The definition of a possum, or opossum, is a tree-dwelling nocturnal marsupial with fur and a prehensile tail. A small Australian mammal that lives in a tree and only comes out at night is an example of a possum. possum. possum.
More than two thirds of patients who die of anaphylaxis do so within the first: half hour. ____, a harsh, high-pitched inspiratory sound, occurs when swelling in the upper airway closes off the airway; the swelling can eventually lead to total obstruction. Stridor.
What to do if someone has anaphylaxis. Anaphylaxis is a medical emergency. It can be very serious if not treated quickly. If someone has symptoms of anaphylaxis, you should: call 999 for an ambulance immediately â mention that you think the person has anaphylaxis.