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Acute Cholangitis

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In one line

·A gallstone, scar, or tumor blocks the bile duct so bile cannot drain; bacteria from the intestine swim up into the trapped bile and multiply, then high pressure pushes infected bile into the bloodstream — turning a plumbing problem into a body-wide infection.

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Normal physiology

·The liver makes bile continuously — about 500 to 1000 milliliters every day — and sends it down the common bile duct into the duodenum (the first part of the small intestine) through a small opening called the ampulla of Vater. Bile carries bilirubin (a yellow breakdown product of old red blood cells) and bile acids (detergents that break fats into tiny droplets so enzymes can digest them). Steady forward flow keeps the ducts flushed clean and prevents bacteria from the intestine climbing backward.

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What goes wrong

·A gallstone (about 75 percent of cases), scar (stricture from old surgery or chronic inflammation), or tumor (cholangiocarcinoma, pancreatic cancer, or ampullary cancer) plugs the common bile duct. Bile cannot drain, so it backs up under pressure like water behind a closed valve. Bacteria from the small intestine — normally harmless there — swim upstream into the stagnant bile and multiply because there is no flow to wash them away. High pressure then forces infected bile and bacteria backward into tiny veins in the liver, dumping them straight into the bloodstream. That flood of bacteria and their toxins triggers sepsis (body-wide inflammation), and if pressure stays high the infection cannot clear even with antibiotics — the duct must be drained.

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Hallmark signs

·Fever (often >38.5 °C / 101.3 °F) with shaking chills (rigors)
·Right upper quadrant (RUQ) abdominal pain
·Yellowing of the skin and eyes (Jaundice) (yellowing of skin and whites of the eyes)
·Dark urine (tea- or cola-colored)
·Pale or clay-colored stool
·Nausea and vomiting
·Low blood pressure (Hypotension) (low blood pressure, systolic <90 mm Hg)
·Altered mental status or confusion

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Red flags · escalate now

·Low blood pressure (Hypotension) (systolic blood pressure <90 mm Hg) or signs of septic shock — bacteria are overwhelming your circulation; needs immediate ICU care, IV fluids, antibiotics, and urgent drainage of the blocked duct.
·Altered mental status or confusion — the brain isn't getting enough oxygen, or toxins are building up; part of Reynolds pentad (five-sign pattern) and warns of high death risk without fast treatment.
·Acute kidney injury (creatinine rising, urine output dropping) — sepsis and low blood pressure starve the kidneys of blood; signals that organs are starting to fail.
·Persistent fever or rising white blood cell count despite antibiotics — means the bile duct is still blocked and acting like a sealed abscess full of germs; drainage (ERCP or a needle through the skin) is essential.
·Impaired blood clotting (Coagulopathy) (INR elevated, platelet count low) — the sick liver can't make clotting proteins well, and sepsis uses up platelets; raises bleeding risk during procedures and means severe disease.

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Workup

·Complete blood count (CBC)
·Liver function tests (total and direct bilirubin, alkaline phosphatase, gamma-glutamyl transferase, alanine aminotransferase, aspartate aminotransferase)
·Blood cultures (two sets from different sites, drawn before starting antibiotics)
·Serum lactate
·Right upper quadrant ultrasound
·Magnetic resonance cholangiopancreatography (MRCP) or endoscopic ultrasound (EUS)
·Basic metabolic panel (BMP, including sodium, potassium, creatinine, and blood urea nitrogen)

