bluuebunny/crossref_metadata_2025_split huggingface dataset:
1409. Pulmonary Non-tuberculous Mycobacterium Infection (PNTMI) and COVID-19: Characterization of the National COVID Collaborative Cohort (N3C)
Authors: Figueroa Castro Carlos E , Hersh William 
Published: December 2021

Abstract

Background
Establishing whether a low-prevalence clinical condition is a risk factor for COVID-19 infection, or serious adverse outcomes, is difficult due to a limited number of patients, and lack of access to patient’s data by researchers. The National COVID Collaborative Cohort (N3C), a centralized national data resource to study COVID-19, provides access to structured clinical data derived from electronic health records. As of June 2021, N3C contains data on 6,193,738 patients (2,090,138 with COVID-19, 33.7%) from 55 participating sites (Figure 1). We describe the characteristics of patients with PNTMI based on COVID-19 infection status.
Figure 1

N3C Basic Demographic Data

Methods
COVID-19 is defined by positive lab result (PCR, antigen, or antibody) or COVID-19 coding diagnosis, as defined by N3C. PNTMI phenotype was built with N3C Data Enclave concept set tool, and ATLAS (https://atlas.ohdsi.org/). We limited analysis to adults (18 years-old or older). We used de-identified data sets stripped of protected health information (PHI). We used N3C Data Enclave analytical tools for exploratory data analysis, and descriptive statistics.

Results
We identified five hundred and eighty six individuals from 19 sites fulfilling the PNTMI phenotype (9.46 cases per 100,000 people). After our age limit, 555 individuals were included for analysis (Figure 2). 340 were females (61.3%), 447 of white race (80.5%), and 30 were Hispanic (5.4%). Additional descriptive statistics and statistical significance testing are provided (Table 1). The most common concept were "Non-tuberculous mycobacterial pneumonia", and "Pulmonary Mycobacterium avium complex infection". Four sites accounted for more than 50% of identified patients (Figure 2). We identified 24 individuals with COVID-19 (4.32%), and 44 deaths in this cohort (7.9%). Deaths were unrelated to COVID-19 event.

Figure 2. Basic demographic data of pulmonary non-tuberculous Mycobacterium infection phenotype in N3C

Figure 3. Concepts and data sources of pulmonary non-tuberculous Mycobacterium infection phenotype in N3C

Conclusion
In N3C, the PNTMI cohort has a lower proportion of COVID-19 infection than the general population, and it was not a cause of mortality. Further analysis to study impact of comorbidities, and differences in race and geographical location are warranted. N3C is a powerful research platform to study the impact of COVID-19 in special populations with low prevalence, and it can be used to study other populations of interest.

Disclosures
All Authors: No reported disclosures
1412. Clinical Epidemiology and Characteristics of Pulmonary Nontuberculous Mycobacterial Isolates from a Large Academic Military Treatment Facility
Authors: Ford Mary B , Okulicz Jason , Salinas Jesse , Kiley John 
Published: December 2021

Abstract

Background
Non-tuberculous mycobacteria (NTM) are ubiquitous in the environment and include pathogenic and nonpathogenic species. Although prevalence appears to be increasing in the US, diagnosis and treatment can be challenging. This study describes the epidemiology and clinical characteristics of pulmonary NTM (pNTM) isolates at Brooke Army Medical Center (BAMC).

Methods
BAMC pulmonary NTM isolates from 2012-2020 were included. Corresponding electronic health records were reviewed for epidemiologic, microbiologic, and clinical data. Pulmonary NTM infection (pNTMi) was defined using 2020 NTM guidelines and patients were divided into 2 groups based on whether guideline criteria for pNTMi were met. Demographic, microbiologic, and clinical characteristics were compared between groups.

Results
A total of 813 isolates from 225 patients were analyzed (median 2 [IQR 1-4] isolates per patient). Approximately half (49.7%) were female with a median age of 71 years (IQR 62-79, Table 1), and the majority were current or former smokers (57.3%). Compared to those not meeting criteria (n=116; 51.6%), pNTMi patients (n=109; 48.4%) more commonly had bronchiectasis (47.7% vs 27.6; p=0.002) but were less likely to have solid organ malignancy (11.9% vs 23.3%; p=0.036). A higher proportion of pNTMi patients were female (58% vs 42%; p=0.005) and had lower median Body Mass Index (BMI, 22.6 vs 25.1; p=0.001). M. avium complex (MAC) was more common among pNTMi patients (75.2% vs 35.3%; p=0.001). In contrast, M. simiae and M. gordonae were more likely to be isolated from those not meeting criteria (25.9% vs. 10.1%; p=0.003 and 16.4% vs. 1.8%; p=0.001, respectively). Among pNTMi patients, 60 (55%) were offered therapy and were more likely to be younger (70 [IQR 63-76] vs. 73 [IQR 65-82] years; p=0.049), have chronic obstructive pulmonary disease (COPD; 51.7% vs 24.5%; p=0.006) and MAC (88.3% vs. 59.2%; p=0.001) compared to untreated patients (Table 2).

