The pediatric nurse practitioner and the physician assistant: how are we different?

Nurse practitioners and physician assistants revisited: do their practice patterns differ in ambulatory care?

The education and regulation of nurse practitioners and physician assistants would suggest unique role differentiations and practice functions between the professions. This study explored to what extent their practice patterns in primary care actually differ. It was hypothesized that the primary care services provided by nurse practitioners would tend to be women and family health services, health prevention and promotion oriented, provided to minority and socioeconomic disadvantaged patients, and less dependent on physician supervision. In contrast, the services provided by physician assistants would more likely be medical/surgical oriented; diagnostic, procedural, and technical in nature; likely to be in rural areas; and more dependent on physician supervision. The study used patient data from the National Ambulatory Medical Care Survey and National Hospital Ambulatory Medical Care Survey. Although some differences emerged, the argument is not compelling to suggest strong, unique, practice differences across all ambulatory care settings between the two types of nonphysician providers. It is the specific type of ambulatory setting that influences the practice pattern for both provider groups. If practice patterns are less distinctive than previously believed, more opportunities for interdisciplinary education need to be explored, and health policies that promote a discipline-specific primary care workforce may need to be reexamined.

Characteristics of patient visits to nurse practitioners and physician assistants in hospital outpatient departments

Many authors have described differences between nurse practitioners and physician assistants. Most studies have compared physician with nonphysician providers' practice. Few studies have compared nurse practitioners and physician assistants, and none has used a national data base. This exploratory, atheoretical research examined which of the following characteristics predicted patients being seen by nurse practitioners and physician assistants: patient and hospital demographics, diagnosis, diagnostic/screening services, therapeutic services, and disposition of the visit. The data set used for analysis was the 1992 National Hospital Ambulatory Medical Care Survey. Based on a multistage probability design yielding national estimates for patient visits in hospital outpatient settings, the National Hospital Ambulatory Medical Care Survey showed that there were 2,847 weighted patient visits to either nurse practitioners or physician assistants (4.6 million patient visits using national estimates). Results of multivariate logistic regression suggest that nurse practitioners were the most likely nonphysician provider for outpatients receiving more health promotion and counseling (therapeutic) services and for those needing women's and children's services. Outpatients in rural areas predicted visits to physician assistants. As more nonphysician providers enter the work force, the results of this research may assist with understanding the utilization of nurse practitioners and physician assistants in primary care.