Excessive antibiotic use for acute respiratory infections in the United States

Strengths and weaknesses of FDA-approved/cleared diagnostic devices for the molecular detection of respiratory pathogens

The rapid, sensitive, and specific identification of the microbial etiological characteristics of respiratory tract infections enhances the appropriate use of both antibiotics and antiviral agents and reduces the risk of nosocomial transmission. This article reviews the current nucleic acid amplification tests approved by the U.S. Food and Drug Administration (FDA) for the detection of respiratory pathogens. In addition, Emergency Use Authorization tests for the detection of 2009 influenza A H1N1 are discussed. The advantages and limitations of the current FDA-approved/cleared tests are reviewed.

Viral agents causing lower respiratory tract infections in hospitalized children: evaluation of the Speed-Oligo® RSV assay for the detection of respiratory syncytial virus

Respiratory syncytial virus (RSV) is the viral agent which is more frequently involved in lower respiratory tract infections (LRTIs) in infants under 1 year of age in developed countries. A new oligochromatographic assay, Speed-Oligo® RSV, was designed and optimized for the specific detection and identification of RSV subtypes A and B. The test was evaluated in 289 clinical samples from 169 hospitalized children using an immunochromatography (IC) test, virus isolation by culture, and an in-house real-time polymerase chain reaction (RT-PCR). Other viruses causing LRTIs were investigated by cell culture or PCR-based tests. Sixty-two patients were infected by RSV (36.7%). In addition, adenovirus, influenza B, parainfluenza 2, and human metapneumovirus were detected in rates ranging from 5 to 8%. A proportion of 10.1% of the patients had mixed infections. The sensitivity, specificity, and positive and negative predictive values were, respectively, 94.9, 99.4, 98.9, and 97.4% for Speed-Oligo® RSV, 92.9, 96.3, 92.9, and 96.3% for RT-PCR/RSV, and 58.4, 98.1, 93.3, and 82.6% for IC. Our rates of viral detection and co-infection were similar to those of previously reported series. Finally, we find that Speed-Oligo® RSV is a rapid and easy-to-perform technique for the detection of RSV and the identification of subtypes A and B.

ENT problems in Dutch children: trends in incidence rates, antibiotic prescribing and referrals 2002-2008

BACKGROUND. Ear, nose, and throat (ENT) problems are common in childhood and are important reasons to visit the general practitioner. OBJECTIVE. To examine trends in incidence rates, antibiotic prescribing, and referrals of five common ENT problems in children. DESIGN. Netherlands Information Network of General Practice (LINH), a nationally representative general practice database. Setting. A total of 50 000 children, aged 0-17 years, registered in Dutch general practice over the period 2002-2008. METHODS. Incidence rates were calculated and trends were analysed using linear regression analysis, with incidence rates per age group, proportion treated with antibiotics, and referrals as dependent variables and year of observation as independent variable. RESULTS. In general, incidence rates of acute otitis media, serous otitis, sinusitis, tonsillitis, and tonsil hypertrophy remained stable over the period 2002-2008. An increasing trend was observed for serous otitis media in children aged 0-4 years (RR = 1.04, p < 0.001). A decreasing trend was observed for sinusitis in children aged 5-11 and for tonsillitis in children aged 11-17 years (RR 0.99, p < 0.001 and RR 0.94, p < 0.001, respectively). Antibiotics were prescribed in 10-60% of the diagnoses. An increasing trend for antibiotic prescription was found for acute otitis media (beta = 0.07, p < 0.001), mainly on account of amoxicillin. Although antibiotic treatment of tonsillitis remained stable, pheneticillin prescriptions showed a downward trend (beta = -0.10, p < 0.001). First-choice antibiotics were prescribed in >80% of cases. CONCLUSIONS. This study showed remarkably stable trends in incidence rates, antibiotic prescribing, and referrals of common ENT problems. The low proportion of antibiotic treatment in ENT problems did not show negative consequences.

Access to a polymerase chain reaction assay method targeting 13 respiratory viruses can reduce antibiotics: a randomised, controlled trial

BACKGROUND

Viral respiratory infections are common worldwide and range from completely benign disease to life-threatening illness. Symptoms can be unspecific, and an etiologic diagnosis is rarely established because of a lack of suitable diagnostic tools. Improper use of antibiotics is common in this setting, which is detrimental in light of the development of bacterial resistance. It has been suggested that the use of diagnostic tests could reduce antibiotic prescription rates. The objective of this study was to evaluate whether access to a multiplex polymerase chain reaction (PCR) assay panel for etiologic diagnosis of acute respiratory tract infections (ARTIs) would have an impact on antibiotic prescription rate in primary care clinical settings.

METHODS

Adult patients with symptoms of ARTI were prospectively included. Nasopharyngeal and throat swabs were analysed by using a multiplex real-time PCR method targeting thirteen viruses and two bacteria. Patients were recruited at 12 outpatient units from October 2006 through April 2009, and samples were collected on the day of inclusion (initial visit) and after 10 days (follow-up visit). Patients were randomised in an open-label treatment protocol to receive a rapid or delayed result (on the following day or after eight to twelve days). The primary outcome measure was the antibiotic prescription rate at the initial visit, and the secondary outcome was the total antibiotic prescription rate during the study period.

RESULTS

A total sample of 447 patients was randomised. Forty-one were excluded, leaving 406 patients for analysis. In the group of patients randomised for a rapid result, 4.5% (9 of 202) of patients received antibiotics at the initial visit, compared to 12.3% (25 of 204) (P = 0.005) of patients in the delayed result group. At follow-up, there was no significant difference between the groups: 13.9% (28 of 202) in the rapid result group and 17.2% (35 of 204) in the delayed result group (P = 0.359), respectively.

CONCLUSIONS

Access to a rapid method for etiologic diagnosis of ARTIs may reduce antibiotic prescription rates at the initial visit in an outpatient setting. To sustain this effect, however, it seems necessary to better define how to follow and manage the patient according to the result of the test, which warrants further investigation.

Are physicians with better clinical skills on licensing examinations less likely to prescribe antibiotics for viral respiratory infections in ambulatory care settings?

BACKGROUND

Viral respiratory infections (VRIs) are a common reason for ambulatory visits, and 35% are treated with an antibiotic. Antibiotic use for VRIs is not recommended, and it promotes antibiotic resistance. Effective patient-physician communication is critical to address this problem. Recognizing the importance of physician communication skills, licensure examinations were reformed in the United States and Canada to evaluate these skills.

