What is the appropriate initial imaging workup for a patient who survived an attempted hanging?

Imaging for Attempted Self-Hanging

CT cervical spine without IV contrast and CT angiography (CTA) of the neck should be performed as the initial imaging workup for all patients who survive an attempted hanging, regardless of their neurological status.

Initial Imaging Approach

The appropriate imaging strategy depends on the patient's clinical presentation, but given the potential for life-threatening injuries to critical structures, a comprehensive approach is warranted:

For All Patients (Alert and Obtunded)

CT cervical spine without IV contrast is the recommended initial imaging modality 1. This follows the ACR Appropriateness Criteria 2024 guidelines for acute blunt cervical spine trauma, as hanging represents a high-energy mechanism with significant risk for cervical spine injury.

CTA of the neck should be performed routinely to evaluate for blunt cerebrovascular injury (BCVI), specifically carotid and vertebral artery dissections 2, 3. This recommendation is critical because:

• The incidence of vascular injury in hanging/strangulation is 4.6% 2
• There are no clinical or laboratory findings that can reliably exclude vascular injury 2
• Untreated blunt carotid injury carries a 23-30% risk of stroke 2
• All vascular injuries in one series occurred in the most severely injured patients (those in cardiac arrest or requiring ICU admission) 4

Clinical Context Matters

The evidence reveals important nuances based on patient presentation:

For obtunded/severely injured patients (GCS <15):

• Proceed with both CT cervical spine and CTA neck without hesitation
• These patients have significantly higher mortality (26.9-43.8%) compared to alert patients 5
• Brain injury occurs in 14.9% of patients with GCS <15 5
• Consider head CT as well, though structural brain findings are primarily related to hypoxic injury rather than direct trauma

For alert patients (GCS 15) without concerning examination findings:

• The evidence is more nuanced here, with some studies suggesting selective imaging may be appropriate 6
• However, vascular injuries can occur even in neurologically intact patients, and the consequences of missing them are severe
• A normal GCS has 100% negative predictive value for intracranial injury requiring intervention 5
• If the patient has GCS 15 AND no cervical spine tenderness AND no dysphagia, dysphonia, stridor, or crepitus, imaging may potentially be deferred 6

What NOT to Do

Do not routinely add MRI cervical spine if CT is normal 1. The ACR guidelines explicitly state:

• MRI has a false-positive rate of 20-40% for clinically significant ligamentous injury
• Adding MRI to CT prolongs collar immobilization and mechanical ventilation
• Studies show CT alone leads to shorter ICU stays without missing unstable injuries or affecting mortality 1
• MRI should only be considered if there are persistent neurologic symptoms or confirmed ligamentous/cord injury on CT

Key Injury Patterns to Detect

The imaging workup targets three critical injury categories:

1. Cervical spine fractures (1.4-3.3% incidence) 3, 5
2. Blunt cerebrovascular injury (2.5-4.6% incidence) 2, 3, 4
3. Laryngotracheal injuries (3-4% incidence) 3

Common Pitfalls

• Don't assume a normal neurological exam excludes vascular injury - dissections can be clinically silent initially 2
• Don't skip CTA in severely injured patients - all vascular injuries in one series occurred in patients requiring ICU admission 4
• Don't over-image young patients with recurrent self-harm - a distinct subgroup of predominantly young females with psychiatric disorders and recurrent attempts had zero injuries detected 7
• Don't rely on head CT to exclude hypoxic brain injury - CT is often normal acutely despite significant hypoxic injury 8

Practical Algorithm

1. All patients: CT cervical spine without contrast
2. Add CTA neck if:
   • GCS <15
   • Patient required resuscitation/ICU admission
   • Any concerning neck examination findings (tenderness, dysphagia, dysphonia, stridor, crepitus)
   • Consider for all patients given inability to clinically exclude BCVI 2
3. Consider selective imaging only for GCS 15 patients with completely normal neck examination and no concerning symptoms 6
4. Reserve MRI for patients with neurologic deficits or abnormalities detected on CT requiring further characterization 1

The most recent and highest quality evidence (2025 ACR guidelines and 2025 multicenter vascular injury study) supports an aggressive imaging approach prioritizing CT and CTA, as the morbidity from missed vascular injuries far outweighs the risks of imaging 1, 2.