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Biomedical subjects

R Parrott

Publications and source records attributed to R Parrott.

16 recordsLinked to original sources
PubMed2004

Strongly magnetized antihydrogen and its field ionization.

Internal orbits of experimentally analyzed antihydrogen (H) atoms depend as much on an external magnetic field as on the Coulomb force. A circular "guiding center atom" model is used to understand their field ionization. This useful model, assumed in the theory of three-body H recombination so far, ignores the important coupling between internal and center-of-mass motion. A conserved pseudomomentum, effective potential, saddle point analysis, and numerical simulation show where the simple model is valid and classify the features of the general case, including "giant dipole states."

Journal Article↗
PubMed1999

Readability of skin cancer prevention brochures targeting parents of young children.

Long-term exposure to UV radiation and severe sunburns increase one's risk of experiencing malignant melanoma later in life, so parents need to be informed about how to protect children from overexposure to the sun. We attempted to determine readability of skin cancer brochures targeted toward parents of young children. SMOG and FOG readability formulas were applied to 8 brochures published by the American Cancer Society, Skin Cancer Foundation, American Academy of Dermatology, and the Anti-Cancer Council. Readability levels of the brochures ranged between the 8th and 12th grade levels. To reduce the incidence of skin cancer, sun-safe knowledge and behavior should start in childhood. Pediatricians need access to brochures written at readability levels for the average parent. Skin cancer brochures written at the eighth or ninth grade comprehension levels may allow pediatricians to educate more parents about the importance of skin cancer prevention in childhood.

Child↗
PubMed1999

Communicating about youth's sun exposure risk to soccer coaches and parents: a pilot study in Georgia.

Efforts to increase the sun-protective behaviors of children were extended to outdoor recreational sports and youth soccer settings in this study. The pretest results of a pilot survey of coaches (n = 12), parents (n = 50), and youths (n = 61) on eight soccer teams in south Georgia were used to guide the development of a health education program for coaches. In the pilot programs, half the coaches were trained to be involved in soccer-playing youths' sun protection by acting as positive role models and promoting sun protection to youths and their parents. The pilot demonstrated coaches' willingness to participate in sun protection promotion to youth: Youths indicated that coaches and parents were more likely to tell youths to wear sunscreen after the training than before, and coaches perceived getting youths to wear sunscreen to be less difficult than before.

Adolescent↗
PubMed1997

Is there an increased prevalence of severe learning disabilities among British Asians?

Age-specific prevalence rates for learning disabilities among the Asian communities in three Metropolitan Boroughs in the North of England are presented. These data indicate that: (1) below school age there is little difference in the apparent prevalence of severe learning disabilities between the Asian and non-Asian communities; (2) between 5 and 34 years of age, however, the apparent prevalence of severe learning disabilities is approximately three times higher among the Asian community when compared with the non-Asian community.

Adolescent↗
PubMed1997

Peer discussion on training physicians to be competent communicators: support for a multiple discourse approach.

To consider medical educators' views about training physicians to be competent communicators, a focus group was conducted at a large southeastern medical college with faculty responsible for training interns and residents to be competent communicators. The medical school was undergoing a curriculum review and instructional development process, including an examination of the methods being used to teach communication. A discussion of a teaching faculty committee revealed several themes, including the foundational assumption that communication is a natural ability that some have and others do not. Other notions likely to affect the educators' beliefs about the importance and effectiveness of communication education include the ideas that courtesy is synonymous with good communication and that although a few fundamentals might be transmitted, experience is the best teacher. Participants identified several audiences, in addition to patients, with whom they communicate as part of their profession, including other physicians, other health care providers (e.g., nurses and lab technicians), and hospital administrators, health care insurers, and others responsible for evaluating physicians' performance. The implications of this project for the development of medical communication courses within a multiple discourse approach are discussed.

Communication↗
PubMed1996

Georgia's harvesting healthy habits: a formative evaluation.

Occupational safety and health researchers seek to conduct effective cancer awareness campaigns to increase agricultural workers' skin cancer prevention and detection behaviors. Georgia undertook such a project using a social cognitive theory (Bandura, 1986) conceptual model, with its objectives focusing on personal determinants of and environmental influences on farmers' behavior. One underused strategy to increase the success of health campaigns, formative evaluation, was undertaken during year one of the demonstration project, with four goals. These included an assessment of: (1) the availability of societal resources to support farmers' practices, (2) the affordability for farmers to follow through with behaviors being promoted, (3) the social support for behaving in ways that reduce farmers' skin cancer risk, and (4) farmers' current knowledge, outcome expectations, and self-efficacy in this regard. Formative evaluation revealed an absence of information, products, services, and social support for farmers' skin cancer prevention and detection. As a result, the Georgia project's plan was refined to include specific activities aimed at increasing the environmental support for health promotion activities relating to farmers' skin cancer prevention and detection. These include a seminar for rural primary care physicians and public health nurses to increase knowledge and skills relating to conducting clinical skin exams; programs for agricultural extension agents, cotton scouts, and 4-H groups to provide opportunities to learn more about and practice sun safety; and a feed and seed store campaign.

