Trauma: Primary & Secondary Survey, ATLS, Permissive Hypotension

Trauma: Primary & Secondary Survey, ATLS, Permissive Hypotension

A practical guide for immediate application in emergency and critical care.

What Is This?

A structured approach to assessing and stabilizing trauma patients using the Primary Survey (ABCDE), Secondary Survey (head-to-toe exam), Advanced Trauma Life Support (ATLS) principles, and permissive hypotension (controlled low blood pressure to limit bleeding).

Why use it today? Trauma is the leading cause of death under age 45. This system reduces preventable deaths by prioritizing life-threatening injuries and guiding rapid, evidence-based interventions.

Why It Matters

• Saves lives: 30–40% of trauma deaths are preventable with early, correct intervention.
• Standardized care: ATLS is the global gold standard for trauma management, used in EDs, prehospital settings, and military medicine.
• Reduces errors: Systematic assessment prevents missed injuries (e.g., tension pneumothorax, pelvic fractures).
• Guides resuscitation: Permissive hypotension balances bleeding control with organ perfusion in hemorrhagic shock.

Core Concepts

1. Primary Survey (ABCDE)

A rapid (1–2 minute) assessment to identify and treat immediate threats to life. Treat as you find—do not proceed to the next step until the current issue is stabilized.

Mnemonic: "A B C D E — All Bleeding Ceases During Evaluation."

2. Secondary Survey (Head-to-Toe Exam)

A detailed, systematic exam after the primary survey is complete and the patient is stabilized. Includes: - History: AMPLE (Allergies, Medications, Past medical history, Last meal, Events/environment). - Full physical exam: Head, neck, chest, abdomen, pelvis, extremities, neuro. - Diagnostics: X-rays (C-spine, chest, pelvis), FAST ultrasound, CT scans (if stable). - Reassessment: Repeat primary survey frequently (e.g., every 5–10 mins in unstable patients).

Key injuries to rule out: - Head: Skull fractures, intracranial hemorrhage. - Neck: Vascular injury, spinal cord trauma. - Chest: Rib fractures, flail chest, aortic dissection. - Abdomen: Liver/spleen lacerations, hollow viscus injury. - Pelvis: Open-book fractures (high mortality). - Extremities: Compartment syndrome, vascular compromise.

3. Advanced Trauma Life Support (ATLS)

A standardized protocol developed by the American College of Surgeons (ACS) to train providers in trauma care. Key principles: - Treat the greatest threat first (e.g., airway before fractures). - Assume cervical spine injury until proven otherwise. - Limit crystalloid resuscitation in bleeding patients (use blood products early). - Damage control surgery: Stop bleeding, control contamination, defer definitive repair.

ATLS Algorithm:
1. Primary Survey (ABCDE)-Resuscitation (IV fluids, blood, interventions).
2. Adjuncts to Primary Survey (EKG, pulse ox, ABG, FAST ultrasound, X-rays).
3. Secondary Survey-Definitive care (OR, ICU, transfer).

4. Permissive Hypotension

A controlled low blood pressure strategy in hemorrhagic shock to: - Reduce bleeding by avoiding clot disruption. - Limit fluid overload (excess crystalloid worsens coagulopathy and acidosis). - Buy time for definitive hemorrhage control (e.g., surgery, embolization).

Target SBP: 80–90 mmHg (or palpable radial pulse) until bleeding is controlled. Exceptions: - Traumatic brain injury (TBI): Maintain SBP ?100–110 mmHg to preserve cerebral perfusion. - Elderly/HTN patients: May tolerate higher SBP (e.g., 100 mmHg).

How to implement:
1. Stop bleeding: Direct pressure, tourniquets, pelvic binders.
2. Minimize crystalloid: Give 1L bolus, then switch to blood products (1:1:1 ratio of PRBCs:FFP:platelets).
3. Monitor: Lactate, base deficit, urine output (goal: >0.5 mL/kg/hr).
4. Avoid pressors: Vasopressors (e.g., norepinephrine) can worsen ischemia in hypovolemic shock.

How It Works (Step-by-Step Workflow)

1. Scene Arrival (Prehospital)

• Safety first: Ensure scene is safe for providers.
• Rapid assessment: Mechanism of injury (MOI)-high-energy (e.g., MVC, fall >20 ft) = assume major trauma.
• Primary survey (ABCDE): Treat life threats (e.g., needle thoracostomy for tension pneumothorax).
• Transport: Load-and-go for unstable patients; stay-and-play for stable patients (e.g., isolated extremity injury).

2. ED Arrival

Primary Survey (ABCDE)

• A: Intubate if GCS ?8 or airway compromise.
• B: Needle decompression if tension pneumothorax (2nd ICS, midclavicular line).
• C:
• Apply tourniquet to bleeding extremities.
• Start 2 large-bore IVs (18G or larger).
• Give 1L LR if hypotensive; switch to blood if no response.
• D: GCS, pupils, lateralizing signs.
• E: Log-roll, inspect back, warm patient.

Adjuncts to Primary Survey

• FAST ultrasound: Check for free fluid in abdomen/chest.
• X-rays: C-spine, chest, pelvis (if hemodynamically stable).
• EKG: Rule out cardiac injury (e.g., blunt cardiac trauma).

Secondary Survey

• AMPLE history: Allergies, meds, PMH, last meal, events.
• Full exam: Head-to-toe, including rectal/vaginal exam (if indicated).
• Diagnostics: CT scans (if stable), labs (CBC, coags, type & cross, lactate).

Definitive Care

• OR: For hemorrhage control (e.g., laparotomy, thoracotomy).
• ICU: For ongoing resuscitation (e.g., massive transfusion protocol).
• Transfer: If facility lacks resources (e.g., neurosurgery for TBI).

