Mouth to barrier techniques, which incorporate a plastic sheet with a central filter with or without a bite block, remove the need for direct contact with the patient. Mouth to mouth ventilation can also be performed via a Brooke airway with a valve which directs expired air away from the rescuer. The Laerdal flat pack pocket mask is a frequently employed device. Those variants having an oxygen inlet nipple also overcome the second disadvantage of basic EAR, that of delivery of a low inspired oxygen tension.
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