Incarcerated/strangulated hernias

Incarcerated/strangulated hernias

Incarcerated/strangulated hernias

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Definitions - When Guts Get Stuck

Incarcerated vs. Strangulated Hernia

  • Reducible: Hernia contents can be manually pushed back through the fascial defect.
  • Irreducible (Incarcerated): "Trapped." Hernia contents are stuck outside the abdominal wall; cannot be manually reduced. Often leads to bowel obstruction (pain, vomiting, constipation).
  • Strangulated: "Choked." An incarcerated hernia with compromised blood supply (ischemia → necrosis). Presents with intense, steady pain, fever, and erythema over the lump. A true surgical emergency.

⭐ Femoral hernias have the highest risk of strangulation.

Pathophysiology - The Vascular Squeeze

  • Incarceration: Irreducible trapping of hernia contents (e.g., bowel, omentum) at the hernia orifice. Blood flow is initially preserved.
  • Strangulation: A surgical emergency where vascular supply is compromised, leading to ischemia.
  • Progression from ischemia to necrosis can be rapid, often within 4-6 hours.

⭐ Femoral hernias carry the highest risk of strangulation (~15-20%), making them a high-priority surgical repair candidate. Direct inguinal hernias have the lowest risk.

Clinical Picture - Red Flags Flying

  • Incarceration: A previously reducible hernia becomes irreducible. Presents as a painful, tender bulge. May be associated with nausea, vomiting, and constipation, signaling early bowel obstruction.
  • Strangulation (Vascular Compromise): A surgical emergency where blood supply is cut off.
    • Local Signs (The "Angry Lump"):
      • Pain becomes severe, constant, and localized.
      • Overlying skin shows erythema, warmth, edema, or ecchymosis.
      • The hernia mass is tense and exquisitely tender.
    • Systemic Signs (Sepsis):
      • Fever (>38°C), tachycardia (>100 bpm), hypotension.
      • Labs: Leukocytosis (↑ WBC), metabolic acidosis (↑ lactate).

High-Yield: Pain out of proportion to exam findings is a classic sign of intestinal ischemia. Do not attempt forceful reduction if strangulation is suspected, as it can perforate gangrenous bowel.

Dx & Management - The Escape Plan

  • Clinical Dx: Tender, erythematous, non-reducible mass. Systemic signs (fever, tachycardia, ↑WBC, acidosis) suggest strangulation.
  • Imaging:
    • Ultrasound with Doppler: Initial choice to assess blood flow.
    • CT Scan: Confirms diagnosis, shows bowel wall thickening, edema, or free air.
  • Management Steps:
    • Pre-Op: NPO, IV access, fluid resuscitation, analgesia.
    • Antibiotics: Cover gram-negatives & anaerobes (e.g., Cefoxitin, Zosyn).

Exam Favorite: Never attempt manual reduction if strangulation is suspected. This risks perforating ischemic bowel or causing sepsis by returning non-viable tissue to the abdomen.

High‑Yield Points - ⚡ Biggest Takeaways

  • Incarceration is an irreducible hernia; strangulation adds vascular compromise, creating a surgical emergency.
  • Suspect strangulation with severe, steady pain, skin erythema, and systemic signs like fever or tachycardia.
  • Femoral hernias carry the highest risk of strangulation.
  • Diagnosis is mainly clinical; a CT scan can confirm bowel ischemia or obstruction.
  • Management requires immediate surgical exploration to prevent bowel necrosis and sepsis.
  • Never manually reduce a suspected strangulated hernia in the ED.

Practice Questions: Incarcerated/strangulated hernias

Test your understanding with these related questions

A 50-year-old male presents to the emergency with abdominal pain. He reports he has had abdominal pain associated with meals for several months and has been taking over the counter antacids as needed, but experienced significant worsening pain one hour ago in the epigastric region. The patient reports the pain radiating to his shoulders. Vital signs are T 38, HR 120, BP 100/60, RR 18, SpO2 98%. Physical exam reveals diffuse abdominal rigidity with rebound tenderness. Auscultation reveals hypoactive bowel sounds. Which of the following is the next best step in management?

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Flashcards: Incarcerated/strangulated hernias

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Paraesophageal hernias are associated with _____ in lung fields

TAP TO REVEAL ANSWER

Paraesophageal hernias are associated with _____ in lung fields

bowel sounds

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