Nasal ventilation has shown better efficacy than nasal-mouth ventilation in multiple clinical trials

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1) Continuous positive airway pressure and ventilation are more effective with a nasal mask than a full face mask in unconscious subjects: a randomized controlled trial

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2) Effectiveness of Breathing through Nasal and Oral Routes in Unconscious Apneic Adult Human Subjects: A Prospective Randomized Crossover Trial 

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3) Magnetic Resonance Imaging of the Upper Airway: Effects of Propofol Anesthesia and Nasal Continuous Positive Airway Pressure in Humans

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4) Nasal mask ventilation is better than face mask ventilation in edentulous patients

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5) Nasal Ventilation Is More Effective than Combined Oral–Nasal Ventilation during Induction of General Anesthesia in Adult Subjects

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6) The effectiveness of nasal mask vs face mask ventilation in anesthetized, apneic pediatric subjects over 2 years of age: a randomized controlled trial

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Risk Factors for Difficult Mask Ventilation

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1) Prehospital Manual Ventilation: An NAEMSP Position Statement and Resource Document

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2) Difficult Intubation: An Analysis of 2000 Incident Reports

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3) Difficult mask ventilation in general surgical population: observation of risk factors and predictors

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4) Prediction of Difficult Mask Ventilation