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Emergency and acute medicine – acute cholangitis
Overview and pathophysiology
Acute cholangitis is a purulent infection of the biliary tree that develops when there is partial or complete obstruction of the common bile duct. Obstruction may be caused by gallstones, tumors, cysts, or strictures, leading to increased intraluminal pressure and bacterial overgrowth. This process commonly results in bacteremia and sepsis and may extend to involve the liver and gallbladder. Mirizzi syndrome refers to bile duct obstruction caused by extrinsic compression from gallbladder or cystic duct stones or edema.
Causative factors
Infection typically arises from ascending bacteria originating in the duodenum, gallbladder infection, portal venous seeding, hematogenous spread with hepatic secretion, or lymphatic spread. Common organisms include intestinal coliforms such as Escherichia coli, Enterococcus species, and anaerobes including Bacteroides and Clostridium. In patients with AIDS, sclerosing cholangitis may occur, characterized by papillary stenosis, sclerosing cholangitis, and extrahepatic biliary obstruction; organisms such as cytomegalovirus, Cryptosporidium, and microsporidia are frequently isolated, although their exact causal role remains uncertain.
Clinical presentation
The classic presentation is Charcot triad, consisting of fever with chills, right upper quadrant abdominal pain, and jaundice, although all three features are present in only about half of patients. Progression to hypotension and altered mental status indicates severe biliary sepsis, known as Reynolds pentad. Abdominal pain is present in most patients and usually localizes to the right upper quadrant. Fever is common, while clinically apparent jaundice may be absent in a significant proportion of cases. In AIDS-related cholangitis, symptoms tend to be more indolent, with relatively normal bilirubin levels.
Initial evaluation
Early evaluation should include assessment for sepsis and organ dysfunction. Recommended studies include complete blood count, liver function tests, amylase and lipase, urinalysis, blood cultures, and electrocardiography in patients at risk for cardiac disease. Right upper quadrant ultrasound is the initial imaging study of choice to assess for biliary dilation and gallstones, with hepatobiliary scintigraphy considered when ultrasound findings are inconclusive.
Laboratory and imaging findings
Laboratory testing typically demonstrates leukocytosis with a left shift, unless the patient is immunocompromised or in advanced sepsis. Liver function tests show a cholestatic pattern with elevated direct bilirubin and alkaline phosphatase, while transaminase elevations are usually mild. Amylase and lipase are normal or only slightly elevated. Ultrasound helps identify the level of obstruction and gallstone etiology. Hepatobiliary scintigraphy is sensitive early in the disease before ductal dilation develops. CT imaging may assist in excluding alternative diagnoses. MR cholangiopancreatography is highly accurate but generally unnecessary if therapeutic ERCP is planned.
Differential considerations
Conditions that may mimic cholangitis include acute cholecystitis, hepatitis, hepatic abscess, acute pancreatitis, right-sided pyelonephritis, right lower lobe pneumonia or pulmonary embolism, perforated peptic ulcer, appendicitis, and sepsis with nonspecific liver enzyme elevation.
Early management
Initial management focuses on aggressive treatment of sepsis. Prompt intravenous fluid resuscitation is essential to correct dehydration and hemodynamic compromise. Most patients show clinical improvement within the first 24 hours of appropriate antibiotic therapy. Vasopressors may be required for hypotension refractory to fluids.
Emergency department treatment
Broad-spectrum intravenous antibiotics should be initiated early to cover gram-negative coliforms, anaerobes, and Enterococcus. Acceptable regimens include beta-lactam/beta-lactamase inhibitor combinations, carbapenems, or combination therapy with an aminoglycoside. Alternative regimens should be used in patients with penicillin allergy or renal insufficiency. Patients should be kept nil per os, with nasogastric decompression if vomiting or ileus is present. Analgesia and antiemetics may be provided once hemodynamic stability is ensured. Early gastroenterology and surgical consultation is mandatory. If there is no clinical response within 12–24 hours, urgent biliary decompression via ERCP, percutaneous drainage, or surgery is required.
Disposition and follow-up
All patients with acute cholangitis require hospital admission, with intensive care unit placement for those with septic shock or organ failure. There are no criteria for emergency department discharge. Definitive management involves continued intravenous antibiotics and timely biliary drainage when indicated.
Key clinical points
Acute cholangitis is a medical emergency with high risk of sepsis. Early recognition, aggressive fluid resuscitation, prompt administration of broad-spectrum antibiotics, and rapid consultation for biliary drainage are critical to improving outcomes.
