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.
Signs and symptoms of anaphylaxis include: 1  A swollen throat or a lump in your throat (airway constriction) that makes it difficult for you to breathe. 2  Shock, with a severe drop in your blood pressure. 3  Rapid pulse. 4  Dizziness, lightheadedness or loss of consciousness.