A 55-year-old man presents to the emergency department with fever (102.5°F/39.2°C), altered mental status, heart rate of 115 bpm, respiratory rate of 28 bpm, and blood pressure of 88/50 mmHg. His lactate is 4.5 mmol/L. What is the most critical immediate management step?

The correct answer to the question "A 55-year-old man presents to the emergency department with fever (102.5°F/39.2°C), altered mental status, heart rate of 115 bpm, respiratory rate of 28 bpm, and blood pressure of 88/50 mmHg. His lactate is 4.5 mmol/L. What is the most critical immediate management step?" is Option A: Administer broad-spectrum intravenous antibiotics..

The other options — B) Obtain a stat head CT scan., C) Order a comprehensive metabolic panel and complete blood count., D) Insert a central venous catheter for CVP monitoring. — are incorrect for this USMLE Exam Prep question. As explained above: This patient meets criteria for septic shock. The most critical immediate step is to administer broad-spectrum antibiotics within one hour to improve outcomes, along with prompt fluid resuscitation.