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Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Acute Cholecystitis

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In one line

·A gallstone plugs the cystic duct (the narrow tube that drains the gallbladder), trapping bile inside so pressure climbs, the wall swells, and bacteria multiply—turning a simple blockage into an infected, inflamed gallbladder that may die, tear, or spill into the belly if not drained or removed.

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Normal physiology

·The gallbladder is a hollow, pear-shaped sac about 3 to 4 inches long that sits tucked under the right lobe of the liver, just below your ribcage. It stores bile—a yellow-green fluid your liver makes continuously—and concentrates it by sucking out water so a little squeeze delivers a strong dose. When you eat fatty food, your intestine releases cholecystokinin (CCK, a hormone that signals the gallbladder to squeeze) into your bloodstream. CCK tells the smooth muscle wall of the gallbladder to contract hard and tells the sphincter of Oddi (the valve where the bile duct meets the intestine) to relax and open. Bile shoots out through the cystic duct, merges with the common bile duct, flows through the sphincter, and empties into the duodenum (the first part of your small intestine). There, bile acts like dish soap—it breaks big fat droplets into tiny ones so digestive enzymes can chop them up and your gut can absorb them. Normal flowing bile also sweeps bacteria backward out of the gallbladder, keeping it flushed clean. The wall is thin—under 3 millimeters—smooth, and pink because blood flows freely through tiny vessels in the mucosa (lining), muscularis (muscle layer), and serosa (outer skin). This cycle—store, concentrate, squeeze, drain, refill—runs smoothly meal after meal, day after day. Keep this normal picture in your head, because every finding in acute cholecystitis is a break from this smooth flow.

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What goes wrong

·One broken thing upstream explains all the weird findings you see downstream. In acute cholecystitis, that one thing is a gallstone or thick bile sludge plugging the cystic duct so bile cannot drain out. Everything that follows—the unrelenting pain, the fever, the swollen wall, the climbing white count, the infection—is your body reacting to that single stuck cork. Trace every symptom backward, and they all point to the same root cause: the exit tube is blocked.

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Hallmark signs

·Steady pain in the right upper belly lasting more than 6 hours
·Pain shooting to the right shoulder or shoulder blade
·Fever (temperature above 100.4°F or 38°C)
·Nausea and throwing up
·Murphy sign (you gasp and stop breathing when the doctor presses your right upper belly while you breathe in deeply)
·High white blood cell count (above 10,000 cells per microliter)
·Loss of appetite
·Yellow skin and eyes (jaundice) in about 10 to 15 out of 100 people

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Red flags · escalate now

·Rigid belly, rebound tenderness, or guarding—signs the gallbladder may have torn open and bile is leaking into the belly (peritonitis)
·Low blood pressure, racing heart, or confusion—signs of septic shock from infection in the bloodstream
·Gas bubbles in the gallbladder wall on ultrasound or CT (emphysematous cholecystitis)—much higher risk the tissue is dying (gangrene) and will tear open, especially in people with diabetes
·Yellow skin and eyes with high bilirubin level—suggests a stone is blocking the common bile duct or pressing on it (Mirizzi syndrome)
·Severe pain that seems worse than what the physical exam shows—raises concern for dead gallbladder tissue (gangrenous cholecystitis) or blood flow cut off (ischemia)

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Workup

·Complete blood count (CBC) with differential
·Comprehensive metabolic panel (CMP) with liver enzymes (AST, ALT, alkaline phosphatase) and total bilirubin
·Right upper quadrant ultrasound
·HIDA scan (hepatobiliary iminodiacetic acid scan using a radioactive tracer) if ultrasound results are unclear
·C-reactive protein (CRP)
·Blood cultures (two sets from different arm veins) if fever is high (above 38.5°C or 101.3°F) or patient looks septic (low blood pressure, confusion, fast breathing)
·CT scan of the abdomen and pelvis with intravenous contrast if ultrasound is unclear or complications are suspected
·Lipase level if pain radiates to the back or there is concern for pancreatitis

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Treatment

·Intravenous fluids (normal saline or lactated Ringer solution) and nothing by mouth (NPO)
·Broad-spectrum intravenous antibiotics: ceftriaxone 1 to 2 grams once daily plus metronidazole 500 mg every 8 hours, or piperacillin-tazobactam 3.375 grams every 6 hours (or 4.5 grams every 8 hours for severe infection), or a carbapenem (meropenem 1 gram every 8 hours or ertapenem 1 gram daily) if very sick, septic, or resistant bacteria are suspected
·Pain medicine (IV ketorolac 15 to 30 mg every 6 hours for up to 5 days, or opioids like morphine 2 to 10 mg IV every 2 to 4 hours or hydromorphone 0.5 to 2 mg IV every 2 to 4 hours) and anti-nausea drugs (ondansetron 4 to 8 mg IV every 8 hours)
·Laparoscopic cholecystectomy (keyhole surgery to remove the gallbladder) within 72 hours of symptom start
·ERCP (endoscopic retrograde cholangiopancreatography) with sphincterotomy and stone removal if imaging or labs suggest a stone in the common bile duct
·Percutaneous cholecystostomy (a drainage tube placed through the skin into the gallbladder under ultrasound or CT guidance) in high-risk patients who cannot safely have surgery right away
·Ursodeoxycholic acid (ursodiol, 8 to 10 mg per kilogram per day split into 2 or 3 doses, taken by mouth) for patients who refuse surgery or cannot ever have surgery

