Strangulation and Hanging: Emergency Management and Pitfalls

Strangulation injuries are among the most time-critical emergencies you may encounter in prehospital care or the emergency department. The pathophysiology is complex: airway obstruction, venous and arterial compromise, cervical spine injuries, and cerebral hypoxia interact to produce an injury pattern that is easily underestimated. The often unremarkable external presentation in particular can lead you to misjudge the severity of the situation. Patients who initially appear awake and responsive can decompensate within minutes — due to progressive airway edema, carotid artery dissection, or delayed cerebral edema. This article provides you with a structured approach, describes typical injury patterns, and highlights the clinical pitfalls that are critical in acute management.

Definitions and Mechanisms

The terms strangulation and hanging are often used interchangeably in clinical practice but differ significantly in their mechanics. Understanding the underlying forces helps you anticipate the expected injury pattern.

Strangulation

Compression of neck structures by an external force that is not generated by the affected person's own body weight. Typical scenarios include choking (manual or forearm compression), ligature strangulation (by a band, rope, cable), or accidental strangulation (e.g., clothing caught in machinery, straps in children). The force vector is usually horizontal and circumferential.

Hanging

Compression of neck structures by the affected person's own body weight against a ligature. A distinction is made between:

• Complete hanging: The feet have no ground contact; the entire body weight acts on the neck.
• Incomplete hanging: Parts of the body still have ground contact. Common in suicidal hangings from low positions (door handles, bed frames). Despite the seemingly "less harmful" mechanism, even a fraction of body weight is sufficient to occlude the cervical vessels.

Pathophysiological Cascade

The sequence of compromise follows a predictable pattern that depends on the respective occlusion pressures of the neck structures:

1. Venous drainage (from approx. 2 kg of force): The jugular veins are the first structures to be compressed. This leads to venous congestion, facial edema, and petechiae.
2. Arterial supply (from approx. 5 kg of force): The carotid arteries are occluded. Loss of consciousness occurs within 10–15 seconds.
3. Airway (from approx. 15 kg of force): The trachea is compressed. Pure airway obstruction without vascular compromise is rare.
4. Cervical spine injury (from approx. 300+ kg of force): Fractures, subluxations — typically only seen in hanging with a long drop (so-called "judicial drop").

These pressure values illustrate why even in incomplete hanging with only a few kilograms of effective force, lethal cerebral hypoxia can occur long before the airway is mechanically obstructed.

Initial Assessment and Management

Scene Safety and Extrication

Upon arrival at the scene, scene safety is the top priority — especially in strangulations in the context of domestic violence, the perpetrator may still be present. In hanging:

• Support the body from below before cutting the ligature.
• Cut the ligature above the knot (forensic preservation of the knot).
• Anticipate a fall and manually stabilize the cervical spine.

Primary Assessment Using ABCDE

Management follows the standardized ABCDE approach but has specific considerations in strangulation injuries:

A – Airway (with C-spine protection):

• Manual in-line stabilization of the cervical spine until injury has been ruled out.
• Inspection of the neck for strangulation marks, swelling, subcutaneous emphysema, and crepitus.
• Hoarseness, stridor, dysphagia, or voice changes are red flags for laryngeal injury.
• Keep in mind: The airway may be initially patent and deteriorate over hours due to progressive edema or hematoma.

B – Breathing:

• Auscultation: Equal bilateral air entry? Stridor?
• SpO₂ monitoring — caution: In strangulation, pulse oximetry may be unreliable due to venous congestion and peripheral hypoperfusion.
• Watch for signs of pneumomediastinum or pneumothorax (in tracheal rupture).

C – Circulation:

• Signs of venous congestion: facial plethora, petechial hemorrhages (conjunctival, periorbital, retroauricular), cyanosis above the strangulation mark.
• Check carotid pulse bilaterally — asymmetry may indicate vascular dissection.
• Monitoring: ECG (arrhythmias from hypoxia and vagal stimulation), blood pressure measurement.

