Opportunistic Mycoses (Lecture) Flashcards Preview

Multisystem Midterm > Opportunistic Mycoses (Lecture) > Flashcards

Flashcards in Opportunistic Mycoses (Lecture) Deck (13):
1

HIV positive patient presents with 3 months of nonproductive cough, progressive DOE, and substernal tightness. A chest x-ray reveals diffuse interstitial infiltrates. He does not improve despite receiving a round of azithromycin and ceftriaxone. His sputum is silver stain positive. What is the most likely causative agent, diagnosis and treatment? What would be the treatment if he were unconscious (unable to take anything PO)?

Pneumocystis jiroveci is the most likely cause and is and AID defining illness. His CD count is likely below 200
Trimethoprim / sulfamethoxazole is appropriate if PO tolerant, if not pentamidine IV

2

Patient who was recently started on regimen for PCP returns to your office with worse pneumonia symptoms and is concerned. He would like to change his medication because he does not think it is working. CXR does not show any change is the disease course. What should be your course of action?

Continue current treatment. It is common for the patient to get worse before getting better.

3

What marker is used to determine prophylactic treatment of PCP and what is the DoC?

CD 4 less than 200
Trimethorpim / sulfa

4

Patient with a history of HIV and CD 4 counts greater than 400 who has not been seen in years shows up with extreme headaches and reports having a cat at home. CT shows multiple ring enhancing lesions in her brain. What is the likely causative agent and diagnosis?

Toxoplasmosis
AIDS, this pt. likely has a CD 4 count below 100

5

What is the first line tx for toxo?

Pyrimethamine / sulfadiazine

6

What is first line prophylaxis of toxo?

Trimethoprim / sulfa

7

Patient with a history of poorly controlled HIV reports seeing flashes of lights in her peripheral vision. On optho exam, you see yellow-white granular areas, perivascular exudates and hemorrhages. What is the likely causative organism, diagnosis, and first line oral treatment?

CMV
AIDS with CD 4 less than 50
Valganciclovir is most commonly used oral agent

8

24 y.o. prostitute who was recently treated for a yeast infection presents with a white plaque on her tongue and in her esophagus. You are able to scrape a sample off, but cause a small amount of bleeding in doing so. Microscopy reveals yeast, pseudohyphae and germ tubes. What is the most likely causative agent and diagnosis?

Candida produces hyphae, pseudohyphae, yeast and germ tubes
Trush in the esophagus is an AID defining illness

9

What are the two most commonly used medications for candida?

Azoles (esp fluconazole)
Amphotericin B

10

Patient with a history of poorly controlled HIV presents with meningitis. He has a bird at home. Microscopy with India ink of the fluid gathered during an LP reveals broad budding yeast that have large capsules. What is the most likely causative agent and treatment?

Crytpococcus
Treat severe infection with amphotercin B
Mild disease is treated with fluconazole

11

What is the most common opportunistic infection in AIDS?

PCP

12

Patient with a history of AIDS presents with sub acute pneumonia and neutropenia. Culture shows parallel contours and acute angle branching. What is the causative organism?

Aspergillus

13

What is the growth pattern of Mucormycosis?

Non-septate with obtuse branching hyphae