system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 40-year-old man presents with acute abdominal pain. Past medical history is significant for hepatitis C, complicated by multiple recent visits with associated ascites. His temperature is 38.3°C (100.9°F), heart rate is 115/min, blood pressure is 88/48 mm Hg, and respiratory rate is 16/min. On physical examination, the patient is alert and in moderate discomfort. Cardiopulmonary examination is unremarkable. Abdominal examination reveals distant bowel sounds on auscultation. There is also mild diffuse abdominal tenderness to palpation with guarding present. The remainder of the physical examination is unremarkable. A paracentesis is performed. Laboratory results are significant for the following:
Leukocyte count 11,630/µL (with 94% neutrophils)
Platelets 24,000/µL
Hematocrit 29%
Ascitic fluid analysis:
Cell count  658 PMNs/µL
 Total protein 1.2 g/dL
 Glucose 24 mg/dL
Gram stain  Gram-negative rods
Culture Culture yields growth of E. coli
Which of the following is the next, best step in the management of this patient?
assistant
Intravenous cefotaxime