Final answer:
The most important side effect of epinephrine administration in an adolescent is tachycardia.
Step-by-step explanation:
The most important side effect for the nurse to identify after the administration of epinephrine in an adolescent is tachycardia (a).
Epinephrine is a medication that stimulates the sympathetic nervous system, leading to increased heart rate and cardiac output. Tachycardia is an abnormally fast heart rate, and it is a common side effect of epinephrine administration.
Hypoglycemia (b) is not a common side effect of epinephrine administration. Epinephrine can actually raise blood sugar levels by promoting the breakdown of glycogen into glucose.
Constricted pupils (c) are not a side effect of epinephrine administration. Norepinephrine, a similar medication, constricts pupils.
Decreased blood pressure (d) is not the most important side effect to identify after the administration of epinephrine. Epinephrine increases blood pressure by constricting blood vessels.