Pyelonephritis: The Daily PANCE Blueprint
A 26-year-old otherwise healthy woman presents with two days of fever to 38.8°C, shaking chills, right-sided flank pain, and burning with urination. She has nausea but no vomiting, is tolerating oral fluids, and is not pregnant. On exam she has marked right costovertebral angle tenderness; her vital signs are otherwise stable. Urinalysis shows pyuria, bacteriuria, and white-cell casts. You decide she can be managed as an outpatient. Which of the following is the most appropriate empiric oral antibiotic?
A. Ciprofloxacin (a fluoroquinolone)
B. Nitrofurantoin
C. Fosfomycin
D. Amoxicillin
E. Oral vancomycin
Answer and topic summary
The answer is A. Ciprofloxacin (a fluoroquinolone).
Fever, flank pain, costovertebral angle tenderness, and white-cell casts point to acute pyelonephritis — an infection of the kidney itself, not just the bladder. For an outpatient who is stable and tolerating orals, an oral fluoroquinolone such as ciprofloxacin is the preferred empiric choice because it reaches high concentrations in kidney tissue. The trap is nitrofurantoin (and fosfomycin): both are excellent for simple cystitis but concentrate in the urine and do not achieve adequate levels in the renal parenchyma, so they are inappropriate for pyelonephritis. Amoxicillin alone has too much E. coli resistance for reliable empiric use, and oral vancomycin is not absorbed systemically (it is used for C. difficile colitis).
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Covered under ⇒ PANCE Blueprint Genitourinary ⇒ Infectious and Inflammatory Conditions ⇒ Pyelonephritis
