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SKIN AND SOFT TISSUE INFECTIONSOCTOBER 3-4, 2015
Steven Tran, PharmD
NEFSHP Fall Meeting 2015
Disclosures
• I have no financial conflicts of interest to disclose or report.
Objectives for Pharmacists
Review the signs and symptoms of skin and soft tissue infections
Recommend evidence-based antibiotic regimens for the treatment of skin and soft tissue infections
Evaluate ongoing treatment regimens for appropriate continuation of therapy
Skin and Soft Tissue Infections (SSTI)
Impetigo/Ecthyma
Furuncles/Carbuncles/Abscesses
Cellulitis/Erysipelas
Wound Infections
Necrotizing Infections
Animal Bite Wounds
SSTI with Neutropenic Fever
Stevens DL, et al. Clin Infect Dis. 2014 June.
Skin and Soft Tissue Infections (SSTI)
Impetigo/Ecthyma
Furuncles/Carbuncles/Abscesses
Cellulitis/Erysipelas
Wound Infections
Necrotizing Infections
Animal Bite Wounds
SSTI with Neutropenic Fever
Stevens DL, et al. Clin Infect Dis. 2014 June.
Scratching the Surface
Food and Drug Administration. Guidance for Industry. 2013 Oct.
Furuncles/Carbuncles/Abscesses Collection of pus within dermis or deeper
with redness, edema and/or induration
Cellulitis/Erysipelas Diffuse skin infection with spreading area
of redness, edema, and/or induration
Wound Infection Purulent drainage from wound with
surrounding redness, edema and/induration
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Scratching the Surface
Food and Drug Administration. Guidance for Industry. 2013 Oct.
Furuncles/Carbuncles/Abscesses Collection of pus within dermis or deeper
with redness, edema and/or induration
Cellulitis/Erysipelas Diffuse skin infection with spreading area
of redness, edema, and/or induration
Wound Infection Purulent drainage from wound with
surrounding redness, edema and/induration
Skin and Soft Tissue Infections: A Focus
• Common reason for medical attention
• Outpatient setting
• Physician offices
• Hospital outpatient departments
• Emergency room visits
• Inpatient setting
• Hospital admissions
• Surgical site complications
Suaya JA, et al. BMC Infectious Diseases. 2014 Jun.Dryden MS. Int J Antimicrob Agents. 2009 Jul.
0
0.5
1
1.5
2
2.5
3
3.5
4
ED Inpatient
Mil
lio
ns
1990s 2000s
The Bugs of Interest
• Nonpurulent SSTI - Cellulitis• Beta-hemolytic streptococci
• Purulent SSTI - Abscess• Staphylococcus aureus, methicillin-sensitive and resistant
• Hospital-acquired SSTI or Site/Wound Infection• S. aureus, p. aeruginosa, e. coli, enterococcus spp.
• SSTI with Recent Water Contact• Aeromonas hydrophila, Vibrio vulnificus
• Necrotizing fasciitis• S. pyogenes, S. aureus, enterobactericeae, klebsiella spp.,
pseudomonas spp., anaerobes
Rajan, S. Cleveland Clinic Journal of Medicine. 2012 Jan.Stevens DL, et al. Clin Infect Dis. 2014 June.
SENTRY: Complicated SSTIs
44.6
11.1 9.3 7.2 4.8 4.2 4.1
05
101520253035404550
% o
f Is
ola
tes
Rajan, S. Cleveland Clinic Journal of Medicine. 2012 Jan.
Bacteria on the Loose
• Methicillin-resistant S. aureus (MRSA)• Presence first detected in 1961
• Methicillin introduced 2 years earlier
• Major nosocomial pathogen • Hospital-acquired MRSA (HA-MRSA)
• Frequent isolate from positive cultures
• Blood stream and site infections
• Increasing community prevalence• Community-acquired MRSA (CA-MRSA)
• Respiratory and skin and soft tissue infections
Dryden MS. Int J Antimicrob Agents. 2009 Jul.Christensen KL, et. Clin Infect Dis. 2009 Oct.
