Implementing an Antibiotic Stewardship Program: Guidelines by the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America

Evidence-based guidelines for implementation and measurement of antibiotic stewardship interventions in inpatient populations including long-term care were prepared by a multidisciplinary expert panel of the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America. The panel included clinicians and investigators representing internal medicine, emergency medicine, microbiology, critical care, surgery, epidemiology, pharmacy, and adult and pediatric infectious diseases specialties. These recommendations address the best approaches for antibiotic stewardship programs to influence the optimal use of antibiotics.

Diagnosis and treatment of Clostridium difficile in adults: a systematic review

IMPORTANCE

Since 2000, the incidence and severity of Clostridium difficile infection (CDI) have increased.

OBJECTIVE

To review current evidence regarding best practices for the diagnosis and treatment of CDI in adults (age ≥ 18 years).

EVIDENCE REVIEW

Ovid MEDLINE and Cochrane databases were searched using keywords relevant to the diagnosis and treatment of CDI in adults. Articles published between January 1978 and October 31, 2014, were selected for inclusion based on targeted keyword searches, manual review of bibliographies, and whether the article was a guideline, systematic review, or meta-analysis published within the past 10 years. Of 4682 articles initially identified, 196 were selected for full review. Of these, the most pertinent 116 articles were included. Clinical trials, large observational studies, and more recently published articles were prioritized in the selection process.

FINDINGS

Laboratory testing cannot distinguish between asymptomatic colonization and symptomatic infection with C difficile. Diagnostic approaches are complex due to the availability of multiple testing strategies. Multistep algorithms using polymerase chain reaction (PCR) for the toxin gene(s) or single-step PCR on liquid stool samples have the best test performance characteristics (for multistep: sensitivity was 0.68-1.00 and specificity was 0.92-1.00; and for single step: sensitivity was 0.86-0.92 and specificity was 0.94-0.97). Vancomycin and metronidazole are first-line therapies for most patients, although treatment failures have been associated with metronidazole in severe or complicated cases of CDI. Recent data demonstrate clinical success rates of 66.3% for metronidazole vs 78.5% for vancomycin for severe CDI. Newer therapies show promising results, including fidaxomicin (similar clinical cure rates to vancomycin, with lower recurrence rates for fidaxomicin, 15.4% vs vancomycin, 25.3%; P = .005) and fecal microbiota transplantation (response rates of 83%-94% for recurrent CDI).

CONCLUSIONS AND RELEVANCE

Diagnostic testing for CDI should be performed only in symptomatic patients. Treatment strategies should be based on disease severity, history of prior CDI, and the individual patient's risk of recurrence. Vancomycin is the treatment of choice for severe or complicated CDI, with or without adjunctive therapies. Metronidazole is appropriate for mild disease. Fidaxomicin is a therapeutic option for patients with recurrent CDI or a high risk of recurrence. Fecal microbiota transplantation is associated with symptom resolution of recurrent CDI but its role in primary and severe CDI is not established.

Executive Summary: Implementing an Antibiotic Stewardship Program: Guidelines by the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America

Evidence-based guidelines for implementation and measurement of antibiotic stewardship interventions in inpatient populations including long-term care were prepared by a multidisciplinary expert panel of the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America. The panel included clinicians and investigators representing internal medicine, emergency medicine, microbiology, critical care, surgery, epidemiology, pharmacy, and adult and pediatric infectious diseases specialties. These recommendations address the best approaches for antibiotic stewardship programs to influence the optimal use of antibiotics.

Surveillance definitions of infections in long-term care facilities: revisiting the McGeer criteria

(See the commentary by Moro, on pages 978-980 .) Infection surveillance definitions for long-term care facilities (ie, the McGeer Criteria) have not been updated since 1991. An expert consensus panel modified these definitions on the basis of a structured review of the literature. Significant changes were made to the criteria defining urinary tract and respiratory tract infections. New definitions were added for norovirus gastroenteritis and Clostridum difficile infections.

