Q. A 58-year-old presents due to the emergency department due to a suicide attempt. His wife found him lying on the bathroom floor unable to get himself up. In addition, she found a suicide note. The patient's past medical history is noticeable for coronary artery disease and hypertension. His temperature is 37.7C (100F), his blood pressure is 76/40 mm Hg, pulse is 40/min, and respiratory rate is 12 beats per minute. Chest examination reveals diffuse wheezing sounds bilaterally.  The patient’s extremities are cold and clammy. An electrocardiogram reveals sinus bradycardia and a first-degree atrioventricular block. The patient is managed with intravenous fluids and atropine but does not improve. Which of the following is the best next step?