difficult laryngoscopy
Conditions
Interventions
Gold Standard:Cormack-Lehane grading of glottis exposure on direct laryngoscopic views:Grade I: full view of the glottis
Grade II: partial view of the glottis or arytenoids
Grade III: only the epiglottis is seen
and Grade IV: neither glottis nor epiglottis are visible. Grade I and II were categorized as easy laryngosc
Index test:DSHB-distance 
and 
bone
DSEM-distance 
epiglottis
DSMA-distance 
midpoint 
Sponsors
the Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine
Eligibility
Sex/Gender
All
Age
18 Years to 90 Years
Inclusion criteria
Inclusion criteria: 1. American Society of Anesthesiologists (ASA) Grade I and II; 2. no airway, maxillofacial, cervical anatomical abnormalities; 3. undergoing elective surgeries with general anaesthesia.
Exclusion criteria
Exclusion criteria: 1. American Society of Anesthesiologists (ASA) Grade III and IV; 2. age<18 years 3. airway, maxillofacial , cervical anatomical abnormalities; 4. intolerance to ultrasonography; 5. intolerance to tongue depressor; 6. without neuromuscular blocking agents and neuromuscular transmission monitoring; 7. endotracheal intubation without direct laryngoscop; 8. allergy to electrically conductive gel and ultrasonic couplant.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| angle a:angle between line of tongue depressor and line of vision;distance between caudal edge of arytaenoidea cartilago and line of tongue depressor; | — |
Secondary
| Measure | Time frame |
|---|---|
| DSEM-distance between skin and epiglottis;DSHB-distance between skin and hyoid bone;DSMA-distance between skin and midpoint of arytenoids;distance between skin and line of tongue depressor at the level of hyoid bone;soft tissue thickness along the line of hyoid bone's shadow;Length of vertical line between hyoid to the line of tongue depressor; | — |
Countries
China
Contacts
Public ContactLi Dewei
the Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine
Outcome results
None listed