Presentation is loading. Please wait.

Presentation is loading. Please wait.

MANAGEMENT OF SKIN AND SOFT TISSUE INFECTIONS

Similar presentations


Presentation on theme: "MANAGEMENT OF SKIN AND SOFT TISSUE INFECTIONS"— Presentation transcript:

1 MANAGEMENT OF SKIN AND SOFT TISSUE INFECTIONS
Jose A. Vazquez, M.D. Senior Staff Division of Infectious Disease Henry Ford Hospital Professor of Medicine Wayne State University

2 Skin and Soft Tissue Infections General Considerations
Primary vs. Secondary infections Portal of entry Status of host defenses Associated manifestations Toxicity, severity of illness Localization and morphology of lesions Environmental exposure

3 PRIMARY PYODERMAS Impetigo Bullous impetigo
Staphylococcal Scalded Skin Syndrome Folliculitis Furuncles and Carbuncles Erysipelas Cellulitis

4 PRIMARY PYODERMAS Impetigo
>90% due to group A Streptococcus Most occur in children <10% mixture of Staph with Strep Manifestations - small vesicles with erythematous halo - pustulates - ruptures - characteristic golden-yellow thick stuck-on crusts - painless - minimal constitutional symptoms

5

6

7 PRIMARY PYODERMAS Impetigo Therapy
Penicillin still drug of choice Alternatives: - 1st generation cephalosporin (Duricef, Keflex) - If Pen allergic: Erythromycin or Azithromycin Local wound care wet-to-dry dressings Topical antimicrobials far inferior

8 PRIMARY PYODERMAS Bullous Impetigo
Primarily in kids Due to Staphylococcus group II (Type 71) Manifestations: - Begin as vesicles that turn into bullae - Bullae rupture and leave moist red surface - No Nikolsky sign - Finally form a thin “varnish”-like” light brown crust Therapy - Dicloxacillin - 1st generation ceph - Erythromycin or Azithromycin

9 PRIMARY PYODERMAS Erysipelas
A superficial cellulitis of the skin with prominent lymphatic involvement Generally due to group A Strep (rarely group C or G) Most common in: - infants - young kids - older adults - immunocompromised (diabetics, alcoholic, nephrotic syndrome, venous statsis, paraparesis) Portal of entry - skin ulcers, local trauma, abrasions, primary dermatologic conditions, Tineas

10 PRIMARY PYODERMAS Erysipelas - Manifestations
70-80% of lesions are on the lower extremity 5-20% are on the fact A painful lesion with a bright red edematous indurated appearance and an advancing raised border-sharply demarcated Fever Bacteremia ~ 5% Occasional spread to deeper structures Leukocytosis very common

11 PRIMARY PYODERMAS Erysipelas - Manifestations
Penicillin oral vs parenteral Alternatives - 1st generation ceph. - Erythromycin or Azithromycin

12 PRIMARY PYODERMAS Cellulitis
Acute spreading infection of the skin extending into the subcutaneous tissue Etiology: - Staph and Strep most common - Erysipeloid- E. rhusiopathiae - salt water fish, poultry - Anthrax - Bacillus - raw wool - Pseudomonas - spas, heel tennis shoe puncture wounds - Aeromonas - lesions in water - Sporotrichosis - Blastomycosis

13 PRIMARY PYODERMAS Cellulitis
Generally due to: - Previous trauma - Underlying skin condition Skin lesion: borders are not sharply demarcated with erythema, tenderness, warmth, edema Fever - malaise - chills Regional adenopathy Bacteremia ~ 20%

14 PRIMARY PYODERMAS Cellulitis
If strong suspicion of etiologic agent treat with specific antimicrobial. If etiologic agent unknown: - No underlying risk factors 1st generation ceph (cover Staph and Strep) Alternative: if Pen allergic - Erythromycin or Azithromycin (Zithromax)

15 Staphylococcus aureus
Frequent cause of cellulitis, especially in diabetic patients 2nd – 3rd most common cause of BSIs in hospitalized patients. Etiology: > 80 % line infections: Susceptibility has evolved dramatically over the past few year

