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Guidelines
Pathogens
Antimicrobials
≥ 4 weeks usually required
IV therapy usually required
ID consult highly recommended
If source control achieved (e.g. pancreatic debridement), 14 days post-op may be adequate
Meropenem 1g IV Q8H
Therapy Pearls
Therapy ideally should be based on culture results
Empiric therapy can be initiated before guided aspiration or if aspiration cannot be obtained
Discontinue antibiotics if necrosis is found to be sterile
Strong evidence also exists for Moxifloxacin
Consider adding antifungals if candida risk factors present (see Candida in IAI below)
Enteral nutrition vs. TPN has been shown to decrease infectious complications
ESBLs in IAI
Candida in IAI
Moxifloxacin 400mg IV/NG Q24H
OR
Ciprofloxacin 400mg IV or 500mg NG Q12H
AND
Metronidazole 500mg IV/NG Q12H
Usual Organisms
Enterobacteriaceae (E. coli, Klebsiella)
Enterococci
Less Common Organisms
Candida
Pseudomonas aeruginosa
AmpC producing organisms or "SPICE" bacteria