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Pulmonary Week 2 > Fungal and Immunocompromised Pneumonia > Flashcards

Fungal and Immunocompromised Pneumonia Flashcards

1
Q

What are the types of fungal infections?

A
  • superficial and cutaneous mycoses
  • subcutaneous (skin, lymphatics, subQ tissue)
  • Endemic mycoses
  • Oppoertunistic mycosis
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2
Q

What causes endemic mycoses?

A

dimorphic fungi

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3
Q

Notes about dimorphic fungi

A
  • most common etiologic agents of pulmonary infection by fungi
  • infection results from inhalation of spores that mold forms in soil
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4
Q

What does ‘dimorphic’ mean?

A

-grow as yeast in human tissue and as mold at room temp

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5
Q

What happens with spores of dimorphic fungi are inhaled?

A

they differentiate into yeasts or spherules. Most are self-limited but all can cause pneumonia and disseminate

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6
Q

What are some dimorphic fungi?

A
  • Blastomyces dermatitidis
  • Histoplasma capsulatum
  • Coccidioides immitis
  • Paracoccidioides brasiliensis
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7
Q

Where is Histoplasma capsulatum endemic?

A

Mississippi and Ohio River

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8
Q

Where does Histoplasma capsulatum grow?

A

soil and bird droppings

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9
Q

How does Histoplasma capsulatum infection present?

A
  • mostly asymptomatic pulmonary infection

- but can have fever, chills, cough, chest pain

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10
Q

In AIDS, Histoplasma capsulatum can disseminate. What organs are typically affected?

A
  • BM (pancytopenia)
  • Mouth/Gi (ulcers)
  • Skin (rash, nodules)
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11
Q

Tissue biopsy of positive Histoplasma capsulatum will show what?

A

oval yeast cells within macrophages

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12
Q

How else can Histoplasma capsulatum be diagnosed?

A
  • serology

- Urinary antigen (good for AIDS patients)

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13
Q

How does Histoplasma capsulatum show on CXR?

A
  • infiltrates
  • mediastinal LAD
  • cavitary lesions
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14
Q

What are two possible skin manifestations of Histoplasma capsulatum infection?

A
  • skin rashes

- erythema nodosum

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15
Q

Note about skin rashes in Histoplasma capsulatum

A

seen in disseminated Histo (rash is rare, but common in AIDS/immunocompromised)

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16
Q

What is erythema nodosum?

A

tender nodules that present on extensor surfaces (tibia and ulna skin). Result from delayed hypersensitivity response to fungal antigen and is an indicatory of poor prognosis (not specific to histo but also seen in coccidioides and TB)

Aka desert bumps

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17
Q

Where is Blastomyces dermatitidis endemic?

A

Ohio/Mississippi River Valley, Missouri, and Arkansas River basins (grows in moist soil)

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18
Q

How does Blastomyces dermatitidis present?

A

asymptomatic respiratory illness, 50% will have cough, chest pain, sputum, fever/night sweats

most resolve spontaneously

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19
Q

Disseminated Blastomyces dermatitidis results in what?

A

ulcerated granulomatous lesions of the skin (70%), bone (33%), GI tract (25%), and CNS (10%). Seen in both immunocompetent and compromised patients

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20
Q

What does tissue biopsy of Blastomyces dermatitidis show?

A

thick-walled yeast cells with single broad-based bud

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21
Q

How is Blastomyces dermatitidis diagnosed?

A
  • CXR (lobar consolidation)
  • tissue biopsy
  • serology
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22
Q

How is Histoplasma capsulate treated?

A

Ampho B for severe and Itra otherwise

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23
Q

How is Blastomyces dermatitidis treated?

A

Ampho B for severe and Itra otherwise

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24
Q

Where is Coccidioides immitis endemic?

