Infections in CKD

CKD Managementmedium

A pregnant woman with CKD is seen for a routine first-trimester visit. She is asymptomatic, but a screening urine culture grows Escherichia coli at greater than 100,000 CFU/mL. Which of the following is the most appropriate antibiotic to treat her asymptomatic bacteriuria?

  1. A.Nitrofurantoin
  2. B.Ciprofloxacin
  3. C.AmoxicillinCorrect
  4. D.Trimethoprim-sulfamethoxazole

Explanation

Asymptomatic bacteriuria must be treated in pregnancy to prevent pyelonephritis and preterm labor. Among these options, a beta-lactam such as amoxicillin (guided by susceptibilities) is the safest choice across all trimesters. Fluoroquinolones (ciprofloxacin) are avoided in pregnancy due to fetal cartilage/musculoskeletal concerns. Nitrofurantoin and trimethoprim-sulfamethoxazole are relatively avoided in the first trimester (and near term for nitrofurantoin/sulfa hemolysis and kernicterus risk), making them poor choices for this first-trimester patient.

Why each option

A.
Incorrect. Nitrofurantoin is avoided in the first trimester and near term (neonatal hemolysis) and is best reserved for the second trimester.
B.
Incorrect. Fluoroquinolones are avoided in pregnancy.
C.
Correct. Amoxicillin (susceptibility-guided) is safe throughout pregnancy and appropriate here.
D.
Incorrect. Trimethoprim-sulfamethoxazole is avoided in the first trimester (antifolate/neural tube risk) and near term (kernicterus).

Reference: Nicolle LE et al. IDSA 2019 Clinical Practice Guideline for the Management of Asymptomatic Bacteriuria. Clin Infect Dis. 2019;68(10):e83-e110; ACOG guidance on UTI in pregnancy.

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