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Difficulty: MediumInfectious Diseases

Match each clinical presentation of an immunocompromised patient with the most appropriate targeted pharmacotherapy.

  • A 32-year-old patient with untreated HIV presents with new-onset seizures; brain MRI reveals multiple ring-enhancing lesions in the basal ganglia.Oral pyrimethamine, sulfadiazine, and leucovorin
  • A 45-year-old patient with untreated HIV presents with subacute headache, fever, and a positive serum cryptococcal antigen test.Intravenous liposomal amphotericin B and flucytosine
  • A 28-year-old patient with untreated HIV presents with floaters, blurred vision, and yellow-white retinal lesions with associated hemorrhage on funduscopy.Oral valganciclovir
  • A 39-year-old patient with untreated HIV presents with progressive dyspnea, nonproductive cough, and severe resting hypoxemia (PaO2 60 mmHg); chest imaging shows bilateral ground-glass opacities.Intravenous trimethoprim-sulfamethoxazole and adjunctive corticosteroids

Answer

The correct pairings match Toxoplasmosis with pyrimethamine/sulfadiazine/leucovorin, Cryptococcal meningitis with amphotericin B/flucytosine, CMV retinitis with valganciclovir, and severe Pneumocystis pneumonia with TMP-SMX/corticosteroids.
Each targeted pharmacotherapy directly addresses the specific pathogen responsible for the classic opportunistic infection presentations in patients with advanced HIV, adhering to standard induction and primary treatment guidelines.

Step-by-Step Solution

1
Evaluate the clinical and radiographic presentation in each patient to identify the most likely opportunistic infection.
The pathogens are identified as Toxoplasma gondii, Cryptococcus neoformans, Cytomegalovirus (CMV), and Pneumocystis jirovecii.
Accurate diagnosis of the specific opportunistic infection is required before selecting targeted antimicrobial therapy.
2
Select the appropriate primary treatment regimen for each identified pathogen based on current clinical guidelines.
Toxoplasmosis requires pyrimethamine-based therapy; Cryptococcus requires amphotericin-based induction; CMV requires a -ganciclovir derivative; PCP requires TMP-SMX.
Different classes of pathogens (protozoan, fungal, viral) require highly specific antimicrobial mechanisms of action.
3
Assess disease severity for the PCP case to determine if adjunctive therapy is needed.
The patient's PaO2 is 60 mmHg (less than 70 mmHg), indicating severe disease that requires adjunctive corticosteroids.
Steroids prevent the severe inflammatory response that occurs when dying Pneumocystis organisms release inflammatory antigens in the lungs.

Key Concept

Pharmacotherapy for HIV-associated opportunistic infections
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Topics

Infectious Diseases

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