16

17 What about resistant S. aureus ??

18 Cosgrove SE. et al CID;39:539-45.
Resistance in S. aureus HA-MRSA CA-MRSA VISA or GISA MIC 8-16 to vancomycin VRSA MIC > 32 to vancomycin HR-SA MIC < 4 (susceptible) to vancomycin subpopulations that are VISA Cosgrove SE. et al CID;39:

19 Community-Associated MRSA
Prevalence ~ 36 % Risk Factors: Recent hospitalization Recent antimicrobials Surgery Exposure to MRSA colonized person Athletes (wrestlers, football players) Chronic illness Nursing home, jails, IVDU Eguia JM, Chambers HF. Hosp Epidemiol 5:2003

20 Community-Associated MRSA
Most common infections are SSTI and Resp. tract Many remain susceptible to: clindamycin (89 v 21%); genta (94 v 80%);rifampin (96 v94%); TCN (92%); Bactrim (95v90%) ~ 60 % probably originate from hospitals or long-term care facilities Risk Factors: Recent hospitalization` OR 0-6 months 6-12 months Nursing home Charlebois ED. Et al. CID 2004;39:47-54: Naimi TS. Et al. JAMA;290:

21 Community-Associated MRSA Management
Outpatient Mild Infection Clindamycin 450mg q8 hrs Doxycycline 100mg BID Bactrim DS 2 tabs po BID Moderate to severe Zyvox 600mg BID Inpatient Vancomycin 15mg/kg q12 hrs Zyvox (linezolid) 600mg IV/PO BID Daptomycin (Cubicin) 4mg/kg Charlebois ED. Et al. CID 2004;39:47-54

22 Management of Gram Positives
MSSA Nafcillin 2 gm q4 h Cefazolin (ancef) 2gm q 8 h IV PCN allergy (vanco or linezolid) IV Linezolid oral MRSA Vancomycin Linezolid Daptomycin

23 VRSA – Its All About Sex Michigan Case 1
Gangrenous foot – VRE, MRSA, multiple courses of vanco VRE + MRSA = VRSA ( van A ) PA Case 2 Foot ulcer, VRE in the past. Allergic to Vanco MRSA 1:132 ( van A)

24 Vancomycin-Resistant Staphylococcus aureus
CDC/565/B CDC/565/C June 2002: First case of vancomycin-resistant S aureus (VRSA) isolated from a swab obtained from a catheter exit site. The isolate was resistant to: Oxacillin (MIC>16 μg/mL) Vancomycin (MIC>128 μg/mL) The isolate contained: The oxacillin resistance gene mecA The vanA vancomycin resistance gene from enterococci Reference: Centers for Disease Control and Prevention. Staphylococcus aureus resistant to vancomycin – US, Morb Mortal Weekly Rep. 2002;51; MIC = minimal inhibitory concentration. CDC. MMWR. 2002;51:

25 SECONDARY PYODERMAS Bite wounds
Infections of burns, wounds, or underlying dematitis Diabetic wound infections Decubitus ulcers Surgical wound infections

26 BITE WOUNDS AND INFECTIONS
ANIMAL - Dog - Cat - Snake ~ 8,000/year - few get infected - venom is sterile - Exotic animals - monkey tend to be the most serious - organisms will reflect habitat of animals HUMAN - Occlusional bites - Clenched-fist injuries

27 CAT BITES Epidemiology
~ 400,000/year Primarily in women Infection rates > 50%/bite - Teeth slender, sharp, closer together - High colony counts - Teeth penetrate into bones, capsules, and bones easier

28 CAT BITES MICROBIOLOGY
Pasturella multocida isolated > 50% of bites Otherwise same isolates as dog Rochalimea spp. - R. hensenulae May cause Cat Scratch Disease May produce disseminated disease in immunocompromised host Tx. Erythromycin

29 BITE WOUNDS AND INFECTIONS Dog Bites
~ 80% of all animal bites ~ 15-20% become infected Generally a polymicrobial infection Role of prophylactic antimicrobial therapy ??? - No good prospective studies Probably prudent to provide antimicrobial coverage for at least 3-5 days after the bite

