A febrile patient with flank pain and fever is suspected to have acute pyelonephritis. What is a typical initial management approach in nonpregnant adults?

• A. Prolonged IV antibiotics with culture-guided therapy
• B. No antibiotics
• C. Short course broad-spectrum antibiotics with consideration of culture results and risk factors
• D. Surgery

Answer: (C)

In suspected acute pyelonephritis for a nonpregnant adult, the best initial approach is to treat promptly with broad-spectrum antibiotics after obtaining a urine culture, then tailor therapy based on culture results and the patient’s risk factors. This means starting an empiric regimen that covers the common gram-negative pathogens (such as E. coli and related enteric organisms) and, if the patient is able to take oral meds and is not severely ill, moving to a short course of therapy that commonly lasts around 5–7 days. The culture results help fine-tune the choice of antibiotic and duration, especially if resistance patterns or patient risks (like prior antibiotic exposure, healthcare-associated infection, diabetes, stones, or catheter use) come into play.

This approach contrasts with not treating with antibiotics, which would allow the infection to worsen, or with prolonged inpatient IV therapy in all cases, which isn’t necessary for most nonpregnant adults with uncomplicated disease. Surgery isn’t indicated unless there is a discrete complication such as an abscess or obstructive obstruction.