Prevalence and Prediction of Difficult Intubation in Chinese Women

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Abstract
We conducted a prospective, blind observational study to investigate the prevalence and prediction of difficult intubation in Chinese women. Two groups of Chinese women were studied (151 pregnant and 260 non-pregnant). The prevalence of difficult intubation was 1.99% in the pregnant and 1.54% in the non-pregnant group. The difference was not statistically significant. Predictive variables for difficult intubation, including modified Mallampati class, thyromental distance and atlanto-occipital extension, had high sensitivity but low positive predictive value when used alone. A shorter thyromental distance had to be used as the criterion for prediction in Chinese women. Combination of predictive variables could improve the positive predictive value.

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