Antimicrobial Treatment Guidelines for Common Infections June 2016 Published by: The NB Provincial Health Authorities Anti-infective Stewardship Committee under the direction of the Drugs and Therapeutics Committee Introduction: These clinical guidelines have been developed or endorsed by the NB Provincial Health Authorities Anti-infective Stewardship Committee and its Working Group, a sub- committee of the New Brunswick Drugs and Therapeutics Committee. Local antibiotic resistance patterns and input from local infectious disease specialists, medical microbiologists, pharmacists and other physician specialists were considered in their development. These guidelines provide general recommendations for appropriate antibiotic use in specific infectious diseases and are not a substitute for clinical judgment. Website Links For Horizon Physicians and Staff: http://skyline/patientcare/antimicrobial For Vitalité Physicians and Staff: http://boulevard/FR/patientcare/antimicrobial To contact us: [email protected] When prescribing antimicrobials: Carefully consider if an antimicrobial is truly warranted in the given clinical situation Consult local antibiograms when selecting empiric therapy Include a documented indication, appropriate dose, route and the planned duration of therapy in all antimicrobial drug orders Obtain microbiological cultures before the administration of antibiotics (when possible) Reassess therapy after 24-72 hours to determine if antibiotic therapy is still warranted or effective for the given organism or clinical situation. Reassess based on relevant clinical data, microbiologic and/or radiographic information Assess for de-escalation as appropriate based on available microbiology culture and susceptibility results 2 Antimicrobial Treatment Guidelines For Common Infections (Click arrow buttons to navigate) Section 1: Anatomical Page Foot Diabetic Foot Infections 4 Gastrointestinal Clostridium difficile Infection 5 Intra-Abdominal Infections 6 Respiratory Acute Bacterial Rhinosinusitis 8 Acute Exacerbation of Chronic Obstructive Pulmonary Disease 9 Community Acquired Pneumonia 10 Skin and Soft Tissue Cellulitis/Erysipelas 11 Genitourinary Urinary Tract Infections 12 Section 2: Drug Use Guidelines Adult Dosing Table 13 Penicillin and β-Lactam Allergy 25 Antimicrobial Allergy Evaluation Tool 35 IV-to-PO Conversion Criteria 41 Nevirapine for Perinatal HIV Transmission Prophylaxis 42 Section 3: Other Splenectomy Vaccination Kit 43 References 51 3 EMPIRIC ANTIMICROBIAL THERAPY FOR DIABETIC FOOT INFECTION (Endorsed by NB Health Authorities Anti-Infective Stewardship Committee February 2016) 1 1 Infection Severity Preferred Empiric Regimens Alternative Regimens Comments Mild Wound less than 4 weeks duration Wound less than 4 weeks duration • Outpatient management • Cellulitis less than 2 cm • cephalexin 500 mg PO four times daily* • clindamycin 300 – 450 mg PO four times daily (only if recommended and without involvement of Wound greater than 4 weeks duration severe β-lactam allergy) • Tailor regimen based on C&S deeper tissues • sulfamethoxazole/trimethoprim 800/160 mg PO twice daily* + Wound greater than 4 weeks duration results & patient response • Non-limb threatening metroNIDAZOLE 500 mg PO twice daily • amoxicillin/clavulanate 875/125mg PO twice daily* OR • No signs of systemic toxicity • doxycycline 100 mg PO twice daily + metroNIDAZOLE 500 mg PO twice daily Moderate Wound less than 4 weeks duration Wound less than 4 weeks duration • Initial management with • Cellulitis greater than 2 • ceFAZolin 2 g IV q8h* OR • levofloxacin 750mg IV/PO once daily* (only if severe outpatient parenteral therapy cm or involvement of deeper • cefTRIAXone 2 g IV once daily (to facilitate outpatient management when β-lactam allergy) with rapid step-down to oral tissues ambulatory administration of ceFAZolin not possible) Wound greater than 4 weeks duration therapy after 48 to 72 hours • Non-limb threatening based on patient response Wound greater than 4 weeks duration • levofloxacin 750mg IV/PO once daily* + recommended • No signs of systemic toxicity • ceFAZolin 2 g IV q8h* + metroNIDAZOLE 500 mg PO twice daily OR metroNIDAZOLE 500 mg PO twice daily (only if severe β-lactam allergy) • Tailor regimen based on C&S • cefTRIAXone 2 g IV once daily + metroNIDAZOLE 500 mg PO twice daily results & patient response (to facilitate outpatient management when ambulatory administration of ceFAZolin not possible) Severe • piperacillin-tazobactam 3.375 g IV q6h* • imipenem/cilastatin 500 mg IV q6h* OR • Inpatient management • Systemic signs of sepsis • levofloxacin 750 mg IV once daily* + metroNIDAZOLE recommended • Limb or foot threatening 500 mg PO/IV twice daily (only if severe β-lactam • Urgent vascular assessment if • Extensive soft tissue allergy) pulseless foot involvement • Tailor regimen based on C&S • Pulseless foot results & patient response Clinical Pearls: Duration of Therapy 1 If high risk for MRSA, should include sulfamethoxazole/ • Soft tissue only – 2 weeks trimethoprim 800/160 mg PO twice daily * or doxycycline 100 • Bone involvement with complete surgical resection of all infected bone – 2 weeks mg PO twice daily for mild infections and vancomycin weight- • Bone involvement with incomplete surgical debridement of infected bone – 4-6 weeks IV based dosing to a target trough of 15 – 20 mg/L for moderate- severe infections • Bone involvement with no surgical debridement or residual dead bone postoperatively – 6 weeks IV, followed by 6 weeks PO • Debridement, good glycemic control and proper wound care are References: important for the management of diabetic foot infections 1. Bowering K, Embil JM. Canadian Diabetes Association 2013 Clinical Practice Guidelines for the Prevention and Management of Diabetes in • Cultures: prefer tissue specimens post-debridement and Canada: Foot Care. Can J Diabetes 37(2013) S145-S149 cleansing of wound; surface or wound drainage swabs not 2. Lipsky BA, Berendt AR, Cornia PB et al. 2012 Infectious Disease Society of America Clinical Practice Guidelines for the Diagnosis and Treatment recommended of Diabetic Foot Infections. CID 2012:54(12):132-173 • In a clinically infected wound a positive probe-to-bone (PTB) 3. Lipsky BA, Armstrong DG, Citron DM et al. Ertapenem versus piperacillin/tazobactam for diabetic foot infections (SIDESTEP): prospective, test is highly suggestive of osteomyelitis randomized, controlled, double-blinded, multicentre trial. Lancet 2005; 366:1695 – 1703 • Imaging: recommend plain radiography (radionuclide imaging 4. Blond-Hill E, Fryters S. Bugs & Drugs An Antimicrobial/Infectious Diseases Reference. 2012. Alberta Health Services unnecessary) * Dose adjustment required in renal impairment 9782-10650-04-2016 4 Antimicrobial Management of Clostridium difficile Infection (CDI) (NB Provincial Health Authorities Anti-Infective Stewardship Committee, May 2014) Diarrhea: 3 or more unformed or watery stools in 24 hrs or less Send stool for Clostridium difficile testing Colonoscopic/ Results pending but high Positive results histopathologic findings of clinical suspicion pseudomembranous colitis 1. Discontinue therapy with the inciting antimicrobial agent if possible 2. Stop all anti-peristaltic & pro-motility agents unless clearly indicated1 3. Begin Infection Control Precautions - Accommodate patient in a private room (if possible) - Gowns and gloves (masks unnecessary) - Perform hand hygiene (preferably soap and water) 4. Classify & treat according to severity of CDI Severe Severe, Complicated Mild or Moderate Criteria: Criteria: Criteria WBC greater than 15x109/L OR Hypotension or shock OR WBC 15x109/L or less OR Serum creatinine level 1.5 x baseline Ileus OR Serum creatinine level less than level or greater OR 1.5 x baseline level Megacolon Clinical judgement (e.g. ICU Admission) Any Episode vancomycin 125 mg2 PO/NG four times daily Initial Episode Any Episode +/- metroNIDAZOLE 500 mg IV three times daily metroNIDAZOLE 500 mg PO vancomycin 125 mg PO (Add vancomycin 500 mg in 100mL NS three times daily x 10 - 14 days four times daily x 10 - 14 days retention enema four times daily if ileus) Duration: Generally 10 - 14 days but may extend depending on clinical scenario. Recurrent Clostridium difficile Infection First Recurrence: Treat same as for initial episode and according to CDI severity Second Recurrence: Vancomycin taper regimen: 125 mg PO four times daily x 14 days, then 125 mg PO twice daily x 7 days, then 125 mg PO once daily x 7 days, then 125 mg PO every 2 days x 2 weeks then discontinue Third Recurrence: Consider ID consult Clinical Pearls - Pregnancy/breast feeding: use vancomycin PO (avoid metroNIDAZOLE) - Symptoms of CDI usually begin 2 - 3 days after colonization - Test for cure is not recommended - Vancomycin administered intravenously is ineffective for CDI - Fidaxomicin is a non-formulary item that should only be considered under extenuating clinical circumstances, ID consultation required 1Examples: loperamide, diphenoxylate, opioids, metoclopramide, domperidone, etc 2For complicated severe episodes some authorities recommend vancomycin doses up to 500 mg; appropriate dose has not been established in clinical trials Adapted from: Vancouver Coastal Health Antimicrobial Stewardship Treatment Guidelines for Common Infections March 2011 1st Edition 5 Antimicrobial Therapy for Intra-Abdominal Infections (NB Provincial Health Authorities Anti-Infective Stewardship Committee, November 2015) Origin/Severity of Intra- Probable Preferred Empiric