Effects of knowledge, attitudes, and practices of primary care providers on antibiotic selection, United States.

Antibiotic prescribing guidelines establish standards of care, help focus efforts on quality improvement, and have been shown to improve patient outcomes (1-3). Many guidelines emphasize the importance of diagnostic certainty for the management of bacterial upper respiratory tract infections and promote P-lactam agents, such as amoxicillin or amoxicillin-clavulanate, as the preferred first-line therapy (4-6). Studies indicate that health care providers often do not adhere to established clinical practice guidelines for the management of common infections (7-9). Prescribing rates for second-line, broad-spectrum antibiotics among outpatients have increased, contributing to a growing problem of antibiotic-resistant infections (10-14). It is not clear whether nonadherence is related to lack of familiarity with clinical practice guidelines or if other factors influence antibiotic selection once a diagnosis is established.

Published qualitative studies that have examined antibiotic selection among primary care providers (PCPs) are outdated and focus on non-US-based physicians; they do not include nurse practitioners or physician assistants, who together comprise >25% of the US primary care workforce (15-22). The objectives of this study are to explore US PCP knowledge, attitudes, and self-reported practices (KAPs) concerning antibiotic therapy, assess factors that influence provider antibiotic choice, and provide an update on PCP attitudes regarding antibiotic resistance.

Methods

We conducted in-depth interviews by digitally recorded telephone calls, and transcribed the recordings to text to accurately and reliably assess PCP KAPs. The qualitative method of an open-ended interview by telephone was chosen to ensure candid and truthful answers from participants. We composed a screening questionnaire to recruit physicians, nurse practitioners (NPs), and physician assistants (PAs) from a nationwide marketing database in the United States. We initially contacted and screened potential participants (online Technical Appendix Section A, wwwnc.cdc.gov/EID/article/20/12/14-0331-Techapp1.pdf) using telephones, email, and fax transmission of documents. Inclusion criteria included self-reporting of spending [greater than or equal to] 50% of medical practice time in direct patient contact in a primary care setting, [greater than or equal to] 30 years of age, and fluency in the English language. Interviewees were excluded from this study if they had an immediate family member who was employed in an industry that could represent a conflict of interest, including advertising or public relations, the federal government, market research, news media, or the pharmaceutical industry; if they had board certification in a subspecialty outside of primary care; or if they had practiced medicine >30 years at the time of recruitment.

Thirty-six PCPs were selected for the study. Specialties for the 27 physician participants selected included pediatrics (n = 9), family medicine (n = 9), and internal medicine (n = 9). Among PAs (n = 4) and NPs (n = 5), 6 practiced in family medicine settings and 3 practiced in pediatrics. Provider specialty, years in practice, and demographic information are described in Table 1.

Interviews were conducted during May 2013. One professional moderator who had >25 years of moderating experience conducted all interviews. Based on a discussion guide prepared by our research team (data not shown), participants were first informed of the sponsoring organization (Centers for Disease Control and Prevention, Atlanta, GA, USA), the planned use of data, and presence of listeners; they were then asked "warm-up" questions about the practice setting in which the participant worked and the patient populations whom they served. Next, each interview proceeded through an ordered list of open-ended questions on self-reported antibiotic prescribing practices, perceived prescribing practices of their peers, attitudes toward clinical practice guidelines for common bacterial infections, knowledge of narrow--versus broad-spectrum antibiotic agents, preferred resources and methods for medical education and antibiotic treatment, and attitudes toward antibiotic resistance.

Participants were provided a worksheet before the interview (online Technical Appendix, Section B) which asked them to rank each of 12 factors on the basis of its perceived influence on antibiotic selection when an antibiotic is indicated (e.g., illness severity, patient demand for an antibiotic, or clinical practice guidelines). Worksheet answers were discussed and recorded during the interview.

To assess compliance with clinical practice guidelines and to evaluate clinical decision-making, each participant was given a clinical vignette about a patient (online Technical Appendix, Section C) who had a diagnosis of an acute bacterial infection: acute otitis media (AOM) for pediatricians, acute bacterial rhinosinusitis for internists, acute uncomplicated cystitis for family practitioners, and group A streptococcal pharyngitis for PAs and NPs. The participant was asked to explain his or her rationale in choosing an antibiotic agent and why other PCPs might choose nonrecommended antibiotics. For the purposes of this study, antibiotics considered to be broad-spectrum include penicillins containing [beta]-lactamase inhibitors (e.g., amoxicillin/clavulanate), second through fifth generation cephalosporins, macrolides, quinolones, and lincomycin derivatives. Narrow-spectrum agents include penicillins (e.g., amoxicillin), first generation cephalosporins, sulfonamides, and nitrofurantoin. Each participant received a cash incentive after the interview in exchange for participating.