Association between sarcopenia and the risk of serious infection among adults undergoing liver transplantation

Although sarcopenia (muscle loss) is associated with increased mortality after liver transplantation, its influence on other complications is less well understood. We examined the association between sarcopenia and the risk of severe posttransplant infections among adult liver transplant recipients. By calculating the total psoas area (TPA) on preoperative computed tomography scans, we assessed sarcopenia among 207 liver transplant recipients. The presence or absence of a severe posttransplant infection was determined by a review of the medical chart. The influence of posttransplant infections on overall survival was also assessed. We identified 196 episodes of severe infections among 111 patients. Fifty-six patients had more than 1 infection. The median time to the development of an infection was 27 days (interquartile range = 13-62 days). When the patients were grouped by TPA tertiles, patients in the lowest tertile had a greater than 4-fold higher chance of developing a severe infection in comparison with patients in the highest tertile (odds ratio = 4.6, 95% confidence interval =  2.25-9.53). In a multivariate analysis, recipient age (hazard ratio = 1.04, P = 0.02), pretransplant TPA (hazard ratio = 0.38, P < 0.01), and pretransplant total bilirubin level (hazard ratio = 1.05, P = 0.02) were independently associated with the risk of developing severe infections. Patients with severe posttransplant infections had worse 1-year survival than patients without infections (76% versus 92%, P = 0.003). In conclusion, among patients undergoing liver transplantation, a lower TPA was associated with a heightened risk for posttransplant infectious complications and mortality. Future efforts should focus on approaches for assessing and mitigating vulnerability in patients undergoing transplantation.

Clostridium difficile ribotype does not predict severe infection

BACKGROUND

Studies of Clostridium difficile outbreaks suggested that certain ribotypes (eg, 027 and 078) cause more severe disease than other ribotypes. A growing number of studies challenge the validity of this hypothesis.

METHODS

We conducted a cross-sectional study of C. difficile infection (CDI) to test whether ribotype predicted clinical severity when adjusted for the influence of other predictors. Toxigenic C. difficile isolates were cultured from stool samples, screened for genes encoding virulence factors by polymerase chain reaction (PCR) and ribotyped using high-throughput, fluorescent PCR ribotyping. We collected data for 15 covariates (microbiologic, epidemiologic, and laboratory variables) and determined their individual and cumulative influence on the association between C. difficile ribotype and severe disease. We then validated this influence using an independent data set.

RESULTS

A total of 34 severe CDI cases were identified among 310 independent cases of disease (11.0%). Eleven covariates, including C. difficile ribotype, were significant predictors of severe CDI in unadjusted analysis. However, the association between ribotypes 027 and 078 and severe CDI was not significant after adjustment for any of the other covariates. After full adjustment, severe cases were significantly predicted only by patients' white blood cell count and albumin level. This result was supported by analysis of a validation data set containing 433 independent CDI cases (45 severe cases; 10.4%).

CONCLUSIONS

Ribotype is not a significant predictor of severe CDI when adjusted for the influence of any other variables separately or in combination. White blood cell count and albumin level are the most clinically relevant predictors of severe CDI cases.

Vancomycin-resistant enterococcal colonization and infection in liver transplant candidates and recipients: a prospective surveillance study

BACKGROUND

Vancomycin-resistant enterococcal (VRE) infections cause significant morbidity and mortality among patients undergoing liver transplantation. We performed a prospective study among patients awaiting transplantation to assess rates, risk factors, and outcomes associated with VRE colonization before and after transplantation.

METHODS

All adults on the transplantation waiting list from 2000-2003 were eligible. Demographic, historical, and laboratory data, as well as stool samples to be analyzed for VRE, were collected at enrollment and every 4-6 months thereafter until transplantation. After transplantation, samples were obtained every 3 days during hospitalization and were analyzed for VRE; outcomes were assessed at 90 days.

