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ADPKD Cyst Infection Antibiotics — ESENeph MCQ

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ModeratePolycystic Kidney DiseaseADPKD Cyst Infection AntibioticsESENeph

A 55-year-old man with ADPKD and eGFR 35 mL/min/1.73m2 develops recurrent urinary tract infections. CT shows infected renal cysts. Standard antibiotics (Amoxicillin) have been ineffective. What antibiotic property is important for treating infected renal cysts?

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Correct answer: D — Ability to penetrate cyst walls – lipophilic antibiotics (Fluoroquinolones, Co-trimoxazole) are preferred

Renal cysts in ADPKD are relatively avascular, so many antibiotics (including beta-lactams and aminoglycosides) poorly penetrate the cyst wall. Lipophilic antibiotics that can cross the cyst epithelium are preferred: Fluoroquinolones (Ciprofloxacin, Levofloxacin) and Co-trimoxazole achieve good cyst concentrations. Treatment duration is typically prolonged (2-4 weeks). If infection does not respond, cyst drainage may be needed. CT or MRI can help identify the infected cyst.

Reference: Chapman et al 2015 – ADPKD Management; Sallée et al 2009 – Cyst Infection ADPKD