OBJECTIVE

To assess whether physician clinical and communication skills, as measured by the Canadian clinical skills examination (CSE), predict antibiotic prescribing for VRI in ambulatory care.

RESEARCH DESIGN AND SUBJECTS

A total of 442 Quebec general practitioners and pediatricians who wrote the CSE in 1993-1996 were followed from 1993 to 2007, and their 159,456 VRI visits were identified from physician claims.

MEASURES

The outcome was an antibiotic prescription from a study physician dispensed within 7 days of the VRI visit. Multivariate logistic regression analyses were used to estimate the association between antibiotic prescribing for VRI and CSE score, adjusting for physician, patient, and encounter characteristics.

RESULTS

Better clinical and communication skills were associated with a reduction in the risk of antibiotic prescribing, but only for female physicians. Every 1-standard deviation increase in CSE score was associated with a 19% reduction in the risk of antibiotic prescribing (risk ratio, 0.81; 95% confidence interval, 0.68-0.97). Better clinical skills were associated with an even greater reduction in risk among female physicians with higher workloads (risk ratio, 0.48; 95% confidence interval, 0.29-0.79).

CONCLUSION

Physician clinical and communication skills are important determinants of antibiotic prescribing for VRI and should be targeted by future interventions.

Improving care of upper respiratory infections among Latino Early Head Start parents

Misconceptions about upper respiratory infections (URI) and their treatment are widely held, especially among Latino parents, and are associated with increased health care visits. The Centers for Disease Control and Prevention recommends community based interventions to educate families about URI. We designed a community-based, culturally competent health literacy intervention regarding URI, which was pilot tested with Latino Early Head Start (EHS) parents. In depth interviews were conducted to understand parents' perceptions. A paired-sample Wilcoxon signed rank test was used to assess change in pre-post knowledge/attitudes scores. Changes in care practices are described. Parents were very positive about this education, were open to non-antibiotic URI care, and reported that materials were helpful. Following the intervention, the mean composite knowledge/attitude score increased from 4.1 (total: 10) to 6.6 (P < .05). Families also reported improved care practices. EHS sites are promising locations for health literacy interventions regarding URI.

General principles of antimicrobial therapy

Antimicrobial agents are some of the most widely, and often injudiciously, used therapeutic drugs worldwide. Important considerations when prescribing antimicrobial therapy include obtaining an accurate diagnosis of infection; understanding the difference between empiric and definitive therapy; identifying opportunities to switch to narrow-spectrum, cost-effective oral agents for the shortest duration necessary; understanding drug characteristics that are peculiar to antimicrobial agents (such as pharmacodynamics and efficacy at the site of infection); accounting for host characteristics that influence antimicrobial activity; and in turn, recognizing the adverse effects of antimicrobial agents on the host. It is also important to understand the importance of antimicrobial stewardship, to know when to consult infectious disease specialists for guidance, and to be able to identify situations when antimicrobial therapy is not needed. By following these general principles, all practicing physicians should be able to use antimicrobial agents in a responsible manner that benefits both the individual patient and the community.

The human rhinovirus: human-pathological impact, mechanisms of antirhinoviral agents, and strategies for their discovery

As the major etiological agent of the common cold, human rhinoviruses (HRV) cause millions of lost working and school days annually. Moreover, clinical studies proved an association between harmless upper respiratory tract infections and more severe diseases e.g. sinusitis, asthma, and chronic obstructive pulmonary disease. Both the medicinal and socio-economic impact of HRV infections and the lack of antiviral drugs substantiate the need for intensive antiviral research. A common structural feature of the approximately 100 HRV serotypes is the icosahedrally shaped capsid formed by 60 identical copies of viral capsid proteins VP1-4. The capsid protects the single-stranded, positive sense RNA genome of about 7,400 bases in length. Both structural as well as nonstructural proteins produced during the viral life cycle have been identified as potential targets for blocking viral replication at the step of attachment, entry, uncoating, RNA and protein synthesis by synthetic or natural compounds. Moreover, interferon and phytoceuticals were shown to protect host cells. Most of the known inhibitors of HRV replication were discovered as a result of empirical or semi-empirical screening in cell culture. Structure-activity relationship studies are used for hit optimization and lead structure discovery. The increasing structural insight and molecular understanding of viral proteins on the one hand and the advent of innovative computer-assisted technologies on the other hand have facilitated a rationalized access for the discovery of small chemical entities with antirhinoviral (anti-HRV) activity. This review will (i) summarize existing structural knowledge about HRV, (ii) focus on mechanisms of anti-HRV agents from synthetic and natural origin, and (iii) demonstrate strategies for efficient lead structure discovery.

Otitis media across nine countries: disease burden and management

OBJECTIVE

To assess the perceived disease burden and management of otitis media (OM) among an international cohort of experienced physicians.

METHODS

A cross-sectional survey conducted in France, Germany, Spain, Poland, Argentina, Mexico, South Korea, Thailand and Saudi Arabia. Face-to-face interviews conducted with 1800 physicians (95% paediatricians, 5% family practitioners).Main outcome measures were the perceived burden on clinical practice (number of cases, complications and referrals) and first- and second-line management strategies for OM. Results are expressed as mean and range across the nine countries over three continents.

RESULTS

Respondents estimated an average annual caseload of 375 (range 128-1003) children under 5 years of age with OM; 54% (range 44-71%) with an initial episode and 38% (range 27-54%) with recurrent OM (ROM). OM with complications was estimated to be approximately 20 (range 7-49) cases per year and an estimated 15% (8-41%) of children with OM was recalled as needing specialist referral. There was high awareness of Streptococcus pneumoniae and Haemophilus influenzae as causative bacterial pathogens: 77% (range 65-91%) and 74% (range 68-83%), respectively, but less recognition of non-typeable H. influenzae (NTHi); 59% (range 45-67%). Although concern over antimicrobial resistance was widespread, empirical treatment with antibiotics was the most common first-line treatment (mean 81%, range 40-96%). The burden of disease is substantial enough that many physicians would consider vaccination to prevent OM (mean score 5.1, range 4.3-6.2 on 1-7 scale).

CONCLUSIONS

This large, multinational survey shows that OM remains a significant burden for clinical practice. Despite awareness of shortcomings, antimicrobial therapy remains the most frequent treatment for OM.