RESULTS

Overall, 375 patients were enrolled in our study, and 142 received transplants. VRE colonization occurred in 50 (13%) of 375 patients before transplantation and was independently associated with treatment with antianaerobic antimicrobials, third-generation cephalosporins, proton pump inhibitors, or neomycin; having a recent endoscopic retrograde cholangiopancreatogram or paracentesis procedure; and admission to the liver unit. Of these 50 patients, 22 (44%) received a transplant, and 7 (32%) of 22 developed a VRE infection after transplantation. An additional 22 patients (18%) who were not colonized before transplantation acquired VRE after transplantation; VRE infection developed in 5 (23%) of these patients. Patients colonized with VRE either before or after transplantation had longer stays in the intensive care unit and the hospital. Mortality at 90 days was significantly greater among those who acquired VRE after transplantation (5 [23%] of 22), compared with those who had VRE colonization before transplantation (2 [9%] of 22).

CONCLUSIONS

Liver transplantation candidates with VRE colonization before transplantation experience greater morbidity but not greater mortality, compared with noncolonized candidates. Transplant recipients who acquire VRE after transplantation have a higher mortality rate than noncolonized recipients. Strategies should be implemented to reduce nosocomial VRE acquisition after transplantation among this vulnerable group.

Nosocomial infections in left ventricular assist device recipients

Infection remains a serious complication of left ventricular assist device (LVAD) implantation. We performed a cohort study to assess infections among patients who underwent LVAD implantation from October 1996 through May 1999. Thirty-six LVADs were implanted in 35 patients; the mean duration (+/- standard deviation) of LVAD use was 73+/-60 days (total for all patients, 2565 days). Sixteen patients developed surgical site infections (SSIs; rate, 6.2 infections per 1000 LVAD days); 9 were deep-tissue or organ/space infections and 7 were superficial. Other infections included 7 cases of pneumonia (rate, 2.7 cases per 1000 LVAD days), 6 venous infections (rate, 2.3 per 1000 LVAD days), 2 bloodstream infections (rate, cases 0.8 per 1000 LVAD days), 3 urinary tract infections, and 2 skin and soft-tissue infections. Deep SSIs were associated with the requirement for postoperative hemodialysis (P=.02). Overall use of antibiotics was extensive, and a trend toward infection with antibiotic-resistant organisms was noted. Infections were a frequent complication of LVAD implantation. Further studies of interventions for preventing infection in LVAD recipients are warranted.

Poor functional status as a risk factor for severe Clostridium difficile infection in hospitalized older adults

OBJECTIVES

To determine the role of impaired functional status as a risk factor for severe Clostridium difficile infection (CDI) in older adults.

DESIGN

Prospective cohort study.

SETTING

University of Michigan Health System, a 930-bed tertiary care hospital.

PARTICIPANTS

Hospitalized individuals with CDI aged 50 and older.

MEASUREMENTS

Demographic and clinical characteristics and a composite outcome, CDI severity score: fever (>38°C), acute organ dysfunction, white blood cell count greater than 15,000/μL, lack of response to therapy, intensive care unit admission, need for colectomy, or death from CDI. Preadmission functional status was assessed according to ability to perform activities of daily living (ADLs); participants were assigned to an ADL class (independent, some assistance, full assistance). Secondary outcomes included length of stay, 90-day mortality and readmission, and CDI recurrence.

RESULTS

Ninety hospitalized individuals with CDI were identified (mean age 66.6 ± 10.2); 58 (64.4%) had severe CDI as measured according to a positive severity score. At baseline, 25 (27.8%) required assistance with ADLs. On univariate analysis, ADL class of full assistance was associated with a positive severity score (odds ratio (OR) = 7, 95% confidence interval (CI) = 1.83-26.79, P = .004). In a multivariable model including age, ADL class, congestive heart failure, diabetes mellitus, depression, weighted Charlson-Deyo comorbidity score, immunosuppression, prior CDI, and proton pump inhibitor use, an ADL class of full assistance retained its association with a positive severity score (OR = 8.1, 95% CI = 1.24-52.95, P = .03). ADL class was not associated with secondary outcomes.