Conclusion
Approximately half of pNTM isolates were observed in patients who did not meet criteria for pNTMi diagnosis. Female patients, lower BMI, bronchiectasis, or MAC isolation were more likely to meet pNTMi criteria. Management of pNTMi remains a challenge, with younger patients with COPD and MAC more likely to receive treatment.

Disclosures
All Authors: No reported disclosures
1413. Effect of Automated Identification of Antimicrobial Stewardship Opportunities for Urinary Tract Infections
Authors: Deri Connor , Wrenn Rebekah , Moehring Rebekah W , Spivey Justin , Yarrington Michael E 
Published: December 2021

Abstract

Background
The treatment of asymptomatic bacteriuria (ASB) does not improve clinical outcomes in most patients and may be associated with an increased risk of adverse events such as Clostridioides difficile infection. A best practice alert (BPA) was created to identify patients with possible ASB for antimicrobial stewardship (AS) review. We aimed to determine whether automated identification of ASB improved the timing of stewardship intervention.

Methods
An electronic health record BPA message to inpatient AS pharmacists was activated on 01/19/2021. The BPA identified inpatients with a new antibiotic order with an associated genitourinary indication and a preceding urinalysis with 0 to 5 WBC/hpf. BPAs were reviewed by an AS pharmacist during weekdays and normal business hours. We retrospectively evaluated the impact of the BPA on time from order to stewardship intervention between a cohort of pre-BPA (01/2020 to 12/2020) and post-BPA (01/20/2021 to 04/10/2021) patients. Included patients met the BPA criteria and had an AS intervention within 7 days of the antibiotic order. We specified interventions that were UTI-related. The median time from antibiotic order entry to any AS intervention was compared pre- to post-BPA using the Mann Whitney U test. Rates of UTI-related interventions were compared with Fisher’s Exact test.

Results
327 antibiotic orders met BPA criteria and were analyzed: 245 and 82 in the pre- and post-BPA group, respectively. Groups had similar baseline characteristics (Table 1). A total of 33 (27 UTI-related) pre-BPA group and 24 (17 UTI-related) post-BPA group interventions were documented by the AS team. The median time to any intervention was 28 hours (IQR 18-64.5) in the pre-BPA group compared to 13.5 hours (IQR 3.5-28.75) in the post-BPA group (p = 0.03, Figure). The pre-BPA group had a lower rate of UTI-related interventions compared to the post-BPA group (11.0% vs 20.7%, p = .04).

Conclusion
Automated identification of antibiotics targeting UTI with urinalysis showing absence of pyuria reduced the time to stewardship intervention and increased rate of UTI-specific interventions. The use of clinical decision support may aid in efficiency of AS review and syndrome-targeted AS impact.

Disclosures
Rebekah W. Moehring, MD, MPH, UpToDate, Inc. (Other Financial or Material Support, Author Royalties)
1415. Allergies to Antimicrobial Agents Among US Females with Uncomplicated Urinary Tract Infection
Authors: Thompson Jeffrey , Marijam Alen , Mitrani-Gold Fanny S , Wright Jonathon , Joshi Ashish V 
Published: December 2021

Abstract

Background
Uncomplicated urinary tract infections (uUTI) are generally treated empirically with antibiotics. However, antibiotic (AB) allergies limit the available oral treatment options for some patients. We assessed the proportion of self-reported AB allergies among US females with uUTI.

Methods
We performed a cross-sectional survey of US females ≥ 18 years of age with a self-reported urinary tract infection (UTI) in the 60 days prior to participation and a prescription of oral AB. Participants were further screened for evidence of a complicated urinary tract infection and, after exclusions, participants with a uUTI completed an online questionnaire about their most recent episode. Participants were from the Northeast (20%), Midwest (44%), South (20%), and West (16%) US. Descriptive self-reported allergy data were stratified into subgroups by whether the participant had recurrent UTI (defined as ≥ 2 uUTIs in the past 6 months or ≥ 3 uUTIs in past 12 months including index UTI), the number of different ABs given for the index episode (1, 2, ≥ 3), and whether the treatment was clinically appropriate according to Infectious Diseases Society of America uUTI guidelines.

