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

Acute Appendicitis

Acute appendicitis is a common surgical emergency with a lifetime risk of 7%. The key to management is distinguishing uncomplicated from complicated disease using clinical scoring (AIR score) and imaging (CT, ultrasound, MRI). Laparoscopic appendectomy remains the standard for complicated appendicitis, while nonoperative management with antibiotics is a safe alternative for uncomplicated cases without risk factors for failure (appendicolith, diameter ≥15 mm, fever >38°C). In-hospital delays up to 24 hours are safe. Special populations (children, pregnant, elderly, immunocompromised) require tailored approaches. The risk of occult appendiceal neoplasia, especially after nonoperative management of complicated disease, mandates follow-up and consideration of interval appendectomy.

High Evidence369 references·10,099 words·41 min read·v1
acute appendicitisappendectomynonoperative managementAIR scoreappendicolithlaparoscopic surgerycomplicated appendicitis

Quick Reference

RxDrug of choicePiperacillin-tazobactam 4.5 g IV q6h (or ceftriaxone 2 g IV daily + metronidazole 500 mg IV q8h)
AltAlternativesErtapenem 1 g IV daily; oral moxifloxacin 400 mg daily for uncomplicated nonoperative management
⊘AvoidNonoperative management in patients with appendicolith, appendiceal diameter ≥15 mm, fever >38°C, or CRP ≥100 mg/L; avoid NSAIDs if renal impairment or bleeding risk
DxTest of choiceCT abdomen with IV contrast (low-dose if BMI <30) in adults; ultrasound in children and pregnancy; MRI in pregnancy if ultrasound inconclusive
ScKey scoreAppendicitis Inflammatory Response (AIR) score
→When to referComplicated appendicitis (gangrenous, perforated, abscess), failure of nonoperative management, elderly with comorbidities, pregnancy, immunocompromised patients
Acute appendicitis is diagnosed by clinical scoring (AIR) and imaging; laparoscopic appendectomy is definitive for complicated disease, while antibiotics are an option for uncomplicated cases without risk factors for failure (appendicolith, diameter ≥15 mm, fever >38°C).
Acute appendicitis is the most common abdominal surgical emergency, with a lifetime risk of approximately 7%. The key clinical distinction is between uncomplicated (simple, non-perforated) and complicated (gangrenous, perforated, or abscess) disease, which drives management decisions. Diagnosis relies on clinical scoring, the Appendicitis Inflammatory Response (AIR) score outperforms the Alvarado score, and targeted imaging (ultrasound in children/pregnancy, CT in adults). For uncomplicated appendicitis, nonoperative management with antibiotics is a safe alternative to appendectomy, though failure is predicted by appendicolith, appendiceal diameter ≥15 mm, and fever >38°C. Complicated appendicitis mandates urgent laparoscopic appendectomy with a short course of postoperative antibiotics. The paradigm has shifted from 'time is perforation' to recognizing that perforation is often a prehospital phenomenon, allowing safe in-hospital delays of up to 24 hours for uncomplicated cases.

Overview and Recommendations

Background

  • •Acute appendicitis is inflammation of the vermiform appendix, with a lifetime risk of 7-8% and an age- and sex-standardized incidence of 106 per 100,000 person-years in the United States. It is one of the most common abdominal emergencies worldwide, with a low mortality (<1%) but significant morbidity in complicated disease.
  • •The disease follows a two-disease model: uncomplicated (simple, non-perforated) appendicitis may be self-limiting and can resolve with antibiotics alone, while complicated (gangrenous, perforated, or abscess) appendicitis often perforates before the patient presents to care. Perforation rates do not increase with in-hospital delays up to 24 hours, challenging the traditional 'time is perforation' dogma.
  • •Pathophysiology begins with luminal obstruction, most commonly by a faecolith (35% of cases) or lymphoid hyperplasia, leading to increased intraluminal pressure, venous congestion, mucosal ischemia, and bacterial translocation (predominantly E. coli and B. fragilis). The histologic sequence progresses from suppurative to gangrenous to perforated appendicitis.
  • •Classification systems stratify severity: the AAST Anatomic Severity grade (I-V) predicts complication risk and resource utilization, while the WSES Comprehensive Grading (0-5) standardizes patient stratification. The presence of an appendicolith on CT is a key predictor of complicated disease and failure of nonoperative management (OR 1.99).
  • •Risk factors include low dietary fiber intake, age (peak incidence 10-19 years), male sex, and genetic heritability of 30%. Special populations, pregnancy (incidence reduced by 35%), elderly (higher perforation and mortality), and immunocompromised patients, require tailored approaches.
  • •Occult appendiceal neoplasms are found in 0.7-1.7% of appendectomy specimens, rising to 14.3% in patients with periappendicular abscess. This oncologic risk is a critical consideration when selecting nonoperative management, especially in patients >40 years.