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Treatment

·Intravenous fluids immediately (normal saline or lactated Ringer solution, 1–2 liters in the first hour, then adjusted based on blood pressure, heart rate, and urine output)
·Broad-spectrum intravenous antibiotics started within one hour (common choices: piperacillin-tazobactam 3.375–4.5 g every 6 hours, OR ceftriaxone 1–2 g every 24 hours PLUS metronidazole 500 mg every 8 hours, OR a carbapenem such as meropenem 1 g every 8 hours if the patient has severe sepsis or risk of resistant bacteria)
·Biliary drainage within 24 hours by endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy (cutting the muscle at the duct opening) and stone removal or stent placement; drain sooner (within 6–12 hours) if the patient is in septic shock or not improving with fluids and antibiotics
·Percutaneous transhepatic biliary drainage (PTBD, a tube placed through the skin and liver into the bile duct under imaging guidance) if ERCP fails, cannot be done safely, or is not available
·Cholecystectomy (surgical removal of the gallbladder) 2–6 weeks after the acute infection is controlled, if gallstones caused the episode and the patient is healthy enough for surgery
·Vasopressors (norepinephrine, started at 0.05–0.1 mcg/kg/min and titrated to maintain mean arterial pressure above 65 mmHg) if blood pressure remains low despite intravenous fluids
·Supportive care (oxygen therapy, pain control with intravenous opioids such as morphine or fentanyl, monitoring in an intensive care unit if the patient has septic shock or organ failure)

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NCLEX trap

·Antibiotics slow the infection down for a short time, but they do NOT remove the blockage. Think of a clogged drain full of dirty water — adding soap will not unclog the pipe. The trapped, infected bile must be drained mechanically with ERCP (a tube with a camera that goes down your throat to reach the bile duct, then removes the stone, cuts the tight muscle at the duct opening, or places a small tube to hold the duct open) within 24 hours of diagnosis, or within 6-12 hours if the patient is in septic shock (Reynolds pentad: fever, yellow skin, right upper belly pain, dangerously low blood pressure, confusion). Without drainage, bacteria and their toxins keep leaking into the bloodstream, and the patient will die from sepsis (overwhelming infection in the blood) and multi-organ failure (kidneys, lungs, liver, and heart all stop working).
·Acute cholangitis requires Charcot triad: fever + right upper belly pain + yellowing of the skin and eyes (jaundice) (yellow skin and eyes from backed-up bile pigment). Fever means bacteria are growing inside the blocked bile duct. No fever means you have biliary obstruction (a blocked duct without infection) — not acute cholangitis. Once fever appears, infection has started, and sepsis can follow within hours.
·In acute cholangitis with septic shock, blood pressure drops because infected bile releases toxins (endotoxins from bacterial cell walls) that make blood vessels leak fluid out into the tissues — this is called distributive shock. The blood vessels are dilated (widened) and leaky, like a hose with holes. Give large-volume IV fluid resuscitation FIRST to refill the leaky vessels. Vasopressors are second-line — use them only if fluids alone do not restore adequate blood pressure and tissue blood flow (perfusion) (enough blood flow to deliver oxygen to organs).
·Acute cholangitis is a polymicrobial infection (caused by multiple types of bacteria living together in the bile duct). The bile duct harbors gram-negative rods (E. coli, Klebsiella, Enterobacter — these are the most common culprits), gram-positive cocci (Enterococcus), and anaerobes (Bacteroides, Clostridium — bacteria that grow without oxygen). Use broad-spectrum antibiotics that cover all three groups: piperacillin-tazobactam OR ceftriaxone plus metronidazole. After you get blood and bile culture results showing which exact bacteria are growing and which antibiotics they are sensitive to, you can narrow the coverage.
·Acute cholangitis can be caused by gallstones (most common — about 80%), benign biliary strictures (scar tissue that narrows the duct after surgery or chronic inflammation like primary sclerosing cholangitis), or malignant tumors (cholangiocarcinoma, which is cancer of the bile duct itself, or pancreatic cancer pressing on the duct from outside). Look at the ultrasound or CT scan for stones. Ask about prior ERCP or bile duct surgery (which can cause strictures). Look for masses. The cause determines the drainage method: stone extraction for gallstones, stent placement (a small tube to hold the duct open) for strictures or tumors.
·Acute cholangitis is a medical emergency. ERCP must be performed within 24 hours of diagnosis, and sooner (within 6-12 hours) if the patient has severe acute cholangitis with septic shock, dangerously low blood pressure, or confusion. This condition can deteriorate in hours into multi-organ failure and death. Every hour the infected bile stays trapped under pressure, more bacteria and toxins leak into the bloodstream. Stable right now does NOT mean stable in 6 hours.

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