Wang et al reported 2 nomograms for predicting difficult laryngoscopy.The second predicts the likelihood of difficult tracheal intubation.The authors are from Arhui Medical University and Wannan Medical College in China.
Patient selection: tracheal intubation and general anesthesia
Parameters:
(1) upper lip bite test, Grades I to III
(2) temporomandibular joint mobilitiy by mandibular condylar mobility measured by ultrasonography in mm
(3) age in years
(4) interincisor distance in mm
(5) tongue thickness by ultrasonography in mm
Parameter
Finding
Points
upper lip bite test
Grade I
0
Grade II
25.2
Grade III
43
TMJ mobility
>= 11 mm
0
< 11 mm
100
age in years
< 32 years
0
32 to 57 years
3.7
>= 58 years
30
interincisor distance
< 35 mm
58
35 to 40 mm
21.2
>= 40 mm
0
tongue thickness
< 55 mm
0
55 to 62 mm
48
> 62 mm
89
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 320
value of X =
= (0.03799 * (score)) - 10.49
probability of difficult laryngoscopy =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.97.
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