## Clinical Context This patient is **haemodynamically stable** with a positive FAST (free fluid) but **stable vital signs** and **non-progressive findings** on repeat FAST. The key distinction in abdominal trauma management is separating **unstable patients requiring immediate laparotomy** from **stable patients who can tolerate further investigation**. ## Management Algorithm for Blunt Abdominal Trauma ```mermaid flowchart TD A[Blunt abdominal trauma]:::outcome --> B{Haemodynamically stable?}:::decision B -->|No, unstable| C[Immediate exploratory laparotomy]:::urgent B -->|Yes, stable| D{FAST positive?}:::decision D -->|No| E[Clinical observation + serial exam]:::action D -->|Yes| F{Peritoneal signs or deterioration?}:::decision F -->|Yes| C F -->|No| G[CT abdomen/pelvis with IV contrast]:::action G --> H[Determine organ injury + conservative vs operative management]:::outcome ``` ## Rationale for CT Imaging in Stable Patients **Key Point:** In haemodynamically **stable** patients with a positive FAST, CT scan with IV contrast is the gold standard for: - Identifying the organ injured (spleen, kidney, liver, bowel) - Grading the injury severity - Detecting active bleeding (arterial blush) - Guiding conservative (non-operative) management vs. operative intervention **High-Yield:** FAST is a **screening tool** for free fluid, not a diagnostic tool for organ injury. A positive FAST in a stable patient mandates further imaging to characterize the injury. **Clinical Pearl:** The absence of **peritoneal signs** (guarding, rigidity, rebound) and **haemodynamic stability** indicate the patient can safely tolerate the time required for CT imaging. Most blunt splenic and renal injuries in stable patients are now managed non-operatively with bed rest, ICU/HDU monitoring, and serial imaging. ## Why Not Immediate Laparotomy? Immediate laparotomy is reserved for **unstable patients** (persistent hypotension, tachycardia, peritoneal signs) or those with **clinical deterioration**. Performing unnecessary laparotomy in a stable patient increases morbidity (adhesions, infection, unnecessary organ resection). ## Why Not DPL? DPL has been **largely replaced by FAST** in modern trauma protocols. FAST is non-invasive, repeatable, and does not require peritoneal puncture. DPL is rarely used in contemporary practice. ## Why Not Serial FAST Observation Alone? While serial clinical examination is important, a **positive FAST in a stable patient requires characterization** of the injury. Observation alone without imaging risks missing evolving injury or delayed bleeding that may require intervention. 
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