CONCLUSION

In this cohort of hospitalized older adults, impaired functional status was an independent risk factor for severe CDI.

Experiences of Everyday Ageism and the Health of Older US Adults

Importance

Major incidents of ageism have been shown to be associated with poorer health and well-being among older adults. Less is known about routine types of age-based discrimination, prejudice, and stereotyping that older adults encounter in their day-to-day lives, known as everyday ageism.

Objective

To examine the prevalence of everyday ageism, group differences and disparities, and associations of everyday ageism with indicators of poor physical and mental health.

Design, Setting, and Participants

This cross-sectional study was conducted using survey data from the December 2019 National Poll on Healthy Aging among a nationally representative household sample of US adults ages 50 to 80 years. Data were analyzed from November 2021 through April 2022.

Exposures

Experiences of everyday ageism were measured using the newly developed multidimensional Everyday Ageism Scale.

Main Outcomes and Measures

Fair or poor physical health, number of chronic health conditions, fair or poor mental health, and depressive symptoms.

Results

Among 2035 adults ages 50 to 80 years (1047 [54.2%] women; 192 Black [10.9%], 178 Hispanic [11.4%], and 1546 White [71.1%]; mean [SD] age, 62.6 [8.0] years [weighted statistics]), most participants (1915 adults [93.4%]) reported regularly experiencing 1 or more forms of everyday ageism. Internalized ageism was reported by 1664 adults (81.2%), ageist messages by 1394 adults (65.2%), and interpersonal ageism by 941 adults (44.9%). Mean Everyday Ageism Scale scores were higher for several sociodemographic groups, including adults ages 65 to 80 years vs those ages 50 to 64 years (11.23 [95% CI, 10.80-11.66] vs 9.55 [95% CI, 9.26-9.84]) and White (10.43 [95% CI, 10.20-10.67]; P < .001) and Hispanic (10.09 [95% CI, 9.31-10.86]; P = .04) adults vs Black adults (9.23 [95% CI, 8.42-10.03]). Higher levels of everyday ageism were associated with increased risk of all 4 negative physical and mental health outcomes examined in regression analyses (with odds ratios [ORs] per additional scale point as high as 1.20 [95% CI, 1.17-1.23] for depressive symptoms and b = 0.039 [95% CI, 0.029-0.048] for chronic health conditions; P values < .001). Internalized ageism was the category associated with the greatest increase in risk of poor outcomes for all health measures (with ORs per additional scale point as high as 1.62 [95% CI, 1.49-1.76] for depressive symptoms and b = 0.063 [95% CI, 0.034-0.092] for chronic health conditions; P values < .001).

Conclusions and Relevance

This study found everyday ageism to be prevalent among US adults ages 50 to 80 years. These findings suggest that commonplace ageist messages, interactions, and beliefs may be harmful to health and that multilevel and multisector efforts may be required to reduce everyday ageism and promote positive beliefs, practices, and policies related to aging and older adults.

The epidemiology of acute organ system dysfunction from severe sepsis outside of the intensive care unit

BACKGROUND

Severe sepsis is a common, costly, and complex problem, the epidemiology of which has only been well studied in the intensive care unit (ICU). However, nearly half of all patients with severe sepsis are cared for outside the ICU.

OBJECTIVE

To determine rates of infection and organ system dysfunction in patients with severe sepsis admitted to non-ICU services.

DESIGN

Retrospective cohort study.

SETTING

A large, tertiary, academic medical center in the United States.

PATIENTS

Adult patients initially admitted to non-ICU medical services from 2009 through 2010.

