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Acute Mesenteric Ischemia - Vascular Approach (WSES 2022)

Acute Mesenteric Ischemia - Vascular Approach (WSES 2022): Suspected Acute Mesenteric Ischemia → Clinical Recognition → Immediate Resuscitation → Etiolo...

Pathway Overview

17 steps

Algorithm Steps

17 total

  1. 01Start

    Suspected Acute Mesenteric Ischemia

    Sudden severe abdominal pain out of proportion to physical findings

  2. 02Action

    Clinical Recognition

    High index of suspicion essential

    • Pain out of proportion to examination
    • Sudden onset severe abdominal pain
    • Risk factors: AF, recent MI, CHF, atherosclerosis
    • GI emptying (vomiting, bloody diarrhea)
    • Peritonitis = late sign (transmural necrosis)
  3. 03Action

    Immediate Resuscitation

    Start in parallel with workup

    • IV fluid resuscitation (crystalloid)
    • Correct electrolytes/acidosis
    • Broad-spectrum antibiotics
    • NG decompression
    • Avoid vasoconstrictors if possible
    • ICU admission
  4. 04Decision

    Etiology Determination

    Guides treatment approach

    • Arterial embolism (~50%): AF, sudden onset, no prior symptoms
    • Arterial thrombosis (~25%): atherosclerosis, food fear, weight loss
    • Mesenteric venous thrombosis (~10%): hypercoagulable, portal HTN
    • NOMI (~15%): shock, vasoconstrictors, cardiac surgery
  5. 05Decision

    Peritonitis or Bowel Necrosis?

    Determines operative approach

    • Peritoneal signs
    • Pneumatosis on CT
    • Portal venous gas
    • Severe metabolic acidosis
    • Hemodynamic instability
  6. 06Warning

    Emergent Laparotomy

    Bowel necrosis requires surgical resection

    • Resect non-viable bowel
    • Assess viability: color, peristalsis, bleeding, fluorescence
    • Revascularization + resection same procedure
    • Damage control if unstable
    • PLAN FOR SECOND-LOOK at 24-48h
  7. 07Warning

    Second-Look Laparotomy

    MANDATORY at 24-48 hours

    • Assess bowel viability after reperfusion
    • Resect additional non-viable bowel
    • May need multiple returns to OR
    • Critical for survival
    • Plan at initial operation
  8. 08Action

    Post-Operative Care

    ICU management

    • ICU monitoring
    • Continue anticoagulation
    • Nutritional support (TPN initially)
    • Monitor for short bowel syndrome
    • Address underlying cause (AF, hypercoagulable)
  9. 09Outcome

    Survival

    Mortality 50-80% overall; early diagnosis critical

  10. 10Outcome

    Short Bowel Syndrome

    If extensive resection - may need long-term TPN, intestinal rehabilitation

  11. 11Action

    Open SMA Embolectomy

    First-line for arterial embolism

    • Transverse arteriotomy at SMA
    • Fogarty catheter embolectomy
    • Intraoperative angiography
    • Assess bowel viability after reperfusion
    • Patch angioplasty if needed
  12. Path rejoins step 07Shared downstream outcome
  13. 12Action

    Endovascular Revascularization

    Alternative for select patients

    • Catheter-directed thrombolysis
    • Mechanical thrombectomy
    • Angioplasty ± stenting
    • Best for thrombosis without necrosis
    • May combine with laparoscopy for bowel assessment
  14. Path rejoins step 08Shared downstream outcome
  15. 13Action

    Mesenteric Bypass

    For thrombosis with extensive disease

    • Aorto-SMA bypass (antegrade)
    • Iliac-SMA bypass (retrograde)
    • Vein or prosthetic conduit
    • Indicated for extensive atherosclerosis
    • Higher complexity, longer procedure
  16. Path rejoins step 07Shared downstream outcome
  17. 14Action

    MVT Treatment

    Venous thrombosis - anticoagulation primary

    • Systemic anticoagulation (UFH then LMWH/warfarin/DOAC)
    • Duration: 6 months minimum, often indefinite
    • Surgery only if bowel necrosis
    • Hypercoagulable workup
    • Catheter-directed thrombolysis if progressing
  18. Path rejoins step 08Shared downstream outcome
  19. 15Action

    NOMI Treatment

    Non-occlusive mesenteric ischemia

    • Treat underlying cause (shock, CHF)
    • STOP vasoconstrictors if possible
    • Optimize cardiac output
    • Intra-arterial papaverine (30-60 mg/hr)
    • Surgery only if necrosis develops
  20. Path rejoins step 08Shared downstream outcome
  21. 16Action

    Immediate Anticoagulation

    UFH unless contraindicated

    • Unfractionated heparin IV
    • Prevents thrombus propagation
    • Continue until definitive treatment
    • Contraindications: active bleeding, recent surgery
  22. 17Action

    CT Angiography

    Gold standard - sensitivity/specificity >95%

    • Arterial + portal venous phase
    • SMA filling defect or occlusion
    • Bowel wall changes (edema, pneumatosis)
    • Portal venous gas (late, ominous)
    • Do NOT delay if clinical suspicion high
  23. Path rejoins step 04Shared downstream outcome

Guideline Source

WSES 2022 Acute Mesenteric Ischemia Updated Guidelines

DOI: 10.1186/s13017-022-00443-xView Guideline

Clinical Safety Information

Clinical Decision Support — Not a Substitute for Clinical Judgment

Individual patient factors may require deviation from these recommendations.

Known Limitations

  • Mortality remains 50-80% even with optimal treatment
  • Time-critical: 6-hour golden window for revascularization
  • Requires multidisciplinary approach (vascular, GI surgery, ICU)
  • NOMI treatment differs from occlusive disease
  • Second-look laparotomy critical but resource-intensive

Applicable Regions

USEUGlobal

EU: ESVS 2017/2025 guidelines complement WSES

US: Management principles consistent with WSES

Version 1Next review: 2027-01-01

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Frequently Asked Questions

What is the Acute Mesenteric Ischemia - Vascular Approach (WSES 2022)?

The Acute Mesenteric Ischemia - Vascular Approach (WSES 2022) is a emergency clinical algorithm for Vascular Surgery. It provides a structured decision tree to guide clinical decision-making, based on WSES 2022 Acute Mesenteric Ischemia Updated Guidelines.

What guideline is the Acute Mesenteric Ischemia - Vascular Approach (WSES 2022) based on?

This algorithm is based on WSES 2022 Acute Mesenteric Ischemia Updated Guidelines (DOI: 10.1186/s13017-022-00443-x).

What are the limitations of the Acute Mesenteric Ischemia - Vascular Approach (WSES 2022)?

Known limitations include: Mortality remains 50-80% even with optimal treatment; Time-critical: 6-hour golden window for revascularization; Requires multidisciplinary approach (vascular, GI surgery, ICU); NOMI treatment differs from occlusive disease; Second-look laparotomy critical but resource-intensive. Individual patient factors may require deviation from these recommendations.

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