get an EKG.

Also, right upper quadrant pain can be congestive heart failure.

The liver gets engorged with backed up blood and it hurts.

Genitourinary.

Well, we come back to the pregnancy rule.

Always, always rule it out.

But also look for PID, pelvic inflammatory disease.

The text notes that PID pain often starts right after men's ends.

It's usually bilateral, severe, and progressive.

And of course, look for hematuria, blood in the urine, which points to kidney stones or a UTI.

And we already mentioned respiratory, the pneumonia connection.

Correct.

Fever plus abdominal pain plus cough equals check the lungs.

Especially in children, lower lobe pneumonia is a very common cause of referred abdominal pain.

The text also has a really helpful table, table 3 .2, comparing organic pain versus functional pain.

This seems crucial for those chronic or recurrent patients.

It is.

It helps you sort out the worried well from the subtly sick.

We've already talked about the sleep factor.

Organic pain wakes you up.

Functional pain doesn't.

What are the other key differentiator?

Look for vegetative signs.

Organic pain is often accompanied by objective findings like fever, weight loss, or stunted growth in kids.

Functional pain, which is often stress or depression related, usually presents with vague peri -embilical pain.

But the child is growing normally, eating normally, and sleeping through the night.

The pain is real, but the cause isn't a diseased organ.

Okay, section five, we are finally putting hands on the patient.

The physical examination.

And it starts before you even touch them.

General inspection.

We circle back to the restless versus still behavior we discussed.

Do they look comfortable?

Are they pacing?

Are they rigid?

And for children, the text adds another layer?

Yes, for children, it adds a nuance.

If a child is septic or has a perforation, they look toxic.

They are lethargic, withdrawn, pale with sunken eyes.

If they're just colicky, they might be screaming and writhing.

But in between spasms, they have good color and energy.

It's a different kind of sick.

Vital signs.

What's the trap here that students fall into?

The trap is assuming a high fever means a surgical abdomen.

The text says a temp greater than 39 .4 degrees Celsius, or 102 .9 Fahrenheit, usually points away from the abdomen and towards the kidney, like polynephritis or the lungs pneumonia.

That's counterintuitive.

It is.

But uncomplicated appendicitis usually has a low -grade fever initially.

If a patient with appendicitis has a really high fever, it might mean it has already ruptured and they're becoming septic.

And the sterivitals, the ones that make you act fast.

Tachycardia plus hypotension.

A fast heart rate and a low blood pressure.

That is the definition of shock.

That means internal bleeding like a ruptured ectopic or a leaking AAA or full -blown sepsis.

Now, inspecting the abdomen itself, the text lists the Fs of distension.

I feel like this is a classic nursing school mnemonic.

It is.

And for good reason.

Because it works.

If the belly is big and distended, you run through the Fs.

Fat, fluid, which is ascites, feces, constipation, fetus pregnancy, flattus gas, fibroid, a full bladder, false pregnancy, and the one you don't want to find a fatal tumor.

The text also mentions some skin signs that sound like they belong in a history book.

Colon sign and gray turner sign.

They are rare.

But if you see them, you know exactly what is happening.

Colon sign is bruising or ecumosis around the umbilicus.

It looks like a faint blue -purple smudge.

Gray turner sign is bruising on the flanks on the sides between the ribs and the hip.

Both of them indicate hemocarotoneum blood in the belly.

This could be severe hemorrhagic pancreatitis, where the enzymes are eating through blood vessels, or a ruptured ectopic pregnancy.

It's a sign of a catastrophic internal bleed.

And for kids, there is a specific rash mentioned.

Yes.

Hinox shownline purpura, or HSP.

It's a type of vasculitis.

It causes a very distinctive palpable purpura, a purple rash you can feel on the buttocks and the back of the legs.

If a child has belly pain and that rash, it's HSP until proven otherwise.

Oscultation.

Listen to the bowel sounds.

Is this actually useful or is it just tradition?

It could be very useful.

You were listening for the two extremes.

Silence.

Absent bowel sounds suggest peritonitis or a paralytic alias.

The gut has been stunned into silence by a major infection or trauma.

And the other extreme.

The opposite.

High -pitched tinkling rushes.

Some people describe it as sounding like a coin dropping in a tin can.

That is the sound of the gut desperately fighting against a mechanical obstruction.

Now palpation.

This is the art.

How do we distinguish a ticklish, anxious patient from a patient with true peritonitis?

The text makes a great distinction between voluntary guarding and involuntary guarding.

Voluntary is when the patient tenses up because your hands are cold or they are scared and anxious.

If you distract them, talk to them, or have them bend their knees to relax their abdominal wall, the muscles will soften.

And involuntary.

