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General Surgery›Condition·Updated Jul 11, 2026·v1

Acute Cholecystitis

Acute cholecystitis is a common surgical emergency caused by gallstone-induced cystic duct obstruction, leading to chemical inflammation and secondary bacterial invasion. The Tokyo Guidelines 2018 severity grading (I-III) guides initial management: early laparoscopic cholecystectomy is the definitive treatment for all grades, ideally within 72 hours of symptom onset. Antibiotics are indicated only for moderate-to-severe disease; mild disease can be managed without them. The 'lethal triad' of acute cholecystitis, obesity, and steatohepatitis markedly increases bile duct injury risk, necessitating a low threshold for bailout subtotal cholecystectomy. Special populations, pregnancy, elderly, immunocompromised, require tailored approaches, but early surgery consistently improves outcomes. Percutaneous cholecystostomy is reserved for patients unfit for surgery, with interval cholecystectomy planned at 4-8 weeks. Overall, early laparoscopic cholecystectomy reduces morbidity, hospital stay, and costs, and is the standard of care.

High Evidence299 references·9,639 words·39 min read·v1
acute cholecystitisgallstoneslaparoscopic cholecystectomyTokyo Guidelinesbiliary surgerybile duct injurysubtotal cholecystectomypercutaneous cholecystostomypregnancyelderlyCOVID-19

Quick Reference

RxDrug of choiceFor moderate-to-severe acute cholecystitis: piperacillin-tazobactam 4.5 g IV q6h or ceftriaxone 2 g IV q24h plus metronidazole 500 mg IV q8h. For mild disease, antibiotics may be omitted per recent meta-analyses.
AltAlternativesCefazolin 1 g IV q8h (for mild-moderate); carbapenems (e.g., ertapenem 1 g IV q24h) for severe disease or high-risk patients; fluoroquinolones (e.g., levofloxacin 750 mg IV q24h) plus metronidazole if beta-lactam allergy.
⊘AvoidRoutine extended postoperative antibiotics in mild-to-moderate cholecystitis; non-dihydropyridine calcium channel blockers (diltiazem, verapamil) are not directly contraindicated but have no role; avoid persisting with laparoscopic dissection when critical view of safety cannot be achieved.
DxTest of choiceRight upper quadrant ultrasound (sensitivity 71%, specificity 85%) is the first-line imaging modality. If equivocal or complicated disease suspected, contrast-enhanced CT is preferred.
ScKey scoreTokyo Guidelines 2018 (TG18) severity grade (I-III) dictates initial management: Grade I → early cholecystectomy without antibiotics; Grade II → early cholecystectomy with antibiotics; Grade III → organ support then cholecystectomy. The AAST intraoperative grade (I-V) better predicts mortality and complications.
→When to referAll patients with suspected acute cholecystitis should be referred to a surgeon for consideration of early laparoscopic cholecystectomy. Refer to hepatobiliary specialist if bile duct injury is suspected or for complex biliary reconstructions. Refer to interventional radiology for percutaneous cholecystostomy if patient is not a surgical candidate.
Early laparoscopic cholecystectomy within 72 hours of symptom onset is the definitive treatment for acute cholecystitis. Antibiotics are indicated only for moderate-to-severe disease (Tokyo Grade II/III). In mild disease, antibiotics may be omitted. The Tokyo Guidelines 2018 severity grade guides the need for organ support, antibiotic choice, and urgency of source control. The 'lethal triad' of acute cholecystitis, obesity, and steatohepatitis increases bile duct injury risk 16-fold, mandating a low threshold for bailout subtotal cholecystectomy.
Acute cholecystitis is a common surgical emergency caused by cystic duct obstruction, most often from gallstones, and affects approximately 1-4% of people with known gallstones annually. Early laparoscopic cholecystectomy is the definitive treatment, with surgery within 72 hours of symptom onset reducing postoperative complications. The Tokyo Guidelines 2018 (TG18) provide a severity-based framework (Grades I-III) to guide resuscitation, antibiotic use, and timing of surgery. In mild (Grade I) disease, antibiotics may be safely omitted; in moderate-to-severe disease, prompt source control, either surgical or percutaneous, is critical to reduce morbidity and mortality.