Interviews were transcribed by project staff, and each member of the research team either listened to interview recordings or read corresponding interview transcripts. Relevant excerpts were coded into compilations of references to specific themes and were used to identify the most frequent responses to discussion topics outlined in the discussion guide. We identified common themes using both inductive and deductive methods that were reviewed by all authors. Author disagreement on theme selections were discussed until a consensus was met. If no consensus was met by most study authors, the theme was excluded from our results. We performed in-depth analyses of themes by reading and coding transcribed responses using Nvivo 9 (QSR International, Burlington, MA). This study was reviewed and approved for exemption status by the Human Research Protection Office of the Centers for Disease Control and Prevention.

Results

We conducted 36 interviews, each lasting [approximately equal to] 45 minutes. Through analysis of provider in-depth interviews, several common themes regarding antibiotic prescribing and antibiotic resistance were identified (Table 2).

Antibiotic Selection

PCPs generally cited little difficulty selecting antibiotic treatments for common infections, but indicated that allergies, complicated medical histories, and recurrent infections regularly make antibiotic selection more challenging. Previous experience and familiarity with an agent were frequently cited as influential factors when choosing antibiotic therapy. Results from the ranking exercise suggest that illness severity, medical history, and clinical practice guidelines were important considerations across all specialties.

When asked why their peers made inappropriate choices regarding antibiotic selection, responses varied. The most common perceived reasons for inappropriate antibiotic prescribing were pressure from patients or parents; desire to prevent litigation as a result of complications of infections; concern for patient or parent satisfaction with the visit; and perceived decreases in visit length. Illnesses for which participants believed appropriate antibiotic selection was more difficult for their peers included sinus infections and recurrent urinary tract infections.

Broad-spectrum agents were widely thought to be more successful for curing an infection than narrow-spectrum antibiotics. One participant noted that broad-spectrum antibiotics are often chosen because less uncertainty exists regarding the adequacy of antimicrobial activity, which is why they may be commonly selected even if a narrow-spectrum agent is indicated. When asked whether antibiotic spectrum was a consideration when prescribing an antibiotic, participants indicated that it was generally not as important as choosing a drug known to successfully treat the infection. Choosing a narrow-spectrum agent was perceived to be a more attractive option when the diagnosis was more certain or when a patient was perceived to have a benign clinical condition.

PCPs commonly perceived that patients expect an antibiotic for clinical visits, contributing to a shared feeling of pressure among PCPs to satisfy patients. Concern was further expressed that patient satisfaction scores are a common method by which providers are evaluated by hospital administration and insurance companies and that this may inadvertently contribute to more frequent antibiotic prescribing. Some participants believed that such evaluation methods could be a barrier to appropriate antibiotic use. PCPs in private practice said they were particularly sensitive to patient desires and were concerned that their patients might leave their practice in favor of another physician if their expectations were not met.

Several participants believed other health care providers' prescribing behaviors negatively affected their own. For example, if a patient sees a PCP and receives a course of antibiotics, and later visits another PCP for a separate infection with the same symptoms, they have the established expectation to receive another course of antibiotics. As a result, the new provider feels pressured by such expectations to prescribe antibiotics even if they may be inappropriate.

Responses to the clinical vignettes were generally in line with the recommended first-line therapies. Among 9 participants given a case describing acute bacterial sinusitis, 7 appropriately chose amoxicillin or amoxicillin/ clavulanate. One participant chose to treat the patient with moxifloxacin, and another chose azithromycin. Sixteen of 18 PCPs given clinical vignettes of either AOM or group A streptococcal pharyngitis selected the recommended first-line treatments amoxicillin or penicillin. In response to the clinical vignette for acute cystitis, only 4 of 9 family practitioners selected the first-line agent nitrofurantoin; 4 others chose to treat the patient with a fluoroquinolone, and 1 chose to prescribe trimethoprim-sulfamethoxazole.

