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Updated: Oct 17, 2026

Topical Airway Anesthesia for Awake-endoscopic Intubation Using the Spray-as-you-go Technique with High Oxygen Flow
Published on: January 13, 2017
Subcutaneous emphysema following trans-cricothyroid membrane injection of local anesthetic
1Department of Anesthesia, Toronto Western Hospital, University of Toronto, Ontario, Canada. dwong@torhosp.toronto.on.ca
Purpose:
To present a case of preoperative subcutaneous emphysema (SCE) as a complication of trans-cricothyroid membrane (TCM) injection of lidocaine for awake intubation.
Clinical Features:
A 48-yr-old man with cervical myelopathy was scheduled for elective cervical discectomy. Airway topical anesthesia consisted of lidocaine pledgets and TCM injection. After successful awake fibreoptic intubation was performed, SCE was noted in the neck region. The main differential diagnosis of preoperative SCE included air leak via the anterior needle track from TCM injection or disruption of mucosal membrane in the aerodigestive tract. The latter was excluded by panendoscopy and an upper GI swallow study. The most likely explanation for SCE was air leak from the anterior needle tract. The subcutaneous emphysema resolved spontaneously without sequella.
Conclusion:
Subcutaneous emphysema is a rare but potentially serious complication of TCM injection of lidocaine. Anesthesiologists should be familiar with the differential diagnosis, investigations and management of SCE.
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