A nurse is caring for an adolescent client who has a long history of diabetes mellitus and is being admitted to the emergency department confused, flushed, and with an acetone odor on the breath. Diabetic ketoacidosis is suspected. The nurse should anticipate using which of the following types of insulin to treat this client?

Choice A reason: Insulin detemir is a long-acting insulin analog, providing basal coverage over 12-24 hours by binding to albumin, slowing absorption. In diabetic ketoacidosis (DKA), rapid correction of hyperglycemia and acidosis requires short-acting insulin like regular insulin, as detemir’s slow onset cannot address acute metabolic decompensation effectively. Choice B reason: NPH insulin is an intermediate-acting insulin with an onset of 1-2 hours and duration of 12-18 hours. Its delayed action makes it unsuitable for DKA, where rapid-acting insulin is needed to quickly lower blood glucose and suppress ketogenesis, preventing further acidosis and metabolic deterioration. Choice C reason: Insulin glargine, a long-acting insulin, provides steady basal coverage over 24 hours with no peak. Its slow, sustained release is inappropriate for DKA, which demands immediate, titratable insulin to rapidly correct hyperglycemia, ketonemia, and acidosis, restoring metabolic balance in an acute emergency setting. Choice D reason: Regular insulin, a short-acting insulin, has an onset of 30 minutes and duration of 3-6 hours, making it ideal for DKA treatment. Administered intravenously, it rapidly lowers blood glucose, suppresses ketone production, and corrects acidosis by facilitating glucose uptake and inhibiting lipolysis, stabilizing the patient’s metabolic state.