D – Disability:

• Document the GCS — this is the most important prognostic indicator.
• Pupillary response, lateralizing signs, seizures.
• In unconsciousness: Was the patient already unconscious when found? What is the estimated duration of strangulation?

E – Exposure:

• Complete examination for associated injuries (fall after hanging, defensive injuries in assault-related strangulation).
• Body temperature: hypothermia in prolonged outdoor hanging.

Airway Management — The Central Challenge

Airway management in strangulation injuries is one of the most demanding situations in emergency medicine. You must anticipate a difficult airway, and the decision to intubate requires careful risk-benefit analysis.

Indications for Immediate Airway Securing

• GCS ≤ 8
• Severe respiratory insufficiency (SpO₂ < 90% despite supplemental O₂)
• Massive neck edema with impending airway obstruction
• Stridor at rest with increasing work of breathing
• Extensive subcutaneous emphysema indicating airway injury

Choice of Method

• Endotracheal intubation: Method of choice, but proceed with caution. Laryngeal structures may be edematous, displaced, or fractured. Use a video laryngoscope whenever available. Choose a smaller tube (0.5–1.0 mm smaller than expected).
• Supraglottic airway devices: As a bridging measure in difficult intubation, but not a definitive solution in the presence of laryngeal pathology.
• Surgical airway (cricothyrotomy/emergency tracheotomy): Always have it ready as a backup. In massive laryngeal edema or fracture with an impassable glottis, cricothyrotomy may be the only life-saving option.

Pitfall: The "Prophylactic" Intubation

A common dilemma: The patient is awake, talking, but has strangulation marks and mild hoarseness. Intubate or wait? The guiding principle here is: When in doubt, secure early. An airway that gradually closes over 2–4 hours due to progressive edema may no longer be intubatable at a later point. Awake fiberoptic intubation is an elegant option in the hospital setting when the expertise is available. In the prehospital setting, the rule is: Better to intubate once too early than to perform a cricothyrotomy once too late.

Typical Injury Patterns and Their Relevance

Laryngeal and Tracheal Injuries

• Fractures of the hyoid bone and thyroid cartilage: Particularly in adults over 40, as progressive ossification makes these structures more susceptible to fracture. Clinical findings: crepitus, tenderness to palpation, difficulty swallowing.
• Laryngeal edema and submucosal hemorrhage: May develop in a delayed fashion. Obstruction sometimes occurs only hours after the event.
• Tracheal rupture: Rare but life-threatening. Signs: subcutaneous emphysema, pneumomediastinum, hemoptysis.

Vascular Injuries

• Carotid and vertebral artery dissection: Mechanical compression or hyperextension causes an intimal tear. The dissection may be initially asymptomatic and lead to a delayed thromboembolic stroke (hours to days after the event).
• Jugular venous thrombosis: Less commonly clinically relevant but may contribute to elevated intracranial pressure.

Cerebral Damage

• Hypoxic-ischemic encephalopathy: The most important factor for long-term outcome. The duration of cerebral ischemia determines the extent of damage.
• Cerebral edema: Develops secondarily and may be progressive over 24–72 hours.
• Seizures: As a manifestation of hypoxic brain injury — early treatment with benzodiazepines.

Cervical Spine Injuries

• In classic suicidal hanging with a long drop (> 1.5 m), hangman's fractures (C2 pedicle fractures) or atlantoaxial dislocations are possible.
• In incomplete hanging and manual strangulation, severe cervical spine injuries are rare; however, a consistent immobilization protocol must be maintained until injury has been ruled out.

Advanced Diagnostics in the Hospital

After initial stabilization, structured diagnostics are essential to identify delayed complications:

Imaging

• CT angiography of the neck (carotid and vertebral arteries): Gold standard for ruling out vascular dissections. Indicated in every significant strangulation, regardless of initial neurological status.
• CT head: To rule out intracranial hemorrhage and assess for cerebral edema.
• CT neck/chest: When laryngeal fractures, tracheal injuries, or pneumomediastinum are suspected.
• Plain radiograph of the cervical spine: Only as a screening method; always prefer CT when there is clinical suspicion.

