| Anatomical Factors to Discriminate Difficult Tracheal Intubation in Micrognathia. |
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Kyung Tae Kim, Seung Hong Lee, Cheol Hoi Hur, Mun Cheol Kim, Kang Hee Cho |
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Department of Anesthesiology, College of Medicine, Inje University, Seoul, Korea. |
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| Abstract |
BACKGROUND
Micrognathia is the prime, constant bony finding that signals trouble for access to the airway. Anatomical factors of difficult tracheal intubation in micrognathia have been evaluated.
METHOD
Forty one patients with micrognathia were divided into 3 groups based on modified Mallampati classification.
Lateral cephalometric view taken preoperatively was used to measure 13 anatomical factors. Kruskal-Wallis test and discriminant analysis were used to select the most predictable factors for distinguishing between the difficult and easy groups.
RESULTS
The most discriminating factors are mandibulo-hyoid distance(V12), atlanto-occipital distance(V10) and mentum-hyoid distance(V11). The discriminant analysis using above 3 factors gives the following discriminant functions(Y1= 0.7924(V12) - 0.2154(V10) - 0.3531(V11) (discriminant function 1), Y2= -0.2177(V12) + 0.8221(V10) -0.6304(V11) (discriminent fuction 2)) and the discriminating power of difficult intubation is 72.9%.
CONCLUSIONS
Modified Mallampati classification and lateral cephalometric assessment of 3 anatomical factors can predict the difficult intubation. |
| Key Words:
Anatomy: micrognathia; Intubation: tracheal, difficult |
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