MEASUREMENTS

All International Classification of Diseases, 9th Revision, Clinical Modification diagnosis codes were screened for severe sepsis. Three hospitalists reviewed a sample of medical records evaluating the characteristics of severe sepsis.

RESULTS

Of 23,288 hospitalizations, 14% screened positive for severe sepsis. A sample of 111 cases was manually reviewed, identifying 64 cases of severe sepsis. The mean age of patients with severe sepsis was 63 years, and 39% were immunosuppressed prior to presentation. The most common site of infection was the urinary tract (41%). The most common organ system dysfunctions were cardiovascular (hypotension) and renal dysfunction occurring in 66% and 64% of patients, respectively. An increase in the number of organ systems affected was associated with an increase in mortality and eventual ICU utilization. Severe sepsis was documented by the treating clinicians in 47% of cases.

CONCLUSIONS

Severe sepsis was commonly found and poorly documented on the wards at our medical center. The epidemiology and organ dysfunctions among patients with severe sepsis appear to be different from previously described ICU severe sepsis populations.

Prevalence of Immunosuppressive Drug Use Among Commercially Insured US Adults, 2018-2019

This cross-sectional study uses direct pharmaceutical claims data from a commercial claims database to assess the use of 6 types of immunosuppressive drugs among commercially insured US adults in 2018 and 2019.

Outbreak of sternal surgical site infections due to Pseudomonas aeruginosa traced to a scrub nurse with onychomycosis

From 19 February 1999 through 31 October 1999, 16 (8.6%) of 185 patients who underwent median sternotomy developed infections with Pseudomonas aeruginosa. Seven patients had mediastinitis, 5 had deep sternal wound infection, 2 had superficial sternal wound infection, 1 had prosthetic valve endocarditis, and 1 had sepsis. Pulsed-field gel electrophoresis confirmed that all 13 isolates that were available for typing were the same strain. Cultures of hand specimens identified 1 nurse from whom the same strain of P. aeruginosa was repeatedly isolated; the nurse had been in contact with all 16 infected patients. Investigation revealed that the nurse had severe onycholysis and onychomycosis of the right thumbnail. Cultures of samples of this nail's subungual region and of multiple cosmetic products from the nurse's home yielded the identical P. aeruginosa strain. This outbreak of surgical site infections due to P. aeruginosa was caused by wound contamination from the thumbnail of this nurse, despite her appropriate use of latex surgical gloves.

Food insecurity is associated with multiple chronic conditions and physical health status among older US adults

In the past two decades, food insecurity has increased by 45% among older adults but its relationship to health outcomes has not been extensively studied. The objective of this study was to examine the associations between food insecurity, multiple chronic conditions, and self-reported health status among a nationally representative sample of older U.S. adults. Data came from the National Poll on Healthy Aging, a national cross-sectional survey conducted in December 2019 among 2,048 individuals aged 50–80 years. Food insecurity was assessed using the six-item short form of the USDA Food Security Survey Module. The primary outcomes of interest were the number of self-reported chronic conditions and self-reported physical health status. Multinomial logistic regression models were used to examine the associations between food security status and the outcomes of interest, adjusting for sociodemographic characteristics. The overall prevalence of food insecurity among older adults was 14%. After adjustment for sociodemographic characteristics, food insecurity was positively associated with multiple chronic conditions (RRR 1.60, 95% CI 1.08, 2.36, for 2–3 conditions vs. 0–1; RRR 2.59, 95% CI 1.55, 4.33 for 4–10 chronic conditions vs. 0–1). Food insecurity was also associated with lower self-reported health status (RRR 1.84, 95% CI 1.16, 2.93 for good vs. excellent/ very good health; RRR 5.13, 95% CI 3.08, 8.52 for fair/poor vs. excellent/very good health). Food insecurity is an important social determinant of health among older adults. These findings can contribute to clinical and public health efforts to simultaneously alleviate food insecurity and promote health behaviors among older adults.