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You are managing a 1yo patient with submersion injury who has respiratory distress and falling O2 saturation. You begin bag-valve-mask ventilation as you prepare to intubate the patient, using a 450mL self-inflating bag with oxygen at 10 L/minute, bagging at a rate of 20 breaths/minute. You note that the patient is not improving and there is poor chest rise, so you insert a correctly sized and placed nasopharyngeal airway. The patient is still not improving and has poor chest rise – after repositioning, which is the best intervention?