• Br J Anaesth · Aug 1988

    Predicting difficult intubation.

    • M E Wilson, D Spiegelhalter, J A Robertson, and P Lesser.
    • Department of Anaesthesia, Royal United Hospital, Bath.
    • Br J Anaesth. 1988 Aug 1; 61 (2): 211-6.

    AbstractThe amount of larynx seen at intubation was assessed in 633 adult patients undergoing routine surgery. Various measurements of the head and neck were made in an attempt to discover which features were associated with difficulty with laryngoscopy (defined as the inability to see even the arytenoids). In addition 38 patients, reported by colleagues because they had been "difficult to intubate", were measured. Five useful risk factors, measured at three levels of severity, were identified. A simple predictive rule was developed and tested on a prospective set of 778 patients, in 1.5% of whom laryngoscopy was found to be difficult. Depending on the threshold chosen, the rule allowed the detection of, for example, 75% of the "difficult" laryngoscopies at a cost of falsely identifying 12% of the "not difficult" patients.

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