. Author manuscript; available in PMC: 2013 Mar 20.

Published in final edited form as: Prehosp Emerg Care. 2011 Dec 22;16(2):293–298. doi: 10.3109/10903127.2011.640764

Table 1.

Intubation Process Variables

Variable	Definition
Percentage of glottic opening (POGO) score (0%–100%)	POGO is a validated score for determining the difficulty of an intubation^11,12^*
C-L view (1–4)	Technique for describing laryngeal view during laryngoscopy¹³
Number of attempts	The total number of times the laryngoscope blade was put in the mouth
Esophageal Intubation (yes/no)	Was the endotracheal tube at any time during the attempt incorrectly placed in the esophagus as opposed to correctly placed in the trachea?
Number of forward movements	The number for forward movements made by the endotracheal tube prior to successful placement or aborting the attempt
First-pass success (yes/no)	Successfully passing the endotracheal tube past the vocal cords the first time the laryngoscope blade is placed in the patient’s mouth

For complete reference citations, see the reference list.

POGO = percentage of glottic opening.