236. Insight of Polymicrobial Prosthetic Joint Infections at a Referral Hospital

Abstract Background Approximately one-third of the prosthetic joint infections (PJIs) are polymicrobial. They are difficult to treat and there is an urgent need of clinical evidence that help to guide current protocols. We aimed to define the clinical characteristics and outcomes of patients with polymicrobial PJI. Methods We conducted a retrospective cohort study of patients with polymicrobial PJI treated at a referral hospital in Mexico City. Clinical data was retrieved and analyzed. Time to treatment failure, was evaluated for all cases. Results We identified 166 patients with a polymicrobial PJI from July 2011 to October 2020. The median follow-up period was 3.24 years (IQR, 1.45-6.42). Fistulae (77.7%) and pain (76.5%) were frequent. Patients required a median of 2 (IQR, 1-3) hospitalizations and 3 (IQR, 1-5) surgeries. Relapse, reinfection, and amputation ocurred in 21.1% (35), 10.2% (17), and 7.2% (12) of the cases, respectively. At 1-year follow-up 38.47% (63) patients failed to control the infection. At 2 and 5-year follow-up this rate increased to 50% (83) and 68% (112), respectively. The main infecting microorganisms were Staphylococcus epidermidis (51.8%), Enterococcus faecalis (47.6%), and Staphyloccocus aureus (34.9%). Anaerobes were identified in 38 (22.9%) cases. At 1 and 5-year follow-up, 39.31% (34) and 71.1% (61) of patients with S. epidermidis experienced treatment failure. On the other hand, those with S. aureus showed lower rates (log-rank p-value=0.03): 24.85% (14) and 50% (29), accordingly. Patients affected by anaerobes and E. faecalis exhibited similar trends, between them (log-rank p-value=0.73). Table1. Clinical findings of patients with polymicrobial PJI. Frequency distributions of sociodemographic factors, comorbidities, clinical presentation, outcomes, out-patient treatment, and etiology in patients with polymicrobial PJI. Data is presented as absolute frequency followed by relative frequency enclosed in parenthesis, otherwise specified. Abbreviations: SXT, Trimethoprim/Sulfamethoxazole. Figure 1. Kaplan‒Meier survivorship curve illustrating the time to treatment failure among patients with polymicrobial PJI. The shaded areas surrounding the gross line represent the 95% CI. Figure2. Kaplan‒Meier survivorship curves illustrating the time to treatment failure among patients with polymicrobial PJI, according to the infecting microorganisms.. Patients affected by S. epidermidis, E.faecalis, S. aureus, and anaerobes are represented with red, blue, green, and black lines, respectively. Conclusion Our study showed 61.53% of the patients with polymicrobial PJI controlled the infection at 1-year follow-up. This rate decreased over the years. These patients required a considerable number of hospitalizations and surgeries. Likewise, presenting with fistulae and pain ensured a high suspicion of PJI. S. epidermidis, E. faecalis, and S. aureus were the most frequent infecting microorganisms. The stratification of our cohort suggested the microbiology of polymicrobial PJI could have driven to differences in rates of treatment failure. Disclosures All Authors: No reported disclosures

Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Distrito Federal, Mexico Session: P-12. Bone and Joint Background. Approximately one-third of the prosthetic joint infections (PJIs) are polymicrobial. They are difficult to treat and there is an urgent need of clinical evidence that help to guide current protocols. We aimed to define the clinical characteristics and outcomes of patients with polymicrobial PJI.
Methods. We conducted a retrospective cohort study of patients with polymicrobial PJI treated at a referral hospital in Mexico City. Clinical data was retrieved and analyzed. Time to treatment failure, was evaluated for all cases.
Frequency distributions of sociodemographic factors, comorbidities, clinical presentation, outcomes, out-patient treatment, and etiology in patients with polymicrobial PJI. Data is presented as absolute frequency followed by relative frequency enclosed in parenthesis, otherwise specified. Abbreviations: SXT, Trimethoprim/Sulfamethoxazole. Patients affected by S. epidermidis, E.faecalis, S. aureus, and anaerobes are represented with red, blue, green, and black lines, respectively.
Conclusion. Our study showed 61.53% of the patients with polymicrobial PJI controlled the infection at 1-year follow-up. This rate decreased over the years. These patients required a considerable number of hospitalizations and surgeries. Likewise, presenting with fistulae and pain ensured a high suspicion of PJI. S. epidermidis, E. faecalis, and S. aureus were the most frequent infecting microorganisms. The stratification of our cohort suggested the microbiology of polymicrobial PJI could have driven to differences in rates of treatment failure.
Disclosures. All Authors: No reported disclosures Background. Spinal epidural abscess (SEA) remains a rare suppurative infection which bacteria invade the epidural space through contiguous spread or hematogenous dissemination. Diabetes mellitus (DM), IV drug abuse (IVDA), alcohol abuse, degenerative joint disease (DJD) have been shown to confer risk for SEA. Antimicrobial therapy is critical, but literature remains less clear on surgical intervention. Primary aim for study was to evaluated outcomes with SEA when treated with antibiotics alone compared to antibiotics and surgical intervention at our county hospital.

Evaluating Epidural Abscess Outcomes in a County Hospital with Antibiotic Therapy Alone Compared to Antibiotics and Surgical Intervention
Methods. A retrospective case series assessed patients 18 years or older at our county hospital with SEA consulted by infectious disease from 7/2009 to 7/2018. Data collected included demographics, social history (IVDA, alcohol abuse, homelessness), and microbiology results. Physician review of records determined if outcomes of SEA demonstrated improvement of symptoms compared to no improvement of symptoms.
Conclusion. Our retrospective study demonstrated no differences in outcome observed between patients treated with antibiotics alone compared to those with antibiotics plus surgical spinal intervention. Staphylococcus aureus was the most common organism. Management of patients with SEA currently remains individualized based on clinical condition, comorbidities and clinician judgement given limited literature. Proper sample collection for cultures and immediate intervention, either antibiotics only or antibiotics plus surgical interventions are crucial for better patient outcomes in SEA.