Overview and Recommendations

Background

  • •Acute cholecystitis (AC) is an acute inflammation of the gallbladder, triggered in >90% of cases by cystic duct obstruction from a gallstone. The condition accounts for a substantial proportion of emergency surgical admissions worldwide, with an estimated 1-4% of people with gallstones developing AC annually. Untreated, it progresses to gangrene in up to 20% of cases, with perforation and sepsis carrying a mortality of 8%.
  • •Pathophysiology begins with a chemical injury: the impacted stone blocks bile outflow, raising intraluminal pressure and causing mucosal ischemia. Bile salts and phospholipase A2 generate lysolecithin, a detergent that disrupts the epithelial barrier. This is followed by a neutrophilic infiltrate and, later, secondary bacterial invasion, detected by PCR in 50% of bile samples despite only 19% positive by culture. The most common isolates are Escherichia coli, Klebsiella species, and Enterococcus.
  • •The Tokyo Guidelines 2018 (TG18) classify AC into three severity grades: Grade I (mild, no organ dysfunction), Grade II (moderate, marked local inflammation with WBC >18,000/μL, palpable mass, or duration >72 h), and Grade III (severe, with organ dysfunction including hypotension, respiratory failure, or DIC). The 2018 revision removed the previous 72-hour time limit for early cholecystectomy, expanding surgery to all grades within 7 days of symptom onset. The AAST intraoperative severity grading (I-V) outperforms TG18 for predicting mortality and complications.
  • •Key risk factors for AC include gallstones, obesity, metabolic syndrome, rapid weight loss, and sickle cell disease. The 'lethal triad' of acute cholecystitis, obesity (BMI ≥30), and steatohepatitis increases the risk of bile duct injury by 16-fold (OR 16.35). COVID-19 infection independently doubles the incidence of gangrenous cholecystitis (40.7% vs 22.3%) and raises mortality to 13.4% (OR 5.0). The ACME score identifies four independent mortality risk factors: COPD, dementia, age >80 years, and need for preoperative vasoactive amines (AUROC 0.88).

Evaluation

  • •Suspect acute cholecystitis in any patient presenting with acute right upper quadrant (RUQ) or epigastric pain, often radiating to the right shoulder or interscapular region, with nausea and vomiting. Fever is present in about one-third at presentation but develops in most within 24 hours. An antecedent history of biliary colic (postprandial pain lasting 30-90 minutes) is elicited in 60-80% of patients.
  • •Examine for Murphy sign, the most specific physical finding: the patient arrests inspiration when the examiner’s fingers press beneath the right costal margin during deep breath. Sensitivity ranges 65-97%, specificity 87-96%. Guarding or rebound tenderness suggests gangrenous or perforated cholecystitis. A palpable gallbladder (Courvoisier sign) is uncommon and should raise suspicion for gallbladder carcinoma or choledocholithiasis.
  • •Red flags for severe disease include systemic inflammatory response syndrome (SIRS) or sepsis, rebound tenderness or generalized peritonitis, jaundice (indicating choledocholithiasis or Mirizzi syndrome), and upper gastrointestinal bleeding (possible cystic artery pseudoaneurysm). In elderly, diabetic, or immunocompromised patients, atypical presentations with minimal pain or fever are common, a high index of suspicion and low-threshold imaging are essential.
  • •Order laboratory studies: complete blood count with differential, C-reactive protein (CRP), liver function tests (LFTs) including γ-glutamyl transferase (GGT), and lipase. A neutrophil count is an independent predictor of AC. The neutrophil-to-lymphocyte ratio (NLR) has high diagnostic accuracy (pooled DOR 2.257), but CRP is superior for assessing severity per Tokyo Guidelines. A GGT >224 IU/L has 80.6% sensitivity and 75.3% specificity for predicting coexisting common bile duct stones.
  • •Use the Tokyo Guidelines 2018 (TG18) diagnostic criteria: a definitive diagnosis requires one item from each of three axes, A) local signs (Murphy sign, RUQ mass/pain/tenderness), B) systemic signs (fever >37.5°C, elevated CRP, elevated WBC), and C) imaging findings (gallbladder wall thickening >4 mm, distention >8 cm long axis, pericholecystic fluid, sonographic Murphy sign). The TG18 criteria have 83.1% sensitivity but 37.5% specificity, so clinical judgment is essential.
  • •First-line imaging is RUQ ultrasound. Pooled sensitivity is 71% (95% CI 69-72%) and specificity 85% (95% CI 84-86%). Key sonographic findings include gallbladder wall thickening >4 mm, pericholecystic fluid, gallbladder distention, gallstones, and a sonographic Murphy sign. Surgeon-performed US has comparable diagnostic performance to radiologist-performed US (sensitivity 60% vs 80%, specificity 98.6% vs 97.8%). A cystic artery velocity cutoff ≥42.6 cm/s has a PPV of 77.3% for AC.
  • •If ultrasound is equivocal or complicated cholecystitis is suspected (e.g., severe pain, CRP >150 mg/L, suspicion of gangrene or emphysema), obtain contrast-enhanced CT. CT has lower sensitivity than US for AC (52.3% vs 79.4%) but higher specificity (92.3% vs 61.5%) and better detects complications like gangrenous, emphysematous, or perforated cholecystitis. If choledocholithiasis is suspected (elevated GGT, bilirubin, dilated CBD), order MRCP or ERCP.
  • •Consider alternative diagnoses: biliary colic (no systemic signs, normal imaging except gallstones), choledocholithiasis (jaundice, dilated CBD, abnormal LFTs), acute cholangitis (Charcot’s triad: fever, jaundice, RUQ pain), acute pancreatitis (epigastric pain radiating to back, elevated lipase), perforated peptic ulcer (peritonitis, free air on upright CXR), hepatitis (transaminitis, viral serology), right lower lobe pneumonia (respiratory symptoms, chest X-ray findings), Fitz-Hugh-Curtis syndrome (perihepatitis from PID), and gallbladder cancer (focal wall thickening, intraluminal mass, enlarged lymph nodes).
  • •Severity grade the patient using TG18: Grade I (mild) = no organ dysfunction, WBC ≤18,000/μL, CRP <10 mg/dL, no gallbladder necrosis or abscess; Grade II (moderate) = any of WBC >18,000/μL, palpable tender mass, duration >72 h, marked wall thickening, gangrenous changes; Grade III (severe) = organ dysfunction (hypotension, altered consciousness, respiratory failure, renal failure, DIC). This grade directly dictates initial management and urgency of source control.

