PENETRATING NECK INJURIES (PNI) - Clinical Presentation, Assessment and Management

Model Answer for RGUHS University - 20 Marks

1. INTRODUCTION

2. SURGICAL ANATOMY AND ZONES OF THE NECK

Roon and Christensen's Zonal Classification (1979)

• Contents: subclavian vessels, vertebral arteries, common carotid artery origins, trachea, esophagus, thoracic duct (on left), lung apices
• Mortality: ~12% (highest)
• Surgical access: difficult (protected by bony thorax/clavicle); right side approached via median sternotomy, left via left anterior thoracotomy
• Management: CTA/angiography mandatory for stable patients; NOT mandatory exploration

• Contents: common/internal/external carotid arteries, internal jugular vein, vertebral artery, larynx, trachea, esophagus, vagus nerve, recurrent laryngeal nerve
• Most frequently injured zone (~55-65% of all PNI)
• Surgical access: easy - via anterior border of sternocleidomastoid
• Management: historically mandatory exploration; now selective approach preferred

• Contents: distal internal carotid, vertebral arteries, internal jugular vein, salivary glands, cranial nerves IX-XII
• Surgical access: very difficult (protected by skull base; may need mandibulotomy)
• Management: CTA/angiography mandatory; endovascular techniques preferred

3. AETIOLOGY AND MECHANISM

4. CLINICAL PRESENTATION - ASSESSMENT

A. Primary Survey (ATLS Principles)

• A (Airway): Most immediate threat. Establish airway - oral/nasal intubation, cricothyroidotomy, or tracheostomy. Direct transcervical tracheal intubation is safer than oral intubation when the pharynx/larynx is filled with blood. Never probe the wound (clot dislodgement causes uncontrollable bleeding). Never blindly clamp vessels in the wound.
• B (Breathing): Assess for tension pneumothorax, hemothorax. CXR to rule out pneumomediastinum (suggests hollow viscus puncture).
• C (Circulation): Large-bore IV access even in normotensive patients. Direct pressure for hemorrhage control.
• D (Disability): Full neurological exam - document cranial nerve deficits, spinal cord status.
• E (Exposure): Full body examination including posterior neck for exit wounds.

B. HARD SIGNS vs. SOFT SIGNS

HARD SIGNS (= Immediate Surgical Exploration)

SOFT SIGNS (= Mandatory Further Investigation with CTA/Imaging)

C. History Taking (Scott-Brown)

• Mechanism of injury: stab, GSW, blast
• Time elapsed since injury (critical for esophageal repair - >12 hours = 40% mortality)
• Symptoms: hemoptysis, hematemesis, dysphagia, odynophagia, dysphonia, stridor
• Past medical and surgical history; time of last meal

D. Signs and Symptoms Checklist (Cummings, Box 120.1)

5. INVESTIGATIONS

Mandatory for ALL patients:

1. Anterior and lateral neck radiographs: Identify foreign bodies, subcutaneous emphysema, prevertebral air, cervical spine fractures, bullet trajectory
2. Chest X-ray: Hemothorax, pneumothorax, pneumomediastinum, widened mediastinum
3. Cervical spine protection until fracture excluded radiographically

Investigations Based on Clinical Findings:

6. MANAGEMENT FLOWCHARTS

FLOWCHART 1: Overall Management Algorithm - Penetrating Neck Trauma Protocol

FLOWCHART 2: Modified Zone-Based Approach

FLOWCHART 3: Simplified Management Algorithm (Text-Based)

PENETRATING NECK INJURY
         |
         ↓
Does wound breach the platysma?
    /              \
   NO               YES
   |                 |
Superficial      ATLS Resuscitation
wound -          (A-B-C-D-E)
Observation          |
                     ↓
              Hemodynamically STABLE?
              /                    \
            NO                     YES
            |                       |
    Immediate OR /            Assess for
    Interventional            HARD SIGNS
    Angiography                    |
            |              ________|________
            |             YES             NO
            ↓              |               |
         Repair          Immediate       Assess for
         Injury            OR             SOFT SIGNS
                           |           /           \
                           |         YES            NO
                           |          |              |
                           |    CTA + further     Zone-based
                           |    investigations    observation
                           |
                           ↓
                    Based on zone:
              Zone I → CTA → vascular surgery
              Zone II → CTA or exploration
              Zone III → CTA → endovascular preferred