Evaluation

  • •Suspect acute appendicitis in any patient with periumbilical pain that migrates to the right lower quadrant over 12-24 hours, accompanied by anorexia, nausea, and vomiting. The classic sequence is present in only half of patients; its absence does not exclude the diagnosis.
  • •Examine for localized tenderness at McBurney's point (one-third of the distance from the anterior superior iliac spine to the umbilicus), guarding, rebound tenderness, and the psoas sign (pain with hip extension) or obturator sign (pain with internal rotation of the flexed hip). Rovsing's sign (left lower quadrant palpation elicits right lower quadrant pain) suggests peritoneal irritation.
  • •Use the Appendicitis Inflammatory Response (AIR) score for risk stratification: it outperforms the Alvarado score (AUC 0.86 vs 0.79). At a cutoff >4 points, sensitivity is 91% for all appendicitis and 95% for advanced disease; at >8 points, specificity reaches 98%.
  • •Order laboratory studies: white blood cell count (sensitivity 62%, specificity 75%) and C-reactive protein (sensitivity 57%, specificity 87%). A CRP <100 mg/L within 24 hours of admission has a 99% negative predictive value for antibiotic treatment failure.
  • •In children and pregnant patients, obtain a right lower quadrant ultrasound as first-line imaging. Ultrasound has a pooled sensitivity of 69% and specificity of 81%; false-negative results are associated with Alvarado score ≥5, symptom duration >48 hours, and CRP ≥10 mg/L.
  • •In non-pregnant adults, obtain a CT abdomen with intravenous contrast (low-dose if BMI <30 kg/m²). CT has an accuracy of 98-99% for diagnosing appendicitis and can distinguish uncomplicated from complicated disease (accuracy 90.3% with low-dose CT).
  • •In pregnancy with inconclusive ultrasound, perform MRI (sensitivity 91.8%, specificity 97.9%). MRI is the preferred second-line imaging modality in this population.
  • •Follow a stepwise diagnostic algorithm: low-risk patients (AIR 0-4) may be observed or discharged with safety netting; intermediate-risk (AIR 5-8) require imaging; high-risk (AIR ≥9) can proceed to surgery without further imaging if the clinical picture is convincing.
  • •Also consider atypical presentations: retrocecal appendix (dull pain, positive psoas sign), pelvic appendix (suprapubic pain, tenesmus, positive obturator sign), and elderly patients (blunted pain, higher perforation rate). In immunocompromised patients, have a low threshold for cross-sectional imaging.
  • •Red flags for complicated disease include fever >38°C, tachycardia, hypotension, diffuse peritonitis, and the presence of an appendicolith on imaging. These features should prompt urgent surgical consultation.