Reducing inappropriate antibiotics prescribing: the role of online commentary on physical examination findings

OBJECTIVE

This study investigates the relationship of 'online commentary' (contemporaneous physician comments about physical examination [PE] findings) with (i) parent questioning of the treatment recommendation and (ii) inappropriate antibiotic prescribing.

METHODS

A nested cross-sectional study of 522 encounters motivated by upper respiratory symptoms in 27 California pediatric practices (38 pediatricians). Physicians completed a post-visit survey regarding physical examination findings, diagnosis, treatment, and whether they perceived the parent as expecting an antibiotic. Taped encounters were coded for 'problem' online commentary (PE findings discussed as significant or clearly abnormal) and 'no problem' online commentary (PE findings discussed reassuringly as normal or insignificant).

RESULTS

Online commentary during the PE occurred in 71% of visits with viral diagnoses (n=261). Compared to similar cases with 'no problem' online commentary, 'problem' comments were associated with a 13% greater probability of parents questioning a non-antibiotic treatment plan (95% CI 0-26%, p=.05,) and a 27% (95% CI: 2-52%, p<.05) greater probability of an inappropriate antibiotic prescription.

CONCLUSION

With viral illnesses, problematic online comments are associated with more pediatrician-parent conflict over non-antibiotic treatment recommendations. This may increase inappropriate antibiotic prescribing.

PRACTICE IMPLICATIONS

In viral cases, physicians should consider avoiding the use of problematic online commentary.

Impact of a computerized template on antibiotic prescribing for acute respiratory infections in children and adolescents

BACKGROUND

Computerized decision support (CDS) can potentially improve patient safety and guideline adherence. The authors developed an acute respiratory illness interactive template (ARI-IT) within an electronic health record (EHR) to manage pediatric ARIs and assessed the impact on antibiotic prescribing.

METHODS

They randomized 12 practices either to receive the ARI-IT or to the control group. Antibiotic rates among all eligible ARI diagnoses were compared among control and intervention ARI visits, controlling for clustering by clinician.

RESULTS

There was no difference in total antibiotic prescriptions between control and intervention clinics. Use of the ARI-IT significantly reduced antibiotic prescriptions (31.7% vs 39.9%; P = .02) and use of macrolides (6.2% vs 9.5%; P = .02) among visits compared with those eligible visits where it was not used.

CONCLUSION

Use of the CDS reduced antibiotic prescribing and macrolide prescriptions among children with an ARI. Nonetheless, the low overall use resulted in an ineffective intervention.

Colonization of healthy children by Moraxella catarrhalis is characterized by genotype heterogeneity, virulence gene diversity and co-colonization with Haemophilus influenzae

The colonization dynamics of Moraxella catarrhalis were studied in a population comprising 1079 healthy children living in Rotterdam, The Netherlands (the Generation R Focus cohort). A total of 2751 nasal swabs were obtained during four clinic visits timed to take place at 1.5, 6, 14 and 24 months of age, yielding a total of 709 M. catarrhalis and 621 Haemophilus influenzae isolates. Between January 2004 and December 2006, approximate but regular 6-monthly cycles of colonization were observed, with peak colonization incidences occurring in the autumn/winter for M. catarrhalis, and winter/spring for H. influenzae. Co-colonization was significantly more likely than single-species colonization with either M. catarrhalis or H. influenzae, with genotypic analysis revealing no clonality for co-colonizing or single colonizers of either bacterial species. This finding is especially relevant considering the recent discovery of the importance of H. influenzae-M. catarrhalis quorum sensing in biofilm formation and host clearance. Bacterial genotype heterogeneity was maintained over the 3-year period of the study, even within this relatively localized geographical region, and there was no association of genotypes with either season or year of isolation. Furthermore, chronological and genotypic diversity in three immunologically important M. catarrhalis virulence genes (uspA1, uspA2 and hag/mid) was also observed. This study indicates that genotypic variation is a key factor contributing to the success of M. catarrhalis colonization of healthy children in the first years of life. Furthermore, variation in immunologically relevant virulence genes within colonizing populations, and even within genotypically identical M. catarrhalis isolates, may be a result of immune evasion by this pathogen. Finally, the factors facilitating M. catarrhalis and H. influenzae co-colonization need to be further investigated.

Molecular diagnosis of respiratory viruses

Respiratory tract viral infections are responsible for an incredible amount of morbidity and mortality throughout the world. Older diagnostic methods, such as tissue culture and serology, have been replaced with more advanced molecular techniques, such as PCR and reverse-transcriptase PCR, nucleic acid sequence-based amplification and loop-mediated isothermal amplification. These techniques are faster, have greater sensitivity and specificity, and are becoming increasingly accessible. In the minds of most, PCR has replaced tissue culture and serology as the gold standard for detection of respiratory viruses owing to its speed, availability and versatility. PCR/reverse-transcriptase PCR has been used in a variety of detection platforms, in multiplex assays (detecting multiple pathogens simultaneously) and in automated systems (sample in-answer out devices). Molecular detection has many proven advantages over standard virological methods and will further separate itself through increased multiplexing, processing speed and automation. However, tissue culture remains an important method for detecting novel viral mutations within a virus population, for detecting novel viruses and for phenotypic characterization of viral isolates.

Ambulatory antibiotic use and prescription drug coverage in older adults

BACKGROUND

Several studies have shown that use of medications to treat chronic conditions is highly sensitive to out-of-pocket price and influenced by changes in insurance coverage. Because antibiotics target infections and are used for a short period, one may expect antibiotic use to be less responsive to price. However, no studies have evaluated how antibiotic use changes with drug coverage. We evaluate changes in ambulatory oral antibiotic use after implementation of the Medicare drug benefit (Part D).

METHODS

We conducted a comparison group analysis 2 years before and after implementation of Part D using insurance claims data from a large Medicare Advantage plan (January 1, 2004, through December 31, 2007). Outcomes included the likelihood of using any oral antibiotics and major antibiotic subclasses among 35 102 older adults and rates of antibiotic use among those with pneumonia and other acute respiratory tract infections.

RESULTS

Overall antibiotic use increased most among those who did not previously have drug coverage (relative odds ratio [OR], 1.58; 95% confidence interval [CI], 1.36-1.85). Use of the broad spectrum antibiotic subclasses of quinolones (OR, 1.70; 95% CI, 1.35-2.15) and macrolides (1.59; 1.26-2.01) increased more than the use of other subclasses, especially for those with prior drug coverage. Rates of ambulatory antibiotic use associated with pneumonia increased (OR, 3.60; 95% CI, 2.35-5.53) more than those associated with other acute respiratory tract infections (2.29; 1.85-2.83).

