An unseen obstruction.
Stanley
B
B
Roe
P
P
D000402:Airway Obstruction / Q000209:etiology*; D002648:Child; D004868:Equipment Failure; D006801:Humans; D008397:Masks / Q000009:adverse effects*; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation; D011183:Postoperative Complications