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Risk factors and treatment outcomes in osteomyelitis
Alan D Tice1, Pamela A Hoaglund, David A Shoultz
1Infections Limited, P.S., Tacoma, WA, USA. alantice@idlinks.com
Abstract:
Outcome indicators of recurrence and amputation were used to evaluate risk factors and treatment choices in 454 patients with osteomyelitis who completed outpatient parenteral antimicrobial therapy (OPAT). Three hundred and fifteen (69.4%) were apparently cured at the time outcomes were measured and 139 (30.6%) had a recurrence. Of the recurrences, 56% occurred within 3 months, 78% within 6 months and 95% within 1 year. Both the initial pathogen and the choice of antibiotic had an effect on the risk of treatment failure. Osteomyelitis caused by Pseudomonas aeruginosa was associated with more than a two-fold increase in recurrence (P = 0.005) compared with infection caused by Staphylococcus aureus. There was a positive correlation between P. aeruginosa and amputation. With S. aureus infections, the risk of recurrence was more than twice as great with vancomycin therapy as opposed to treatment with beta-lactams (P = 0.03). Treatment with ceftriaxone was as effective as the penicillinase-resistant penicillins and cefazolin.
Insights
Outpatient parenteral antimicrobial therapy (OPAT) for osteomyelitis showed recurrence rates influenced by the pathogen and antibiotic choice. Pseudomonas aeruginosa increased recurrence risk, while vancomycin was less effective for Staphylococcus aureus infections.
Area of Science:
- Infectious Diseases
- Orthopedic Surgery
- Pharmacology
Background:
- Osteomyelitis is a serious bone infection requiring effective treatment.
- Outpatient parenteral antimicrobial therapy (OPAT) is a common treatment modality.
- Understanding risk factors for recurrence and amputation is crucial for optimizing OPAT outcomes.
Purpose of the Study:
- To evaluate risk factors and treatment choices impacting recurrence and amputation in osteomyelitis patients undergoing OPAT.
- To compare the efficacy of different antibiotic regimens for specific pathogens.
Main Methods:
- Retrospective analysis of 454 osteomyelitis patients completing OPAT.
- Outcome indicators included recurrence and amputation rates.
- Statistical analysis to identify risk factors (pathogen, antibiotic choice) for treatment failure.
Main Results:
- Overall recurrence rate was 30.6%, with most occurring within one year.
- Osteomyelitis caused by Pseudomonas aeruginosa showed a >2-fold increase in recurrence compared to Staphylococcus aureus (P=0.005).
- Vancomycin therapy for S. aureus infections was associated with >2-fold increased recurrence risk versus beta-lactams (P=0.03).
- Ceftriaxone demonstrated comparable efficacy to penicillinase-resistant penicillins and cefazolin.
Conclusions:
- Pathogen type and antibiotic selection significantly influence osteomyelitis treatment outcomes in OPAT.
- Pseudomonas aeruginosa infections and vancomycin for S. aureus infections require careful consideration due to higher recurrence risks.
- Specific antibiotic choices, like ceftriaxone, can be effective alternatives.