7. SPECIFIC STRUCTURE MANAGEMENT

A. Vascular Injuries

• External carotid: ligation safe (good collateral circulation)
• Common/internal carotid (Zone II): exploration via anterior border of SCM; lateral arteriorrhaphy / end-to-end anastomosis / saphenous vein graft
• Ligation reserved for: irreparable injury + coma + bilateral fixed dilated pupils
• Carotid revascularization vs. ligation (Scott-Brown): Liekwig & Greenfield (1978) showed severe neurological deficit patients (short of coma) had better outcomes with revascularization. Brown et al. (1982) confirmed revascularization indicated even in comatose patients if ischemia was of short duration.

• Right side: median sternotomy
• Left side: left anterior thoracotomy

• Transcatheter arterial embolization
• Detachable balloons or steel coils for carotid occlusion
• No. 4 Fogarty catheter shunt for temporary hemorrhage control

• ~20% require emergency surgery; >33% require embolization (endovascular preferred)

B. Laryngotracheal Injuries

• Laryngeal mucosal lacerations: Early repair within 24 hours reduces airway scarring and voice problems
• Significant glottic/supraglottic lacerations: Thyrotomy + open fracture reduction + mucosal repair ± laryngeal stent
• Simple tracheal lacerations (not detaching ring): direct repair without tracheostomy
• Severe tracheal disruption (GSW): 6-week tracheostomy through or below the injury
• CT + endoscopy differentiate observation vs. thyrotomy candidates
• Impaled objects must NOT be removed in the field

C. Esophageal Injuries (Scott-Brown)

• Time-critical: Delay >12 hours → 40% mortality; <12 hours → 9% mortality
• Diagnosis: combined esophagram + esophagoscopy = 100% sensitivity
• Treatment: primary repair with drainage; IV antibiotics 7-10 days + nasogastric/TPN
• Interposition of strap muscle between esophageal and tracheal repairs if both injured (prevents fistula)
• Small cervical esophageal injuries: conservative management with antibiotic coverage in selective cases

D. Pharyngeal Injuries (Scott-Brown)

• Supra-arytenoid hypopharyngeal injuries: Can be managed non-operatively (capacious, low-pressure, double muscle layer protection)
• Infra-arytenoid injuries: 22% complication rate; requires exploration, repair, and drainage
• Flexible nasopharyngoscopy for assessment; oesophagography unreliable for hypopharyngeal injuries

E. Spinal Cord Injuries

• Suspect in hypotension WITHOUT tachycardia (spinal shock)
• C-spine protection until radiographically cleared
• Document neurological deficit before surgery

8. MANDATORY vs. SELECTIVE EXPLORATION

Historical Perspective:

• Pre-WWII: Non-operative mortality = 15-18%
• Fogelman & Stewart (1956): Advocated mandatory exploration for all platysma-breaching wounds - reduced mortality to 6%
• Stone (1963): Questioned mandatory exploration for civilian injuries
• Vietnam War: All patients below-platysma explored mandatorily under GA
• Post-1980s: Growing evidence for selective management

Arguments for MANDATORY Exploration:

1. Physical examination unreliable (sensitivity ~85%)
2. No single diagnostic test has 100% sensitivity for esophageal/vascular injury
3. Low morbidity of negative exploration (~3-5%)
4. Avoids time-delay of investigations
5. Esophageal injury delay increases morbidity exponentially

Arguments for SELECTIVE Exploration:

1. Negative exploration rate with mandatory approach: 36-89% (Scott-Brown)
2. High sensitivity/specificity of modern CTA and endoscopy
3. Avoids unnecessary surgery and anesthesia risks
4. Cost-effective
5. Most trauma centers now adopt selective management

9. "NO-ZONE" APPROACH - Recent Advance

• CTA is highly sensitive (>90%) for detecting all vascular and aerodigestive injuries regardless of zone
• Clinical symptoms and signs (rather than zone) are better predictors of injury
• Ibraheem et al. (cited in Cummings): "No-zone" approach reduced unnecessary CTA and negative explorations
• Multislice helical CTA is now the preferred initial screening tool in stable patients

