Infections in Immunocompromised & HIV Emergencies
Comprehensive emergency protocol for opportunistic infections in immunocompromised and HIV-positive patients. Covers Pneumocystis jirovecii pneumonia (PJP) steroid indications based on PaO2 and A-a gradient, distinguishing toxoplasmosis from CNS lymphoma, cryptococcal meningitis opening pressure management, and Immune Reconstitution Inflammatory Syndrome (IRIS).
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Bottom-Line Clinical Pearl
In Pneumocystis jirovecii pneumonia (PJP), administer systemic corticosteroids (Prednisone 40 mg PO BID) BEFORE or with the first dose of TMP-SMX if the room air PaO2 is < 70 mmHg or the alveolar-arterial (A-a) gradient is >= 35 mmHg, preventing life-threatening inflammatory respiratory deterioration.
| CD4 Count | Pathogen & Opportunistic Illness | Clinical Hallmarks | Emergency Diagnostic & Treatment Protocol |
|---|---|---|---|
| CD4 < 200 cells/mcL | Pneumocystis jirovecii Pneumonia (PJP / PCP) | Subacute exertional dyspnea, nonproductive cough, exertional hypoxemic desaturation, elevated LDH, bat-wing bilateral interstitial infiltrates | TMP-SMX (15-20 mg/kg/day TMP IV) + Adjunctive Corticosteroids if PaO2 < 70 mmHg or A-a gradient >= 35 mmHg. |
| CD4 < 100 cells/mcL | Cerebral Toxoplasmosis (Toxoplasma gondii) | Headache, focal neurologic deficits, seizures, fever; CT/MRI shows MULTIPLE ring-enhancing lesions in basal ganglia with vasogenic edema | Empiric Pyrimethamine + Sulfadiazine + Leucovorin (or high-dose TMP-SMX). Repeat imaging in 10-14 days; if non-responsive, biopsy for Primary CNS Lymphoma. |
| CD4 < 100 cells/mcL | Cryptococcal Meningitis (Cryptococcus neoformans) | Insidious headache, fever, lethargy; meningismus frequently ABSENT. Opening pressure markedly elevated (> 20-30 cmH2O) | Induction: Liposomal Amphotericin B + Flucytosine. Mandatory daily therapeutic lumbar punctures to remove CSF until opening pressure < 20 cmH2O. |
| CD4 < 50 cells/mcL | Cytomegalovirus (CMV) Retinitis & Colitis | Painless visual floaters, blurring, field loss ('pizza-pie' retinal hemorrhages with granular exudates); severe bloody diarrhea | Stat Ophthalmology consult; IV Ganciclovir (5 mg/kg IV q12h) or Valganciclovir PO; high risk of retinal detachment. |
| CD4 < 50 cells/mcL | Mycobacterium avium Complex (MAC) | Fever, drenching night sweats, profound weight loss, diarrhea, hepatosplenomegaly, severe anemia | Clarithromycin 500 mg PO BID + Ethambutol 15 mg/kg PO daily; blood mycobacterial cultures. |
The A-a gradient evaluates alveolar-capillary gas exchange on room air:
- A-a Gradient Formula: A-a = [FiO2 * (Patm - PH2O) - (PaCO2 / 0.8)] - PaO2. On room air at sea level: A-a = [150 - (PaCO2 / 0.8)] - PaO2.
- High-Risk Threshold: Room air PaO2 < 70 mmHg OR A-a Gradient >= 35 mmHg.
- Steroid Dosing Regimen: Prednisone 40 mg PO BID on Days 1-5, followed by 40 mg daily on Days 6-10, and 20 mg daily on Days 11-21 (or IV Methylprednisolone at 75% of oral dose). Administering steroids prevents paradoxical inflammatory ARDS from antibiotic-induced parasite lysis.
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