Infectious Disease Society of America (IDSA) Guidelines
• 2014 Guidelines for SSTI
• Update and refine 2005 guidelines
• Organization and weighting of recommendations
• Recognize the emergent issue of MRSA for SSTIs
• Provide systematic management to providers for different classifications of SSTI
• Evidence-based treatment options
• Simple diagnostic algorithms for appropriate therapy
Stevens DL, et al. Clin Infect Dis. 2014 June.
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Stevens DL, et al. Clin Infect Dis. 2014 June. Stevens DL, et al. Clin Infect Dis. 2014 June.
Nonpurulent SSTIs
Stevens DL, et al. Clin Infect Dis. 2014 June.
Nonpurulent SSTIs Pallin et al. (2013) Uncomplicated Cellulitis
Background Multicenter from 2007 to 2011
Design Randomized, double-blind, placebo controlled trial
Participants Inclusion
• Emergency room
• Uncomplicated cellulitis
Intervention Cephalexin + placebo versus
Cephalexin + trimethoprim/sulfamethoxazole
Outcome Primary: Risk difference for cure at 1 month• Follow-up at 2 weeks and 1 month
Pallin et al. Clin Infect Dis. 2013 June.
Exclusion• Symptoms > 1
week
• Diabetes• Abscess > 3 mm
• Purulence > 1 cc
Pallin et al. (2013) Uncomplicated Cellulitis
Statistics • Intention-to-treat
Results • 153 (146) patients
• Control: previous antibiotic use, crowded contact, spider bite
• Intervention: healthcare worker, MRSA contact, cellulitis with edema
• Clinical cure
• Control: 60/73 (82%)
• Intervention: 62/73 (85%)
• 2.7% (95% CI, -9.3% to 15%)
• Subsequent per-protocol analysis
• 4 non-cellulitis patients
• 4.2 (95% CI, -7.4 to 16%)
Pallin et al. Clin Infect Dis. 2013 June.
Pallin et al. (2013) Uncomplicated Cellulitis
Discussion • No benefit from trimethoprim-sulfamethoxazole
• IDSA guidelines
• Non-purulent cellulitis
• Microbiological data?
• CA-MRSA exotoxin?
• Diabetics excluded
• CA-MRSA risk factors
• Epidemiological correlations
• Duration of therapy
• Effectiveness versus efficacy
Implications • First evidence-based trial for IDSA guideline
• 2 ongoing trials
Pallin et al. Clin Infect Dis. 2013 June.Stevens DL, et al. Clin Infect Dis. 2005 Nov.
Ruhe et al. Clin Infect Dis 2007 June.Genestier, et al. J Clint Invest. 2005 May.
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Stevens DL, et al. Clin Infect Dis. 2014 June.
Nonpurulent SSTIs
Stevens DL, et al. Clin Infect Dis. 2014 June.
Nonpurulent SSTIs
Stevens DL, et al. Clin Infect Dis. 2014 June.
Nonpurulent SSTIs
Stevens DL, et al. Clin Infect Dis. 2014 June.
Purulent SSTIs
Schmitz et al. (2010) Uncomplicated Abscess
Background Role of CA-MRSA coverage after incision and drainage (I/D) of uncomplicated skin abscesses
Design Multi-center, double-blind, randomized placebo controlled trial
Participants • Inclusion• ED patients >16yo
• Abscess with I/D
Intervention Trimethoprim-sulfamethoxazole 160/800 mg BID for 7 days post-I/D versus placebo
Outcome Primary: Treatment failure within 7 days
Secondary: Development of new lesions, abscess, or pustule within 30 days
Schmitz GR et al. Ann Emerg Med. 2010 Sep.
• Exclusion• Immunocompromised
• Fever/systemic signs
• Previous antibiotics
• Deeper structure abscess
Schmitz et al. (2010) Uncomplicated Abscess
Results • 220 patients enrolled
• 96 TMP-SMX, 116 placebo
• Culture results
• Primary outcome
Placebo TMP-SMX
MRSA 47/100 (47%) 50/84 (60%)
MSSA 22/100 (22%) 13/84 (15%)
S. viridans 5/100 (5%) 2/84 (2%)
Coag neg staph 10/100 (10%) 1/84 (1%)
Placebo (n=102)
TMP-SMX(n=88)
P value
Treatment failureat 7 days
27 (26%)
15 (17%)
0.12
Schmitz GR et al. Ann Emerg Med. 2010 Sep.
