Review Question - QID 212747

A 57-year-old man presents to the emergency department with chest and back pain. He states that his symptoms started suddenly 1 hour ago and have persisted. He has a past medical history of hypertension and diabetes. His routine blood counts and metabolic panel 1 month prior were within normal limits. His temperature is 98.5°F (36.9°C), blood pressure is 168/111 mmHg, pulse is 95/min, respirations are 14/min, and oxygen saturation is 99% on room air. Physical exam is notable for an uncomfortable man but is otherwise within normal limits. An initial ECG is unremarkable. Laboratory values are ordered as seen below.

Hemoglobin: 15 g/dL
Hematocrit: 45%
Leukocyte count: 6,300/mm^3 with normal differential
Platelet count: 222,000/mm^3

Serum:
Na+: 141 mEq/L
Cl-: 103 mEq/L
K+: 4.5 mEq/L
HCO3-: 24 mEq/L
BUN: 42 mg/dL
Glucose: 129 mg/dL
Creatinine: 1.9 mg/dL
Ca2+: 10.2 mg/dL

Which of the following is the best next step in management?