Management

  • •Initiate intravenous fluid resuscitation with isotonic crystalloid (e.g., lactated Ringer's) at 20 mL/kg over 30-60 minutes if signs of hypoperfusion are present; otherwise, maintenance fluids at 1-2 mL/kg/h suffice.
  • •Provide analgesia: intravenous acetaminophen 1 g every 6 hours or ketorolac 30 mg IV once then 15 mg every 6 hours (avoid NSAIDs if renal impairment or bleeding risk). Add opioids (morphine 2-5 mg IV or fentanyl 25-50 μg IV) for breakthrough pain; adequate analgesia does not mask peritonitis.
  • •Start empiric broad-spectrum antibiotics covering gram-negative bacilli and anaerobes as soon as the diagnosis is confirmed. First-line regimens: piperacillin-tazobactam 4.5 g IV every 6 hours, or ceftriaxone 2 g IV daily plus metronidazole 500 mg IV every 8 hours.
  • •For uncomplicated appendicitis, a single preoperative dose of antibiotics is sufficient; postoperative continuation is not needed. For complicated appendicitis (gangrenous, perforated, abscess), continue antibiotics for 3-5 days postoperatively; longer courses do not reduce infectious complications.
  • •Consider nonoperative management with antibiotics alone for uncomplicated appendicitis in selected patients. Use ertapenem 1 g IV daily for 3 days followed by oral levofloxacin 500 mg daily plus metronidazole 500 mg three times daily for 7 days, or oral moxifloxacin 400 mg daily for 7 days (APPAC II regimen).
  • •Identify poor candidates for nonoperative management: appendicolith (OR 1.99 for failure), appendiceal diameter ≥15 mm (RR 4.00), body temperature >38°C (RR 2.76), and CRP ≥100 mg/L at 24 hours (RR 8.29). These patients should undergo appendectomy.
  • •Perform laparoscopic appendectomy as the standard operative approach for complicated appendicitis and for patients who prefer surgery. Laparoscopic appendectomy reduces wound infections, hospital stay, and recovery time compared to open surgery.
  • •For uncomplicated appendicitis, appendectomy can be safely delayed up to 24 hours from presentation; in-hospital delay does not increase perforation risk. For complicated appendicitis, proceed expeditiously.
  • •Secure the appendiceal stump with suture ligation or a stapler; both are superior to endoloops or clips for preventing organ/space infection. Use a specimen retrieval bag to minimize wound contamination.
  • •Manage peritoneal contamination with suction alone; peritoneal irrigation does not reduce intra-abdominal abscess and prolongs operative time. Avoid routine abdominal drainage.
  • •For patients managed nonoperatively, monitor vital signs and pain every 4 hours. Repeat CRP at 24 hours; a level <100 mg/L predicts success. Clinical deterioration (worsening pain, fever, peritonitis) requires urgent surgical consultation.
  • •Discharge criteria: tolerating oral intake, afebrile, pain controlled on oral analgesics. Same-day discharge is safe for uncomplicated appendicitis after laparoscopic appendectomy (PENDI-CSI trial: 85.9% discharged without admission, no increase in complications).
  • •Avoid routine preoperative blood cultures in hemodynamically stable patients (yield <4%). Avoid intraoperative antibiotic wound irrigation. Avoid postoperative antibiotics beyond 24 hours for uncomplicated appendicitis after appendectomy.
  • •Refer patients with complicated appendicitis and abscess for percutaneous drainage if feasible. Refer elderly or high-risk patients to ICU if septic shock develops. Discuss interval appendectomy with all patients after nonoperative management of complicated disease due to the 14.3% risk of occult neoplasia.
  • •In pregnancy, laparoscopic appendectomy is safe until the 20th week; beyond that, base the approach on surgeon expertise. Nonoperative management is acceptable for uncomplicated cases, with a fetal loss rate of 4% (vs 5% with surgery).

Board Review — High Yield

  • •McBurney's point, one-third of the distance from the anterior superior iliac spine to the umbilicus; site of maximal tenderness in acute appendicitis.
  • •AIR score, outperforms Alvarado; AUC 0.86 for all appendicitis, 0.93 for advanced; >8 points has 98% specificity.
  • •Two-disease model, perforation is often a prehospital phenomenon; in-hospital delay up to 24 hours does not increase perforation risk.
  • •Appendicolith, present in 35% of cases; doubles risk of antibiotic failure (OR 1.99); associated with complicated disease.
  • •Nonoperative management, 1-year success ~65%; 10-year recurrence ~38%; risk factors: appendicolith, diameter ≥15 mm, fever >38°C, CRP ≥100 mg/L.
  • •Laparoscopic appendectomy, standard of care; reduces wound infections, hospital stay, and recovery time vs open.
  • •Pregnancy, MRI is imaging of choice (sensitivity 92%, specificity 98%); laparoscopic appendectomy safe until 20 weeks; fetal loss rate 4-5%.
  • •Elderly, higher perforation rate (40%); nonoperative management increases mortality by 1.8% compared to surgery.
  • •Occult neoplasm, 1.6% of appendectomy specimens; 14.3% in periappendicular abscess; consider interval colonoscopy in patients >40 years.
  • •Stump appendicitis, rare (0.15%) but can occur years later; treat with completion appendectomy.

Deep Dive — Evidence Details

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