BackgroundStaphylococcus aureus bacteraemia (SAB) carries high rates of morbidity and mortality. Antimicrobial stewardship programmes (ASPs) are well situated to promote adherence to quality performance measures in order to optimize the management of SAB and associated clinical outcomes.
Abstract Background Recent literature suggests that AmpC production may be overcalled in Enterobacterales, leading to unnecessary broad-spectrum antimicrobial utilization. The Infectious Diseases Society of America (IDSA) has since reassessed classification of high and low risk organisms with inducible AmpC expression. With this updated guidance, our health system approved changes to our microbiology reporting of AmpC producers in an effort to guide prescribing of appropriate antibiotics. The primary objective of this project was to compare antibiotic prescribing patterns for high and low risk AmpC producers in patients with bloodstream infections (BSI) based on the addition of appended comments to antimicrobial susceptibility results. Methods This multicenter, retrospective, cohort study included patients with BSI from October 2022 to March 2023who received at least 48 hours of antimicrobial therapy for the following high and low risk AmpC producers: Citrobacter spp., Enterobacter spp., Klebsiella aerogenes, Serratia spp., Morganella spp., Providencia spp. The primary endpoint was the number of patients placed on optimal therapy based on adherence to the appended microbiology comment and IDSA guidance. Secondary endpoints included time to effective treatment, time to optimal treatment, duration of therapy, 30 day mortality, microbiological failure, microbiological relapse, 30 day readmission, length of stay, and hospital acquired Clostridioides difficile infection. Results A total of 191 positive blood cultures were identified with 93 patients (pre-appended comment = 57; post-appended comment = 36) meeting inclusion criteria. Patients were more likely to receive optimal therapy post-appended comment based on IDSA guidance for BSI (38.6% vs 72.2%, OR 4.14; 1.68-10.21). When stratified by high risk and low risk organism, the number of patients on optimal therapy increased in the post-appended comment group but was not statistically significant (high risk: 70.3% vs 88%, OR 3.08; 0.72-13.32; low risk: 10% vs 36.3%, 5.14; 0.92-28.50). No difference in secondary outcomes were detected. Conclusion Implementation of an appended microbiology note has the potential to have a positive impact on antimicrobial prescribing patterns in treatment of AmpC bloodstream infections. Disclosures All Authors: No reported disclosures
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Fluoroquinolones (FQs) are often preferred as oral step-down therapy for bloodstream infections (BSIs) due to favorable pharmacokinetic parameters; however, they are also associated with serious adverse events. The objective of this study was to compare clinical outcomes for patients who received an oral FQ versus an oral beta-lactam (BL) as step-down therapy for uncomplicated streptococcal BSIs. This multicenter, retrospective cohort study analyzed adult patients who completed therapy with an oral FQ or BL with at least one blood culture positive for a Streptococcus species from 1 January 2014 to 30 June 2019.
Abstract Background The Clinical and Laboratory Standards Institute (CLSI) lowered the minimum inhibitory concentration (MIC) breakpoints of various β-lactam antimicrobials eliminating the need for confirmatory testing of extended-spectrum β-lactamase (ESBL) organisms. Our institution adopted the new CLSI breakpoints in June 2015. This multi-site study assessed the impact of laboratory cessation of ESBL reporting on the MIC distribution of commonly used antimicrobials and clinical outcomes. Methods This retrospective study included adult inpatients with positive blood cultures for Escherichia coli, Klebsiella pneumoniae, K. oxytoca, or Proteus mirabilis from June 2012 to June 2018. Patients were included in the pre-implementation group if they had an ESBL-positive blood culture from June 2012 to May 2015 and in the post-implementation group if they had a ceftriaxone-resistant organism from June 2015 to June 2018. Patients who died or transitioned to hospice within 48 hours of blood culture identification or before final susceptibilities were excluded. The primary outcome was MIC distribution of ceftriaxone, ceftazidime, cefepime, piperacillin/tazobactam, fluoroquinolones, and carbapenems. Secondary outcomes were antimicrobial prescribing patterns, 30-day all-cause mortality, 30-day re-infection rate, and time to microbiological clearance. Results A total of 249 patients were included (n = 40, pre-implementation; n = 209, post-implementation). Pitt Bacteremia Scores were significantly higher in the pre-implementation group (3.59 ± 2.85 vs. 2.21 ± 2.06; P = 0.0004). The median MIC distribution for each antimicrobial stayed within one dilution throughout the study timeframe. Carbapenem use decreased in the post-implementation group [n = 35 (87%) vs. n = 131 (63%)]. No significant differences were noted for other secondary outcomes: 30-day all-cause mortality (15% vs. 10%; P = 0.40), 30-day re-infection rate (2.5% vs. 4.3%; P = 1), and time to microbiological clearance (2.28 ± 1.2 vs. 2.41 ± 1.76 days; P = 0.72). Conclusion Adoption of lowered CLSI breakpoints did not impact MIC distribution of select antimicrobials for Enterobacteriaceae; however, it has affected antimicrobial prescribing patterns. Disclosures All authors: No reported disclosures.