Broad--and Narrow-Spectrum Definitions

Participants had no shared definition of "broad-spectrum antibiotic" or "narrow-spectrum antibiotic" regardless of specialty or number of years in practice. When asked to define broad- versus narrow-spectrum antibiotics, responses varied (Table 2). Although many participants believed antibiotic spectrum referred to the classes of bacteria (gram-positive, gram-negative, or anaerobic) treated, others believed it referred to the number of pathogens addressed (e.g., a narrow-spectrum antibiotic might affect only 2 or 3 pathogens and a broad-spectrum antibiotic might affect many).

Although some participants correctly identified amoxicillin as a narrow-spectrum agent, and azithromycin as a broad-spectrum agent, many participants were uncertain of the spectrum of antimicrobial activity for these 2 widely used antibiotics. In general, participants were able to correctly identify fluoroquinolones and later-generation cephalosporins as broad-spectrum agents, especially in relation to other antibiotics. Many participants agreed that broad and narrow-spectrum antibiotics were not uniformly defined among their colleagues.

Changing Prescribing Habits

Respondents believed that changing prescribing behaviors is a difficult task. When asked why some health care providers are reluctant to change their prescribing practices, many participants believed that health care providers are used to the way they have been practicing medicine for years. They believed that even when providers are familiar with established clinical practice guidelines, it may not matter because they seldom change their prescribing behaviors. Several respondents believed the best way to change antibiotic prescribing behavior is to change the expectations of patients so the pressure to prescribe antibiotics is reduced.

Respondents' preference of how they would like to receive information regarding antibiotic selection varied. Some participants suggested incorporating information in the electronic medical record to improve prescribing (e.g., a clinical decision support prompt would display on the computer in use if a physician entered an order for a prescription that is not standard for the diagnosis). One frequent suggestion to improve antibiotic prescribing was to have a quick reference guide for each major diagnosis, including antibiotic indications and causative pathogens. Another suggestion was to have a mobile telephone application available without Internet access. Several respondents saw value in having easy access to antibiotic resistance data for their local area.

Concern for Antibiotic Resistance

Participants generally agreed that antibiotic resistance is a concern for their patients and for public health; however, it was not commonly mentioned as a factor when considering which antibiotic to prescribe. Several participants expressed serious concerns about the availability of effective antibiotic therapies in the future related to increases in antibiotic resistance. Respondents also noted an increasing frequency of patients who were reluctant to begin antibiotics or complete their course of antibiotics because of concerns about antibiotic resistance.

Discussion

Our study shows that PCPs do not always adhere to guidelines because they believe broad-spectrum antibiotics may be more likely to cure an infection, a finding corroborated by the well-documented overuse of broad-spectrum antibiotics (23). However, the perception of better cure rates when using broad-spectrum agents is unfounded. For example, Streptococcus pneumoniae, a pathogen frequently implicated in bacterial respiratory infections, has a much higher prevalence of resistance to macrolides than it does to amoxicillin (24,25). Nevertheless, azithromycin is often chosen over amoxicillin for the empiric treatment for AOM, sinusitis, and other respiratory infections (25,26). Similarly, for the treatment for acute uncomplicated cystitis, widespread use of fluoroquinolones has contributed to rising antimicrobial resistance, rendering ciprofloxacin far less active against urinary tract Escherichia coli infections than the more narrow-spectrum, first-line agent nitrofurantoin (27). The perceived association between broad-spectrum antibiotic use and better cure rates may regularly contribute to inappropriate antibiotic selection and warrants further attention from appropriate antibiotic use initiatives.

There is no widely accepted definition of broad- versus narrow-spectrum antibiotics among PCPs or their professional organizations. Although a list of "antibiotics of concern" has been published by the National Committee on Quality Assurance (28) and has been used in previous research to classify antibiotics as broad-spectrum (29,30), the list was not originally intended for this purpose. Clinical practice guidelines emphasize use of narrow-spectrum antimicrobial agents instead of their broad-spectrum counterparts (4,5,31,32). However, the effect of these messages may be limited because of lack of clarity regarding what constitutes a narrow- versus broad-spectrum antibiotic. For example, few participants in our study were able to confidently categorize macrolides and penicillins, which are among the most commonly prescribed classes of antibiotics (33), as broad or narrow spectrum. Although this issue is largely one of semantics, it has critical implications for medical education, public health messaging, and community antibiotic resistance. Communication to PCPs related to antibiotic choice should not focus on dichotomous narrow- versus broad-spectrum terminology, but rather promote specific recommended first-line and targeted antibiotic therapies for individual diagnoses.

