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BioMed Research International
Volume 2017 (2017), Article ID 3075756, 7 pages
Research Article

The Performance of the Intubation Difficulty Scale among Obese Parturients Undergoing Cesarean Section

1Anesthesiology Department, Prasat Neurological Institute, Bangkok, Thailand
2Department of Anesthesiology, Maharat Nakhon Ratchasima Hospital, Nakhon Ratchasima, Thailand
3Department of Internal Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
4Department of Anesthesiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand

Correspondence should be addressed to Arunotai Siriussawakul;

Received 30 May 2016; Revised 15 November 2016; Accepted 4 January 2017; Published 26 January 2017

Academic Editor: Erwin van Wegen

Copyright © 2017 Jatuporn Eiamcharoenwit et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. There have not yet been any studies to validate the intubation difficulty scale (IDS) in obese parturients. Objectives of this study were to determine the performance of the IDS in defining difficult intubation (DI) and to identify the optimal cutoff points of the IDS among obese parturients. Methods. This was a prospective observational study. Parturients with a body mass index ≥ 30 kg/m2 who underwent cesarean section utilizing endotracheal intubation were enrolled. The intubating performers were asked to assess the difficulty of endotracheal intubation and categorize it as easy, somewhat DI, and DI. Main Results. A total of 517 parturients were recruited with a mean BMI of 33.9 kg/m2. The incidence of some degree of DI was 14.5%. The area under the receiver operating characteristic curves of the IDS for detecting somewhat DI and DI was 1.0. The optimal cutoff point to define somewhat DI was ≥3 and DI was ≥5, which both had sensitivity and specificity of 100%. Conclusions. The IDS scoring is a good tool for defining DI among obese parturients. The IDS scores of ≥3 and ≥5 are the optimal cutoff points to define somewhat DI and DI, respectively.