Outcomes Associated With Antimicrobial De-escalation of Treatment for Pneumonia Within the Veterans Healthcare Administration

Short and Concise Peer-to-Peer Teaching—Example of a Successful Antibiotic Stewardship Intervention to Increase Iv to Po Conversion

Antibiotic stewardship (ABS) programs aim to combine effective treatment with minimized antibiotic-related harms. Common ABS interventions are simple and effective, but their implementation in daily practice is often difficult. The aim of our study was to investigate if a single, short, peer-to-peer teaching intervention (junior doctor to junior doctor) during clinical routine can successfully improve antibiotic prescriptions. We performed a quasi-experimental before–after study on a regular care cardiology ward at a large academic medical center in Germany. We evaluated antibiotic use metrics retrospectively and calculated defined daily doses (DDD) with the anatomical therapeutic chemical/DDD classification system of the World Health Organization. We hypothesize that the over-representative use of intravenous administration is a potentially modifiable target, which can be proven by antibiotic use metrics analysis. After a single peer-to-peer teaching session with a focus on indications for iv to po conversion, the normalized percentage of intravenous compared to oral administration significantly decreased (from 86.5 ± 50.3% to 41.4 ± 70.3%). Moreover, after the intervention, antibiotics with high oral bioavailability were no longer administered intravenously at all during the following quarter. Our results indicate that even a single peer-to-peer training session is highly effective in improving the iv to po conversion rate in the short term.

Assessment of Antibiotic De-escalation by Spectrum Score in Patients With Nosocomial Pneumonia: A Single-Center, Retrospective Cohort Study

BACKGROUND

Hospital-acquired and ventilator-associated pneumonia (HAP/VAP) cause significant mortality. Guidelines recommend empiric broad-spectrum antibiotics followed by de-escalation (DE). This study sought to assess the impact of DE on treatment failure.

METHODS

This single-center retrospective cohort study screened all adult patients with a discharge diagnosis code for pneumonia from 2016 to 2019. Patients were enrolled if they met predefined criteria for HAP/VAP ≥48 hours after admission. Date of pneumonia diagnosis was defined as day 0. Spectrum scores were calculated, and DE was defined as a score reduction on day 3 versus day 1. Patients with DE were compared to patients with no de-escalation (NDE). The primary outcome was composite treatment failure, defined as all-cause mortality or readmission for pneumonia within 30 days of diagnosis.

RESULTS

Of 11860 admissions screened, 1812 unique patient-admissions were included (1102 HAP, 710 VAP). Fewer patients received DE (876 DE vs 1026 NDE). Groups were well matched at baseline, although more patients receiving DE had respiratory cultures ordered (56.6% vs 50.6%, P = .011). There was no difference in composite treatment failure (35.0% DE vs 33.8% NDE, P = .604). De-escalation was not associated with treatment failure on multivariable Cox regression analysis (hazard ratio, 1.13; 95% confidence interval, 0.96-1.33). Patients receiving DE had fewer antibiotic days (median 9 vs 11, P < .0001), episodes of Clostridioides difficile infection (2.2% vs 3.8%, P = .046), and hospital days (median 20 vs 22 days, P = .006).

CONCLUSIONS

De-escalation and NDE resulted in similar rates of 30-day treatment failure; however, DE was associated with fewer antibiotic days, episodes of C difficile infection, and days of hospitalization.

Impact of empirical oseltamivir discontinuation in hospitalized patients with community-acquired pneumonia after confirmed negative for influenza

OBJECTIVES

To study the effect of appropriate oseltamivir discontinuation in patients hospitalized with pneumonia, after they tested negative for influenza.

METHODS

A retrospective study was conducted at King Abdulaziz Medical City, Riyadh, Saudi Arabia. Patients admitted with a diagnosis of community-acquired pneumonia and started on empirical oseltamivir were included. The duration of stay at the hospital and readmission rates were identified. Additionally, we studied factors that led healthcare providers to continue patients on oseltamivir therapy despite testing negative for influenza.

RESULTS

A total of 210 patients were studied. The rate of empirical oseltamivir appropriate discontinuation was 31% (66 patients). No significant difference was noted between the 2 groups in the length of hospital stay (p=0.46). There was no significant difference in terms of 30-day (OR=0.67, 95% CI [0.28-1.59]), 60-day (OR=1.14, 95% CI [0.47, 2.78]), and 90-day readmission rates (OR=1.35, 95% CI [0.35-5.27]). After adjusting for other variables, admission to the intensive care unit was independently associated with appropriate discontinuation compared with patients admitted to general wards.

CONCLUSIONS

This study showed that appropriate discontinuation of empirical antiviral therapy is safe, effective, and has no impact on the length of stay and readmission rates.

Influence of microbiological culture results on antibiotic choices for veterans with hospital-acquired pneumonia and ventilator-associated pneumonia

OBJECTIVE

We examined the impact of microbiological results from respiratory samples on choice of antibiotic therapy in patients treated for hospital-acquired pneumonia (HAP) or ventilator-associated pneumonia (VAP).

