Match the following clinical presentations of patients with advanced HIV infection to the … — USMLE Step 2 CK

Match the following clinical presentations of patients with advanced HIV infection to the most appropriate initial targeted antimicrobial therapy.

An immunocompromised patient (CD4 count = $35 \text{ cells/mm}^3$ ) complains of seeing 'floating spots' and progressive blurring of vision. Retinal examination demonstrates dense, yellowish-white areas of necrosis accompanied by perivascular hemorrhages.Valganciclovir
Following a week of worsening headaches and lethargy, a patient with poorly controlled HIV (CD4 count = $80 \text{ cells/mm}^3$ ) undergoes a lumbar puncture. The cerebrospinal fluid has a significantly elevated opening pressure and tests positive for a capsular polysaccharide antigen.Liposomal amphotericin B and flucytosine
A patient with advanced HIV (CD4 count = $150 \text{ cells/mm}^3$ ) describes a three-week history of worsening shortness of breath on exertion and a nonproductive cough. High-resolution chest computed tomography reveals diffuse, bilateral ground-glass opacities.Trimethoprim-sulfamethoxazole
Emergency medical services bring in a patient with known HIV (CD4 count = $40 \text{ cells/mm}^3$ ) after witnessing a generalized tonic-clonic seizure. Subsequent magnetic resonance imaging of the brain highlights several ring-enhancing lesions located within the basal ganglia.Sulfadiazine, pyrimethamine, and leucovorin

Cevap

The correct matches are: 1) CMV retinitis matched to Valganciclovir, 2) Cryptococcal meningoencephalitis matched to Liposomal amphotericin B and flucytosine, 3) Pneumocystis jirovecii pneumonia matched to Trimethoprim-sulfamethoxazole, and 4) Toxoplasma encephalitis matched to Sulfadiazine, pyrimethamine, and leucovorin.

Each clinical vignette describes classic pathognomonic findings for specific HIV-related opportunistic infections. CMV retinitis presents with retinal hemorrhages and exudates and is treated with valganciclovir. Cryptococcal meningitis presents with elevated intracranial pressure and positive capsular antigen, requiring induction therapy with liposomal amphotericin B and flucytosine. PJP presents with bilateral ground-glass opacities and is treated with high-dose TMP-SMX. Toxoplasma encephalitis presents with ring-enhancing lesions and seizures, necessitating treatment with sulfadiazine, pyrimethamine, and leucovorin (to prevent pyrimethamine-induced hematologic toxicity).

Adım Adım Çözüm

Identify the underlying opportunistic infection based on the clinical vignette findings and the patient's CD4 cell count threshold.

Diagnoses identified are CMV retinitis, Cryptococcal meningoencephalitis, Pneumocystis jirovecii pneumonia (PJP), and Toxoplasma gondii encephalitis.

Accurate pathogen identification is required to select the precise targeted antimicrobial therapy.

Select the appropriate first-line antimicrobial regimen for each definitively identified pathogen.

Matched each opportunistic infection to its respective gold-standard pharmacotherapy.

Using the correct targeted therapy maximizes clinical efficacy and adheres to established infectious disease guidelines.

Anahtar Kavram

Diagnosis and first-line targeted therapy of major opportunistic infections in patients with advanced HIV based on CD4 count thresholds and classic clinical presentations.

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