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  • Title: Thyromental height test as a new method for prediction of difficult intubation with double lumen tube.
    Author: Palczynski P, Bialka S, Misiolek H, Copik M, Smelik A, Szarpak L, Ruetzler K.
    Journal: PLoS One; 2018; 13(9):e0201944. PubMed ID: 30212462.
    Abstract:
    BACKGROUND: Predicting difficult intubation is of high clinical interest. METHODS: 237 patients aged ≥18 years were included in the study. Preoperative airway evaluation included: Mallampati test, thyromental distance, sternomental distance and thyromental height test. During direct laryngoscopy Cormack & Lehane classification was graded. We calculated the ROC AUC, sensitivity and specificity for thyromental height test as a primary end point of our study. RESULTS: Only thyromental height test and Cormack-Lehane scale proved significant on occurrence of difficult intubation. The optimal sensitivity and specificity values of thyromental height test were met with a cut off value of 50 mm. With 1 mm increase in thyromental height test, risk of difficult intubation decreased by 7%. CONCLUSION: Thyromental height test is a simple, easy to perform and non-invasive test to predict difficult intubation in patients scheduled for elective double lumen tube intubation during thoracic surgical procedures. With 1 mm above 50 mm increase in thyromental height test the risk of difficult intubation decreased by 7%. TRIAL REGISTRATION: Clinicaltrials.gov Identifier: NCT02988336.
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