Involuntary guarding is rigidity.

The muscles are hard as a board, reflexively, to protect the inflamed peritonium underneath.

You cannot relax a rigid abdomen.

It's a reflex they can't control.

That is a hard surgical sign.

We also check for masses during palpation.

Yes.

In adults, you're feeling for that pulsating, expansile mass in the midline.

The AAA.

In infants, we look for two specific shapes described in the text.

A sausage -shaped mass, often in the right upper quadrant, suggests intussusception.

And an olive -shaped mass, a little hard lump in the RUQ, suggests pyloric stenosis.

It's the thickened pylorus muscle.

And the Murphy sign.

We hinted at it earlier.

Right.

That's the specific gallbladder test.

You press your fingers gently but firmly under the right rib cage and ask the patient to take a deep breath in.

As they inhale, the diaphragm pushes the inflamed gallbladder down onto your examining fingers.

And what happens?

If it's positive, the patient will abruptly stop inhaling because of a sharp spike in pain.

It's a catch in their breath.

That is a positive Murphy sign.

And it is very suggestive of acute colicistitis.

Section 6 deals with special maneuvers.

These are the specific physical tests designed to isolate inflammation, particularly for appendicitis.

The text lists four big ones.

Let's walk through how to actually do them.

First, the obturator test.

This test is designed to check for irritation of the obturator internus muscle, which sits deep in the pelvis.

You have the patient lie on their back, you flex their right leg at the hip and the knee to 90 degrees, and then you rotate the leg internally and externally.

And what are you looking for?

If that rotation causes hypogastric or abdominal pain, it's positive.

It usually means a ruptured appendix or a pelvic abscess is sitting right against that muscle and is being irritated by the movement.

Next up, the iliopsoas test.

Or the psoas sign.

Right.

The appendix often lies right on top of the iliopsoas muscle.

There are two ways to do this.

You can have the patient lie on their left side and you extend the right hip backwards.

Or you can have them lie on their back and ask them to lift their right leg straight up against your hand's resistance.

So you're making them contract that muscle.

Exactly.

This contracts the psoas muscle.

If the appendix is inflamed and sitting on it, that contraction grinds against it.

Pain in the right lower quadrant equals a positive sign.

The Markle test, also known as the heel drop.

This one seems less invasive.

It is.

And it's a great one for kids who are scared of being touched.

You ask the child to stand on their toes and then drop down hard onto their heels.

That jarring impact vibrates the entire abdominal cavity.

If they have peritonitis, that subtle shake will cause a sharp pain.

They'll wince.

They'll wince or grab their belly.

It's a way of testing for rebound tenderness without actually touching them.

And the Rovzing test.

This one is a little weird.

It is.

It's about referred rebound tenderness.

You press deeply and evenly on the left lower quadrant and then quickly release.

If the patient feels pain in the right lower quadrant, it's a positive Rovzing sign.

Why does pressing on the left hurt the right?

The theory is that you are pushing gas and fluid backwards through the colon.

This distends the cecum on the right side, which in turn irritates the inflamed appendix that's sitting right there.

The text also insists on pelvic and rectal exams.

I know students can get nervous about these, but are they non -negotiable?

In the context of undifferentiated lower abdominal pain, yes, they really are.

For women, you need to check for cervical motion tenderness, or CMT.

If moving the cervix side to side causes excruciating pain, it's often called the chandelier sign because the patient metaphorically reaches for the ceiling.

That is the hallmark of PID.

And for men?

For men, you're checking for testicular torsion or epididymitis, which can cause referred lower abdominal pain.

And a gentle rectal exam can check for prostatitis.

The rectal exam is important for everyone, though, right?

Absolutely.

It helps you identify occult blood, rectal masses, or a retrocircle appendix.

That's an appendix that's tucked up behind the cecum that you might not be able to feel from the front.

The only way to find that tenderness might be with a finger in the rectum.

Section 7.

Labs and diagnostics.

We have poked and prodded, now we need technology.

Labs seem pretty standard.

CBC, your analysis?

Standard, but vital.

The CBC gives you the white blood cell count, looking for inflammation or infection.

The urinalysis helps differentiate a kidney stone, which will have blood, or a UTI, with white cells and bacteria from something like appendicitis.

But the text adds a caveat there.

It does.

Be careful, because an inflamed appendix sitting right on top of the ureter can cause a mild inflammatory reaction.

So you might see a few red or white blood cells in the urine.

It can fool you.

And the most important lab test.

For any woman of childbearing age,

the beta HCG, the pregnancy test, it is the most important lab test you will order in this workup, period.

Imaging is where the debate often lies.

Ultrasound versus CT scan.

What does the text say about which to choose?

