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General SurgeryDiagnostic

Acute Surgical Abdomen Evaluation

Acute Surgical Abdomen Evaluation: Patient with Acute Abdominal Pain → Initial Stabilization & Assessment → Focused Physical Examination → Signs of Peri...

Pathway Overview

16 steps

Algorithm Steps

16 total

  1. 01Start

    Patient with Acute Abdominal Pain

    New-onset or acute worsening of abdominal pain requiring evaluation. Goal: Determine if surgical intervention needed and how urgently.

  2. 02Action

    Initial Stabilization & Assessment

    1) ABCs - ensure hemodynamic stability. 2) IV access, fluid resuscitation if needed. 3) Pain control (does NOT mask surgical findings). 4) NPO. 5) Labs: CBC, BMP, LFTs, lipase, lactate, UA, pregnancy test. 6) Type & Screen if surgery possible.

  3. 03Action

    Focused Physical Examination

    INSPECT: Distension, scars, visible peristalsis, hernias. AUSCULTATE: Bowel sounds (absent, high-pitched). PERCUSS: Tympany (obstruction), dullness (fluid). PALPATE: Guarding, rigidity, rebound, masses. Check: Hernial orifices, genitalia (males), rectal exam.

  4. 04Decision

    Signs of Peritonitis?

    PERITONITIS: Involuntary guarding, board-like rigidity, diffuse rebound tenderness, absent bowel sounds, patient lying still (any movement hurts). If generalized peritonitis present → Immediate surgical consultation.

  5. 05Warning

    ⚠️ Atypical Presentations

    ELDERLY: Diminished pain, delayed presentation, may lack classic signs even with perforation. IMMUNOCOMPROMISED: Blunted inflammatory response. OPIOID USE: Masked symptoms. OBESITY: Difficult exam. Lower threshold for imaging in these populations.

  6. 06Action

    Immediate Surgical Consultation

    Generalized peritonitis = surgical emergency. Rapid imaging (may skip if unstable). Resuscitate en route to OR. Exploratory laparotomy. Common causes: Perforated viscus, mesenteric ischemia, ruptured AAA, strangulated bowel.

  7. 07Action

    Surgical Planning

    EMERGENT (<1h): Perforation with peritonitis, ruptured AAA, mesenteric ischemia. URGENT (1-6h): Appendicitis, cholecystitis with sepsis, bowel obstruction with strangulation. SEMI-ELECTIVE (6-24h): Uncomplicated appendicitis, cholecystitis, some diverticulitis. Consider: Patient optimization, antibiotic timing, surgical approach.

  8. 08Outcome

    Proceed to Surgery

    Surgical intervention indicated. Appropriate timing based on urgency. Continue resuscitation perioperatively.

  9. 09Action

    Focused Imaging

    CT abdomen/pelvis with IV contrast: Gold standard for most acute abdominal presentations. Identifies: Free air, obstruction, appendicitis, diverticulitis, cholecystitis, AAA, etc. ALTERNATIVES: US for biliary (RUQ pain), pelvic (female), AAA screening. Plain X-ray: Free air (erect CXR), obstruction (bowel gas pattern).

  10. 10Decision

    Key Imaging Findings?

    FREE AIR: Perforation - needs surgery. OBSTRUCTION: SBO/LBO - often surgical. ISCHEMIA: Mesenteric ischemia - emergency surgery. CONTAINED: Appendicitis, cholecystitis, diverticulitis - often surgical. VASCULAR: AAA rupture/leak - emergency vascular surgery.

  11. 11Action

    Free Air = Perforation

    Free intraperitoneal air = perforated hollow viscus. Sources: Peptic ulcer, diverticulitis, appendix, colon cancer, trauma. Requires exploration (laparoscopic or open). Identify source, repair, washout.

  12. Path rejoins step 07Shared downstream outcome
  13. 12Action

    Bowel Obstruction

    SBO: Consider trial of conservative management if partial, no strangulation signs. Surgery if complete, closed-loop, ischemia, or fails to improve. LBO: Usually requires intervention - see specific algorithms. Assess for strangulation (closed loop, mesenteric edema, decreased enhancement).

  14. Path rejoins step 07Shared downstream outcome
  15. 13Action

    Contained Inflammatory Process

    APPENDICITIS: Usually appendectomy (lap or open). CHOLECYSTITIS: Lap cholecystectomy (see TG18). DIVERTICULITIS: Grade-dependent (see WSES algorithm). May be medical vs. surgical.

  16. Path rejoins step 07Shared downstream outcome
  17. 14Action

    Vascular Emergency

    AAA RUPTURE: Massive resuscitation, permissive hypotension, emergent OR (EVAR vs open). MESENTERIC ISCHEMIA: Revascularization (endovascular or open) + second-look laparotomy. Time-critical.

  18. Path rejoins step 07Shared downstream outcome
  19. 15Action

    Non-Surgical Management

    Some conditions managed medically: Uncomplicated diverticulitis, partial SBO (adhesive), gastroenteritis, pancreatitis (initially). Close monitoring. Clear criteria for failure → escalation to surgery.

  20. 16Outcome

    Observation/Medical Management

    Surgery not immediately indicated. Serial exams. Clear parameters for surgical consultation if deteriorates.

Guideline Source

Contemporary Surgical Practice - Acute Abdomen Evaluation

DOI: N/A - Consensus Practice

Clinical Safety Information

Clinical Decision Support — Not a Substitute for Clinical Judgment

Individual patient factors may require deviation from these recommendations.

Known Limitations

  • Algorithm provides framework - clinical judgment essential
  • Atypical presentations common in elderly and immunocompromised
  • Pediatric acute abdomen has different differential
  • Pregnancy modifies approach significantly
  • Some conditions overlap categories

Applicable Regions

USEUGlobal

Global: Principles apply universally

Version 1Next review: 2028-01-01

Related General Surgery Pathways

Abdominal Compartment Syndrome Management (WSACS 2013)

Emergency

Acute Cholecystitis Management (TG18 2018)

Emergency

Acute Complicated Diverticulitis - Surgical Management (WSES 2020)

Emergency

Damage Control Surgery Principles (WSES 2018)

Emergency

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Frequently Asked Questions

What is the Acute Surgical Abdomen Evaluation?

The Acute Surgical Abdomen Evaluation is a diagnostic clinical algorithm for General Surgery. It provides a structured decision tree to guide clinical decision-making, based on Contemporary Surgical Practice - Acute Abdomen Evaluation.

What guideline is the Acute Surgical Abdomen Evaluation based on?

This algorithm is based on Contemporary Surgical Practice - Acute Abdomen Evaluation (DOI: N/A - Consensus Practice).

What are the limitations of the Acute Surgical Abdomen Evaluation?

Known limitations include: Algorithm provides framework - clinical judgment essential; Atypical presentations common in elderly and immunocompromised; Pediatric acute abdomen has different differential; Pregnancy modifies approach significantly; Some conditions overlap categories. Individual patient factors may require deviation from these recommendations.

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