Agriculture↗
PubMed1996

Natural history of human immunodeficiency virus disease in perinatally infected children: an analysis from the Pediatric Spectrum of Disease Project.

OBJECTIVE: To describe the progression of human immunodeficiency virus (HIV) disease through clinical stages from birth to death among a large number of perinatally infected children. METHODS: The Pediatric Spectrum of Disease (PSD) project, coordinated by the Centers for Disease Control and Prevention (CDC), has conducted active surveillance for HIV disease since 1988 in seven geographic regions. PSD data are collected from medical and social service records every 6 months through practitioners at each participating hospital clinic. We analyzed data from perinatally HIV-infected children born between 1982 and 1993. The natural history of HIV disease was divided into five progressive stages using the clinical categories in the CDC 1994 pediatric HIV classification system: stage N, no signs or symptoms; stage A, mild signs or symptoms; stage B, moderate signs or symptoms; stage C, severe signs or symptoms; and stage D, death. A five-stage Markov model was fitted to the PSD data. To compare the estimates from the PSD project with the published estimates, we also fitted an alternative Markov model using acquired immunodeficiency syndrome (AIDS; 1987 case definition) in place of stage C and also calculated standard Kaplan-Meier estimates. RESULTS: A total of 2148 perinatally HIV-infected children were included in the analysis. The estimated mean times spent in each stage were: N, 10 months; A, 4 months; B, 65 months; and C, 34 months. We estimated that a child born with HIV infection has a 50% (95% confidence interval [CI], 40%-60%) chance of severe signs or symptoms developing by 5 years of age and a 75% (95% CI, 68%-82%) chance of surviving to 5 years of age. For a child in stage B, there is a 60% (95% CI, 49%-71%) chance of severe signs or symptoms developing within the next 5 years and a 65% (95% CI, 56%-73%) chance of surviving 5 more years. The estimated mean time from birth to stage C was 6.6 (95% CI, 5.7-7.5) years, and the estimated mean survival time from birth was 9.4 (95% CI, 8.1-10.7) years. From the alternative Markov model, the estimated mean time from birth to AIDS was 4.8 (95% CI, 4.5-5.2) years. CONCLUSION: Markov modeling using the revised pediatric classification system allowed us to describe the natural history of HIV disease in children before diagnosis of AIDS. On average, children progress to moderate symptoms in the second year of life and then remain moderately symptomatic for more than half of their expected lives, underscoring their need for clinical care before the onset of AIDS. The results from the Markov model are useful in family counseling, health care planning, and clinical trial designs.

Acquired Immunodeficiency Syndrome↗
PubMed1995

Patterns of self-disclosure across social support networks: elderly, middle-aged, and young adults.

Self-disclosure has generally been examined as a unidimensional construct which relates to intimacy in developing relationships. Self-disclosure also serves many functions in established relationships, such as with close friends and family. Moreover, the functions served by self-disclosure may vary depending upon the adults' gender and stage in the life-span. In this study, such issues are examined with regard to elderly, middle-aged, and young adults' use of four functions of self-disclosure: self-expression, self-clarification, social control, and social validation. Findings support the claim that greater intergenerational distance is related to less self-disclosure among members of a social network. Further, elderly adults self-disclose more often to family than to friends, while young adults self-disclose to friends more often than to family. Implications for self-disclosure within the areas of gender, social support, and social comparison are discussed, and the appropriateness of adults' disclosure patterns within a framework of life stages is considered.

Adult↗
PubMed1992

Biologic, foster, and adoptive parents: care givers of children exposed perinatally to human immunodeficiency virus in the United States. The Pediatric Spectrum of Disease Clinical Consortium.