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Schmitz et al. (2010) Uncomplicated Abscess
Results • 139 patients at 30-day follow-up
Discussion • Similar rates of CA-MRSA
• Loss to follow-up for secondary outcome
• Previous trials
• Cephalexin post-I/D
• TMP-SMX in pediatrics
• Addition of TMP-SMX to I/D does not decrease failure rate
Placebo (n=50)
TMP-SMX(n=46)
P value
New lesion within 30 days
14 (28%)
4 (9%)
0.02
Schmitz GR et al. Ann Emerg Med. 2010 Sep. Stevens DL, et al. Clin Infect Dis. 2014 June.
Cefazolin versus Oxacillin/Nafcillin
Stevens DL, et al. Clin Infect Dis. 2014 June.
Cefazolin versus Oxacillin/Nafcillin
Stevens DL, et al. Clin Infect Dis. 2014 June.
Cefazolin versus Oxacillin
• Li et al. (2014)
• Complicated MSSA bacteremia• Tolerability
• Outcomes• Primary: rate of clinical cure at end of therapy
• Secondary: treatment failure, adverse events, discontinuation
• Results• 59 patients treated with cefazolin
• 93% received 6 grams daily
• 34 patients treated with oxacillin• 94% received 12 grams daily
• Clinical cure: 95% (C) versus 88% (O) (p = 0.25)Li J, et al. Antimicrob. Agents Chemother. 2014 June.
Cefazolin versus Oxacillin
24%
3% 3%
47%
30%
21%
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
Treatment Failure ADEs Discontinuation
Cefazolin
Oxacillin
Li J, et al. Antimicrob. Agents Chemother. 2014 June.
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Cefazolin versus Nafcillin
Youngster I, et al. Clin Infect Dis. 2014 April.
Cefazolin versus Nafcillin
6.7%4.2% 3.3%
1.6%
33.8%
13.9%11.4%
8.1%
0.0%
5.0%
10.0%
15.0%
20.0%
25.0%
30.0%
35.0%
40.0%
PAD Rash Renalimpairment
Liverabnormalities
Cefazolin
Nafcillin
Youngster I, et al. Clin Infect Dis. 2014 April.
Cefazolin versus Nafcillin
6.7%4.2% 3.3%
1.6%
33.8%
13.9%11.4%
8.1%
0.0%
5.0%
10.0%
15.0%
20.0%
25.0%
30.0%
35.0%
40.0%
PAD Rash Renalimpairment
Liverabnormalities
Cefazolin
Nafcillin
Youngster I, et al. Clin Infect Dis. 2014 April.
Daily Cost
Cefazolin: $25
Nafcillin: $170
What About MRSA?
Stevens DL, et al. Clin Infect Dis. 2014 June.
What About MRSA?
Stevens DL, et al. Clin Infect Dis. 2014 June.
Linezolid vs Vancomycin vs Daptomcyin
• Retrospective cohort review• Acute SSTI for less than 2 weeks
• Linezolid, vancomycin, or daptomycin > 48 hours
• Outcome: hospital length of stay (LOS)
• Results:• 219 total patients
• Daptomycin: n = 84
• Linezolid: n = 45
• Vancomycin: n = 90
• Prolonged LOS: n = 30
Szczypniska E, et al. SpringerPlus. 2013 Dec.
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Szczypniska E, et al. SpringerPlus. 2013 Dec.
Linezolid vs Vancomycin vs Daptomcyin
Szczypniska E, et al. SpringerPlus. 2013 Dec.
Linezolid vs Vancomycin vs Daptomcyin
• No difference in length of stay for empiric treatment• Vancomycin: 87% of troughs > 10 mg/mL
Linezolid vs Vancomycin vs Daptomcyin
Szczypniska E, et al. SpringerPlus. 2013 Dec.