It really depends on the patient and what you're suspicious of.

The text is pretty clear.

Ultrasound is the preferred first line for ectopic pregnancy, any gallbladder pathology, screening for an aortic aneurysm, and specifically for pediatric appendicitis.

Why specifically pediatric appendicitis?

Why not just CT them?

Because of radiation.

We try very, very hard not to CT scan children if we can avoid it.

Kids are more sensitive to radiation, and we want to limit their lifetime exposure.

Ultrasound is safe, has no radiation, and is very effective, especially in thin children where you can see the appendix clearly.

Okay, so when is CT the right answer?

For adults.

CT is the gold standard for appendicitis, diverticulitis, and pancreatitis.

It just gives you a much clearer, more detailed map of the entire abdomen and what's going on.

And for kidney stones, a non -contrast helical CT is the best test.

There is an evidence -based practice highlight in the text specifically about this CT issue in kids.

Yes, and it's a great study to be aware of.

It showed that by using a clinical algorithm to decide who gets a CT based on their history, exam, and labs, rather than just scanning everyone, a hospital significantly reduced their radiation exposure to children.

And did they miss cases?

No, that's the key.

They did it without increasing the rate of negative appendectomies, which is taking out a healthy appendix, or missing diagnoses.

It validates that good clinical skills, a good history, and exams still matter immensely.

Okay, we have arrived at section 8, the differential diagnosis.

This is the meat of the episode.

We are going to run through the acute conditions, the dangerous ones.

Let's tell the story of each one briefly.

Appendicitis.

The great chameleon.

Starts with that vague, dull, peri -embilical pain.

It's the visceral phase.

Anorexia, a loss of appetite, is a key symptom.

The text notes that if a patient is hungry and asking for food, it's probably not appendicitis.

Right.

Nausea and vomiting follow the pain.

Then, over 6 to 24 hours, the pain migrates and localizes to the ROQ as it becomes parietal.

The text emphasizes using the Alvarado score here to help stratify risk.

What is the Alvarado score?

It's a clinical checklist.

It assigns points for different findings.

Migration of pain, anorexia, nausea, vomiting, tenderness in the ROQ, rebound tenderness, elevated temperature, leukocytosis, a high white blood cell count, and a shift to the left on the differential.

And the score tells you what?

A low score makes appendicitis unlikely.

A high score, generally greater than 7, indicates a high likelihood of appendicitis and the need for a surgical consult.

Ectopic pregnancy.

The story is sudden, often unilateral, lower abdominal pain, maybe with some vaginal spotting, in a woman with a missed or abnormal period.

If it ruptures, she quickly becomes shocky, pale, dizzy, hypotensive tachycardic.

It is a surgical emergency of the highest order.

Teptic ulcer perforation.

The patient presents with a sudden onset of severe, diffuse abdominal pain.

And the key physical finding is a board -like, rigid abdomen.

The ulcer has burned a hole through the stomach or duodenal wall, spilling acid and air into the peritoneum.

And the x -ray finding.

If you do an upright chest x -ray, you might see free air under the diaphragm.

That air shouldn't be there, it escaped from the stomach.

Aortic aneurysm dissection or rupture.

The pain is described as tearing or ripping.

It's excruciating, often maximal at onset.

It frequently radiates to the back, flank, or down into the legs.

And a key exam finding can be a pulse deficit.

You might feel a strong pulse in the right leg, but a weak or absolute one in the left, because the dissection is cutting off blood flow.

Acute pancreatitis.

You have to look for the history.

Heavy alcohol use or a history of gallstones are the two biggest risk factors.

The pain is epigastric and boring, like a drill bit going straight through the back.

These patients vomit relentlessly and often find some relief leaning forward.

Colicestitis.

The classic mnemonic is fat, 40, female, fertile.

Though of course it can happen to anyone.

It's often a colicky RUQ pain that becomes constant, frequently triggered by a fatty meal.

You'll see radiation to the right scapula and that positive Murphy sign on exam.

Kidney stones or ureterolithiasis.

This is a restless patient.

They are writhing in pain.

It's an excruciating, intermittent, colicky pain that starts in the flank and radiates down to the groin or testicle.

Humaturia, blood in the urine, is the smoking gun.

Pelvic inflammatory disease, PID.

Look for a history of STIs or multiple partners.

It's usually bilateral lower quadrant tenderness.

And the chandelier sign on pelvic exam, that extreme cervical motion tenderness is a key finding.

Obstruction versus ileus.

Can we clarify the difference one more time?

An obstruction is a physical block from adhesions, a tumor, or a hernia.

The bowel is actively fighting it, so you hear high -kitch bowel sounds and the patient has severe, crampy pain.

An ileus is a functional paralysis.

