A 28-year-old woman is brought to the trauma bay after a stab wound to the right lower abdomen. On examination: BP 92/58 mmHg, HR 116 bpm, RR 22/min, and she is pale and anxious. Abdominal examination shows a single stab wound with minimal external bleeding; no peritoneal signs yet. FAST is positive for free fluid in the pelvis. Two large-bore IVs are placed and a 1 L normal saline bolus is infused. Repeat vital signs: BP 94/60 mmHg, HR 114 bpm. What is the next most appropriate step?

Explanation

## Clinical Scenario This patient has a **penetrating abdominal wound with hemodynamic instability** (BP 92/58, HR 116) and imaging evidence of intra-abdominal fluid (FAST positive). She has received an initial crystalloid bolus with minimal hemodynamic improvement—a **non-responder** to fluid resuscitation. ## Classification and Response | Shock Class | BP (mmHg) | HR (bpm) | Urine Output | Response to Fluids | Management | |---|---|---|---|---|---| | **Class I** | Normal | <100 | Normal | Excellent | Fluids | | **Class II** | Normal | 100–120 | Decreased | Good | Fluids | | **Class III** | Decreased | 120–140 | Minimal | Poor | **Fluids + Blood + OR** | | **Class IV** | Severely ↓ | >140 | Absent | Minimal | **Immediate OR** | **Key Point:** This patient is a **Class III/IV non-responder**. After one crystalloid bolus with no meaningful BP recovery, she requires: 1. **Blood transfusion** (activate massive transfusion protocol) 2. **Emergency laparotomy** (definitive hemorrhage control) ## Decision Algorithm ```mermaid flowchart TD A[Penetrating abdominal wound + Shock + FAST positive]:::outcome --> B[Establish 2 large-bore IVs]:::action B --> C[1 L crystalloid bolus]:::action C --> D{Hemodynamic response?}:::decision D -->|BP ↑ to >100, HR ↓| E[Observe + serial exams<br/>Consider CT/diagnostic lap]:::action D -->|Minimal/No response| F[Non-responder]:::urgent F --> G[Type O-neg blood + MTP]:::action G --> H[Emergency laparotomy]:::action H --> I[Hemorrhage control]:::outcome ``` **High-Yield:** In **penetrating trauma with shock**, a single crystalloid bolus that fails to restore hemodynamics signals ongoing hemorrhage beyond the reach of fluids. The next step is **blood transfusion and operative intervention**, not repeated fluid boluses or observation. **Clinical Pearl:** Penetrating abdominal wounds with peritoneal violation and shock are almost always surgical emergencies. FAST positivity in this context = intra-abdominal bleeding until proven otherwise. **Warning:** Observation or repeated fluids in a non-responder wastes critical time. Every minute of delay increases mortality in Class III/IV shock. Diagnostic laparoscopy may be considered in *stable* penetrating trauma to determine peritoneal violation; it is **contraindicated** in unstable patients. [cite:ATLS 10th Edition Ch 3; Sabiston Textbook of Surgery 21e Ch 20]