30 DOG BITES Microbiology
Gram positive cocci - alpha hemolytic streptococci ~ 30% - S. aureus ~ 15% - S. intermedium ~ 27% - generally in dogs < 40 lbs. - Beta-hemolytic streptococci - Enterococci - Micrococcus

31 DOG BITES Microbiology
Gram negative rods - Haemophilus - Proteus - E. coli - Enterobacter cloacae

32 DOG BITES Microbiology
Anaerobes Pasturella multocida ~ 10-15% Eikinella corrodens Capnocytophagia carimorsus Actinomyces Bacteroides spp. non Fragilis Fusobacterium Peptostreptococci Peptococci Veillonella Eubacterium Rods

33 HUMAN BITES/CLENCHED FIST INJURIES Epidemiology
Like monkey bites, generally more serious and more prone to develop infection and complications than are animal bites Most tend to occur during fights ~ 20% of injuries are “love nips” and are related to sexual activity

34 HUMAN BITES/CLENCHED-FIST INJURIES
Unfortunately most patients tend to wait until the infection has set in before seeking medical attention Generally results in cellulitis Frequently however, it produces: - deep-space infection - septic arthritis - osteomyelitis ~ 20% of injuries require amputation if no antibiotic is provided

35 HUMAN BITES Microbiology
~ 55% are mixed polymicrobial infections with anaerobes E. corrodens ~ 25% S. aureus Streptococci Hemophilus influenzae

36 BITE WOUND AND INFECTION MANAGEMENT
Tetanus immunization Rabies vaccintion/Rabies immune globulin - if indicated Incision/Drainage/Debridement Gram stain and culture of all material Elevation of injured area - frequent cause of failure Follow-up - preferably within hours

37 BITE WOUNDS AND INFECTIONS Antimicrobial Therapy - Outpatient
Amoxicillin-clavulanate (Augmentin) mg TID oral Doxycycline 100 mg BID oral Tetracycline 500 mg QID oral

38 BITE WOUNDS AND INFECTIONS Antimicrobial Therapy - Inpatient
Ampicillin-sulbactam (Unasyn) 3.0 gm IVPB Q 6 hrs. Cefoxitin or cefotetan 2 gm Q 8-12 hrs. IVPB (No enterococcal coverage) Imipenem/cilastin (Primaxin) mg IVPB QID Piperacillin/tazobactam (Zosyn) 3.75 gm Q 8 hrs.

39

40

41

42 Building a better mouse trap ?

43 Zyvox (Linezolid) 1st oxazolidinone – inhibits protein synthesis
at the initiation of 50S ribosome Spectrum: gram positive pathogens: Staph aureus (MSSA or MRSA) Enterococcus E. fecalis or E. faecium and VRE Streptococcus Group A S. pneumonia including (PCN-Resistant SP) Nocardia spp.

44 Zyvox (Linezolid) Dose : 600mg BID Oral and IV Bioavailability ~ 100%
Metabolism: ~ 65 % non-renal AE: diarrhea ~ 8-10 % thrombocytopenia ~ 2.5%

45 CUBICIN™ (daptomycin) Overview
Lipopeptide natural product Activity in Gram-positive organisms only Bactericidal in vitro and in vivo Safety profile similar to vancomycin Long T1/2 (once-daily IV dosing) No oral formulation FDA approved for SSTI only.

46 Future Antimicrobial Agents For Gram Positives Organisms
Glycopeptides Telavancin Oritavancin Dalbavancin Tetracyclines Tigecycline (broad spectrum activity) Cephalosporins Ceftibiprole (5th generation) Excellent gram positive activity (MRSA & Enterococcus)

47 Conclusions Recent data has shown us: Emerging resistance
CA-MRSA greatest concen ?? MRSA, GISA, VRSA Better understanding of mechanisms of antimicrobial resistance - e.g., selective pressure Better understanding of risk factors predisposing to CA-MRSA infection Future Molecular testing for resistance organisms Newer antimicrobials


Download ppt "MANAGEMENT OF SKIN AND SOFT TISSUE INFECTIONS"

Similar presentations


Ads by Google