C Spine clearance in intoxicated patients

A normal high-quality CT cervical spine is highly predictive against clinically significant injury, even in intoxicated trauma patients. For alert, non-polytrauma patients found down or after minor trauma, prolonged collar immobilization may cause more harm than benefit.

Clearing the Intoxicated C-Spine

• CT-based clearance argument: Prospective Western Trauma Association data support CT-based clearance in intoxicated patients, with a 99.9% negative predictive value for clinically significant cervical spine injury.
• Traditional teaching challenge: Classic emergency medicine teaching says intoxicated or obtunded patients cannot be clinically cleared, but newer evidence supports a different pathway after a negative CT.
• Minor trauma pathway: In intoxicated patients with minor trauma or simply found down, collar removal after a negative CT is a defensible practice rather than waiting for clinical sobriety. We walk through the practical pathway in the episode.
• Polytrauma exception: Advanced multisystem trauma is a different population; in those patients, keeping the collar on until formal trauma-service clearance remains the safer default.
• Alcohol level debate: Checking an ethanol level may help estimate disposition timing, but bedside decisions still hinge on clinical sobriety, capacity, and safe ambulation rather than a lab number.

C-Collar Harms and Limited Benefit

• Unproven collar benefit: The benefit of routine cervical collar use has never been convincingly demonstrated, especially in lower-risk intoxicated patients without major trauma.
• Airway and aspiration burden: Cervical collars make airway management harder and increase aspiration risk, a meaningful tradeoff when the anticipated benefit is small.
• Intracranial pressure effects: Collars can impair venous return and raise intracranial pressure, adding physiologic downside in patients who may already be vulnerable.
• Pressure injury risk: Prolonged immobilization increases pressure sores to the head and neck, one of the clearest tangible harms of leaving collars on for hours.
• Imaging cascade effect: The mere presence of a collar increases the likelihood of CT imaging, which can push patients into unnecessary tests and prolonged ED stays.

Self-Extrication and Spine Protection

• Self-protection mechanism: Alert ambulatory patients with neck injury appear to protect their own cervical spine, limiting motion rather than worsening injury during movement.
• Less motion with self-extrication: Narrative review data suggest patients allowed to self-extricate move their cervical spine no more than standard extrication, and sometimes substantially less.
• Guided extrication preference: Biomechanical work suggests guided self-extrication may be the best option for suspected cervical spine injury when the patient can cooperate.
• Rescue device alternative: If a patient cannot self-extricate, a rescue board may reduce cervical spine movement compared with traditional extrication methods; the practical nuances are worth hearing in the chapter.

References:

1. Häske D, et al. An explorative, biomechanical analysis of spine motion during out-of-hospital extrication procedures. Injury. 2020;51(2):185-192. PMID: 31708085.
2. Cowley A, et al. Cervical spine immobilization during extrication of the awake patient: a narrative review. Eur J Emerg Med. 2017;24(3):158-161. PMID: 27748690.
3. Martin MJ, et al; WTA C-Spine Study Group. Cervical spine evaluation and clearance in the intoxicated patient: A prospective Western Trauma Association Multi-Institutional Trial and Survey. J Trauma Acute Care Surg. 2017 Dec;83(6):1032-1040. PMID: 28723840.