Compared with results of previous qualitative studies, PCPs participating in this study expressed greater urgency regarding antibiotic resistance. For example, in a 1998 qualitative study exploring driving factors of antibiotic misuse, a principal barrier to change in antibiotic prescribing was the attitude that antibiotic resistance was not an important problem (19). Another study published in the same year noted similar findings (21). Conversely, not a single provider in this study dismissed antibiotic resistance as being a minor issue, and several expressed grave concerns about antibiotic resistance based on their own experiences.

Modifying prescriber behavior is a complex and difficult task. Multifaceted interventions that involve a combination of interactive group meetings, outreach visits to individual physicians, physician reminders, or patient-based interventions (e.g., delayed prescribing practices) have shown the most promise in changing prescribing behaviors in ambulatory care settings (34,35). Previous studies confirm that patients desire antibiotics less frequently than providers perceive and that inappropriate prescribing is a common result of this miscommunication (21,36,37). This finding suggests that an effective target for intervention is narrowing the gap between patient expectations and clinician perception of these expectations for antibiotics. Regardless of the intervention considered for promoting appropriate antibiotic use, the concerns of PCPs highlighted in this study should be addressed. This includes reassuring providers of the efficacy of first-line and targeted therapies, clarifying the role of antibiotic prescriptions in patient satisfaction, and providing resources that streamline patient education efforts in primary care settings.

This study has limitations, however. Although in-depth interviews are an effective method to explore individual providers' KAPs, we cannot generalize our findings to the PCP population as a whole because of the lack of external validity inherent in this type of qualitative research. Similarly, the clinicians who were screened, selected for participation, and agreed to be interviewed may hold stronger opinions about this topic than those who were excluded or declined to participate.

Our study suggests that inappropriate antibiotic selection among PCPs is not caused by lack of familiarity with guideline recommendations. Rather, this practice is the result of a complex interaction between perceived better cure rates for nonrecommended therapies and attempts to meet demands typical in primary care settings.

Future research efforts should be aimed at investigating effective incentives for appropriate antibiotic prescribing and determining alternative communication strategies to encourage use of first-line agents. Although most efforts have focused on reducing unnecessary antibiotic use, more research is needed to clarify which interventions improve antibiotic selection. Although awareness regarding antibiotic resistance appears to be improving, ongoing education efforts promoting appropriate antibiotic use among both patients and health care providers (e.g., CDC's Get Smart: Know When Antibiotics Work Program) are critical to addressing the growing threat of antibiotic resistance.

Acknowledgments

We thank staff of Oak Ridge Institute for Science and Education and Oak Ridge Associated Universities for their help in preparing for, conducting, and analyzing the interviews for this study.

Mr Sanchez is a board-certified physician assistant and a public health scientist for the Get Smart: Know When Antibiotics Work program. His research interests include outpatient antibiotic prescribing and antibiotic resistance within the United States.

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Guillermo V. Sanchez, Rebecca M. Roberts, Alison P. Albert, Darcia D. Johnson, and Lauri A. Hicks

Author affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

DOI: http://dx.doi.org/10.3201/eid2012.140331

Address for correspondence: Guillermo V. Sanchez, Centers for Disease Control and Prevention, 1600 Clifton Rd NE, Mailstop C25, Atlanta, GA 30329, USA; email: gsanchez@cdc.gov

Table 1. Characteristisc of primary care providers interviewed for
knowledge, attitudes, and practices in antibiotic drug selection,
United States *

Characteristic          Physician, n = 27   NP or PA, n = 9

Sex
  M                            18                  1
  F                             9                  8
Race/ethnicity
  White                        18                  9
  Black                         4                  0
  Asian                         3                  0
  Hispanic                      1                  0
  Other                         1                  0
Years in practice
  <10                           5                  5
  10-20                        11                  3
  21-30                        11                  1
Medical specialty
  Pediatrics                    9                  3
  Family medicine               9                  6
  Internal medicine             9                  0

* NP, nurse practitioner; PA, physician assistant.

Table 2. Topics and quotations from in-depth interviews with primary
care providers regarding antibiotic therapy and antibiotic
resistance, United States

Topic                     Quotation
Antibiotic selection      "We as doctors are business people.
                          We're no different than running a
                          shoe store. If somebody comes in and
                          wants black shoes, you don't sell
                          them white shoes. And if you do, they
                          get upset. You can convince a patient,
                          look if I were you I wouldn't take
                          this antibiotic ... but patients in
                          general don't understand that concept
                          of not taking it if you don't need it
                          ... [and] if you don't give it to them,
                          they don't come back to you."