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NCLEX trap

·First make sure the patient can breathe and their blood pressure and heart are stable. Then get an ultrasound to see what is going on. THEN give pain medicine. Pain medicine is important, but in acute cholecystitis (the gallbladder is swollen, blocked, and infected) the real cure is surgery—taking out the gallbladder within 72 hours. Modern evidence shows that pain medicine does NOT hide important exam findings or delay diagnosis. In fact, treating pain early helps patients cooperate with the exam and imaging. The old fear of 'masking the abdomen' is outdated. Give pain relief as soon as the diagnosis is suspected or confirmed—it is safe and humane.
·Acute cholecystitis means the gallbladder is inflamed and infected because a stone or thick bile has plugged the tube that drains it (the cystic duct). If you don't treat it, the gallbladder wall can die (ischemia—not enough blood reaches the tissue to feed it), tear open and leak bile and pus into the belly (perforation), or fill with pockets of gas from bacteria (emphysematous cholecystitis, most common in people with diabetes). This needs IV antibiotics and surgery to remove the gallbladder within 72 hours—not antacid pills. Missing this diagnosis can lead to sepsis, shock, and death.
·Current guidelines (Tokyo Guidelines 2018, American College of Surgeons, Society of American Gastrointestinal and Endoscopic Surgeons) say to do surgery within 72 hours of when symptoms started. Early surgery—called early laparoscopic cholecystectomy—lowers the chance of complications, shortens hospital stay, reduces the risk of the gallbladder dying or tearing, and is technically easier because the tissues are not yet scarred. Waiting turns a straightforward operation into a harder, riskier emergency with much higher rates of conversion to open surgery, bile duct injury, and death.
·When bile sits trapped in the blocked gallbladder, bacteria from the gut—mainly E. coli, Klebsiella, Enterococcus, and anaerobes like Bacteroides—start multiplying in the stagnant bile. About 50 to 75 percent of patients with acute cholecystitis have positive bile cultures at surgery. IV antibiotics (like piperacillin-tazobactam 3.375 grams every 6 hours, or ceftriaxone 1 to 2 grams once daily plus metronidazole 500 milligrams every 8 hours) kill these bacteria, prevent the infection from spreading into the bloodstream (bacteremia and sepsis), reduce inflammation in the gallbladder wall, and lower the risk of surgical site infection after the gallbladder is removed. Start antibiotics as soon as you suspect or confirm acute cholecystitis.
·Ultrasound of the right upper belly is the FIRST test you should do if you suspect acute cholecystitis, according to the American College of Radiology Appropriateness Criteria. It is fast (takes 10 to 15 minutes), cheap, does not use radiation, can be done at the bedside, and has a sensitivity of 88 percent and specificity of 80 percent for acute cholecystitis. It shows gallstones, a thickened gallbladder wall (more than 3 millimeters), pericholecystic fluid (fluid around the gallbladder), and the sonographic Murphy sign (pressing with the ultrasound probe directly over the gallbladder causes sharp, maximal pain). Only use CT if the ultrasound is unclear or if you need to look for complications like perforation, abscess, or emphysematous cholecystitis. Use a HIDA scan (hepatobiliary iminodiacetic acid scan—a nuclear medicine test that tracks bile flow) only if ultrasound and CT are both inconclusive.
·ERCP is only needed if there is a stone stuck in the COMMON bile duct (the main tube that drains bile from the liver to the intestine) causing backup of bile, yellow skin and eyes (jaundice from bilirubin building up in the blood), or infection spreading up into the liver bile ducts (ascending cholangitis). In simple acute cholecystitis, the stone is stuck in the GALLBLADDER or the small tube leaving the gallbladder (the cystic duct)—NOT in the common bile duct. The treatment is surgery to remove the whole gallbladder. ERCP is not needed and adds serious risk: pancreatitis (inflamed pancreas) happens in 3 to 5 percent of cases, bleeding in 1 to 2 percent, perforation (tearing the intestine or bile duct) in less than 1 percent, and infection. Only do ERCP if lab tests show elevated bilirubin above 4 milligrams per deciliter, dilated common bile duct greater than 6 millimeters on imaging, or a stone visible in the common bile duct on ultrasound or CT.

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