A client with narcolepsy receives a new prescription for methylphenidate. Prior to administration of the medication, the nurse should review the medical record for which condition?

A. Hypercholesterolemia is not a primary concern when prescribing methylphenidate. B. Bronchitis does not significantly affect the use of methylphenidate. C. Diabetes mellitus requires careful monitoring but is not the primary condition to assess before starting methylphenidate. D. Methylphenidate is a stimulant and can exacerbate hypertension, so it is crucial to review the client's blood pressure and overall cardiovascular health before administration.