Review Question - QID 210412

A 67-year-old man presents to the emergency room with malaise, nausea, and vomiting. Four hours prior to presentation, he was spraying insecticide at his farm when he started feeling nauseous. He has had multiple episodes of diarrhea and has vomited non-bloody, non-bilious fluid twice. He also complains of muscle cramps and tremors. His past medical history is notable for hypertension, diabetes, hyperlipidemia, and a prior myocardial infarction. He takes aspirin, metoprolol, metformin, lisinopril, and atorvastatin. He has a 40-pack-year smoking history and drinks 3-4 shots of whiskey per day. His temperature is 98.6°F (37°C), blood pressure is 148/88 mmHg, pulse is 96/min, and respirations are 22/min. He is alert and oriented to person and place but not to time. He is diaphoretic and tremulous. His pupils are 2 mm bilaterally. The patient's clothing is removed, and he is placed in a medical gown. Which of the following is the most appropriate initial treatment for this patient?