CONCLUSIONS

Antibiotic use increased among older adults whose drug coverage improved after Part D implementation, with the largest increases for broad spectrum, newer, and more expensive antibiotics. Our study suggests reimbursement may play a role in addressing inappropriate antibiotic use.

Novel conserved group A streptococcal proteins identified by the antigenome technology as vaccine candidates for a non-M protein-based vaccine

Group A streptococci (GAS) can cause a wide variety of human infections ranging from asymptomatic colonization to life-threatening invasive diseases. Although antibiotic treatment is very effective, when left untreated, Streptococcus pyogenes infections can lead to poststreptococcal sequelae and severe disease causing significant morbidity and mortality worldwide. To aid the development of a non-M protein-based prophylactic vaccine for the prevention of group A streptococcal infections, we identified novel immunogenic proteins using genomic surface display libraries and human serum antibodies from donors exposed to or infected by S. pyogenes. Vaccine candidate antigens were further selected based on animal protection in murine lethal-sepsis models with intranasal or intravenous challenge with two different M serotype strains. The nine protective antigens identified are highly conserved; eight of them show more than 97% sequence identity in 13 published genomes as well as in approximately 50 clinical isolates tested. Since the functions of the selected vaccine candidates are largely unknown, we generated deletion mutants for three of the protective antigens and observed that deletion of the gene encoding Spy1536 drastically reduced binding of GAS cells to host extracellular matrix proteins, due to reduced surface expression of GAS proteins such as Spy0269 and M protein. The protective, highly conserved antigens identified in this study are promising candidates for the development of an M-type-independent, protein-based vaccine to prevent infection by S. pyogenes.

Group A streptococcal pharyngitis and immune-mediated complications: from diagnosis to management

Group A streptococcal pharyngitis remains the most important bacterial pharyngitis because of its frequency and potential complications. Group A streptococcal pharyngitis is most common in children 5-11 years of age in winter-spring, and a rapid test or culture is necessary for accurate diagnosis. We propose a management strategy for those geographic areas with very low acute rheumatic fever rates, emphasizing selective testing that avoids testing those patients with viral-like features (e.g., rhinorrhea and cough). Acute rheumatic fever is the most important immune-mediated sequela and has become rare in most areas of the USA and Western Europe, most probably due to decreased circulation of highly rheumatogenic group A streptococcal strains.

Antibiotic prescription pattern for viral respiratory illness in emergency room and ambulatory care settings

OBJECTIVE

To evaluate the current practice pattern of antibiotic prescription rate in viral respiratory tract infection diagnosed children among different specialty health care providers.

METHODS

The study was a retrospective case review study where a random sample of 1200 child care visits coded as viral respiratory infections in primary care provider's office, convenient care clinic, or emergency room in 2006 were analyzed.

RESULTS

Overall, the antibiotic prescription rate was 30%. The prescription rate was 3.7 times (95% confidence interval [CI] = 1.90-7.31) higher for bronchitis patients and 2.5 times (95% CI = 1.46-4.30) higher for viral pharyngitis patients than for common cold patients. Antibiotics were written more by emergency physicians (odds ratio [OR] = 11.04; 95% CI = 5.78-21.10) and family practitioners (OR = 5.22; 95% CI = 2.99-9.10) than by pediatricians.

CONCLUSION

Although not recommended, children seen in the emergency room and family practitioner's office are more likely to receive antibiotic prescriptions than those seen in the pediatrician's office.

Future directions in treating cough

Cough is a common and troublesome symptom that can be difficult to treat. New therapeutic options that are safe and more effective than those currently available are needed. In this article, the authors offer opinion on future directions in the treatment of cough, with a particular emphasis on the clinical syndrome associated with cough reflex hypersensitivity. In addition, the article provides an overview of some of the diagnostic technologies and promising drug targets likely to emerge from current clinical and scientific endeavor.

Animated video vs pamphlet: comparing the success of educating parents about proper antibiotic use

OBJECTIVE

The objective was to create an animated video to teach parents about the appropriate use of antibiotics and to compare their knowledge to parents who were provided with the American Academy of Pediatrics pamphlet. We hypothesized that the video format would result in improved comprehension and retention.

METHODS

This prospective randomized, controlled trial was conducted in an urban pediatric emergency department. Parent subjects were randomly assigned to a control group, a pamphlet group, and a video group and completed a survey at 3 time points. Analysis included the nonparametric matched Friedman test, Kruskal-Wallis test, and the Mann-Whitney U test. A 2-sided P value of < .05 was required for significance, and a Bonferroni-corrected P value of < .017 was required for paired comparisons.

RESULTS

Postintervention survey scores improved significantly in the pamphlet and video groups compared with baseline. The video group's follow-up scores were not significantly different from the postintervention-survey scores (P = .32). The pamphlet-group scores at follow-up were significantly lower than the postintervention-survey scores (P = .002). The control group's scores were similar at all 3 time periods. The pamphlet group had significantly better scores than the control group after the intervention (P < .001). The video-group scores exceeded the control-group scores at all 3 time periods.

CONCLUSIONS

An animated video is highly effective for educating parents about the appropriate use of antibiotics in the emergency department setting and results in long-term knowledge retention. The results of this study provide a foundation to further evaluate the use of animated video in additional populations.

Physician champions are key to improving antibiotic prescribing quality

BACKGROUND

The previously reported IMPAACT study was a cluster randomized controlled trial of a patient and physician educational intervention designed to reduce antibiotic prescribing for acute respiratory tract infections (ARIs) in emergency departments (EDs) in the United States. On average, the intervention resulted in a modest improvement in antibiotic prescribing behavior at the end of Year 1 and further improvement after Year 2. Yet the intervention's impact was large at some sites but minimal or even negative at others. A study was undertaken to identify organizational factors that influenced the effectiveness (Organizational Effect Modifiers [OEMs]) of the intervention.

METHODS

Focus groups of nurses and ED staff and semistructured interviews of local project leaders, nurse managers, and quality improvement (QI) officers were performed at seven EDs across the United States. Effectiveness of the local project leader, institutional emphasis on patient satisfaction ratings, and institutional history with and approach to QI were initially identified as key potential OEMs. Two investigators independently read the transcripts for each site and, using prespecified rating scales, rated the presence of each OEM.

