Biliary Colic Diagnosis and Management

Characterization of Biliary Colic

• Biliary colic is characterized by severe, steady pain located in the epigastrium and/or right upper quadrant, with sudden onset, often at night, and duration of 1-5 hours, not typically relieved by position changes, household remedies, or gas passage, according to the American College of Physicians 1
• Biliary colic pain is not typically induced by fatty meals, and may radiate to the upper back, often accompanied by nausea or vomiting, although this is not a definitive symptom, as noted by the American College of Physicians 1

Differential Diagnosis

• Symptoms not attributable to gallstones include belching, bloating, intolerance of fatty foods, chronic pain, and dyspeptic symptoms, with a strength of evidence based on clinical observations, as stated by the American College of Physicians 1
• Many patients with gallstones, up to 80%, are asymptomatic and remain unaware of their presence, highlighting the importance of differential diagnosis, as reported by the American College of Physicians 1

Clinical Presentation and Diagnosis

• The first episode of biliary pain can be mistaken for a heart attack or other abdominal catastrophe, emphasizing the need for careful evaluation, as noted by the American College of Physicians 1
• Ultrasound should be the initial imaging modality for diagnosing acute cholecystitis, with CT as the next step if ultrasound is equivocal, followed by MRCP or HIDA scan if further imaging is needed, as recommended by the American College of Radiology 2, 3
• The American College of Radiology recommends using either ultrasound or MRI/MRCP as initial imaging, and avoiding CT due to radiation exposure, with a strength of evidence of moderate to high 2, 3
• MRCP is preferred in pregnant patients, along with ultrasound, due to its clearer picture of surrounding structures and no radiation exposure, with an accuracy >90% for detecting bile duct stones 2, 3
• HIDA scan is considered the gold standard for diagnosing acute cholecystitis, with a sensitivity of 86.7-89.3% and specificity of 66.8-79%, as suggested by the Infectious Diseases Society of America and World Society of Emergency Surgery guidelines 2, 4

• The HIDA scan protocol involves:

  Step	Description
  1	Injecting HIDA radiotracer intravenously with the patient supine
  2	Obtaining imaging up to 60 minutes to assess for gallbladder visualization
  3	Administering 0.04 mg/kg morphine intravenously if the gallbladder is not visualized by 60 minutes
  4	Continuing imaging for an additional 30 minutes after morphine administration, as recommended by the Clinical Gastroenterology and Hepatology guidelines and the World Society of Emergency Surgery guidelines [4, 5, 6]

Risk Stratification

• Patients should be stratified into three risk categories based on clinical presentation, laboratory findings, and initial imaging, with characteristics including normal liver enzymes, abnormal liver enzymes, and presence of CBD stone on ultrasound, and probabilities of CBD stones ranging from <10% to >50%, as recommended by the World Journal of Emergency Surgery guidelines 7, 4
• The risk categories are:

Management of Acute Cholecystitis

• Early laparoscopic cholecystectomy (within 7-10 days of symptom onset) is the preferred approach for managing acute cholecystitis, according to the International Journal of Infectious Diseases and the World Journal of Emergency Surgery guidelines, with a strength of evidence of high 8, 9
• Delaying surgery beyond 10 days may increase the risk of complications, but may be considered if there are no signs of worsening peritonitis or sepsis, as recommended by the World Journal of Emergency Surgery guidelines 8
• Patients with suspected acute cholecystitis should receive NPO, IV fluid resuscitation, electrolyte correction, pain control, and antibiotic therapy, as recommended by the World Journal of Emergency Surgery and Gastroenterology guidelines, with a strength of evidence of moderate to high 9, 10
• For non-critically ill, immunocompetent patients, Amoxicillin/Clavulanate 2g/0.2g q8h or Eravacycline 1 mg/kg q12h are recommended antibiotic options, according to the World Journal of Emergency Surgery guidelines, with a strength of evidence of moderate to high 9
• For critically ill or immunocompromised patients, Piperacillin/tazobactam 6 g/0.75 g LD then 4 g/0.5 g q6h or Eravacycline 1 mg/kg q12h are recommended antibiotic options, as per the World Journal of Emergency Surgery guidelines, with a strength of evidence of moderate to high 9

Special Considerations

• Early surgical consultation should be considered in patients with suspected acute cholecystitis, even with equivocal physical findings, due to the higher risk of complications, as recommended by the World Society of Emergency Surgery guidelines, with a strength of evidence of moderate to high 4
• Percutaneous cholecystostomy may be considered as a bridge to intervention when surgery is high-risk or contraindicated, with continuation of antibiotics for 4 days after drainage, according to the World Journal of Emergency Surgery guidelines, with a strength of evidence of moderate to high 9
• ERCP with sphincterotomy is the gold standard for therapeutic management of choledocholithiasis, with a success rate of approximately 93% and a complication rate of approximately 11.7%, and should be performed within 24-72 hours of admission for patients with cholangitis or severe symptoms, with antibiotic therapy indicated for patients with cholangitis or evidence of infection, as recommended by the American College of Gastroenterology, with a strength of evidence of high 7
• Delayed treatment of acute cholecystitis with pericholecystic stranding increases the risk of complications, and prompt intervention is recommended, as emphasized by the World Society of Emergency Surgery guidelines and the IDSA guidelines, with a strength of evidence of high 8, 4, 11, 2