MRSA Agent Daily Cost
Daptomycin (4 mg/kg) $340
Linezolid $222
Vancomycin (1g q12h) $7
Antibiotics and Healthcare
“Every antibiotic prescribed has a potential health system impact caused by creation of selective pressures for multi-drug resistant organisms.”
–Stan Deresinski, MD
CDC. Antibiotic Resistance Threat in the United States. 2013 April. Kanj SS et al. Mayo Clin Proc. 2011 Mar.
Resistance Timeline Narrow Spectrum of Approval
• Quantity of Antibiotic Use• Continuation of empiric
coverage with multiple agents
• New agents for MRSA and multi-drug resistant organisms
versus
• Quality of Antibiotic Use• Effective use of current
antibiotics
• Reserving newer therapies for resistant organisms
Spellberg N, et al. Clin Infect Dis.2008 Jan.Owens RC et al. Pharmacotherapy. May 2004.Arnold FW et al. J Manag Care Pharm. June 2004
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Food and Drug Administration (FDA) Guidance
• 2013: FDA and Industry• Guidance for Industry: Developing Drugs for Treatment
• Acute bacterial skin and skin structure infections (ABSSSI)• Resolution of signs and symptoms after completion of
therapy• Reliability of outcome measure?
• Previous research• Treatment effects at 48-72 hours
• Applicable to modern circumstances and standards?
Food and Drug Administration. Guidance for Industry. 2013 Oct.
Foundation for National Institutes of Health (FNIH): A Helping Hand
• Historical data suggests…• Antibacterial versus ultraviolet light
• Cessation of lesion spread for cellulitis: day 2
• Clinical cure at 7 days• Potential treatment response earlier in therapy?
• Effectiveness of modern agents vs. sulfonamides
Food and Drug Administration. Guidance for Industry. 2013 Oct.Snodgrass WR, Anderson T. BMJ. 1937 July.
Snodgrass WR, Anderson T. BMJ. 1937 Dec. Corwin P et al. BMJ. 2005 Dec.
• Interim Evaluation
• Analysis of modern trials for lesion size and control
• Tigecycline, daptomycin, ceftaroline
• Response 48-72 hours after randomization
• Success defined as control of infected lesion spread
• Concerns
• Lack of rigorous justification for biomarker
• Lesion spread as related to functional status
• Future direction
• Evaluate content validity and measurement properties of endpoints
• Third phase of review: new trials based on interim recommendations
Foundation for National Institutes of Health (FNIH): A Helping Hand
Talbot GH, et al. Clin Infect Dis. 2012 Oct.
FNIH and FDA: Development of Endpoints
• Bridge Recommendations• Cellulitis/erysipelas, major cutaneous abscesses,
wound infections• >75 cm2 lesion size
• <30% trial population: abscess
• Clinical Trials• Non-inferiority design
• Primary outcome: lesion response at 48-72 hours
• Secondary outcome: resolution of ABSSSI 7-14 days after therapy
Food and Drug Administration. Guidance for Industry. 2013 Oct.Talbot GH et al. Clin Infect Dis. 2012 Oct.
Tedizolid Dalbavancin Oritavancin
Approval June 2014 May 2014 August 2014
Indication
ABSSSI• MSSA/MRSA• Strep. spp.• E. faecalis
ABSSSI• MSSA/MRSA• Strep. spp.
ABSSSI• MSSA/MRSA• Strep. spp.• E. faecalis
Dose200 mg IV or PO
daily x 6 days1000 mg IV x 1, then
500 mg IV 1 week later1200 mg IV infusion
x1
Adverse Effects
Nausea, vomiting, diarrhea
Nausea, rash, Red-Man Syndrome
Nausea, vomiting, SSTI abscess
formation
Half-life 12 hours 204 hours 393 hours
Arsenal of New Antimicrobials
Prokocimer P et al. JAMA. 2013 Feb. Moran GJ et al. Lancet Infect Dis. 2014 Aug.Boucher HW. N Engl J Med. 2014 Jun. Corey GR et al. Clin Infect Dis. 2014 Oct.