Fiberoptic Laryngoscopy

Should be performed in all patients with hoarseness, stridor, dysphagia, or visible strangulation marks in the neck area. It allows direct assessment of:

• Vocal cord mobility (recurrent laryngeal nerve palsy?)
• Mucosal edema and hemorrhage
• Cartilage fractures and dislocations

Laboratory Diagnostics

• Blood gas analysis (hypoxia, hypercapnia, lactate)
• Troponin (myocardial ischemia due to hypoxia)
• Coagulation panel
• CK and myoglobin in prolonged strangulation

Special Therapeutic Considerations

Neuroprotective Measures

• Target normoxia: SpO₂ 94–98%. Avoid hyperoxia — it can exacerbate oxidative reperfusion injury.
• Normocapnia: etCO₂ 35–45 mmHg. Avoid both hypo- and hyperventilation.
• Normoglycemia: Monitor blood glucose closely; correct both hypo- and hyperglycemia.
• Normothermia: Treat fever aggressively (paracetamol, physical cooling). Targeted hypothermia therapy after hypoxic brain injury is discussed analogously to post-resuscitation care, but the evidence specifically for strangulation victims is limited.
• Elevate the head of bed: 30° to optimize venous drainage.

Pharmacological Therapy

• Dexamethasone: The evidence for steroids in laryngeal edema following strangulation is sparse; however, in clinical practice, dexamethasone 8–12 mg IV is commonly administered to reduce edema.
• Anticoagulation/antiplatelet therapy: In confirmed vascular dissection after interdisciplinary consultation (neurology, vascular surgery). No blind anticoagulation without prior imaging.
• Anticonvulsive therapy: Midazolam 0.1 mg/kg IV or diazepam 0.15 mg/kg IV for seizures. In status epilepticus, escalation per standard protocol (levetiracetam, valproate, propofol/thiopental if needed).

Forensic Aspects — Don't Forget

In every strangulation injury, you must consider forensic aspects, even though acute management takes priority:

• Documentation: Detailed description of strangulation marks (location, width, pattern, color, degree of swelling). Photographic documentation with a scale reference, if possible.
• Preserve the ligature: Do not untie the knot; cut the ligature next to the knot.
• Preserve clothing: Especially in assault-related strangulation.
• History: Who found the person? In what position? Was the ligature still in situ? Estimated duration?

In cases of suspected assault-related strangulation, there is a mandatory reporting obligation. Strangulation injuries in the context of domestic or sexual violence are frequently downplayed — by the victims themselves, but also by medical personnel. Take even seemingly minor strangulation marks seriously and offer psychosocial support.

Disposition and Monitoring

Every person with a strangulation injury must be admitted for inpatient monitoring — even if initial findings are unremarkable. The minimum monitoring period is 24 hours, as delayed complications (airway edema, vascular dissection with secondary stroke, progressive cerebral edema) are common.

Indications for intensive care monitoring:

• Any episode of loss of consciousness
• GCS < 15 on admission
• Requirement for intubation
• Confirmed vascular dissection
• Laryngeal fracture or significant airway edema
• Abnormal neurological findings (lateralizing signs, seizures, cognitive deficits)

Practical Training

Strangulation injuries require an integrated management approach combining airway management, cervical spine stabilization, and neuroprotective therapy under time pressure. The decision between watchful observation and immediate intubation, recognizing a gradually evolving airway obstruction, and managing the difficult airway are best trained through realistic case simulations. In the Emergency Physician Refresher Course by Simulation Tirol, exactly these types of complex scenarios are practiced in small groups — from initial prehospital contact through to in-hospital handover. This way, you gain the confidence and competence you need when you actually encounter such a case.

---