A 32-year-old man is brought to the emergency department following a motor vehicle collision. He was the driver and struck a tree at high speed. On arrival, his blood pressure is 88/54 mmHg, heart rate 128 bpm, respiratory rate 24/min, and he is anxious and restless. Skin is cold and clammy. Abdominal examination reveals distension and tenderness in the left upper quadrant with rebound tenderness. FAST scan shows free fluid in the peritoneal cavity. Hemoglobin is 9.2 g/dL (baseline 14.5 g/dL). What is the most appropriate immediate management?

Explanation

## Clinical Assessment This patient presents with **Class III hemorrhagic shock** (SBP 88 mmHg, HR 128, altered mental status, cold extremities) secondary to blunt abdominal trauma with suspected splenic injury (left upper quadrant tenderness, free fluid on FAST). ## Hemorrhagic Shock Classification | Class | Blood Loss | SBP | HR | RR | Mental Status | Skin | |-------|-----------|-----|----|----|--------------|------| | I | <15% | Normal | <100 | 12–20 | Alert | Normal | | II | 15–30% | Normal | 100–120 | 20–30 | Mildly anxious | Pale | | III | 30–40% | <100 | >120 | 30–40 | Anxious, confused | Cold, clammy | | IV | >40% | Undetectable | >140 | >40 | Lethal | Mottled | ## Permissive Hypotension Strategy **Key Point:** In penetrating trauma and uncontrolled hemorrhage (like splenic injury), permissive hypotension (target SBP 90 mmHg) reduces ongoing bleeding and mortality compared to aggressive fluid resuscitation. **High-Yield:** Modern ATLS and trauma guidelines favor **damage control resuscitation (DCR)** — controlled fluid administration (1:1:1 blood:FFP:platelets) with early surgical intervention rather than aggressive crystalloid boluses that dilute clotting factors and increase bleeding. **Clinical Pearl:** This patient is hemodynamically unstable with clear indication for surgery (FAST-positive free fluid, Class III shock, splenic injury suspected). Delaying surgery for CT imaging or observation is contraindicated. ## Correct Management Algorithm ```mermaid flowchart TD A[Blunt abdominal trauma + Class III shock]:::outcome --> B{FAST positive + unstable?}:::decision B -->|Yes| C[Permissive hypotension target SBP 90]:::action C --> D[Type O blood + FFP available]:::action D --> E[Urgent surgical exploration]:::action E --> F[Hemorrhage control + repair/splenectomy]:::outcome B -->|No| G[CT imaging + observation]:::action ``` **Warning:** Aggressive saline resuscitation in uncontrolled hemorrhage worsens outcomes by diluting clotting factors, increasing intracranial pressure, and perpetuating bleeding before surgical hemostasis is achieved.