Overview and pathophysiology
Acute cholangitis is a purulent infection of the biliary tree that develops when there is partial or complete obstruction of the common bile duct. Obstruction may be caused by gallstones, tumors, cysts, or strictures, leading to increased intraluminal pressure and bacterial overgrowth. This process commonly results in bacteremia and sepsis and may extend to involve the liver and gallbladder. Mirizzi syndrome refers to bile duct obstruction caused by extrinsic compression from gallbladder or cystic duct stones or edema.
Causative factors
Infection typically arises from ascending bacteria originating in the duodenum, gallbladder infection, portal venous seeding, hematogenous spread with hepatic secretion, or lymphatic spread. Common organisms include intestinal coliforms such as Escherichia coli, Enterococcus species, and anaerobes including Bacteroides and Clostridium. In patients with AIDS, sclerosing cholangitis may occur, characterized by papillary stenosis, sclerosing cholangitis, and extrahepatic biliary obstruction; organisms such as cytomegalovirus, Cryptosporidium, and microsporidia are frequently isolated, although their exact causal role remains uncertain.
Clinical presentation
The classic presentation is Charcot triad, consisting of fever with chills, right upper quadrant abdominal pain, and jaundice, although all three features are present in only about half of patients. Progression to hypotension and altered mental status indicates severe biliary sepsis, known as Reynolds pentad. Abdominal pain is present in most patients and usually localizes to the right upper quadrant. Fever is common, while clinically apparent jaundice may be absent in a significant proportion of cases. In AIDS-related cholangitis, symptoms tend to be more indolent, with relatively normal bilirubin levels.
Initial evaluation
Early evaluation should include assessment for sepsis and organ dysfunction. Recommended studies include complete blood count, liver function tests, amylase and lipase, urinalysis, blood cultures, and electrocardiography in patients at risk for cardiac disease. Right upper quadrant ultrasound is the initial imaging study of choice to assess for biliary dilation and gallstones, with hepatobiliary scintigraphy considered when ultrasound findings are inconclusive.
Laboratory and imaging findings
Laboratory testing typically demonstrates leukocytosis with a left shift, unless the patient is immunocompromised or in advanced sepsis. Liver function tests show a cholestatic pattern with elevated direct bilirubin and alkaline phosphatase, while transaminase elevations are usually mild. Amylase and lipase are normal or only slightly elevated. Ultrasound helps identify the level of obstruction and gallstone etiology. Hepatobiliary scintigraphy is sensitive early in the disease before ductal dilation develops. CT imaging may assist in excluding alternative diagnoses. MR cholangiopancreatography is highly accurate but generally unnecessary if therapeutic ERCP is planned.
Differential considerations
Conditions that may mimic cholangitis include acute cholecystitis, hepatitis, hepatic abscess, acute pancreatitis, right-sided pyelonephritis, right lower lobe pneumonia or pulmonary embolism, perforated peptic ulcer, appendicitis, and sepsis with nonspecific liver enzyme elevation.
Early management
Initial management focuses on aggressive treatment of sepsis. Prompt intravenous fluid resuscitation is essential to correct dehydration and hemodynamic compromise. Most patients show clinical improvement within the first 24 hours of appropriate antibiotic therapy. Vasopressors may be required for hypotension refractory to fluids.
Emergency department treatment
Broad-spectrum intravenous antibiotics should be initiated early to cover gram-negative coliforms, anaerobes, and Enterococcus. Acceptable regimens include beta-lactam/beta-lactamase inhibitor combinations, carbapenems, or combination therapy with an aminoglycoside. Alternative regimens should be used in patients with penicillin allergy or renal insufficiency. Patients should be kept nil per os, with nasogastric decompression if vomiting or ileus is present. Analgesia and antiemetics may be provided once hemodynamic stability is ensured. Early gastroenterology and surgical consultation is mandatory. If there is no clinical response within 12–24 hours, urgent biliary decompression via ERCP, percutaneous drainage, or surgery is required.
Disposition and follow-up
All patients with acute cholangitis require hospital admission, with intensive care unit placement for those with septic shock or organ failure. There are no criteria for emergency department discharge. Definitive management involves continued intravenous antibiotics and timely biliary drainage when indicated.
Key clinical points
Acute cholangitis is a medical emergency with high risk of sepsis. Early recognition, aggressive fluid resuscitation, prompt administration of broad-spectrum antibiotics, and rapid consultation for biliary drainage are critical to improving outcomes.
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