Fluid resuscitation
Surgical consult
IR consult if requiring abscess drainage
Metronidazole 500mg IV q8hrs
Plus one of the following:
Ceftriaxone 1g IV once daily
Ciprofloxacin 400mg IV q12hrs
Cefazolin 1g (30mg/kg) IV q8hrs
Levofloxacin 750mg IV once daily
Ceftriaxone 1g IV once daily
Ciprofloxacin 400mg IV q12hrs
Cefazolin 1g (30mg/kg) IV q8hrs
Levofloxacin 750mg IV once daily
Metronidazole 500mg IV q8h
+ Vancomycin 15mg/kg/dose IV q12h (Max dose = 1500mg)
Plus one of the following:
Piperacillin/tazobactam 4.5g IV q6h
Ertapenem 1g IV q24h
Ceftriaxone 1g IV q24h
Piperacillin/tazobactam 4.5g IV q6h
Ertapenem 1g IV q24h
Ceftriaxone 1g IV q24h
One of the following:
Piperacillin-tazobactam
Ticarcillin-clavulanate 3.1 g IV every 6 hours
Ertapenem 1 g every 24 hours
Moxifloxacin 400 mg IV every 24 hours
Piperacillin-tazobactam
Ticarcillin-clavulanate 3.1 g IV every 6 hours
Ertapenem 1 g every 24 hours
Moxifloxacin 400 mg IV every 24 hours
Piperacillin/Tazobactam 4.5g (80mg/kg) IV q8hrs OR
Metronidazole 500mg IV q8hrs PLUS
Cefepime 2g IV once daily OR
Ciprofloxacin 400mg IV q12hrs OR
Levofloxacin 750mg IV once daily
Meropenem 1g (20mg/kg) IV q8hrs OR
Doripenem 500mg IV q8hrs OR
Aztreonam 2g (30mg/kg) IV q8hrs + Metronidazole 500mg IV q8hrs
Cefepime 2g IV once daily OR
Ciprofloxacin 400mg IV q12hrs OR
Levofloxacin 750mg IV once daily
aztreonam 2g IV q8h
+ metronidazole 500mg IV q8h
+/- vancomycin 15mg/kg/dose IV q12h (Max dose = 1500mg)
Peritonitis
Abdominal aortic aneurysm
Spontaneous bacterial peritonitis
Aortocaval fistula
Appendicitis 
Acute gastroenteritis
Appendicitis
Aortoenteric fisulta