DESIGN

Four-year retrospective study.

SETTING

Veterans' Health Administration (VHA).

PATIENTS

VHA patients hospitalized with HAP or VAP and with respiratory cultures between October 1, 2014, and September 30, 2018.

INTERVENTIONS

We compared patients with positive and negative respiratory culture results, assessing changes in antibiotic class and Antibiotic Spectrum Index (ASI) from the day of sample collection (day 0) through day 7.

RESULTS

Between October 1, 2014, and September 30, 2018, we identified 5,086 patients with HAP/VAP: 2,952 with positive culture results and 2,134 with negative culture results. All-cause 30-day mortality was 21% for both groups. The mean time from respiratory sample receipt in the laboratory to final respiratory culture result was longer for those with positive (2.9 ± 1.3 days) compared to negative results (2.5 ± 1.3 days; P < .001). The most common pathogens were Staphylococcus aureus and Pseudomonas aeruginosa. Vancomycin and β-lactam/β-lactamase inhibitors were the most commonly prescribed agents. The decrease in the median ASI from 13 to 8 between days 0 and 6 was similar among patients with positive and negative respiratory cultures. Patients with negative cultures were more likely to be off antibiotics from day 3 onward.

CONCLUSIONS

The results of respiratory cultures had only a small influence on antibiotics used during the treatment of HAP/VAP. The decrease in ASI for both groups suggests the integration of antibiotic stewardship principles, including de-escalation, into the care of patients with HAP/VAP.

De-escalation of Empiric Antibiotics Following Negative Cultures in Hospitalized Patients With Pneumonia: Rates and Outcomes

BACKGROUND

For patients at risk for multidrug-resistant organisms, IDSA/ATS guidelines recommend empiric therapy against methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas. Following negative cultures, the guidelines recommend antimicrobial de-escalation. We assessed antibiotic de-escalation practices across hospitals and their associations with outcomes in hospitalized patients with pneumonia with negative cultures.

METHODS

We included adults admitted with pneumonia in 2010-2015 to 164 US hospitals if they had negative blood and/or respiratory cultures and received both anti-MRSA and antipseudomonal agents other than quinolones. De-escalation was defined as stopping both empiric drugs on day 4 while continuing another antibiotic. Patients were propensity adjusted for de-escalation and compared on in-hospital 14-day mortality, late deterioration (ICU transfer), length-of-stay (LOS), and costs. We also compared adjusted outcomes across hospital de-escalation rate quartiles.

RESULTS

Of 14 170 patients, 1924 (13%) had both initial empiric drugs stopped by hospital day 4. Hospital de-escalation rates ranged from 2-35% and hospital de-escalation rate quartile was not significantly associated with outcomes. At hospitals in the top quartile of de-escalation, even among patients at lowest risk for mortality, the de-escalation rates were <50%. In propensity-adjusted analysis, patients with de-escalation had lower odds of subsequent transfer to ICU (adjusted odds ratio, .38; 95% CI, .18-.79), LOS (adjusted ratio of means, .76; .75-.78), and costs (.74; .72-.76).

CONCLUSIONS

A minority of eligible patients with pneumonia had antibiotics de-escalated by hospital day 4 following negative cultures and de-escalation rates varied widely between hospitals. To adhere to recent guidelines will require substantial changes in practice.

Impact of an antimicrobial stewardship program on outcomes in patients with community-acquired pneumonia admitted to a tertiary community hospital

PURPOSE

Results of a study evaluating the impact of an antimicrobial stewardship program (ASP) on clinical outcomes in patients hospitalized for community-acquired pneumonia (CAP) are reported.

METHODS

A retrospective records review was conducted at a 400-bed hospital to identify patients admitted over 3 years with CAP documented as a primary or secondary diagnosis. Clinical and medication-use outcomes during a 1-year baseline period and in the first and second years after ASP implementation (post-ASP years 1 and 2) were analyzed. A local CAP guideline was implemented around the beginning of post-ASP year 2.

RESULTS

The mean hospital length of stay declined from 7.24 days in the baseline period to 5.71 days in post-ASP year 1 (p = 0.011) and 5.52 days in post-ASP year 2 (p = 0.008). Mean inpatient antimicrobial days of therapy (DOT) declined from 5.68 days in the baseline period to 5.08 days (p = 0.045) and 4.99 days (p = 0.030) in post-ASP years 1 and 2, respectively. Mean DOT per 100 total days of antimicrobial therapy declined from 9.69 days in the baseline period to 8.85 days in post-ASP year 1 (p = 0.019) and 8.38 days in post-ASP year 2 (p = 0.001).

CONCLUSION

ASP implementation was associated with specific clinical benefits in patients with CAP, including decreased length of stay, decreased durations of antimicrobial therapy, and a shift in utilization to a primary regimen shown to produce superior clinical outcomes.