FINDINGS

The perceived effectiveness of the local project leader was most strongly linked to the effectiveness of the intervention. Perceived institutional emphasis on patient satisfaction and institutional history of and approach to QI (top down or bottom up) did not appear to be closely linked with intervention effectiveness.

DISCUSSION

An effective local leader to serve as a physician champion was key to the success of this project. Organizational factors modify the effectiveness of QI interventions targeting individual physician performance and should be addressed during program implementation.

Impact of non-pharmaceutical interventions on URIs and influenza in crowded, urban households

OBJECTIVES

We compared the impact of three household interventions-education, education with alcohol-based hand sanitizer, and education with hand sanitizer and face masks-on incidence and secondary transmission of upper respiratory infections (URIs) and influenza, knowledge of transmission of URIs, and vaccination rates.

METHODS

A total of 509 primarily Hispanic households participated. Participants reported symptoms twice weekly, and nasal swabs were collected from those with an influenza-like illness (ILI). Households were followed for up to 19 months and home visits were made at least every two months.

RESULTS

We recorded 5034 URIs, of which 669 cases reported ILIs and 78 were laboratory-confirmed cases of influenza. Demographic factors significantly associated with infection rates included age, gender, birth location, education, and employment. The Hand Sanitizer group was significantly more likely to report that no household member had symptoms (p < 0.01), but there were no significant differences in rates of infection by intervention group in multivariate analyses. Knowledge improved significantly more in the Hand Sanitizer group (p < 0.0001). The proportion of households that reported > or = 50% of members receiving influenza vaccine increased during the study (p < 0.001). Despite the fact that compliance with mask wearing was poor, mask wearing as well as increased crowding, lower education levels of caretakers, and index cases 0-5 years of age (compared with adults) were associated with significantly lower secondary transmission rates (all p < 0.02).

CONCLUSIONS

In this population, there was no detectable additional benefit of hand sanitizer or face masks over targeted education on overall rates of URIs, but mask wearing was associated with reduced secondary transmission and should be encouraged during outbreak situations. During the study period, community concern about methicillin-resistant Staphylococcus aureus was occurring, perhaps contributing to the use of hand sanitizer in the Education control group, and diluting the intervention's measurable impact.

Implementation of a Pharmacist-Led Antimicrobial Management Team in a Community Teaching Hospital

Antimicrobial stewardship is an important process proven to combat antimicrobial resistance, improve patient outcomes, and reduce costs. The Infectious Diseases Society of America (IDSA) and the Society for Healthcare Epidemiology of America (SHEA) have provided guidelines for the provision of antimicrobial stewardship. According to these recommendations, antimicrobial stewardship teams should be multidisciplinary in nature, with core members consisting of an infectious disease physician and an infectious disease–trained clinical pharmacist. Due to limited resources, our institution chose to implement a pharmacist-led antimicrobial stewardship service on 1 medical/surgical ward, with the existing clinical pharmacist and 3 infectious disease physicians as core members. This clinical pharmacist was not trained in infectious disease specialty, and stewardship activities were only one part of his daily activities. Pharmacy residents and students were extensively utilized to assist in the stewardship process. Approximately two thirds of stewardship recommendations were accepted using primarily a prospective audit and feedback approach.

Antimicrobial Stewardship in the Intensive Care Unit: A Focus on Potential Pitfalls

Patients in the intensive care unit (ICU) have many risk factors for resistant pathogens such as prolonged length of stay, frequent and broad-spectrum antimicrobial therapy, presence of foreign materials, and proximity with other patients. However, of the risk factors associated with acquisition of resistant pathogens, inappropriate use of antimicrobial agents has been the most implicated. Thus, many health care institutions have adopted antimicrobial stewardship programs (ASPs) as a mechanism to ensure more appropriate antimicrobial use. ASPs can have a significant impact in the ICU, leading to improved antimicrobial use and resistance patterns and decreased infection rates and costs, due to the inherent nature of infections encountered and high and often inappropriate antibiotic utilization in this setting. However, certain challenges exist for ASPs in the ICU including issues with infrastructure and personnel, information technology, the core ASP strategy, patient-specific factors, conversion of intravenous to oral therapy, and dose optimization. The combination of comprehensive infection control (IC) and effective antimicrobial stewardship can prevent the emergence of resistance among microorganisms and may decrease the negative consequences associated with antimicrobial misuse.

Pro/con debate: Should antimicrobial stewardship programs be adopted universally in the intensive care unit?

You are director of a large multi-disciplinary ICU. You have recently read that hospital-wide antibiotic stewardship programs have the potential to improve the quality and safety of care, and to reduce the emergence of multi-drug resistant organisms and overall costs. You are considering starting one of these programs in your ICU, but are concerned about the associated infrastructure costs. You are debating whether it is worth bringing the concept forward to your hospital's administration to consider investing in.

Efficacy and safety of intranasal xylometazoline and ipratropium in patients with common cold

BACKGROUND

Many over-the-counter medications are available to treat common cold nasal symptoms, but patients may be unsure which one to use.

METHODS

This review assesses two widely used intranasal treatments for nasal congestion and rhinorrhea in the common cold: xylometazoline hydrochloride and ipratropium bromide.

RESULTS

Xylometazoline quickly and effectively relieves nasal congestion, while ipratropium is effective at reducing rhinorrhea. When used in combination, a novel approach to treatment, nasal congestion and rhinorrhea are treated simultaneously, providing effective relief from two of the most troublesome symptoms of the common cold Both drugs are well tolerated, with only mild to moderate, nasal-related side effects.

CONCLUSIONS

The efficacy and safety of the combination product suggest that it should be used first-line in the symptomatic relief of nasal congestion and rhinorrhea, before the use of oral treatments.

Multicenter study of cigarette smoking among patients presenting to the emergency department with acute asthma

BACKGROUND

Many studies have focused on smoking and chronic asthma severity. However, research on the relationship between smoking and acute asthma severity in an acute care setting is sparse.

OBJECTIVES

To determine the smoking prevalence among emergency department (ED) patients with acute asthma and to investigate the relationships between smoking and acute asthma severity.

METHODS

A 63-site medical record review study of ED patients, ages 14 to 54 years, with a principal diagnosis of acute asthma was performed. Patients with chronic obstructive pulmonary disease were excluded. Measurements for acute asthma severity included sociodemographic factors, asthma medical history, ED presentation, clinical course, medications administered, and return visit within 48 hours.

