Review Question - QID 213397

A 55-year-old man with a history of IV drug abuse presents to the emergency department with an altered mental status. He was found unconscious in the park by police. His temperature is 100.0°F (37.8°C), blood pressure is 87/48 mmHg, pulse is 150/min, respirations are 17/min, and oxygen saturation is 98% on room air. Physical exam is notable for multiple scars and abscesses in the antecubital fossa. His laboratory studies are ordered as seen below.

Serum:
Na+: 139 mEq/L
Cl-: 105 mEq/L
K+: 4.3 mEq/L
HCO3-: 19 mEq/L
BUN: 20 mg/dL
Glucose: 95 mg/dL
Creatinine: 1.5 mg/dL
Ca2+: 10.2 mg/dL

Which of the following is the most appropriate treatment for this patient’s blood pressure and acid-base status?