Post myocardial infarction, a patient's cardiac profile and serum chemistry results show the following values:
Heart rate: 120 bpm
Blood pressure: 80/40 mm Hg
Pulmonary capillary Wedge pressure: 6 mm Hg
Right atrial pressure: 2 mm Hg
Cardiac index: 2.3 L/min/m2
Sodium: 136 mEq/L
Potassium: 4.2 mEq/L
Chloride: 98 mEq/L
Bicarbonate: 22 mEq/L
Blood urea nitrogen: 25 mg/dL
Creatinine: 1.0 mg/dL
Glucose: 110 mg/dL
Which one of the following therapeutic regimens is most appropriate for the initial treatment of this patient?