RESULTS

A total of 4,052 patient medical records were reviewed. A total of 1,332 patients (33%; 95% confidence interval, 31%-34%) were documented as smokers. No statistically significant differences were found between smokers and nonsmokers in vital signs, oxygen saturation, peak expiratory flow, and administration of asthma medications. By contrast, smokers were more likely than nonsmokers to receive antibiotics in the ED (12% vs 9%, P < .001) or at discharge (23% vs 14%, P < .001). A multivariate analysis confirmed that smoking status was independently associated with antibiotic administration (odds ratio, 1.6; 95% confidence interval, 1.3-1.8).

CONCLUSIONS

One-third of ED patients with acute asthma smoked cigarettes. Smokers and nonsmokers did not differ in their acute asthma severity. Asthmatic smokers, however, were more likely to receive antibiotics, even when adjusting for other possible confounders.

Cough and viruses in airways disease: mechanisms

Acute cough is a major symptom of viral respiratory tract infection and causes excessive morbidity in human populations across the world. A wide variety of viruses play a role in the development of cough after acute infection and all of these manifest a similar clinical picture across different age groups. Despite the large disease burden surprisingly little is known about the mechanism of acute cough following viral infection. Both in vitro and in vivo experiments show that increased production of neuropeptides and leukotrienes mediate cough after viral infection, along with altered expression of neural receptors. Increased airway mucus production is also likely to play a significant role. This work is reviewed in this article.

Following the recent development of a mouse model for rhinovirus infection and the establishment of experimental models of rhinovirus challenge in human subjects with both asthma and COPD the field is expanding to translate in vitro research into clinical studies and hopefully eventually into clinical practice. Developing a clearer understanding of the mechanisms underlying virus induced cough may lead to more specific and effective therapies.

Self-reported antibiotic allergy incidence and prevalence: age and sex effects

BACKGROUND

Data on the prevalence and incidence of adverse reactions to antibiotics in outpatient populations are rare. These events are commonly called "allergy" when noted in the medical record.

OBJECTIVES

Determine the prevalence and incidence of allergy, as recorded in the medical record, to the most commonly used antibiotic classes in a large outpatient population using health care in the United States during 2007.

METHODS

Data for drug allergy and antibiotic use were extracted from the electronic health records of 411,543 patients cared for by Kaiser Permanente in San Diego County who had at least one outpatient visit during 2007. Outpatient antibiotic utilization data was obtained for each year between 1995 and 2007. Penicillins, sulfas, cephalosporins, tetracyclines, macrolides, and quinolones were the classes of antibiotics evaluated.

RESULTS

Antibiotics account for a majority of drug allergy entries. Antibiotic classes with higher historical use have higher allergy prevalence. Female patients use more antibiotics than males, and have higher allergy prevalence rates for all classes of antibiotics. There is a steady increase in antibiotic allergy prevalence with aging for both sexes. Females have higher allergy incidence rates for all classes of antibiotics. Antibiotic allergy incidence in female patients is highest for sulfas, 3.4%, compared with 1%-1.5% for all other classes of antibiotics. Antibiotic allergy incidence in males also is highest for sulfas, 2.2%, compared with 1.1% for penicillins and 0.5%-0.6% for all other classes of antibiotics.

CONCLUSIONS

Female sex, use, and increasing age are the primary factors that account for higher antibiotic allergy prevalence. Antibiotic allergy incidence is highest with sulfa class antibiotics.

Emergency department visits for antibiotic-associated adverse events

BACKGROUND

Drug-related adverse events are an under-appreciated consequence of antibiotic use, and the national magnitude and scope of these events have not been studied. Our objective was to estimate and compare the numbers and rates of emergency department (ED) visits for drug-related adverse events associated with systemic antibiotics in the United States by drug class, individual drug, and event type.

METHODS

We analyzed drug-related adverse events from the National Electronic Injury Surveillance System-Cooperative Adverse Drug Event Surveillance project (2004-2006) and outpatient prescriptions from national sample surveys of ambulatory care practices, the National Ambulatory Medical Care Survey and the National Hospital Ambulatory Medical Care Survey (2004-2005).

RESULTS

On the basis of 6614 cases, an estimated 142,505 visits (95% confidence interval [CI], 116,506-168,504 visits) annually were made to US EDs for drug-related adverse events attributable to systemic antibiotics. Antibiotics were implicated in 19.3% of all ED visits for drug-related adverse events. Most ED visits for antibiotic-associated adverse events were for allergic reactions (78.7% of visits; 95% CI, 75.3%-82.1% of visits). One-half of the estimated ED visits were attributable to penicillins (36.9% of visits; 95% CI, 34.7%-39.2% of visits) and cephalosporins (12.2%; 95% CI, 10.9%-13.5%). Among commonly prescribed antibiotics, sulfonamides and clindamycin were associated with the highest rate of ED visits (18.9 ED visits per 10,000 outpatient prescription visits [95% CI, 13.1-24.7 ED visits per 10,000 outpatient prescription visits] and 18.5 ED visits per 10,000 outpatient prescription visits [95% CI, 12.1-25.0 ED visits per 10,000 outpatient prescription visits], respectively). Compared with all other antibiotic classes, sulfonamides were associated with a significantly higher rate of moderate-to-severe allergic reactions (4.3% [95% CI, 2.9%-5.8%] vs. 1.9 % [95% CI, 1.5%-2.3%]), and sulfonamides and fluoroquinolones were associated with a significantly higher rate of neurologic or psychiatric disturbances (1.4% [95% CI, 1.0%-1.7%] vs. 0.5% [95% CI, 0.4%-0.6%]).

CONCLUSIONS

Antibiotic-associated adverse events lead to many ED visits, and allergic reactions are the most common events. Minimizing unnecessary antibiotic use by even a small percentage could significantly reduce the immediate and direct risks of drug-related adverse events in individual patients.

Amoxicillin and amoxicillin plus clavulanate: a safety review

Despite the considerable number of newer antibacterials made available over the past decades, amoxicillin, alone or in combination with clavulanic acid, still accounts among the most widely used antibacterial agents. Although they are often considered 'twin drugs', they are different both in terms of antibacterial activities and of safety profile. It is well documented that the clavulanate component may cause adverse reactions by itself, thus exposing patients to further, and sometimes undue, risks. Although amoxicillin/clavulanate should be considered as an alternative agent only for the treatment of resistant bacteria, evidence shows that it is often used also when a narrow-spectrum antibiotic would have been just as effective. This prescription habit may have serious consequences in terms of patients' safety, as well as in terms of the development of bacterial resistance.