Management

  • •Begin with initial resuscitation: intravenous crystalloid (balanced solution preferred), nil per os, and multimodal analgesia (e.g., NSAIDs with or without opioids). For Grade III (severe) cholecystitis or sepsis, admit to ICU and start early vasopressor support (norepinephrine) if MAP remains <65 mmHg after fluid resuscitation. COVID-19 infection warrants escalated monitoring for rapid progression to gangrenous cholecystitis.
  • •Administer antibiotics only for Grade II (moderate) and Grade III (severe) cholecystitis. For Grade I (mild), three meta-analyses and a large RCT (Park et al., N=370) show no benefit: postoperative infection rates 7.6% with antibiotics vs 7.0% with placebo (P=0.842). Therefore, antibiotics may be omitted in mild disease in otherwise healthy patients. For Grade II, use cefazolin 1 g IV q8h or a second-generation cephalosporin (e.g., cefoxitin 2 g IV q6h). For Grade III or septic shock, use piperacillin-tazobactam 4.5 g IV q6h or ceftriaxone 2 g IV q24h plus metronidazole 500 mg IV q8h.
  • •Postoperative antibiotics: for mild-to-moderate cholecystitis after adequate source control, antibiotics beyond 24 hours do not improve outcomes. After percutaneous cholecystostomy, antibiotics can be safely discontinued within 7 days. For severe disease, duration is guided by clinical response, typically 4-7 days. Blood and bile cultures, when obtained, guide de-escalation.
  • •Definitive source control is early laparoscopic cholecystectomy (LC). Perform LC within 72 hours of symptom onset, this window significantly reduces postoperative complications (RR 0.60, 95% CI 0.39-0.92). The ACDC trial (N=618) showed morbidity 11.8% with early surgery vs 34.4% with delayed surgery, shorter hospital stay (5.4 vs 10.0 days), and lower costs. Surgery within 48 hours of admission yields the best outcomes; delaying beyond 2 days increases mortality, complications, and cost incrementally.
  • •For Grade I and II cholecystitis, proceed directly to early laparoscopic cholecystectomy during the index admission. For Grade III, provide organ support (ICU, vasopressors, antibiotics) first, then perform surgery once organ dysfunction resolves, typically within 24-48 hours. The TG18 2018 revision removed the rigid 72-hour cutoff, allowing safe early cholecystectomy for all grades within 7 days of symptom onset.
  • •Intraoperatively, achieve the critical view of safety (CVS) before dividing any structures. If CVS cannot be obtained due to dense inflammation, perform a bailout procedure: subtotal cholecystectomy (STC) is preferred over conversion to open surgery. STC carries a very low bile duct injury (BDI) rate of 0.3% but a bile leak rate of 13.5%. Reconstituting STC (stump closure) yields fewer bile leaks than fenestrating STC. Conversion to open cholecystectomy carries the highest BDI rate (4.4% at 1 year).
  • •For patients who are not operative candidates (e.g., Tokyo III with severe comorbidities, cancer, frailty), consider percutaneous cholecystostomy (PC) or endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) with a lumen-apposing metal stent. PC achieves sepsis resolution in 81.7% within 72 hours but carries 30-day mortality of 7.8% and 1-year mortality of 25.2%. After PC, perform interval cholecystectomy at 4-8 weeks (early ≤1 month reduces complications, but delayed ≥8 weeks may improve discharge home).
  • •Antibiotic prophylaxis: for mild-to-moderate disease, a single preoperative dose of a broad-spectrum antibiotic (e.g., cefazolin 2000 mg) is sufficient. Extended postoperative antibiotics do not reduce surgical site infections (4% vs 4% with extended therapy, absolute difference 0.2%). Routine extended prophylaxis is not indicated.
  • •Special populations: In pregnancy, perform laparoscopic cholecystectomy regardless of trimester, it reduces adverse pregnancy outcomes (OR 0.60, 95% CI 0.42-0.87) and each day of delay increases fetal complications (OR 1.173, P<0.001). In elderly patients ≥80 years, early cholecystectomy reduces 1-year mortality (20.8% vs 27.1% with conservative management) despite higher 30-day mortality; laparoscopic approach is critical (84% relative risk reduction in 30-day mortality vs open). In immunocompromised patients (cancer, transplant), consider EUS-GBD as alternative to PC; in heart transplant recipients, cholecystectomy carries inpatient mortality 2.2% (higher if open or urgent).
  • •Monitor for resolution of SIRS criteria: temperature, heart rate, respiratory rate, WBC. If no improvement within 48 hours, reassess for inadequate source control (e.g., gangrenous cholecystitis, perforation, resistant organisms). For patients with PC, perform a check cholangiogram to detect common bile duct stones (present in 28.1%). After ERCP clearance of CBD stones, perform same-admission cholecystectomy within 7 days to prevent recurrent acute cholecystitis (risk of biliary events reaches 2.5% by 7 days and 53.3% at 1 year).
  • •Avoid routine intraoperative cholangiography solely to prevent BDI, it has not been shown to reduce BDI risk. Avoid non-dihydropyridine CCBs (diltiazem, verapamil) as they may exacerbate gallbladder stasis? Not directly relevant; avoid persisting with laparoscopic dissection when CVS cannot be achieved. Avoid extended postoperative antibiotics in mild-moderate disease. Refer to a hepatobiliary surgeon if BDI is suspected or for complex biliary reconstructions.