ESTABLISH-1 ESTABLISH-2Group • >18 yo
• ABSSSI with local or systemic signs of infection
• >12 yo
• ABSSSI with local or systemic signs of infection
Intervention • 200 mg PO tedizolid daily x 6 days
• 600 mg PO linezolid BID x 10 days
• 200 mg IV tedizolid x daily 6 days
• 600 mg IV linezolid x BID 10 days
Outcome • Early response
• Sustained response
• Clinical success
• Early response
• Sustained response
• Clinical success
Results • 667 patients
Early response
• 0.1% [-6.1-6.2%]
Sustained response
• 69.3% vs 71.9%
Clinical success
• 85.5% vs 86.0%
• 666 patients
Early response
• 2.6% [-3.0-8.2%]
Sustained response
• 87% vs 88%
Clinical success
• 92% vs 96%
Prokocimer P et al. JAMA. 2013 Feb. Moran GJ et al. Lancet Infect Dis. 2014 Aug.
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DISCOVER-1/2 SOLO-1/2Group • ABSSSI with 1 systemic and 2
local signs• IV tx for at least 3 days
• ABSSSI with 1 systemic and 2 local signs
• IV tx for at least 7 days
Intervention • Dalbavancin 1 g IV on day 1, then 500 mg IV on day 8
• Vancomycin 1g or 15 mg/kg IV q12h x 3-14 days
• Oritavancin 1200 mg IV x 1 over 3 hours
• Vancomycin 1g or 15 mg/kg IV q12h x 7-10 days
Outcome • Early response
• Lesion reduction
• PTE clinical response
• Early response
• Lesion reduction
• PTE clinical response
Results • 659 DALBA, 653 VANCOEarly response• 79.7% vs 79.8%Lesion reduction• 88.6% vs 88.1%PTE clinical response• 96.0% vs 96.7%
• 978 ORITA, 981 VANCOEarly response• 81.2% vs 80.9%Lesion reduction• 86.4% vs 84.1%PTE clinical response• 81.2% vs 80.2%
Corey R, et al. Pennsylvania Convention Center. 2014 Oct. Boucher HW. N Engl J Med. 2014 Jun. Corey GR et al. Clin Infect Dis. 2014 Oct.
Corey GR et al. N Engl J Med. 2014 Jun.
DISCOVER-1/2 SOLO-1/2Group • ABSSSI with 1 systemic and 2
local signs• IV tx for at least 3 days
• ABSSSI with 1 systemic and 2 local signs
• IV tx for at least 7 days
Intervention • Dalbavancin 1 g IV on day 1, then 500 mg IV on day 8
• Vancomycin 1g or 15 mg/kg IV q12h x 3-14 days
• Oritavancin 1200 mg IV x 1 over 3 hours
• Vancomycin 1g or 15 mg/kg IV q12h x 7-10 days
Outcome • Early response
• Lesion reduction
• PTE clinical response
• Early response
• Lesion reduction
• PTE clinical response
Results • 659 DALBA, 653 VANCOEarly response• 79.7% vs 79.8%Lesion reduction• 88.6% vs 88.1%PTE clinical response• 96.0% vs 96.7%
• 978 ORITA, 981 VANCOEarly response• 81.2% vs 80.9%Lesion reduction• 86.4% vs 84.1%PTE clinical response• 81.2% vs 80.2%
Corey R, et al. Pennsylvania Convention Center. 2014 Oct. Boucher HW. N Engl J Med. 2014 Jun. Corey GR et al. Clin Infect Dis. 2014 Oct.
Corey GR et al. N Engl J Med. 2014 Jun.
Roles of New Agents
• Tedizolid• Shortened duration of therapy
• Less side effects
• Dalbavancin• Convenient dosing
• Long half-life
• Oritavancin• Convenient dosing
• Long half-life
• But how do they compare?
Prokocimer P et al. JAMA. 2013 Feb. Moran GJ et al. Lancet Infect Dis. 2014 Aug.Boucher HW. N Engl J Med. 2014 Jun. Corey GR et al. Clin Infect Dis. 2014 Oct.