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Stenotrophomonas maltophilia is intrinsically resistant to several antibiotics, making it potentially challenging to treat. Studies have demonstrated treatment failures and resistance development with monotherapy (MT); however, clinical data are limited with combination therapy (CT).To compare clinical outcomes with CT versus MT for S. maltophilia pneumonia.This was a retrospective cohort study of patients admitted between November 2011 and October 2017 with S. maltophilia pneumonia who received at least 48 h of effective therapy. The primary outcome was clinical response after 7 days of effective therapy with CT versus MT. Secondary outcomes included development of a non-susceptible isolate, 30 day microbiological cure, infection recurrence, infection-related mortality and all-cause mortality. The Wilcoxon rank sum test, the Pearson χ2 test and Fisher's exact test were utilized for univariate analyses. A multivariable logistic regression model was used to assess clinical response while adjusting for confounding variables.Of 252 patients with S. maltophilia pneumonia included, 38 received CT and 214 received MT. There was no difference in 7 day clinical response with CT versus MT (47.4% versus 39.7%, P = 0.38), even after controlling for immune status, APACHE II score and polymicrobial pneumonia (adjusted OR 1.51, 95% CI 0.63-3.65). Thirty day microbiological cure (P = 0.44), recurrence (P = 0.53), infection-related mortality (P = 0.19) and isolation of a non-susceptible isolate during or after therapy (P = 1.00 each) were also similar between both groups; however, 30 day all-cause mortality was greater with CT (P = 0.03).CT had similar rates of clinical efficacy and resistance development compared with MT for S. maltophilia pneumonia.
The purpose of this study was to evaluate the impact of infectious diseases consultation (IDC) and a real-time antimicrobial stewardship (AMS) review on the management of Staphylococcus aureus bacteremia (SAB).This retrospective study included adult inpatients with SAB from January 2016 to December 2018 at 7 hospitals. Outcomes were compared between 3 time periods: before mandatory IDC and AMS review (period 1), after mandatory IDC and before AMS review (period 2), and after mandatory IDC and AMS review (period 3). The primary outcome was bundle adherence, defined as appropriate intravenous antimicrobial therapy, appropriate duration of therapy, appropriate surveillance cultures, echocardiography, and removal of indwelling intravenous catheters, if applicable. Secondary end points included individual bundle components, source control, length of stay (LOS), 30-day bacteremia-related readmission, and in-hospital all-cause mortality.A total of 579 patients met inclusion criteria for analysis. Complete bundle adherence was 65% in period 1 (n = 241/371), 54% in period 2 (n = 47/87), and 76% in period 3 (n = 92/121). Relative to period 3, bundle adherence was significantly lower in period 1 (odds ratio [OR], 0.58; 95% confidence interval [CI], 0.37-0.93; P = .02) and period 2 (OR, 0.37; 95% CI, 0.20-0.67; P = .0009). No difference in bundle adherence was noted between periods 1 and 2. Significant differences were seen in obtaining echocardiography (91% vs 83% vs 100%; P < .001), source control (34% vs 45% vs 45%; P = .04), and hospital LOS (10.5 vs 8.9 vs 12.0 days; P = .01). No differences were noted for readmission or mortality.The addition of AMS pharmacist review to mandatory IDC was associated with significantly improved quality care bundle adherence.
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