A

Southwest and Latin America

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25
Describe the pathogenesis of Coccidioides immitis
In the lungs, large spherules form and filled with endospores. Upon rupture, endospores are released and differentiate into new spherules
26
How does Coccidioides immitis present?
- mild flu-like illness with fever and cough ('valley fever') in 10% - erythema nodosum
27
How common is dissemination in Coccidioides immitis?
1% (to bone, meninges, and skin)
28
What ethnicities are at increased risk for dissemination of Coccidioides immitis?
-AA, Filipinos, and women in 3rd trimester
29
____ is common with Coccidioides immitis
Eosinophilia
30
How is Coccidioides immitis treated?
- Ampho for persistent lung lesions or disseminated | - Fluconazole for meningitis
31
Where is Paracoccidioides brasiliensis endemic?
rural latin america, especially brazil
32
How does Paracoccidioides brasiliensis present?
mild respiratory infection which can disseminate and develop oral, nasal, and facial nodular ulcerated lesions and submandibular LAD
33
How is Paracoccidioides brasiliensis diagnosed?
- tissue biopsy shows yeast cells with multiple buds (aka pilot well configuration) - Serology
34
Treatment of Paracoccidioides brasiliensis?
- several months of Itra | - Ampho for severe
35
Where is Aspergillus fumigatus found and how does it exist?
worldwide in a mold with ACUTE branching septate hyphae that grows on decaying vegetation producing chains of conidia
36
Features of Aspergillus fumigatus infection.
- fungus ball formed within cavities of lungs (can produce hemptysis) - allergic infection of bronchi that produces asthmatic symptoms and high IgE titer - invasive PNA with hemorrhage, infarction, and necrosis
37
What patient population is especially at risk for invasive PNA form of Aspergillus fumigatus?
those with hematologic malignancies and neutropenia
38
How does Aspergillus fumigatus present upon CT?
Can have single or multiple nodules with cavitation and a a ’halo’ sign which are areas of focal hemorrhage around a lesion
39
How is Aspergillus fumigatus treated?
- **Voriconazole** for invasive disease (ampho B and echinocandins alternatives if not well-tolerated) - remove fungus balls
40
What is the treatment for ABPA?
steroids and antifungals
41
Describe Mucormycosis
Opportunistic infections caused by bread mold fungi (Mucor, Rhizomes, Cunninghamella, Lichtheimia)
42
What are some risk factors for Mucormycosis?
- diabetes - neutropenia - Iron excess - burns/surgical wounds - corticosteroid use
43
How is Mucormycosis transmitted?
airbourne spores that invade tissue and blood in those with reduced host defenses
44
How does Mucormycosis present?
- invasive rhinocerebral sinusitis - frontal lobe abscesses - pneumonia - cutaneous infection
45
How does invasive rhinocerebral sinusitis occur?
originates in the paranasal sinuses and spreads to the orbit, hard palate, and brain and carries a high mortality rate
46
How is Mucormycosis diagnosed?
tissue biopsy with nonseptate broad hyphae with frequent RIGHT ANGLE branching; spores in a sporangium
47
How is Mucormycosis treated?
treat underlying disorder + Ampho and surgical removal of necrotic tissue Alternative: Poscaonazole
48
How does Pneumocystis jiroveci exist?
yeast
49
Pneumocystis jiroveci is the most common cause of ___ in immunocompromised patients
pneumonia
50
Pathogenesis of Pneumocystis jiroveci (PCP)
cysts in alveoli produce inflammation, resulting in frothy exudate that block oxygen exchange (organism does not invade lung tissue)
51
How is Pneumocystis jiroveci cleared?
CD4 T cells recruit monocytes and macrophages which clear the organism (thus, AIDS is a major risk factor)
52
How does Pneumocystis jiroveci present?
- Dry cough, progressive dyspnea - fever - tachypnea, hypoxemia
53
CXR of PCP
- pneumothorax | - bilateral infiltrates
54
How is PCP diagnosed?
- Cysts in lung biopsy or from bronchoscopy fluids - fluorescent AB staining - PCR on RT specimens
55
How are cysts identified from PCP?
methenamine silver, Giemsa stain
56
How is PCP treated?
-Cotrimoxazole (Bactrim) (1st line)
57
2nd line options for PCP
- Clindamycin/Primaquine - Atovaquone - Pentamidine
58
Prophylaxis for AIDS patients with CD4 count below 200?
Bactrim, Dapsone, or Atovaquone
59
How does Cryptoococcus neoformans exist?
yeast in soil and PIGEON droppings that has the appearance of oval budding yeast with a wide polysaccharide capsule
60
What disease does Cryptoococcus neoformans cause?
meningitis in immunocompromised (especially in AIDS) AND PNA in immunocompromised AND competent persons
61
How does Cryptoococcus neoformans induced PNA present in immunocompetent persons?
asymptomatic or mild respiratory symptoms
62
How does Cryptoococcus neoformans induced PNA present in immunocompromised persons?
fever, chest pain, dyspnea, cough, and hemoptysis
63
T or F. CMV is a herpes virus
T.
64
How does CMV exist in the body?
enters latent state primarily in monocytes and can be reactivated when cell-meidtaed immunity is decreased
65
What patients is CMV commonly reactivated?
-renal and stem cell transplant recipients | pneumonitis results
66
What does activation of CMV in AIDS patients cause?
colitis and retinitis (typically NOT pneumonitis)
67
Two buzz words with CMV
ground glass appearance and inclusion bodies on H&E
68
What causes Nocardiosis?
Nocardia asteroides
69
Describe Nocardia asteroides
gram+ aerobe found in soil with thin branching filaments
70
In immunocompromised patients, Nocardia asteroides can disseminate and has a predilection for ____
brain tissue (can cause brain abscesses)
71
How is Nocardiosis diagnosed?
gram stain/acid-fast stain; culture
72
Treatment of Nocardiosis
Cotrimoxazole (resistance common- check susceptibilities)

Pulmonary Week 2 (25 decks)

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