Thom H et al. (2015)
ABSSSI: Systemic Review and Meta-Analysis
Background Previous meta-analyses did not include newer agents and excluded the presence of indirect evidence for treatments
Design and Criteria
Systematic literature review and network meta-analysis
• Adult patients with ABSSSI treated with:
• Vancomycin
• Linezolid
• Daptomycin
• Tigecycline
• Clindamycin
• Study data and outcomes must have conformed to new FDA guidelines on ABSSSI
• Exclusions: medical conditions affecting interpretation of early clinical response (ECR) e.g. neutropenia
• Intention to treat (ITT) and clinically evaluable (CE) patients
Thom H et al. Curr Med Res Opin. 2015 Aug.
• Telavancin
• Dalbavancin
• Oritavancin
• Tedizolid
Thom H et al. (2015)
ABSSSI: Systemic Review and Meta-Analysis
Outcome Focus
• Clinical response
• Test-of-cure (TOC)
• Early clinical response (ECR)
Results • 52 trials identified
• 26 trials included for TOC outcome
• 10 trials included enough data for ECR comparison
• Clindamycin/telavancin excluded due to lack of relationship data
Thom H et al. Curr Med Res Opin. 2015 Aug.
Thom H et al. (2015)
ABSSSI: Systemic Review and Meta-Analysis
Treatment TOC ITT* TOC CE*
Ceftaroline 1.07 (0.77-1.51) 2.29 (0.21-2.48)
Dalbavancin 1.01 (0.24-4.41) 1.16 (0.47-2.35)
Daptomycin 2.18 (0.90-5.42) N/A
Linezolid 1.55 (0.91-2.57) 1.65 (0.68-3.53)
Oritavancin 1.06 (0.80-1.43) 1.24 (0.41-2.26)
Tedizolid 1.51 (0.82-2.73) N/A
Tigecycline 0.87 (0.61-1.26) 0.90 (0.31-1.79)
Thom H et al. Curr Med Res Opin. 2015 Aug.
*Treatment effects are presented as odds ratio versus vancomycin. Ratios >1 indicate superior outcome for the comparator.
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Thom H et al. (2015)
ABSSSI: Systemic Review and Meta-Analysis
Discussion • No statistically significant difference among approved agents for ABSSSI for TOC
• Limited ECR data suggests same results
• Previous two meta-analyses suggests superiority of linezolid over vancomycin
• No inclusion of indirect effects of treatment comparators
Limitations • Unable to assess MRSA or MSSA confirmed subgroups due to lack of data
• Several studies lacked information to assess ECR
Conclusion • Suggestion of equivalence for current use of agents for ABSSSI
• More ABSSSI studies are needed that confirm to recent FDA guidelines
Thom H et al. Curr Med Res Opin. 2015 Aug. Stevens DL, et al. Clin Infect Dis. 2014 June.
Narrowing Coverage to Suspected Pathogens
Stevens DL, et al. Clin Infect Dis. 2014 June.
De-escalation to Defined Therapy
Stevens DL, et al. Clin Infect Dis. 2014 June.
Antimicrobial Stewardship
Right Drug
Right Dose
Right Duration
Appropriate De-escalation
Right Route of Delivery
Dellit TH, et al. Clin Infect Dis. 2007 Jan.
Antimicrobial Stewardship Program• Principles of Stewardship
• Appropriate selection, dosing, route, and duration of antimicrobial therapy
• Optimize clinical outcomes
• Minimize unintended consequences of antimicrobial use:
Drug toxicity
Selection of pathogenic organisms
Emergence of resistance
• Ensure quality assurance and patient safety
Dellit TH, et al. Clin Infect Dis. 2007 Jan.
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Pasquale TR, et al. Am J Health Syst Pharm. 2014 Jul.
Pasquale et al. (2014) Antimicrobial Stewardship - ABSSSI
Background • Summa Health System
• Historical data from 2011
• ABSSSI average LOS: 6.2 days
• 30-day ABSSSI readmission rate: 6.2%
Design • Retrospective observational chart review
Participants • Emergency department admits with ABSSSI
• Reviewed within 24 hours
• Cellulitis, abscess, surgical site/wound infections
Intervention • Evaluation of patient by clinical pharmacist and ID physician
• Prospective chart review and recommendation
Outcome • Length of stay and 30-day ABSSSI readmission rate
Pasquale et al. (2014) Antimicrobial Stewardship - ABSSSI
Results • 62 patients• 22 (35%) diabetics
• 85 Interventions; 81 accepted
Dose change 27 (44%)
De-escalation 23 (37%)
Regimen change 20 (24%)
ID consult 6 (7%)
Other 9 (11%)
Cellulitis 47 (76%)
Major or deep abscess 16 (26%)
Surgical site infection 5 (8%)
Diabetic Wound 2 (3%)
Pasquale TR, et al. Am J Health Syst Pharm. 2014 Jul.