Serious Antimicrobial Resistance Status of Pathogens Causing Hospital-acquired Lower Respiratory Tract Infections in North China

Antimicrobial resistance patterns of pathogens causing hospital-acquired lower respiratory tract infections (LRTIs) in Shandong Province, China were investigated using data collected from January 2002 to December 2006. A total of 10337 isolates were characterized in sputum samples from 39 920 LRTI patients: 68.72% were Gram-negative bacteria, 20.65% were Gram-positive bacteria, and 10.62% were fungi. Organisms most frequently isolated were: Pseudomonas aeruginosa (16.88%), Klebsiella pneumoniae (10.80%), Escherichia coli (10.71%), fungi (10.62%), Staphylococcus aureus (9.68%) and Acinetobacter baumannii (9.03%). Imipenem was the most effective antibiotic against Gram-negative bacteria. Most Gram-positive bacteria were susceptible to vancomycin. Susceptibility to cephalosporins was not optimal and resistance to fluoroquinolones was high. Resistance of Gram-negative bacteria showed a rapid increase over the study period, while resistance of Gram-positive bacteria remained relatively stable. The emergence of resistance to commonly prescribed antimicrobial agents used against LRTI pathogens has compounded the problem of using empirical therapy and created selective pressure on physicians to use certain antibiotics.

Extended-spectrum beta-lactamase-producing Enterobacteriaceae in a Malian orphanage

We show high rates of extended-spectrum beta-lactamase-producing Enterobacteriaceae carriage among the staff and children at an orphanage in Bamako, Mali. Enterobacteriaceae colonized in 100% and 63%, respectively, of the 38 children and 30 adults studied. Use of antimicrobial drugs appeared excessive and inappropriate; decontamination and hygiene protocols were also questioned.

Effect of antibiotics for otitis media on mastoiditis in children: a retrospective cohort study using the United kingdom general practice research database

BACKGROUND

Information is needed on whether mastoiditis has increased in association with the decline in antibiotics prescribed to children by primary care physicians in the United Kingdom.

OBJECTIVE

To determine time trends in mastoiditis incidence, the frequency of antecedent otitis media, and the effect of antibiotics for otitis media on the risk of mastoiditis in children.

PATIENTS AND METHODS

We conducted a retrospective cohort study by using the UK General Practice Research Database. Children aged 3 months to 15 years between 1990 and 2006 were included. Risk of mastoiditis within 3 months after otitis media diagnosis and the protective effect of antibiotics were determined.

RESULTS

There were 2 622 348 children within the General Practice Research Database; 854 had mastoiditis, only one third of whom (35.7%) had antecedent otitis media. Mastoiditis incidence remained stable between 1990 and 2006 ( approximately 1.2 per 10 000 child-years). Risk of mastoiditis, after otitis media, was 1.8 per 10 000 episodes (139 of 792 623) after antibiotics compared with 3.8 per 10 000 (149 of 389 649) without antibiotics, and increased with age. Antibiotics halved the risk of mastoiditis. General practitioners would need to treat 4831 otitis media episodes with antibiotics to prevent 1 child from developing mastoiditis. If antibiotics were no longer prescribed for otitis media, an extra 255 cases of childhood mastoiditis would occur, but there would be 738 775 fewer antibiotic prescriptions per year in the United Kingdom.

CONCLUSIONS

Most children with mastoiditis have not seen their general practitioner for otitis media. Antibiotics halve the risk of mastoiditis, but the high number of episodes needing treatment to prevent 1 case precludes the treatment of otitis media as a strategy for preventing mastoiditis. Although mastoiditis is a serious disease, most children make an uncomplicated recovery after mastoidectomy or intravenous antibiotics. Treating these additional otitis media episodes could pose a larger public health problem in terms of antibiotic resistance.

Performance of a rapid antigen-detection test and throat culture in community pediatric offices: implications for management of pharyngitis

OBJECTIVES

The goals were to establish performance characteristics of a rapid antigen-detection test and blood agar plate culture performed and interpreted in community pediatric offices and to assess the effect of the pretest likelihood of group A streptococcus pharyngitis on test performance (spectrum bias).

METHODS

Two throat swabs were collected from 1848 children 3 to 18 years of age who were evaluated for acute pharyngitis between November 15, 2004, and May 15, 2005, in 6 community pediatric offices. One swab was used to perform the rapid antigen-detection test and a blood agar plate culture in the office and the other was sent to our laboratory for blood agar plate culture. Clinical findings were used to calculate the McIsaac score for each patient. The sensitivities of the office tests were calculated, with the hospital laboratory culture results as the criterion standard.

RESULTS

Thirty percent of laboratory blood agar plate cultures yielded group A streptococcus (range among sites: 21%-36%). Rapid antigen-detection test sensitivity was 70% (range: 61%-80%). Office culture sensitivity was significantly greater, 81% (range: 71%-91%). Rapid antigen-detection test specificity was 98% (range: 98%-99.5%), and office culture specificity was 97% (range: 94%-99%), a difference that was not statistically significant. The sensitivity of a combined approach using the rapid antigen-detection test and back-up office culture was 85%. Among patients with McIsaac scores of >2, rapid antigen-detection test sensitivity was 78%, office culture sensitivity was 87%, and combined approach sensitivity was 91%. Positive diagnostic test results were significantly associated with McIsaac scores of >2.

CONCLUSIONS

The sensitivity of the office culture was significantly greater than the sensitivity of the rapid antigen-detection test, but neither test was highly sensitive. The sensitivities of each diagnostic modality and the recommended combined approach were best among patients with greater pretest likelihood of group A streptococcus pharyngitis.

GPs' antibiotic prescription patterns for respiratory tract infections--still room for improvement

OBJECTIVE

Inappropriate use of antibiotics is associated with increased antibiotic resistance in the community. About 90% of all antibiotic prescriptions in Norway are issued by general practitioners and in 60% issued for respiratory tract infections. The article describes and analyses antibiotic prescription patterns by general practitioners in Vestfold, Norway.

DESIGN

Prospective cohort study.

SUBJECTS

A total of 145 list-holding general practitioners in Vestfold, Norway in February to March 2003.

METHODS

Merging of two electronic administrative data sets: antibiotic prescriptions dispensed in pharmacies and general practitioners' electronic bills from the National Insurance Agency.

MAIN OUTCOME MEASURES

Proportion and type of antibiotic prescribed for different respiratory tract infectious diagnoses.