Results
Overall, 375 female participants completed the questionnaire. The most commonly prescribed ABs for participants’ most recent uUTI were trimethoprim-sulfamethoxazole (TMP-SMX; 38.7%), ciprofloxacin (22.7%), and nitrofurantoin (18.9%) (Table 1). Most participants received only 1 AB for their uUTI (62.7%) and the majority were classified as having a non-recurrent uUTI (56.5%). No AB allergies were reported for most participants (69.3%); overall, 24.0% reported 1 AB allergy and 6.7% reported ≥ 2. A higher proportion of participants reported ≥ 2 allergies in the recurrent uUTI, ≥ 3 AB, and multiple AB subgroups (Table 2). The most common allergy was to TMP-SMX (15.7%), followed by amoxicillin-clavulanate (8.3%) and ciprofloxacin (5.3%) (Table 2). Similar allergy trends were seen across subgroups, except higher rates of ciprofloxacin allergy were seen in participants given multiple ABs (Table 2).
Table 1. Antibiotics used to treat most recent uUTI

Table 2 . Frequency of antibiotic allergies across cohort subgroups

Conclusion
AB allergies were relatively frequent in this uUTI cohort and the most common allergy was to TMP-SMX, which was the most prescribed AB. Allergies to ABs reduce the available treatment options for uUTI in some patients.

Disclosures
Jeffrey Thompson, PhD, Kantar Health (Employee, Employee of Kantar Health, which received funding from GlaxoSmithKline plc. to conduct this study) Alen Marijam, MSc, GlaxoSmithKline plc. (Employee, Shareholder) Fanny S. Mitrani-Gold, MPH, GlaxoSmithKline plc. (Employee, Shareholder) Jonathon Wright, BSc, Kantar Health (Employee, Employee of Kantar Health, which received funding from GlaxoSmithKline plc. to conduct this study) Ashish V. Joshi, PhD, GlaxoSmithKline plc. (Employee, Shareholder)
1416. Medicare Spending on Urinary Tract Infections: A Retrospective Database Analysis
Authors: Sulham Kate , Hammelman Eric 
Published: December 2021

Abstract

Background
Medical visits for UTIs represent 1%-6% of all healthcare visits (~7 million visits) and are estimated to cost the United States (US) healthcare system at least &1.6 billion annually. UTIs are associated with significant morbidity; particularly among the elderly, where UTIs are most prevalent. Little is known about the specific costs to Medicare of UTI; here, we seek to examine overall Medicare spending on UTI.

Methods
We conducted a retrospective multicenter cohort study of the Medicare fee-for-service (FFS) data. Patients were included for analysis if the following criteria were met: (1) enrolled in Medicare FFS from January 1, 2016 through December 31, 2019, (2) not enrolled in Medicare Advantage during that time period, (3) did not have any UTI diagnoses in 2016, and (4) enrolled in Medicare Part D. Individuals were categorized as having uncomplicated UTI (uUTI), complicated UTI (cUTI), or those who first had a uUTI that progressed to a cUTI (uUTI to cUTI). Medicare spending in the 12 months post-diagnosis was calculated, and patients were stratified by home- or institutionally-based (eg, nursing home, long-term care facility, etc.).

Results
2,330,123 patients were included for analysis; 92% were home-based, 8% were institutionally-based. Mean Charlson Comorbidity Index (CCI) across all patients was 2.16. In the 12 months after initial diagnosis, average Medicare spend was &33,984, &9,941 of which was UTI-related. Annual UTI-related costs were approximated &9,000 for home-based vs. &21,444 for institutionally-based patients. Mean drug spend per patient on antibiotics was &872. Broadly, uUTI patients were least expensive, followed by cUTI patients, with uUTI to cUTI patients being most expensive. Higher costs for were observed for institutionally-based patients, largely due to more frequent acute hospitalizations and more Part A-paid skilled nursing stays.

Conclusion
UTI-related spending represents approximately one-third of total annual Medicare spend for patients diagnosed with a UTI. Given average Medicare spending of approximately &12,000 per person in 2019, UTI is associated with substantially increased per patient cost and represents a significant source of spending for Medicare.

