Chronic Suppressive Antibiotics for Total Knee Arthroplasty
Pathogen-Specific Suppressive Regimens
- The Infectious Diseases Society of America recommends cephalexin 500 mg orally three to four times daily for methicillin-susceptible staphylococci 1, 2
- The Infectious Diseases Society of America recommends co-trimoxazole one double-strength tablet orally twice daily for methicillin-resistant staphylococci 1, 2
- For β-hemolytic streptococci, penicillin V 500 mg orally two to four times daily is the preferred agent 1, 2
- For Enterococcus species (penicillin-susceptible), penicillin V 500 mg orally two to four times daily or amoxicillin 500 mg orally three times daily is recommended 1, 2
- For Pseudomonas aeruginosa, ciprofloxacin 250-500 mg orally twice daily is recommended 1, 2
- For Enterobacteriaceae, co-trimoxazole one double-strength tablet orally twice daily or β-lactam oral therapy based on susceptibilities is recommended 1, 2
- For Propionibacterium species, penicillin V 500 mg orally two to four times daily, or alternatives including cephalexin, amoxicillin, or minocycline/doxycycline are recommended 1, 2
Clinical Decision Algorithm for Chronic Suppression
- Chronic suppressive therapy should be considered in patients unsuitable for or refusing further exchange revision, excision arthroplasty, or amputation 3, 4
- Chronic suppressive therapy should be considered in elderly or immunosuppressed patients 3
- Chronic suppressive therapy should be considered in patients with staphylococcal PJI in whom rifampin was not utilized 3
- Indefinite chronic suppression is recommended following the initial treatment course 1, 4, 5
Critical Monitoring Requirements
- Antimicrobial dosage must be adjusted based on renal and hepatic function 1, 2
- Clinical and laboratory monitoring for efficacy and toxicity is advisable 1, 4, 5
- Monitor for Clostridium difficile colitis with any antimicrobial 1, 2
- When using fluoroquinolones, discuss and monitor for prolonged QTc interval and tendinopathy 1, 2
Common Pitfalls and Critical Caveats
- Rifampin alone is not recommended for chronic suppression due to rapid resistance development 1, 4, 5
- Rifampin combination therapy is not generally recommended for chronic suppression 1, 4, 5
- Linezolid should not be used for indefinite chronic suppression 3
- All antimicrobials must be chosen based on in vitro susceptibility testing 1, 3, 4
- Consider patient drug allergies, intolerances, and potential drug interactions 1, 3, 4