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ID > Skin, soft tissue, bone, joint infxns > Flashcards

Skin, soft tissue, bone, joint infxns Flashcards

1
Q

infxn at the jxn of the cutaneous and subcutaneous

A

erysipelas

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2
Q

infxn at the subcutaneous fat

A

cellulitis

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3
Q

infxn at the level of the arteries and veins

A

necrotizing fasciitis

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4
Q

common agents of impetigo

A

strep pyogenes, staph aureus

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5
Q

common agents of erysipelas

A

strep pyogenes

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6
Q

common agents of folliculitis, furuncles

A

Staph aureus

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7
Q

common agents of cellulitis

A

strep pyogenes, staph aureus

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8
Q

slightly tender, pruritic, papular rash, caused by pseudomonas

A

hot tub folliculitis

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9
Q

hot tub folliculitis caused by

A

pseudomonas aeruginosa

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10
Q

initially tender 1 cm erythematous nodule, now larger with dark center, spider bite 4 months prior

A

furuncle (skin abscess)

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11
Q

tx of furuncle (2)

A
  1. I & D

2. antimicrobials if cellulitis

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12
Q

tx of non-purulent cellulitis (2 topsions)

A
  1. 1st gen cephalosporin (cefazolin, cephalxin)

2. anti-stphylococcal PDN (nafcillin, dicloxacillin)

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13
Q

tx of purulent SSTI - MRSA possible (4 options)

A
  1. vancomycin
  2. TMP-SMX
  3. clindamycin
  4. minocycline
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14
Q

tx of hot tub folliculitis

A

NO antimicrobials

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15
Q

organisms that can cause necrotizing fasciitis (4)

A
  1. clostridium perfringens
  2. GAS
  3. polymicrobial (gr- rods + gram+cocci)
  4. MRSA
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16
Q

patient presents with severe constant pain, systemic toxicity, gas in soft tissues

A

necrotizing fasciitis

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17
Q

most common source of clostridium fasciitis

A

tissue trauma

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18
Q

Fungal infxn in a patient who gardens, presents with chancriform/nodular lesions

A

sporotrichosis

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19
Q

what sort of lesion does bacillis anthracis present with?

A

presents with chancriform/nodular lesions

20
Q

causative agent of tularemia

A

francisella tularenis

21
Q

other organisms that can cause chronic nodular lesions

A

nocardia
leishmania
blastomycosis dermatitis

22
Q

woman presents w/ h/o RA on prednisne, with acute onset of pain & swelling in knee; incr warmth, decr ROM, WBC 80K

A

septic arthritis

23
Q

risk factors for septic arthritis (3)

A
  1. RA
  2. steroids
  3. DM
24
Q

most common etiology of septic arthritis

A

staph aureus

25
Q

common etiology of septic arthritis if prosthetic joint

A

coagulase negative staph (S. epidermis or S saprophyticus)

26
Q

other than staph, what else can cause septic arthritis?

A

streptococci grp A & B

27
Q

typical white count of synovial fluid in septic arthritis

A

purulent, >60K (>75%)

28
Q

young female, sexually active, febrile, wrist w/ swelling, erythema, pain on motion, painless skin lesions on extremities

A

disseminated gonococcal infxn

29
Q

disseminated gonococcal infxn presents with what syndromes (2)

A
  1. gonococcal arthritis

2. tenosynovitis, dermatitis, polyarthralgia w/o purulent joint infxn

30
Q

tx of N. gonorrhea in septic arthritis?

A
  1. 3rd gen cephalosporin OR

2. fluroquinolone

31
Q

tx of S. aureus in septic arthritis?

A
  1. Nafcillin
  2. 1st gen ceph OR
  3. vancomycin
32
Q

tx of GAS in septic arthritis?

A
  1. PCN

2. ceph

33
Q

tx of gram neg in septic arthritis?

A
  1. ceph
  2. fluoroquinolone
  3. carbapenems
34
Q

how long to tx gonococcal arthritis

A

2 weeks

35
Q

how long to tx S. aureus or gram neg arthritis

A

4 weeks

36
Q

in a diabetic, what type of osteomyelitis should you be thinking?

A

contiguous osteomyelitis

37
Q

S/S of acute osteomyelitis are ____month, vs chronic is ____

A

under 1 month; >1 mont

38
Q

acute osteomyelitis most commonly occurs under what circumstances?

A

IVDU, bacteremia

39
Q

chronic osteomyelitis most commonly occurs under what circumstances?

A

trauma, surgery, contigous foci

40
Q

what is the most common causative agent of osteomyelitis?

A

staph aureus

41
Q

preferred modality for imaging osteomyelitis?

A

MRI

42
Q

in puncture wound osteomyelitis with sinus tracking, suspect what sort of microb?

A

pseudomonas aeruginosa

43
Q

probe to the bone test in patients with osteomyelitis & h/o DM: positive predictive value ___, negative predictive value____

A

89%; 56%

44
Q

how to tx osteomyelitis in DM patients?

A

empiric Abx

45
Q

how to tx acute osteomyelitis

A
  1. anti-staphylococcal Abx

2. gr - tx if suggested by hx

46
Q

how to tx chronic osteomyelitis

A

broad spectrum pending cultures, then pathogen directed tx

47
Q

use of debridement in acute vs chronic osteomyelitis

A

acute - occasionally need

chronic - always need

ID (17 decks)

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