                          "The patient [may] call you up and ...
                          tell you ... call me in some X, Y or
                          Z because everybody wants to hurry up
                          and get better faster. Sometimes [you
                          worry] about 1-800 call you-know-lawyer.
                          [Maybe] you don't have a standing
                          relationship with the patient and you
                          don't know [if they will] come back if
                          they are not getting better. All of
                          those things [affect antibiotic
                          selection]. But if you are pretty
                          comfortable and have a good relationship
                          [with a patient], you [may] not
                          necessarily go straight to a broad-
                          spectrum antibiotic."

                          "[Broad-spectrum antibiotics] take the
                          thinking out of it for me so that I am
                          not trying to figure out what the
                          organism is and [which] particular
                          antibiotic treats the organism. "

                          "It's very simple. Patients come to
                          the doctor and they want an antibiotic.
                          If they don't get better, they get
                          upset ... I had a patient who came to me
                          who had bronchitis and I started her on
                          azithromycin ... however, she did not
                          get better. She came to see my colleague
                          and [he] did not change the antibiotic,
                          but gave her Prednisone and that got her
                          better within 24 hours. She was mad at
                          me, because I apparently did not give
                          her 'the right antibiotic' and my
                          partner did."

Broad- and                "If it's narrow, it [covers] one
narrow-spectrum           particular class of organism like
definitions               gram-negative. If it's broad, it's
                          going to be different types like
                          gram-negative, gram-positive, anaerobes
                          to treat a wider spectrum of
                          infections."

                          "The more bacteria the antibiotic works
                          ... against, you call it broader. If
                          this antibiotic only works against one
                          or two types of bacteria, then that is
                          a narrow-spectrum [antibiotic]."

                          "The one thing no one's going to argue
                          about is penicillin being
                          narrow-spectrum."

                          "Amoxicillin is a great example of a
                          very broad-spectrum antibiotic."

                          "I guess it is pretty subjective, the
                          definition [of broad- versus
                          narrow-spectrum antibiotics]."

Education and resources   "During residency.when you see patients
for antibiotic             with different conditions and decide
treatment                 how you want to treat them and see how
                          the attending ... chooses to treat
                          them, I think that's when you learn
                          the most."

                          "I think there needs to be more education
                          to providers about the real dangers of
                          antibiotic resistance. You get taught that
                          in school and ... you don't ever hear about
                          it again, and you get busy in your
                          practice, it's not your number one
                          priority. And you ... get to where you
                          really don't think about it, but it is
                          a huge issue."

                          "I think [focusing education efforts only
                          on students and residents] would be a
                          mistake. I think that's the conclusion
                          you would draw if you assume the rest of
                          the system stayed unchanged. If you just
                          focus on the young doctors you're still
                          going to wait 15 years for that change
                          to take place. "

Changing prescribing      "Habits are hard to change. I will say
habits                    that. So if someone's used to writing
                          Zithromax ... they're not going to stop
                          because it's easy, patients want it, and
                          they want the patients to go away and be
                          happy. But I think pushing the knowledge
                          is helpful, and change takes time."

                          "[Physicians] tend to be rigid. That's
                          it, really; a new generation that has
                          learned its own rigid rules that come in
                          and replace the previous ... It's not
                          that any new crop of doctors is any more
                          malleable, it's the fact that everybody's
                          not malleable ... [they] resort to the way
                          they were during residency. "

                          "Patients don't realize [antibiotic
                          resistance could affect them] and some
                          of them don't even care. You can say 'one
                          day you're going to [have a resistant
                          infection]' and they'll say 'oh, they'll
                          make more [drugs]'."

Antibiotic resistance     "It is very scary because we are seeing
                          increasingly resistant germs. We had a
                          lady in the office the other day [with] a
                          urinary infection [resistant to] every
                          single oral antibiotic on the entire list
                          of the culture and sensitivity report.
                          There wasn't a single oral medicine that
                          could be used ... It was resistant
                          to everything."

                          "We haven't had a new antibiotic for at
                          least 10 years and something is going to
                          happen one of these days. We are going to
                          get a big, big multi-drug resistant
                          bacteria and we are going to end up with
                          nothing to treat this thing ... and then
                          we are going to be in trouble. That is
                          my main concern."

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