A client who is in shock is receiving norepinephrine in addition to IV fluids. What principle should influence the nurse's care planning during the administration of a vasoactive drug?

The drug should be discontinued immediately after blood pressure increases.

The drug dose should be tapered down once vital signs improve.

The client should have arterial blood gases drawn every 10 minutes during treatment.

The infusion rate should be titrated according to client's subjective sensation of adequate perfusion.