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Derm > Wk 5 MS Infectious Diseases > Flashcards

Wk 5 MS Infectious Diseases Flashcards

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Dermatology Board Prep flashcards
1
Q

Most common causative organism in necrotizing fasciitis

A

group A beta-hemolytic Strep

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2
Q

Organism that causes gas gangrene

A

C. perfringens

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3
Q

S. pyogenes:

Gram +/-
Cocci/Bacilli
Catalase +/-
α/β hemolytic
Bacitracin sensitive/insensitive
A 
Gram +
Cocci
Catalase - (uses peroxidase)
β-hemolytic
Bacitracin sensitive
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4
Q

C. perfringens:

Gram +/-
Cocci/Bacilli
Spore forming/not
Obligate anaerobe/opportunistic aerobe
Motile/nonmotile
A 
Gram +
Bacilli
Spore forming
Obligate anaerobe
Nonmotile
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5
Q

What causes SIRS (systemic inflammatory response syndrome)?

A

Strep exotoxins produced at site of infection (not bacteremia)

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6
Q

Tx of necrotizing fasciitis

A

surgical debridement and IV Abx

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7
Q

Septic infectious arthritis causative organisms

A

S. aureus and N. gonorhoeae

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8
Q

S. aureus

Gram +/-
Cocci/Diplococci
Catalase +/-
Coagulase +/-

A

Gram +
Cocci
Catalase +
Coagulase +

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9
Q

N. gonorrhoeae

Gram +/-
Cocci/Diplococci
Oxidase +/-
Only Glucose Oxidizer?

A

Gram -
Diplococci
Oxidase +
Glucose only oxidizer

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10
Q

How is acute septic arthritis usually diagnosed?

A

synovial fluid specimen (normal: clear)

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11
Q

Acute septic arthritis: sudden onset or progressive?

A

sudden onset

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12
Q

Salmonella typhii

Gram +/-
Cocci/bacilli
Lactose fermentor/lactose nonfermentor
Oxidase +/-
Produces H2S/No H2S production
Motile/non-motile
A 
Gram -
bacilli
lactose non-fermentor
oxidase -
produces H2S
motile
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13
Q

Pasteurella multocida

Gram +/-
Cocci/bacilli
Oxidase +/-
Catalase +/-

A

Gram -
Coccobacilli (pleomorphic)
Oxidase +
Catalase +

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14
Q

Diagnostic imaging for Dx of osteomylitis

A

bone scan

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15
Q

What does CT/MRI show in osteomylitis

A

possibly edema

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16
Q

Proximal joint findings in osteomylitis

A

benign

17
Q

What are the 3 causative organisms for osteomyelitis

A

S. aureus
S. typhii (sickle cell patients)
P. multocida (cat bites)

18
Q

Salmonella as cause for osteomyelitis: pt population

A

sickle cell patients

19
Q

Osteomyelitis: neutrophil banding?

A

some banding

20
Q

Necrotizing fasciitis neutrophil pattern

A

lots of banding

21
Q

Terrible 3 of salmonella and ostomyelitis

A

poor circulation + expanded marrow + increased oxygen

22
Q

WBC normal

A

4,500-11,000 / mL

23
Q

ESR normal

A

≤ 20 mm/hr

24
Q

CRP

A

≤ 1 mg/dL

Derm (45 decks)

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