Antibiotic prescribing for adults in ambulatory care in the USA, 2007-09.
ABSTRACT To determine patterns of ambulatory antibiotic prescribing in US adults, including the use of broad-spectrum versus narrow-spectrum agents, to provide a description of the diagnoses for which antibiotics are prescribed and to identify patient and physician factors associated with broad-spectrum antibiotic prescribing.
We used data for patients aged ≥18 years from the National Ambulatory and National Hospital Ambulatory Medical Care Surveys (2007-09). These are nationally representative surveys of patient visits to offices, hospital outpatient departments and emergency departments (EDs) in the USA, collectively referred to as ambulatory visits. We determined the types of antibiotics prescribed, including the use of broad-spectrum versus narrow-spectrum antibiotics, and examined prescribing patterns by diagnoses. We used multivariable logistic regression to identify factors associated with broad-spectrum antibiotic prescribing.
Antibiotics were prescribed during 101 million (95% CI: 91-111 million) ambulatory visits annually, representing 10% of all visits. Broad-spectrum agents were prescribed during 61% of visits in which antibiotics were prescribed. The most commonly prescribed antibiotics were quinolones (25% of antibiotics), macrolides (20%) and aminopenicillins (12%). Antibiotics were most commonly prescribed for respiratory conditions (41% of antibiotics), skin/mucosal conditions (18%) and urinary tract infections (9%). In multivariable analysis, among patients prescribed antibiotics, broad-spectrum agents were more likely to be prescribed than narrow-spectrum antibiotics for respiratory infections for which antibiotics are rarely indicated (e.g. bronchitis), during visits to EDs and for patients ≥60 years.
Broad-spectrum agents constitute the majority of antibiotics in ambulatory care. More than 25% of prescriptions are for conditions for which antibiotics are rarely indicated. Antibiotic stewardship interventions targeting respiratory and non-respiratory conditions are needed in ambulatory care.
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ABSTRACT: Inappropriate use of antibiotics for acute respiratory tract infections (ARTIs) has decreased in many outpatient settings. For patients presenting to US Emergency Departments (EDs) with ARTIs, antibiotic utilization patterns are unclear. We conducted a retrospective cohort study of ED patients from 2001-2010 using data from the National Hospital Ambulatory Medical Care Survey (NHAMCS). We identified patients presenting to US EDs with ARTIs and calculated rates of antibiotic utilization. Diagnoses were classified as antibiotic-appropriate (otitis media, sinusitis, pharyngitis, tonsillitis, and non-viral pneumonia); or antibiotic-inappropriate (nasopharyngitis, unspecified upper respiratory tract infection, bronchitis or bronchiolitis, viral pneumonia, and influenza).There were 126 million ED visits with a diagnosis of ARTI, and antibiotics were prescribed in 61%. Between 2001 and 2010, antibiotic utilization decreased for patients aged <5 presenting with antibiotic-inappropriate ARTI (RR 0.94; CI 0.88-1.00). Utilization also decreased significantly for antibiotic-inappropriate ARTI patients aged 5-19 years (RR 0.89; CI 0.85-0.94). Utilization remained stable for antibiotic-inappropriate ARTI among adult patients aged 20-64 years (RR 0.99; CI 0.97-1.01). Among adults, rates of quinolone use for ARTI increased significantly from 83 per 1,000 visits in 2001-2002 to 105 per 1,000 in 2009-2010 (RR 1.08; CI 1.03-1.14). Although significant progress has been made toward reduction of antibiotic utilization for pediatric patients with ARTI, the proportion of adult ARTI patients receiving antibiotics in US EDs is inappropriately high. Institution of measures to reduce inappropriate antibiotic use in the ED setting is warranted.Antimicrobial Agents and Chemotherapy 12/2013; · 4.57 Impact Factor