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Κυριακή 13 Ιανουαρίου 2019

Bedside clinical tests as a screening tool for predicting difficult laryngoscopy and intubation


: An observational study
p. 9
Hemlata V Kamat, Manoj Raju Prabandhankam, Bhumika Pathak, Ajay Phatak
DOI:10.4103/ARWY.ARWY_6_18  
Context: Morphological characteristics of the airway in a population have regional variations making airway assessment and management a crucial aspect of anaesthesia practice. Aims: (1) To determine the incidence of difficult laryngoscopy and intubation using Cormack–Lehane grading and Intubation Difficulty Scale (IDS). (2) To assess the accuracy of bedside clinical tests in predicting difficult laryngoscopy and intubation. Settings and Design: Prospective observational study was carried out on 200 patients aged 18–70 years, undergoing planned surgical procedures under general anaesthesia requiring endotracheal intubation. Pregnant women, patients with head-and-neck pathology, and patients with trauma were excluded from the study. Patients and Methods: All patients underwent preoperative airway assessment and standard induction procedure. Cormack–Lehane grading was noted during first laryngoscopy and process of intubation evaluated by IDS. Statistical Analysis Used: Descriptive statistics used to depict baseline profile. Chi-square, Student t-test and logistic regression used to determine adjusted effects. Analysis was performed using STATA (14.2). Results: The incidence of difficult laryngoscopy was 15.5% and difficult intubation was 12.5%. Univariate analysis showed body mass index (BMI) >25 kg/m2, neck circumference (NC) >36 cm and modified Mallampati score 3/4 as significant predictors. Logistic regression showed interincisor gap (IIG) (P < 0.001) and NC (P < 0.001) as significant predictors. Conclusions: NC and IIG are rapid, simple bedside tests to predict difficult intubation. Bedside clinical tests have poor discriminative power but still have a role in choosing alternative methods for airway management, making judicious use of time and resources while causing minimum discomfort to the patient.

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