10. RECENT ADVANCES (2021-2026)

1. Endovascular/hybrid approaches: Zone I and Zone III injuries increasingly managed with endovascular stenting, embolization, and balloon occlusion - avoiding high-morbidity open surgery. Vertebral artery injuries: majority managed endovascularly (Kose SI, Emerg Radiol, 2025 - Imaging in penetrating neck injuries [PMID: 40279044])
2. CTA as universal first-line: Multislice CTA has replaced formal angiography as the first-line investigation in all zones. Sensitivity >97% for vascular injuries. The "no-zone" symptom-guided CTA approach is now widely adopted.
3. Damage control surgery: In hemodynamically unstable patients, temporizing balloon occlusion (REBOA - Resuscitative Endovascular Balloon Occlusion of the Aorta) and abbreviated surgery followed by ICU resuscitation.
4. Point-of-care ultrasound (POCUS/FAST): Rapid bedside assessment in emergency department for hematoma, effusion, vascular injury.
5. Changing epidemiology: Patel et al. (Br J Oral Maxillofac Surg, 2024 [PMID: 38749799]) reported changing patterns at Level 1 trauma centres - increasing stab wounds over GSWs; younger patients; importance of multidisciplinary teams.
6. Psychological impact: Hjalmarsson et al. (Br J Oral Maxillofac Surg, 2026 [PMID: 41558867]) highlighted the psychological trauma (PTSD, anxiety) following PNI - now part of holistic management.
7. Pre-hospital management: Tourniquet application, wound packing with haemostatic gauze, and junctional hemorrhage control are standard pre-hospital measures (Simpson et al., 2021 [PMID: 34530879]).
8. Transcervical injuries (crossing midline): Associated with vascular or aerodigestive injury in 73-100% of patients - require full workup regardless of zone.

11. COMPLICATIONS

Immediate:

• Hemorrhage (leading cause of death)
• Airway obstruction
• Spinal cord injury
• Air embolism

Delayed:

• Pseudoaneurysm (false aneurysm from incomplete vessel wall repair)
• Arteriovenous fistula (carotid-jugular)
• Mediastinitis (from esophageal/pharyngeal injury - high mortality)
• Chylous fistula (thoracic duct injury on left side)
• Vocal cord paralysis (RLN injury)
• Horner syndrome (sympathetic chain injury)
• Stroke (carotid thrombosis/embolization)
• Wound infection and abscess

12. POST-OPERATIVE MANAGEMENT

• Hemodynamic and neurological monitoring for 48-72 hours minimum
• Frequent clinical examination (at least 3 times per 24-hour shift)
• Antibiotic prophylaxis (IV, 7-10 days for hollow viscus injuries)
• Nutritional support (nasogastric or TPN if esophageal repair done)
• Tracheostomy care if performed
• Physiotherapy and voice rehabilitation for laryngeal injuries
• Psychological support and counseling (Hjalmarsson et al., 2026)

SUMMARY TABLE

SOURCES REFERENCED

• Cummings Otolaryngology Head and Neck Surgery, Chapter 120: Penetrating Neck Injuries (pp. 2329-2344)
• Scott-Brown's Otorhinolaryngology Head & Neck Surgery, Chapter 38: Neck Trauma (pp. 641-650)
• Tintinalli's Emergency Medicine - Penetrating Neck Injury chapter with management flowchart
• Fischer's Mastery of Surgery 8th ed. - The "No-Zone" Approach chapter
• Mulholland & Greenfield's Surgery - Penetrating Neck Trauma, Functional Anatomy
• Dhingra's Diseases of ENT - Neck Trauma (trauma classification and zone-based management)
• Hazarika's Textbook of ENT - Penetrating neck injuries (standard Indian ENT curriculum reference)
• Patel K et al. Br J Oral Maxillofac Surg 2024 - Changing patterns of PNI
• Kose SI. Emerg Radiol 2025 - Imaging in PNI
• Simpson C et al. Scand J Trauma 2021 - Pre-hospital management of PNI
• Hjalmarsson C et al. Br J Oral Maxillofac Surg 2026 - Psychological impact of PNI

RGUHS Exam Tip: For 20-mark questions, examiners expect: (1) Introduction with incidence, (2) Zones diagram with boundaries and contents, (3) Clinical features including hard vs. soft signs, (4) Investigations table, (5) Management flowchart, (6) Specific structure management (vascular, airway, esophagus), (7) Mandatory vs. selective exploration debate, and (8) Recent advances including the "no-zone" approach and endovascular techniques. The two flowcharts above (Tintinalli and Cummings) directly address the "diagram and flowchart" requirement.