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Difficulty: HardInfectious Diseases

Match each clinical presentation of an immunocompromised patient with advanced HIV infection to the most appropriate initial targeted pharmacologic therapy.

  • A 3434-year-old man presents with new-onset floaters, photophobia, and decreased visual acuity. Fundoscopy reveals yellow-white retinal exudates with adjacent areas of hemorrhage along the vascular arcades.Oral valganciclovir or systemic ganciclovir
  • A 4242-year-old woman presents with a subacute onset of severe headache, low-grade fever, and malaise. Lumbar puncture reveals elevated opening pressure, lymphocytic pleocytosis, and encapsulated yeast cells on an India ink stain.Intravenous liposomal amphotericin B and oral flucytosine
  • A 2929-year-old man presents with new-onset focal seizures and right-sided hemiparesis. MRI of the brain demonstrates multiple ring-enhancing lesions with surrounding edema, predominantly located in the basal ganglia.Oral sulfadiazine, pyrimethamine, and leucovorin
  • A 3838-year-old man presents with a 33-week history of progressive dyspnea on exertion and a dry, nonproductive cough. Chest radiograph shows diffuse, bilateral interstitial infiltrates, and arterial blood gas reveals a PaO2PaO_2 of 6565 mm Hg.Intravenous trimethoprim-sulfamethoxazole and systemic corticosteroids

Answer

The correct matches pair the CMV retinitis presentation with valganciclovir/ganciclovir; the Cryptococcal meningitis presentation with liposomal amphotericin B and flucytosine; the Toxoplasma encephalitis presentation with sulfadiazine, pyrimethamine, and leucovorin; and the severe Pneumocystis pneumonia presentation with trimethoprim-sulfamethoxazole and corticosteroids.
Each vignette describes a classic presentation of a major HIV-associated opportunistic infection that requires a specific first-line antimicrobial regimen. CMV retinitis is treated with valganciclovir. Cryptococcal meningitis induction requires amphotericin B and flucytosine. Toxoplasmosis is treated with sulfadiazine, pyrimethamine, and leucovorin. Severe PCP requires trimethoprim-sulfamethoxazole combined with corticosteroids to mitigate fatal inflammatory lung injury.

Step-by-Step Solution

1
Analyze the first clinical vignette regarding the retinal findings.
Identified Cytomegalovirus (CMV) retinitis based on the description of exudates and hemorrhages.
Recognizing the specific pathogen allows for matching with its targeted antiviral therapy, valganciclovir.
2
Examine the second clinical vignette focusing on the cerebrospinal fluid (CSF) analysis.
Identified Cryptococcal meningitis based on encapsulated yeast cells visualized via India ink stain.
Determines the need for aggressive induction antifungal therapy with amphotericin B and flucytosine rather than monotherapy.
3
Evaluate the third clinical vignette involving neuroimaging findings.
Identified Toxoplasma encephalitis based on multiple ring-enhancing lesions in the basal ganglia.
Guides the selection of targeted anti-parasitic therapy with sulfadiazine and pyrimethamine.
4
Assess the fourth clinical vignette noting the respiratory symptoms and blood gas results.
Identified severe Pneumocystis jirovecii pneumonia (PCP) due to the characteristic infiltrates and a PaO2PaO_2 of 6565 mm Hg.
A PaO2<70PaO_2 < 70 mm Hg is a strict indication to add systemic corticosteroids to the primary antimicrobial therapy (trimethoprim-sulfamethoxazole) to reduce mortality.

Key Concept

Diagnosis and initial targeted pharmacotherapy for major opportunistic infections in patients with advanced HIV/AIDS.
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Topics

Infectious Diseases

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