Disclosures
Kate Sulham, MPH, Spero Therapeutics (Consultant) Eric Hammelman, MBA, AbbVie Pharmaceuticals (Consultant)Edwards Lifesciences (Consultant)Genentech (Consultant)Spero Therapeutics (Consultant)Vertex Pharmaceuticals (Consultant)
161. The Agency for Healthcare Research and Quality (AHRQ) Safety Program for Improving Antibiotic Use: Antibiotic Stewardship Intervention in 389 United States Ambulatory Practices during the COVID-19 Pandemic
Authors: Keller Sara C , Caballero Tania M , Tamma Pranita , Tamma Pranita , Miller Melissa A , Dullabh Prashila , Ahn Roy , Shah Savyasachi V , Gao Yue , Speck Kathleen , Cosgrove Sara E , Cosgrove Sara E , Linder Jeffrey A 
Published: December 2021

Abstract

Background
The AHRQ Safety Program for Improving Antibiotic Use aimed to improve antibiotic use by engaging clinicians and staff to incorporate antibiotic stewardship (AS) into practice culture, communication, and decision making. We report on changes in visits and antibiotic prescribing in AHRQ Safety Program ambulatory practices during the COVID-19 pandemic.

Methods
The Safety Program used webinars, audio presentations, educational tools, and office hours to engage clinician champions and staff leaders to: (a) address attitudes and culture that pose challenges to judicious antibiotic prescribing and (b) incorporate best practices for the management of common infections into their workflow using the Four Moments of Antibiotic Decision Making framework. Total visits (in-person and virtual), acute respiratory infection (ARI) visits, and antibiotic prescribing data were collected. Using linear mixed models to account for random effects of participating practices and repeated measurements of outcomes within practices over time, data from the pre-intervention period (September-November 2019) and the Ambulatory Care Safety Program (December 2019-November 2020) were compared.

Results
Of 467 practices enrolled, 389 (83%) completed the program, including 162 primary care practices (42%; 23 [6%] pediatric), 160 urgent care practices (41%; 40 [10%] pediatric), and 49 federally-supported practices (13%). 292 practices submitted complete data for analysis, including 6,590,485 visits. Visits/practice-month declined March-May 2020 but gradually returned to baseline by program end (Figure 1). Total antibiotic prescribing declined by 9 prescriptions/100 visits (95% CI: -10 to -8). ARI visits/practice-month declined significantly in March-May 2020, then increased but remained below baseline by program end (Figure 2). ARI-related antibiotic prescriptions decreased by 15/100 ARI visits by program end (95% CI: -17 to -12). The greatest reduction was in penicillin class prescriptions with a reduction of 7/100 ARI visits by program end (95% CI: -9 to -6).

Conclusion
During the COVID-19 pandemic, a national ambulatory AS program was associated with declines in overall and ARI-related antibiotic prescribing.

Disclosures
Pranita Tamma, MD, MHS, Nothing to disclose Sara E. Cosgrove, MD, MS, Basilea (Individual(s) Involved: Self): Consultant Jeffrey A. Linder, MD, MPH, FACP, Amgen (Shareholder)Biogen (Shareholder)Eli Lilly (Shareholder)
1419. High Prevalence of Fluoroquinolone-Resistant Urinary Tract Infection Among US Emergency Department Patients Diagnosed with UTI, 2018-2020
Authors: Faine Brett , Rech Megan A , Vakkalanka Priyanka , Talan David A 
Published: December 2021

Abstract

Background
Uropathogen resistance, Fluoroquinolone-resistance (FQR) and Extended spectrum beta-lactamase (ESBL), has been observed to be emerging worldwide with prevalences above recommended thresholds for routine empirical treatment. We sought to determine recent resistance prevalence from a geographically diverse sample of US Emergency Departments (ED).

Methods
We conducted a multi-center, observational cohort study utilizing a network of 15 geographically diverse US EDs. Patients ≥ 18 years of age with the primary international classification of diseases (ICD-10) diagnosis code of cystitis, pyelonephritis, or urinary tract infection (UTI) and were discharged home from the ED from 2018-2020 were included. We calculated descriptive statistics for uropathogens and susceptibilities. Logistic regression analysis was used to identify antimicrobial resistance risk factors associated with fluoroquinolone (FQ)-resistant Escherichia coli.