Hands-On / Getting Started

Prerequisites

• Knowledge: Basic anatomy, physiology of shock, airway management.
• Skills: IV insertion, needle decompression, tourniquet application, FAST ultrasound.
• Equipment:
• Trauma bay setup (O?, suction, airway cart, IV supplies, pelvic binder, tourniquets).
• Ultrasound machine (for FAST exam).
• Blood products (PRBCs, FFP, platelets).

Step-by-Step Minimal Example: Trauma Resuscitation

Scenario: 25M MVC, unrestrained driver, hypotensive (SBP 70), GCS 13, left chest wall deformity.

1. Primary Survey (ABCDE):
2. A: Airway patent, no stridor. C-spine immobilized.
3. B: Absent breath sounds on left-needle decompression (2nd ICS, midclavicular line)-chest tube.
4. C: Weak radial pulse-2 large-bore IVs-1L LR bolus-SBP 85. Apply pelvic binder (suspect pelvic fracture).
5. D: GCS 13, pupils equal and reactive.

6. E: Log-roll-no back injuries. Cover with warm blankets.

7. Adjuncts:

8. FAST ultrasound: Positive for free fluid in abdomen (Morison’s pouch).

9. X-rays: Chest (left pneumothorax), pelvis (open-book fracture).

10. Secondary Survey:

11. AMPLE: No allergies, no meds, no PMH, last meal 4 hrs ago, high-speed MVC.

12. Exam: Left chest crepitus (flail chest), tender abdomen, unstable pelvis.

13. Definitive Care:

14. Activate massive transfusion protocol (1:1:1 PRBCs:FFP:platelets).
15. OR: Exploratory laparotomy (splenic laceration) + pelvic external fixation.

Expected Outcome: - SBP 90 mmHg after blood products. - Bleeding controlled in OR. - Patient transferred to ICU for ongoing resuscitation.

Common Pitfalls & Mistakes

Best Practices

Primary Survey

• Assume C-spine injury: Immobilize until cleared clinically/radiographically.
• Use capnography: Confirm ET tube placement (CO? >30 mmHg).
• FAST ultrasound: Perform during primary survey (takes <2 mins).

Secondary Survey

• Log-roll carefully: Maintain C-spine alignment.
• Check for occult injuries: Rectal exam (tone, blood), vaginal exam (if pelvic fracture).
• Reassess frequently: Vital signs, GCS, and exam findings can change rapidly.

Permissive Hypotension

• Target SBP 80–90 mmHg (or palpable radial pulse).
• Avoid pressors: They worsen ischemia in hypovolemic shock.
• Use blood early: 1:1:1 ratio (PRBCs:FFP:platelets) reduces coagulopathy.

ATLS Principles

• Treat first what kills first: Airway > breathing > circulation.
• Damage control surgery: Stop bleeding, control contamination, defer definitive repair.
• Transfer early: If your facility lacks resources (e.g., neurosurgery, interventional radiology).

Tools & Frameworks

Real-World Use Cases

1. Motor Vehicle Collision (MVC) with Polytrauma

Scenario: 30F unrestrained driver, T-boned at high speed. Hypotensive (SBP 70), GCS 10, left chest deformity. Application: - Primary Survey: Needle decompression for tension pneumothorax, pelvic binder for suspected fracture, 1L LR bolus. - FAST ultrasound: Positive for free fluid in abdomen-OR for laparotomy (splenic rupture). - Permissive hypotension: Target SBP 85 mmHg until bleeding controlled. - Secondary Survey: CT head (TBI), CT C-spine (fracture), CT chest/abdomen/pelvis (rib fractures, liver laceration).

2. Gunshot Wound to Abdomen

Scenario: 22M GSW to left upper quadrant. Hypotensive (SBP 60), distended abdomen. Application: - Primary Survey: 2 large-bore IVs, 1L LR-no response-activate massive transfusion protocol. - FAST ultrasound: Positive for hemoperitoneum-emergent laparotomy. - Permissive hypotension: SBP 80 mmHg until bleeding controlled (avoid over-resuscitation). - Damage control surgery: Pack liver laceration, leave abdomen open for second-look.

3. Fall from Height with TBI

Scenario: 50M fell 20 ft, GCS 7, right pupil dilated. Application: - Primary Survey: Intubate (GCS ?8), hyperventilate (target PaCO? 30–35 mmHg for herniation), mannitol (1 g/kg). - Permissive hypotension exception: Maintain SBP ?110 mmHg (TBI requires higher perfusion). - CT head: Subdural hematoma-neurosurgical evacuation. - Secondary Survey: CT C-spine (fracture), CT chest/abdomen (rib fractures, pneumothorax).

Check Your Understanding (MCQs)

Question 1

A 25-year-old male presents after a high-speed MVC. He is hypotensive (SBP 70), tachycardic (HR 130), and has absent breath sounds on the left. What is the first step in management?

A. Insert a chest tube on the left side. B. Perform a FAST ultrasound to assess for abdominal bleeding. C. Perform needle decompression of the left chest. D. Start 2 large-bore IVs and give 1L of LR.

Correct Answer: C (Perform needle decompression of the left chest.) Explanation: The patient has a tension pneumothorax (absent breath sounds + hypotension + tachycardia), which is immediately life-threatening. Needle decompression is the first step in the B (Breathing) phase of the primary survey. Why the Distractors Are Tempting: - A: Chest tube is definitive treatment but takes longer; needle decompression is faster. - B: FAST is important but not the first step—tension pneumothorax kills faster. - D: IV fluids are part of C (Circulation), but B must be addressed first.

Question 2

A