The bowel just stops moving, often after surgery or a bad infection.

The abdomen is silent or quiet.

The pain is more from distension than cramping.

Now, let's hit the pediatric acute emergencies.

We mentioned an unto -susception.

Yes, typically in children from two months to two years of age.

The text describes a very specific pattern of pain.

Scream, sleep, scream.

The child has a spasm of intense pain where they scream and pull their legs up.

Then the pain stops completely and the child looks exhausted or lethargic.

Then, 15 minutes later, it hits again.

What are the other signs?

The late sign is current jelly stools, which is stool mixed with mucus and blood.

And on exam, you might feel that sausage -shaped mass.

Now, rotation with vulvulus.

This happens very early, usually in the first month of life.

The cardinal sign is Billy's emesis, green vomit in a newborn.

The gut is twisted.

The blood supply is cutting off.

You have hours, not days, to save the gut.

Finally, that rash again.

Hedox shown line purpura.

Right.

It's a systemic vasculitis.

The presentation is a classic triad.

Palpable purpura rash on the legs and buttocks plus abdominal pain plus arthritis or joint pain.

Deep breath.

That was the scary stuff.

Let's finish with section nine, chronic conditions.

These are the patients you will see repeatedly in your primary care clinic.

Let's divide them into lower and upper abdomen, lower abdominal chronic.

IBS, irritable bowel syndrome is probably the most common.

The key diagnostic clue from the text is that the pain is often relieved by defecation and it's associated with a change in stool form, like a swing between diarrhea and constipation.

And there's often mucus in the school.

And what do we need to rule out?

Colon cancer.

It's always on the radar for older adults.

The text lists the red flags.

Involuntary weight loss, blood in the stool, or a new change in bowel habits in someone over 50.

Also diverticular disease recurrent LLQ pain, maybe low -grade fevers.

And don't forget, simple things like lactose intolerance with cramping and gas specifically after dairy.

Upper abdominal chronic.

GRE is number one.

Heartburn, regurgitation, that water brush, acid taste in the mouth, and it's classically worse when lying down after a meal.

Peptic ulcer is also common.

It's that knowing, empty feeling.

And the text points out a difference in how ulcers present with food.

It does.

Duodenal ulcers are often relieved by food because the food buffers the acid, but then the pain returns two, three hours later.

Gastric ulcers, on the other hand, might hurt more with food as eating stimulates acid production.

And of course, we think about H.

pylori infection as the cause.

And what if all the tests are negative?

Then you might land on functional dyspepsia.

This is indigestion, where we can't find an ulcer or another organic cause.

It's a diagnosis of exclusion.

And finally, two specific pediatric chronic conditions that are just fascinating.

They really are.

First, abdominal migraine.

That sounds made up.

A migraine in your stomach?

It's real.

The text says it's typically seen in girls aged 7 to 10.

They have these episodes of intense midline abdominal pain that can be disabling.

But crucially, they also have associated symptoms like headache,

nausea, photophobia, and often a strong family history of migraines.

It's treated like a migraine.

Wow.

And the other one?

The other is that recurrent abdominal pain, or R .E .P.

of childhood that we mentioned, ages 5 to 10, often stress -related.

The key differentiator, again, the pain is periambilical.

It's vague, but it does not wake them from sleep.

Wow.

We have really, really deconstructed this chapter from the first neuron firing in the gut to the final diagnosis on the chart.

How do we synthesize this for the listener?

What is the game plan for that student walking into a room?

The game plan for primary care is a funnel.

Step one, rule out the surgical emergencies.

Scan for the acute abdomen signs.

We talked about shock, a rigid belly, pain lasting more than six hours.

That's your safety net.

Okay.

Step two, if they are stable, then you categorize.

Use the location, the quadrants, and the history on set character to narrow down your list of possibilities.

And then step three, use your physical exam maneuvers and targeted labs and diagnostics to confirm or refute your primary suspicion.

It's a systematic process of narrowing the field.

And the final thought to leave them with, the one thing they absolutely must remember.

Serial examinations.

Abdominal pain is dynamic.

It's a process, not a static event.

A patient might look okay at 9 a .m.

and be perforated by noon.

If you aren't sure, it is never wrong to wait and re -examine them in a few hours.

The clinical picture evolves and you need to be there to catch it when it does.

Don't just take a snapshot, watch the movie.

Thank you so much for joining us on this deep dive.

We know this material is dense, but mastering the acute abdomen is one of the most important skills you will have as a provider.

Absolutely.

Trust your gut and then go and methodically check theirs.

A warm thank you from the entire last minute lecture team for trusting us with your study time.

Good luck on your exams and go take great care of your patients.

See you next time.