Results
Among 3,779 patients who met inclusion criteria, median age was 62.9 years (IQR: 41-77.6) and 76.3% were female. The most common diagnoses were complicated (40.9%) and uncomplicated cystitis (39.4%). Six hundred and forty-five (17%) patients reported receiving antimicrobials in the previous 90-days. E. coli was the most common pathogen (62.9%), followed by Klebsiella pneumoniae (13%) and Enterococcus species (5.8%). Across all sites, overall E. coli FQ-resistance prevalence was 22.1%, ranging from 10.5 to 29.7% by site. The prevalence of ESBL-producing uropathogen was 4.4%, ranging from 2.3% to 8.6% by site. Previous IV or oral antimicrobial use in the last 90-days and complicated vs. uncomplicated UTI were associated with FQ-resistant E. coli (OR 1.69, 95% CI: 1.33-2.14, and OR 1.60, 95% CI: 1.26-2.02, respectively). Of the most prescribed oral antibiotics upon patients discharged from the ED, E. coli resistance to nitrofurantoin and cephalexin was 1.8% and 0.9%, respectively.

Conclusion
FQ-resistant E. coli is widely prevalent and ESBL-mediated resistance appears to be emerging across US sites highlighting the need for ongoing monitoring of antimicrobial resistance and, at some locations, modification of empirical treatments.

Disclosures
Brett Faine, PharmD, Spero Therapeutics (Research Grant or Support) Megan A. Rech, PharmD, MS, BCCCP, FCCM, Spero (Research Grant or Support) David A. Talan, MD, AbbVie (Consultant)GSK (Consultant)SPERO Therapeutics (Grant/Research Support)
1420. Descriptive Epidemiology of UTI Hospitalizations in the US, 2018
Authors: Zilberberg Marya , Nathanson Brian , Sulham Kate 
Published: December 2021

Abstract

Background
In parallel with an increase in antimicrobial resistance, urinary tract infections (UTI), one of the most common diagnoses among hospitalized patients in the US, have been on the rise. Though mostly emphasized as a hospital-acquired complication among patients with an indwelling catheter, quantification of the full contemporary burden of UTI-associated hospitalizations is limited.

Methods
We conducted a cross-sectional multicenter study within the National Inpatient Sample (NIS) database, a 20-percent stratified sample of discharges from US community hospitals, from 2018, to explore characteristics of patients discharged with a UTI diagnosis. We divided UTI into mutually exclusive categories of complicated (cUTI), uncomplicated (uUTI), and catheter-associated (CAUTI). We applied survey methods to develop national estimates.

Results
Among 2,837,385 discharges with a UTI code, 77.9% were uUTI, 17.6% cUTI, and 4.4% CAUTI. Compared to patients with uUTI (mean age 69.0 years), those with CAUTI and cUTI were older (70.1 and 69.7 years), but had same comorbidity burden (mean Charlson 4.3) as cUTI (4.3) and lower than CAUTI (4.6). Compared to other geographic regions, the Northeast had the lowest proportion of uUTI (74.6%) and highest of cUTI (20.8%) while the South had highest uUTI (80.2%) and lowest cUTI (15.7%). Over 60% of all UTI, regardless of type, were in large, and nearly ½ in urban teaching, institutions, and &gt;80% came through the emergency department. Antimicrobial resistance codes were infrequent, but extended spectrum beta-lactamase organisms were more common in CAUTI (2.7%) and cUTI (2.1%) than in uUTI (1.6%). Among the 83.0% of discharges whose UTI was a secondary diagnosis, sepsis was the most common principal diagnosis, ranging from 17.7% in uUTI to 22.3% in cUTI. Although relatively low across the board, hospital mortality was lowest in cUTI (2.8%) and highest in uUTI (3.9%). Discharges to a chronic care facility were most common in CAUTI (46.7%) and least common in cUTI (33.3%).

Conclusion
There are nearly 3 million hospital admissions with a UTI, comprising fully 8% of all annual admissions in the US. Though most are considered uncomplicated, there are few differences in characteristics or outcomes across the categories.

Disclosures
Marya Zilberberg, MD, MPH, Cleveland Clinic (Consultant)J&J (Shareholder)Lungpacer (Consultant, Grant/Research Support)Merck (Grant/Research Support)scPharma (Consultant)Sedana (Consultant, Grant/Research Support)Spero (Grant/Research Support) Brian Nathanson, PhD, Lungpacer (Grant/Research Support)Merck (Grant/Research Support)Spero (Grant/Research Support) Kate Sulham, MPH, Spero Therapeutics (Consultant)