RT Book, Section A1 Sachs, Adam A2 Atchabahian, Arthur A2 Gupta, Ruchir SR Print(0) ID 57260211 T1 Chapter 2. Predicting Difficult Mask Ventilation and Intubation T2 The Anesthesia Guide YR 2013 FD 2013 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-176049-2 LK accessanesthesiology.mhmedical.com/content.aspx?aid=57260211 RD 2024/04/23 AB Overall incidence of difficult mask ventilation (DMV) is 1.4% with impossible mask ventilation (IMV) 0.15%Obesity, snoring, and lack of teeth can probably be overcome with simple airway maneuvers, which is why they are not risk factors for IMV:Lack of teeth actually makes DL and intubation easierNeck circumference (> 50 or 60 cm at the level of the cricoid cartilage) is the most predictive factor of IMVPatients with three or more risk factors have a much higher likelihood of being IMV (odds ratio 8.9)Most patients (75%) who are IMV will be easy to intubate