Emergency medical services bring a 68-year-old male resident of a nursing facility to the acute care bay after he developed acute-onset confusion and profound weakness. Staff report he complained of severe right-sided abdominal pain earlier in the day. His medical history is significant for asymptomatic gallstones. On evaluation, his core temperature is 39.2°C (102.6°F), blood pressure is 88/54 mmHg, and heart rate is 118/min. Physical examination is notable for marked scleral icterus and right upper quadrant tenderness with involuntary guarding. Laboratory studies demonstrate a leukocytosis of 18,500/mm³ and a total bilirubin of 6.5 mg/dL. Arrange the following management steps in the most appropriate chronological order to optimize this patient's clinical outcome.
- 1Obtain peripheral blood cultures and initiate aggressive intravenous crystalloid resuscitation
- 2Administer empiric broad-spectrum intravenous antibiotics
- 3Perform a transabdominal right upper quadrant ultrasound
- 4Perform an urgent endoscopic retrograde cholangiopancreatography (ERCP)
- 5De-escalate to targeted narrow-spectrum antibiotics based on culture susceptibility results