Pasquale et al. (2014) Antimicrobial Stewardship - ABSSSI
Results
Discussion • Specific for ABSSSI • Observational study
• Small patient size
Implications • Interventions are readily available in various forms
• Antimicrobial stewardship implementation and focus
ASP Group(n=62)
Historical Group
(n=1149)
P-value
Length of stay (days) 4.4 6.2 <0.001
30-day all-cause readmission rate 6.5% 16.71% 0.050
30-day ABSSSI readmission rate 3.33% 6.27% 0.483
Pasquale TR, et al. Am J Health Syst Pharm. 2014 Jul. Stevens DL, et al. Clin Infect Dis. 2014 June.
Intravenous to Oral AntibioticsCoverage IV Therapy PO Therapy
Streptococcus/ MSSA
• Cefazolin
• Oxacillin/ Naficillin
• Ceftriaxone
• Amoxicillin-clavulanate
• Cephalexin
• Clindamycin
MRSA • Vancomycin
• Linezolid
• Ceftaroline
• Daptomycin
• Doxycycline
• Minocycline
• TMP-SMX
• Clindamycin
Polymicrobial • Piperacillin/ tazobactam + vancomycin
• TMP-SMX + cephalexin or clindamycin
Stevens DL, et al. Clin Infect Dis. 2014 June.
Future Directions
• Duration of Antibiotic Therapy for Cellulitis (DANCE)• Prospective, multicenter, non-inferiority trial in the
Netherlands
• Short versus standard duration of inpatient cellulitis therapy• Primary outcome: resolution of cellulitis at day 14 without
recurrence at day 28
• Flucloxacillin IV/PO for 10-14 days for all cellulitis cases
• Potential guidance for duration of therapy• Similar studies for respiratory tract infections, urinary tract
infections, and bacteremia
Cranendonk DR, et al. BMC Infect Dis. 2014 May.
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Future Directions• Omadacycline
• Oral/IV, once-daily tetracycline derivative• Gram (+), gram (-), atypical, anaerobic, MRSA
• ABSSSI, CABP, UTI undergoing phase 3 trials
• Iclaprim• IV dihydrofolate reductase inhibitor initially denied approval in 2008• Phase 3 trials approved on April 2015
• ABSSSI and HABP caused by gram (+) pathogens
• Other investigational antibiotics• BC-3781 – semisynthetic pleuromutilin derivative• CEM-102/Fusidic acid – oral agent with high dose regimen• JNJ-Q2/Avarofloxacin – targets topoisomerase II and IV• TD-1792/1607 – glycopetptide-cephalosporin heterodimers
Conclusion
Skin and soft tissue infections are common
High antibiotic exposure for patients
Appropriate empiric treatment with antibiotics, if indicated
Identification of most common pathogens for SSTI classification
Nonpurulent – Streptococcus spp., MSSA
Purulent – MSSA/MRSA
Bug-drug match
Consider local antibiogram
Conclusion
Antimicrobial stewardship is essential
Appropriate drug
Appropriate dose
Appropriate de-escalation of therapy
Refer to culture/susceptibility if present
Appropriate IV to PO conversion
Review resolution of leukocytosis, fever, PO intake
Appropriate duration of therapy
7-14 days inpatient, but reassess daily
Acknowledgements
• Florian Daragjati, PharmD, BCPS
• Michele Loudy, PharmD, BCPS
• Kevin Epps, PharmD, BCPS (AQ-ID), BCNSP
SKIN AND SOFT TISSUE INFECTIONSOCTOBER 3-4, 2015
Steven Tran, PharmD
NEFSHP Fall Meeting 2015