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Difficulty: MediumInfectious Diseases

Match the following clinical presentations in patients with advanced HIV/AIDS to their most appropriate definitive pharmacotherapy.

  • CD4 cell count of 40/mm340/\text{mm}^3, presenting with painless, progressive loss of vision. Fundoscopy reveals perivascular hemorrhages and fluffy white exudates.Intravitreal ganciclovir and systemic valganciclovir
  • CD4 cell count of 180/mm3180/\text{mm}^3, presenting with a dry cough, dyspnea on exertion, bilateral ground-glass opacities on chest CT, and a PaO2\text{PaO}_2 of 62 mmHg62 \text{ mmHg} on room air.Intravenous trimethoprim-sulfamethoxazole and systemic corticosteroids
  • CD4 cell count of 85/mm385/\text{mm}^3, presenting with headache, confusion, new-onset seizures, and multiple ring-enhancing lesions on brain MRI.Oral sulfadiazine, pyrimethamine, and leucovorin
  • CD4 cell count of 35/mm335/\text{mm}^3, presenting with fever, night sweats, marked weight loss, and elevated alkaline phosphatase. Blood cultures grow acid-fast bacilli.Oral clarithromycin and ethambutol

Answer

The correct pairings accurately match advanced HIV opportunistic infections with their definitive first-line therapies based on the clinical presentation, objective findings, and CD4 count thresholds.
Each clinical scenario describes a classic opportunistic infection associated with specific CD4 count thresholds in advanced HIV/AIDS, requiring a highly specific targeted antimicrobial regimen as per standard clinical guidelines.

Step-by-Step Solution

1
Identify the opportunistic infection described in the first scenario (CD4 <50/mm3< 50/\text{mm}^3, perivascular hemorrhages).
The diagnosis is CMV retinitis.
This is determined by matching the classic fundoscopic findings of 'pizza pie' retinopathy with profound immunosuppression.
2
Determine the appropriate therapy for severe PCP (PaO2<70 mmHg\text{PaO}_2 < 70 \text{ mmHg}) in the second scenario.
Trimethoprim-sulfamethoxazole must be given with adjunctive corticosteroids.
Steroids are required in severe cases to mitigate the inflammatory response triggered by dying organisms within the alveoli.
3
Identify the cause of ring-enhancing brain lesions with seizures in advanced HIV.
Toxoplasma encephalitis, treated with sulfadiazine, pyrimethamine, and leucovorin.
This is the most common cause of focal brain lesions in HIV patients with CD4 <100/mm3< 100/\text{mm}^3 not receiving adequate prophylaxis.
4
Recognize disseminated MAC infection from the combination of profound immunosuppression, systemic B symptoms, and positive blood cultures for acid-fast bacilli.
Treatment with clarithromycin and ethambutol.
A multi-drug regimen is required for MAC to ensure clinical clearance and prevent the emergence of antimicrobial resistance.

Key Concept

Identifying and treating major opportunistic infections in advanced HIV/AIDS based on CD4 thresholds and characteristic clinical syndromes.
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Topics

Infectious Diseases

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