Children born to human immunodeficiency virus (HIV)-infected mothers often do not live with a biologic parent because of drug use, illness, or death of the mother. Public health officials need to know the number and proportion of children who will require care by someone other than a biologic parent (alternative care giver). The Pediatric Spectrum of Disease project, conducted in six different geographic regions in the United States, assesses issues specific to HIV in children. Among the information being collected in this study are data regarding the primary care giver. Of 1683 children born to HIV-infected mothers and enrolled through 1990, 55% (937) were living with a biologic parent, 10% (169) with another relative, 28% (455) were in foster care, 3% (55) had been adopted, and 4% (67) lived in group settings or with other care givers. In all locations and for all racial/ethnic groups, children of mothers who used intravenous drugs were more likely to be living with an alternative care giver than were children of mothers who had not used intravenous drugs (odds ratio 4.15). However, there were striking variations by study location (odds ratio range 1.4 to 7.2). The data suggest that maternal drug use may be the most important factor determining whether a child lives with a biologic parent and that there are also regional differences in alternative care placement.

Adoption↗
PubMed1989

Privacy between physicians and patients: more than a matter of confidentiality.

This study examined patients' perceptions (N = 427) of the meaning of privacy within the physician-patient dyad. The recognition of the importance of privacy, the norms that govern privacy, and the specific behaviors that may be considered to violate privacy in relationships has most often received only general attention by researchers. Recent evidence from the field of communication supports the multidimensional and situational nature of privacy. Thus, in contrast to the usual conception of patient confidentiality as an issue focused on information, confidentiality is cast as a topic within both the informational and psychological realms of privacy. Implications for current medical interviewing practices, especially with regard to questions that concern patients' sexual behavior, are discussed.

Adolescent↗
PubMed1983

Characteristics of schizophrenic and depressed patients excluded from clinical research.

The process of selecting patients for research studies introduces factors that can bias outcome. The authors compared schizophrenic and depressed patients accepted for studies on their clinical research unit with patients admitted to the hospital with the same diagnoses. They found significant differences between the two groups in age, sex, and legal status. The authors conclude that many research populations may not be representative of general patient populations for a number of reasons and argue that research studies also need to focus on patients who do not meet research ward criteria.

Adult↗
PubMed1983

A double-blind comparison of bupropion and amitriptyline in depressed inpatients.

Bupropion and amitriptyline were compared in a double-blind study of depressed inpatients. Treatment ranged from 2 to 4 weeks: early responders (Hamilton Depression Scale scores less than 10) were often removed from treatment after 2 or 3 weeks. Twenty-two patients completed treatment with bupropion and 18 with amitriptyline. Doses ranged from 450 to 750 mg/day for bupropion and 75 to 225 mg/day for amitriptyline. Overall, bupropion and amitriptyline were equally effective, as measured by the Hamilton Depression and Anxiety scales, Clinical Global Impressions, Zung Depression scale, and the SCL-90. Differences in the side effect profile and in weight change are described.

Adult↗
PubMedDate not supplied

Self-efficacy and rural women's performance of breast and cervical cancer detection practices.

Self-efficacy has become an important variable in multiple areas of human performance, including health behavior modification (Bandura, 1997). This study explores variables that lead to women's perceived self-efficacy in performing regular detection practices for breast and cervical cancer. A sample of southeastern U.S. farm women (N = 206) completed surveys that assessed their perceived and actual knowledge of women's cancer detection practices, as well as their perceived social norms and perceived barriers related to obtaining these tests. Regression analyses of these data revealed that perceived peer norms and the barriers of time and embarrassment were significant predictors of women's confidence in their ability to follow through with cancer detection practices. Perceived knowledge and perceived family norms significantly predicted women's perceptions of difficulty associated with cancer detection practices as well as women's confidence in their skills to perform breast self-examination (BSE). Time was also a significant barrier to confidence in performing BSE. Implications for health communication campaigns are discussed.

Breast Neoplasms↗
PubMedDate not supplied

Migrant farm workers' access to pesticide protection and information: Cultivando Buenos Habitos campaign development.

Formative evaluation of south Georgian migrant farm workers' access to information and products to promote pesticide protection and understanding of cancer risk associated with pesticide exposure was conducted using field observation, in-depth interviews of Georgia's Migrant Health Program's outreach workers, and structured face-to-face surveys of migrant farm workers. The data indicated that fewer than one-third of the pesticide products reviewed contained messages about pesticide use and exposure risk for humans. Risk information on products appeared in English only. Few protective devices were available for purchase. Migrant farm workers were aware in a very general sense of health risks posed by pesticides, but they were specifically unaware of the reach of pesticides sprayed, as illustrated by their field behaviors. Findings also demonstrated the need to educate outreach workers about migrant farm workers' cancer risk, so that they may act as migrant farm workers' health advocates to reduce the adverse effects associated with pesticide exposure.

Adolescent↗