Q. A 17-year-old male patient presents to the clinic with complaints of increased thirst, urination, and unexplained weight loss over the past two weeks. He has a history of type 1 diabetes and was diagnosed three years ago. His blood glucose levels were well-controlled with insulin and a strict diet. However, he has been non-compliant with his medications and dietary restrictions for the past few months. On physical examination, his blood pressure is 120/80 mmHg, his pulse is 90 beats per minute, and his respiratory rate is 18 breaths per minute. His BMI is 21.3 kg/m2. He has dry mucous membranes and stroke-like breathing. Laboratory results reveal a blood glucose level of 480 mg/dL, ketones in the urine, and a serum pH of 7.30. The patient is diagnosed with diabetic ketoacidosis. Which of the following is the next best step in the management of this patient?