Comparison between El-Ganzouri risk index and sonologically measured skin-to-epiglottis distance for predicting difficult laryngoscopy: A prospective observational study

Sonologically measured SED is a better parameter in terms of sensitivity and specificity to predict the difficulty in laryngoscopy than EGRI, and the combination of EGRI with SED increases the accuracy of EGRI alone. In this study, a new cut-off value of 15 mm was obtained from the coordinates of the ROC curve for SED measurement, even though 18 mm was used in this study.