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Table 1 Definitions of radiographic indices investigated in this study

From: No radiographic index predicts difficult intubation using the Optiscope™ in cervical spine surgery patients: a retrospective study

 

Detailed description

Meaning

Cervical spine lateral X-ray

MHD (mm)

Linear distance from the inferior border of the mandibular body to the highest point of the hyoid bone

Tongue size

C1C5D (mm)

Linear distance from the antero-superior border of atlas to the antero-inferior border of the fifth cervical vertebra

Neck length

C1OD (mm)

Linear distance from upper margin of posterior tubercle of atlas to occiput

Neck extension

HCD (mm)

Linear distance from the highest point of the hyoid bone to the anterior border of the nearest cervical vertebra

Tongue size

C1C2D (mm)

Linear distance from lower margin of the spinous processes of atlas to upper margin of the spinous processes of axis in the neutral position

Neck extension

C1-I-C6 (0)

The angle between the line from the anterior border of atlas to the tip of upper incisors and the line from the antero-inferior border of C6 vertebral body to the tip of upper incisors in the neutral position

Cervical range of motion

I-C6-C1 (0)

The Angle between the line from the tip of upper incisors to the antero-inferior border of C6 vertebral body and the line from the anterior border of atlas to the antero-inferior border of C6 vertebral body in the neutral position

Cervical range of motion

I-C1-C6 (0)

The Angle between the line from the tip of upper incisors to the anterior border of atlas and the line from the antero-inferior border of C6 vertebral body to the anterior border of atlas.

Cervical range of motion

C1-I-C6′ (0)

Same as C1-I-C6 in the extension position of the cervical spine

Cervical range of motion

I-C6-C1′ (0)

Same as I-C6-C1 in the extension position of the cervical spine

Cervical range of motion

I-C1-C6′ (0)

Same as I-C1-C6 in the extension position of the cervical spine

Cervical range of motion

Cervical spine MRI

TL (mm)

Linear distance from the vallecula to the tip of the tongue

Tongue size

TH (mm)

Perpendicular height from the line of tongue length to the top of the tongue

Tongue size

TA (mm2)

Tongue area above the line of tongue length from the tip of the upper incisors to the vallecula in the mid-sagittal plane

Tongue size

EL (mm)

Linear distance from the vallecular to the tip of the epiglottis

Epiglottis size

EPD (mm)

Distance between the epiglottis and the posterior wall of the pharynx

Pharyngeal space

EA (0)

Angle of epiglottis from perpendicular line

Epiglottis angle

CVLVC

Anatomical position of the vocal cords in relation to the cervical vertebrae

Anatomical position of vocal cord

SVD (mm)

Linear distance from skin to the vallecula

Pre-epiglottic area

SED (mm)

Linear distance from skin to the tip of the epiglottis

Pre-epiglottic area

SGD (mm)

Linear distance from skin to the anterior tip of vocal cords

Pre-cord area

  1. MHD Mandibulohyoid distance, C1C5D Atlanto-the 5th cervical vertebral distance, C1OD Atlanto-occipital distance, HCD Hyoidocervical distance, C1C2D Atlanto-axial distance, C1-I-C6 C1-incisor-C6 angle in the neck neutral position, I-C6-C1 Incisor-C6-C1 angle in the neck neutral position, I-C1-C6 Incisor-C1-C6 angle in the neck neutral position, C1-I-C6′ C1-incisor-C6 angle in the neck extension position, I-C6-C1′ Incisor-C6-C1 angle in the neck extension position, I-C1-C6′ Incisor-C1-C6 angle in the neck extension position; MRI Magnetic resonance imaging, TL Tongue length, TH Tongue height, TA Tongue area, EL Epiglottis length, EPD Epiglottic-pharyngeal distance, EA Epiglottis angle, CVLVC Cervical vertebral level of vocal cords, SVD Skin-vallecular distance, SED Skin-epiglottic distance, SGD Skin-glottic distance
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BMC Anesthesiology

ISSN: 1471-2253

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