Ontario Paramedic Practice Exam

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What is a biphasic reaction?

A reaction that requires two doses of epinephrine
A reaction with delayed onset of symptoms
A recurrence of anaphylaxis after appropriate treatment
A reaction that involves multiple allergens

The correct answer is: A recurrence of anaphylaxis after appropriate treatment

A biphasic reaction is a recurrence of anaphylaxis after appropriate treatment. This means that after an initial episode of anaphylaxis, there is a second onset of symptoms even though the first episode was successfully treated. The other options are incorrect because A) While two doses of epinephrine may be necessary in some cases, it is not a defining characteristic of a biphasic reaction. B) A delayed onset of symptoms can occur in some cases, but it is not a specific type of reaction. D) An allergic reaction involving multiple allergens would not necessarily be classified as a biphasic reaction unless there is a recurrence of symptoms after successful initial treatment.