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  • Snapshot
    • A 33-year-old man presents to the emergency department with new-onset vision blurriness with "flashing lights." His symptoms began approximately 4 days prior to presentation and have progressively worsened. He occasionally sees floaters, and his symptoms affect both eyes but are more severe on the left eye. He has a past medical history of HIV infection and reports to not taking his medication for the past year. Ophthalmology was consulted and performed a dilated ocular exam. Indirect ophthalmoscopy demonstrated 1-2 yellow-white foci of disease in a perivascular distribution accompanied by retinal hemorrhage in a "brush fire" pattern. His CD4+ count is 39/uL. She is started on cidofovir and antiretroviral therapy. (Cytomegalovirus retinitis)
  • Introduction
    • Mechanism of action
      • acts as a nucleotide analog, by which it competitively inhibits nucleotide (deoxycytidine triphosphate) incorporation into viral DNA by viral DNA polymerase
        • no viral kinase activity is required for activation of cidofovir (in contrast to ganciclovir)
        • however, host cell kinases still required for activation
    • Mechanism of resistance
      • altered viral DNA polymerase
    • Clinical use
      • cytomegalovirus (CMV) infection
        • CMV retinitis
      • acyclovir-resistant herpes simplex virus infections
    • Adverse effects
      • dose-dependent nephrotoxicity
        • monitored by checking serum creatinine and urine protein
        • nephrotoxicity can be reduced with hydration and probenecid
      • ophthalmologic disturbances due to toxicity to ciliary body
        • iritis
        • uveitis
        • decreased intraocular pressure
        • possible vision loss
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