Diagnostic Approach and Management for Acute Abdominal Pain with Suspected Cholangitis

Initial Clinical Assessment and Diagnostic Tests

The American College of Radiology recommends abdominal ultrasound as the first-line imaging modality for patients with acute abdominal pain and elevated liver enzymes suspected of having cholangitis, followed by CT or MRCP if initial imaging is inconclusive 1, 2
Laboratory tests should include full blood count, inflammatory markers, liver function tests, serum electrolytes, and renal function, as recommended by the World Journal of Emergency Surgery 3
Liver function tests, including ALT, AST, alkaline phosphatase, GGT, and bilirubin, should be performed, as recommended by the Journal of Hepatology 4
Serum albumin should be assessed to evaluate nutritional status and degree of inflammation, as recommended by the World Journal of Emergency Surgery 3

Abdominal ultrasound should be used to identify biliary dilatation, gallstones, and evidence of obstruction, as recommended by the Journal of the American College of Radiology and Clinical Infectious Diseases 5, 6, 7, 1
CT scan with IV contrast is recommended as the next imaging step if ultrasound is equivocal or non-diagnostic, as recommended by Clinical Infectious Diseases 6, 1
MRCP is preferred for suspected cholangitis if both ultrasound and CT are inconclusive, as recommended by Clinical Infectious Diseases and Journal of Hepatology 6, 8, 9, 4

Fluid resuscitation and correction of electrolyte abnormalities should be performed, as recommended by the Journal of the American College of Radiology 5
Empiric antibiotic therapy should be based on severity, with options including Amoxicillin/Clavulanate, Piperacillin/tazobactam, and Ertapenem or Eravacycline, as recommended by the World Journal of Emergency Surgery 10
Biliary decompression should be performed based on severity, with urgent decompression recommended for severe cases, early decompression for moderate cases, and observation for mild cases, as recommended by the Journal of the American College of Radiology 5
Endoscopic retrograde cholangiopancreatography (ERCP) with stent placement is the procedure of choice for biliary decompression, as recommended by the Journal of the American College of Radiology 5
Definitive management should address the underlying cause of obstruction, including cholecystectomy for gallstone disease, balloon dilatation for strictures, and stent placement and oncologic consultation for malignant obstruction, as recommended by the World Journal of Emergency Surgery and Journal of the American College of Radiology 10, 5

Delay in biliary decompression beyond 24 hours in moderate to severe cases is associated with increased mortality, as recommended by the Journal of the American College of Radiology 5
Antibiotics should be initiated within 1 hour of diagnosis for patients presenting with sepsis, as recommended by the Journal of the American College of Radiology 5