## Management of Penetrating Abdominal Trauma (Stable Patient) ### Clinical Context This patient has a **stable** penetrating abdominal wound below the arcuate line (below the level of the inferior epigastric vessels). The location is in the **lower abdomen**, which has a **lower risk of major vascular or solid organ injury** compared to the upper abdomen. No peritoneal signs are present. ### Why Local Wound Exploration? **Key Point:** In a **stable patient with penetrating abdominal trauma**, local wound exploration (LWE) under local anaesthesia is the **first-line diagnostic step** to determine whether the anterior fascia has been violated. 1. **Determines fascial penetration**: Violation of the anterior fascia indicates peritoneal penetration and mandates further evaluation or operative intervention. 2. **Rapid and cost-effective**: Can be performed at the bedside in the ED without delay. 3. **High sensitivity and specificity**: In experienced hands, LWE has >95% accuracy for detecting fascial penetration. 4. **Guides further management**: - If **fascia is NOT violated** → wound is superficial; manage conservatively with antibiotics, tetanus prophylaxis, and observation. - If **fascia IS violated** → proceed to imaging (CT) or operative exploration depending on clinical suspicion and findings. ### Algorithm for Penetrating Abdominal Trauma (Stable Patient) ```mermaid flowchart TD A[Penetrating abdominal wound<br/>Haemodynamically stable<br/>No peritoneal signs]:::outcome --> B[Local Wound Exploration<br/>under local anaesthesia]:::action B --> C{Anterior fascia<br/>penetrated?}:::decision C -->|No| D[Superficial wound<br/>Antibiotics + tetanus]:::action C -->|Yes| E[Peritoneal penetration<br/>confirmed]:::outcome E --> F{Signs of peritonitis<br/>or evisceration?}:::decision F -->|Yes| G[Emergency laparotomy]:::urgent F -->|No| H[CT abdomen/pelvis<br/>with IV contrast]:::action H --> I{Significant<br/>injury found?}:::decision I -->|Yes| J[Operative intervention]:::urgent I -->|No| K[Observe 24 hours<br/>Serial exams<br/>Analgesia, antibiotics]:::action D --> L[Discharge/Observe]:::outcome K --> L ``` ### High-Yield Facts **High-Yield:** Local wound exploration is the **gold standard first step** for all stable patients with penetrating abdominal trauma, regardless of location (upper or lower abdomen). **Key Point:** Approximately **30–50% of stab wounds** to the abdomen do NOT penetrate the peritoneum and can be managed non-operatively if fascial integrity is confirmed. **Clinical Pearl:** The **absence of peritoneal signs does NOT exclude intra-abdominal injury**. Serial examinations and imaging are essential if fascia is violated. **Mnemonic:** **STAB** = **S**tability (haemodynamic), **T**iming (early exploration), **A**nterior fascia (assess), **B**aseline exam (serial follow-up). ### Why Not the Other Options? | Option | Why Incorrect | |--------|---------------| | CT abdomen/pelvis first | CT is **not** the first step in a stable patient; it should follow positive LWE. Unnecessary imaging delays diagnosis and wastes resources. | | Admit for observation only | Observation without LWE risks missing fascial penetration and evolving peritonitis. LWE must be performed first to stratify risk. | | Diagnostic peritoneal lavage (DPL) | DPL is **obsolete** in modern trauma practice, replaced by FAST and CT. It is invasive, non-specific, and has been abandoned in favour of LWE and imaging. | ### When to Proceed Beyond LWE - **Positive LWE** (fascia violated) + **no peritoneal signs** → CT abdomen/pelvis with IV contrast to assess for solid organ injury, hollow viscus injury, or vascular injury. - **Positive LWE** + **peritoneal signs** (guarding, rigidity, rebound) → **Emergency laparotomy** without delay for imaging. - **Negative LWE** (fascia intact) → Manage as superficial wound; discharge with wound care, antibiotics, and tetanus prophylaxis. [cite:Park 26e Ch 12]
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