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Difficulty: MediumInfectious Diseases

Match each clinical presentation of an opportunistic infection in a patient with advanced HIV to the most appropriate initial targeted pharmacotherapy regimen.

  • A 34-year-old man presenting with a 2-week history of worsening headache and photophobia; cerebrospinal fluid analysis demonstrates encapsulated yeast cells.Intravenous liposomal amphotericin B and oral flucytosine
  • A 41-year-old woman presenting with progressive visual blurring and floaters; funduscopic examination reveals extensive yellow-white retinal infiltrates with associated perivascular hemorrhage.Oral valganciclovir
  • A 28-year-old man presenting with a 3-week history of dry cough and exertional dyspnea; arterial blood gas shows a PaO2 of 62 mm Hg, and chest radiography reveals diffuse bilateral ground-glass opacities.Intravenous trimethoprim-sulfamethoxazole and oral prednisone
  • A 39-year-old woman presenting with a new-onset generalized tonic-clonic seizure and right-sided hemiparesis; brain magnetic resonance imaging reveals multiple ring-enhancing lesions predominantly in the basal ganglia.Oral sulfadiazine, oral pyrimethamine, and oral leucovorin

Answer

The presentation of cryptococcal meningitis pairs with amphotericin B and flucytosine. The presentation of CMV retinitis pairs with valganciclovir. The presentation of severe PCP pairs with trimethoprim-sulfamethoxazole and prednisone. The presentation of toxoplasmic encephalitis pairs with sulfadiazine, pyrimethamine, and leucovorin.
Each clinical scenario describes a classic presentation of a specific opportunistic infection in advanced HIV. The correct antimicrobial regimen must be precisely tailored to the identified pathogen (fungal, viral, or protozoal) and the severity of the disease.

Step-by-Step Solution

1
Identify the underlying opportunistic pathogen for each clinical vignette based on the provided diagnostic clues and physical exam findings.
The vignettes describe cryptococcal meningitis, cytomegalovirus (CMV) retinitis, severe Pneumocystis jirovecii pneumonia (PCP), and toxoplasmic encephalitis, respectively.
Accurate clinical diagnosis of the specific opportunistic infection is the prerequisite for selecting the appropriate targeted antimicrobial therapy.
2
Select the first-line pharmacological regimen indicated for each identified pathogen, accounting for disease severity and required adjunctive therapies.
Cryptococcus requires amphotericin B and flucytosine. CMV requires valganciclovir. Severe PCP requires TMP-SMX with corticosteroids. Toxoplasmosis requires sulfadiazine, pyrimethamine, and leucovorin.
Guideline-directed therapy ensures rapid clearance of the infectious organism, minimizes morbidity, and actively anticipates medication-induced or inflammatory toxicities.

Key Concept

Pharmacotherapy for opportunistic infections in advanced HIV
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Topics

Infectious Diseases

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