Board Review — High Yield

  • •Tokyo Guidelines 2018 severity grade, Grade I (mild): no organ dysfunction, WBC ≤18,000/μL, CRP <10 mg/dL; Grade II (moderate): WBC >18,000/μL, palpable mass, duration >72 h, or gangrenous changes; Grade III (severe): organ dysfunction (hypotension, respiratory failure, DIC). Grade directs management.
  • •Lethal triad, Acute cholecystitis + obesity (BMI ≥30) + steatohepatitis increases bile duct injury risk 16-fold (OR 16.35).
  • •ACDC trial, Early laparoscopic cholecystectomy (within 24 h of admission) vs delayed (7-45 days): morbidity 11.8% vs 34.4%, hospital stay 5.4 vs 10.0 days, costs lower. NNT to prevent one morbidity = 5.
  • •Bailout procedure, When critical view of safety cannot be achieved, subtotal cholecystectomy (STC) is preferred over conversion. STC BDI rate 0.3%, bile leak 13.5%. Reconstituting STC (closed stump) reduces bile leaks vs fenestrating.
  • •Antibiotics in mild disease, Multiple RCTs and meta-analyses show no benefit of antibiotics in Tokyo I cholecystitis. Single-dose prophylaxis is sufficient; extended antibiotics do not reduce infectious complications.
  • •Timing from symptom onset, Surgery within 72 hours of symptom onset reduces postoperative complications (RR 0.60). Surgery within 48 hours of admission yields best outcomes and lowest costs.
  • •Pregnancy, Laparoscopic cholecystectomy reduces adverse pregnancy outcomes (OR 0.60) regardless of trimester. Each day of delay increases fetal complications (OR 1.173). SAGES conditionally recommends surgery over nonoperative management.
  • •Gallbladder perforation, Occurs in up to 20% of untreated cases; risk factors: age >65, elevated CRP. Mortality 8%, conversion rate 22%, mean LOS 11.2 days. Most perforated cases have advanced inflammation (gangrene/empyema) on histology.
  • •Recurrence after conservative management, 22% of patients managed nonoperatively develop recurrent biliary events. After ERCP clearance of CBD stones, same-admission cholecystectomy within 7 days reduces recurrent AC (risk reaches 2.5% by 7 days, 53.3% at 1 year).
  • •COVID-19 and AC, COVID-19 infection independently doubles gangrenous cholecystitis incidence (40.7% vs 22.3%) and increases mortality 5-fold (OR 5.0). These patients warrant escalated monitoring and early source control.

Deep Dive — Evidence Details

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