RESULTS

We found large variations among general practitioners' antibiotic prescription habits. In 27% of consultations with RTI diagnoses, an antibiotic was prescribed; 37% were for Penicillin V and 28% for a macrolide. Quinolones and cephalosporins were only rarely prescribed. In a logistic regression analysis the following factors were independently associated with antibiotic prescription rate: type of infection, type of contact, being a general practitioner specialist, and years since medical exam. In another logistic regression analysis the following factors were independently associated with broad-spectrum antibiotic prescription: type of infection, age of patient, type of contact, being a specialist, length of list, and being a high prescriber of antibiotics.

CONCLUSION

The variation in proportion of total antibiotic prescribing and broad-spectrum prescription for respiratory tract infections is high, and reveals potentials to change general practitioners' prescription behaviour, in order to maintain the positive situation in Norway as to antibiotic resistance.

Appropriateness of antibiotic prescribing in veterans with community-acquired pneumonia, sinusitis, or acute exacerbations of chronic bronchitis: a cross-sectional study

BACKGROUND

Studies that have assessed antibiotic appropriateness in acute respiratory tract infections (RTIs) with a likely bacterial etiology have focused only on antibiotic choice and ignored other important aspects of prescribing, such as dosing, drug-drug interactions, and duration of treatment.

OBJECTIVE

The aim of this study was to determine the prevalence and predictors of inappropriate antibiotic prescribing practices in outpatients with acute bacterial RTIs (community-acquired pneumonia [CAP], sinusitis, or acute exacerbations of chronic bronchitis [AECB]).

METHODS

This retrospective, cross-sectional study enrolled outpatients with CAP, sinusitis, or AECB who were evaluated in a Veterans Affairs emergency department over a 1-year period. Using electronic medical records, trained research assistants completed data-collection forms that included patient characteristics (eg, marital status, history of alcohol abuse), diagnosis, comorbidities, concurrent medications, and antibiotics prescribed. To assess antimicrobial appropriateness, a trained clinical pharmacist reviewed the data-collection forms and applied a Medication Appropriateness Index (MAI), which rated the appropriateness of a medication using 10 criteria: indication, effectiveness, dosage, directions, practicality (defined as capability of being used or being put into practice), drug-drug interactions, drug-disease interactions, unnecessary duplication, duration, and expensiveness (defined as the cost of the drug compared with other agents of similar efficacy and tolerability). Previous studies have found good inter- and intrarater reliabilities between a clinical pharmacist's and an internal medicine physician's MAI ratings (kappa=0.83 and 0.92, respectively).

RESULTS

One hundred fifty-three patients were included (mean age, 58 years; 92% male; and 65% white). Overall, 99 of 153 patients (65%) had inappropriate antibiotic prescribing as assessed using the MAI. Expensiveness (60 patients [39%]), impracticality (32 [21%]), and incorrect dosage (15 [10%]) were the most frequently rated problem. Penicillins, quinolones, and macrolides were the most common antibiotic classes prescribed inappropriately. A history of alcohol abuse was associated with a lower likelihood of inappropriate prescribing compared with no history of alcohol abuse (adjusted odds ratio [AOR], 0.32; 95% CI, 0.10-0.98), while patients who were married were more likely to receive inappropriately prescribed antibiotics than those who were not married (AOR, 2.64; 95% CI, 1.25-5.59).

CONCLUSIONS

Inappropriate antibiotic prescribing based on the MAI criteria was common (65%) in this selected patient population with acute bacterial RTIs, and often involved problems with expensiveness (39%), impracticality (21%), and incorrect dosage (10%). Future interventions to improve antibiotic prescribing should consider aspects beyond choice of agent.

A community health nursing approach to the problem of antibiotic over-prescribing

Antibiotic resistance due to over-prescribing is a critical problem for society. The purpose of this study was to examine the effect of a nurse-led quality-assurance-based program designed to decrease inappropriate antibiotic prescribing rates in patients suffering from viral upper respiratory tract infections. The study was based in a network of community health centers in the Southeastern United States. A quasi-experimental design based upon pre- and postintervention measurement via chart reviews was utilized in the study. Both the pre- and postintervention chart reviews revealed high levels of inappropriate prescribing. Following intervention, no gross decrease in prescribing rates was noted. Qualitative differences were noted postintervention that included increased rates of prescriptions for delayed antibiotic therapy and decreased rates of reflexive prescription writing for farmers. Additionally, the results reflected the decreased use of broad-spectrum antibiotics after the intervention. Although the study utilized a limited sample, it shows promise for the use of quality assurance approaches in moderating inappropriate prescribing practices.

Variability in rates of use of antibacterials among 130 US hospitals and risk-adjustment models for interhospital comparison

OBJECTIVE

To describe variability in rates of antibacterial use in a large sample of US hospitals and to create risk-adjusted models for interhospital comparison.

METHODS

We retrospectively surveyed the use of 87 antibacterial agents on the basis of electronic claims data from 130 medical-surgical hospitals in the United States for the period August 2002 to July 2003; these records represented 1,798,084 adult inpatients. Hospitals were assigned randomly to the derivation data set (65 hospitals) or the validation data set (65 hospitals). Multivariable models predicting rates of antibacterial use were created using the derivation data set. These models were then used to predict rates of antibacterial use in the validation data set, which was compared with observed rates of antibacterial use. Rates of antibacterial use was measured in days of therapy per 1,000 patient-days.

RESULTS

Across the surveyed hospitals, a mean of 59.3% of patients received at least 1 dose of an antimicrobial agent during hospitalization (range for individual hospitals, 44.4%-73.6%). The mean total rate of antibacterial use was 789.8 days of therapy per 1,000 patient-days (range, 454.4-1,153.4). The best model for the total rate of antibacterial use explained 31% of the variance in rates of antibacterial use and included the number of hospital beds, the number of days in the intensive care unit per 1,000 patient-days, the number of surgeries per 1,000 discharges, and the number of cases of pneumonia, bacteremia, and urinary tract infection per 1,000 discharges. Five hospitals in the validation data set were identified as having outlier rates on the basis of observed antibacterial use greater than the upper bound of the 90% prediction interval for predicted antibacterial use in that hospital.

CONCLUSION

Most adult inpatients receive antimicrobial agents during their hospitalization, but there is substantial variability between hospitals in the volume of antibacterials used. Risk-adjusted models can explain a significant proportion of this variation and allow for comparisons between hospitals for benchmarking purposes.