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EMS has brought in an 8 month old child who had a generalized tonic-clonic seizure at home. The child has a history of 2 prior febrile seizures, starting at age 6 months, and is not on any long-term anticonvulsants. There is no other significant PMH. The child was given IM Ativan 1mg by EMS with resolution after 10 total minutes of seizure. Vital signs are temp 37.9, HR 160, RR 10, BP 72/42, O2 sat 90% room air, weight 7 kg, POC glucose 110. An IV is now in place. What is the MOST appropriate first intervention, assuming all can be instituted within the same amount of time?

What is the MOST appropriate first intervention?