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Preoxygenation Techniques for Tracheal Intubation in Critically Ill Adults Utilizing Oxygen Mask and Noninvasive Ventilation
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[Cervical spine movement during bag-mask ventilation].

Yoshihiro Hirabayashi1, Akifumi Fujita, Hideharu Sugimoto

  • 1Department of Anesthesiology, International University of Health and Welfare Hospital, Nasushiobara 329-2763.

Masui. the Japanese Journal of Anesthesiology
|April 3, 2013
PubMed
Summary

Bag-mask ventilation causes significant cervical spine movement in living patients, with anterior vertebral displacement and angular changes. This study quantifies neck motion during this common airway procedure.

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Area of Science:

  • Anesthesiology
  • Neurosurgery
  • Emergency Medicine

Background:

  • Airway management techniques invariably involve neck movement.
  • Face-mask ventilation necessitates jaw thrust, potentially impacting cervical spine stability.
  • Previous studies on cadavers indicated significant cervical spine motion during bag-mask ventilation.

Purpose of the Study:

  • To quantitatively assess cervical spine motion during bag-mask ventilation in living human subjects.
  • To provide data on the extent of vertebral movement and angular changes induced by this airway technique.

Main Methods:

  • Radiographic measurements of cervical spine movement were performed on 20 patients.
  • Measurements were taken in a neutral head position and during bag-mask ventilation.
  • Analysis focused on anterior vertebral displacement and angular changes at specific cervical segments.

Main Results:

  • Bag-mask ventilation induced significant anterior displacement of vertebral bodies (e.g., 11.3 mm at atlas).
  • Angular changes were observed across multiple motion segments (e.g., 7.4 degrees at occiput/C1).
  • Total angular change from occiput to C4 averaged 13.8 degrees.

Conclusions:

  • Jaw thrust during bag-mask ventilation leads to both extension and anterior disposition of cervical vertebrae.
  • These findings highlight the biomechanical effects of a common airway maneuver on the cervical spine.
  • Understanding these movements is crucial for patient safety, particularly in trauma cases.