Difficult mask ventilation: Predictor


Difficult mask ventilation (DMV), defined as: “the inability of an unassisted anesthesiologist to maintain SpO2 >92%” is an uncommon but important scenario.  Incidence of DMV in various studies has ranged from around 0.5 - 5%, with the largest review reporting an incidence of around 1%.  Unfortunately DMV is difficult to predict, with one study reporting that only 17% of people found to have DMV had been predicted to have DMV.  Importantly, patients who are difficult to mask ventilate have up to a fourfold higher incidence of being a difficult intubation that those who were easy to mask.  Predictors of difficult mask ventilation include the following:

Patients with 3 risk factors had a 20 fold greater incidence of DMV (around 5%) than those with 0 risk factors (incidence 0.25%).


    Keys to the Cart: February 13, 2017; A 5-minute video review of ABA Keywords

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Answered correctly


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Answered correctly


Year asked

Pablo Kollmar, MD