Rectification of STM Current to Graphite Covered with Phthalocyanine Molecules.

The scanning tunneling microscope (STM) can be used to measure current-voltage characteristics on an atomic scale. The attachment of copper phthalocyanine molecules, in contrast to a variety of other molecules, to graphite changes the electrical characteristics of the STM from relatively symmetric to highly asymmetric or rectifying. Evidence is presented to show that the asymmetry arises because of the electronic energy levels of the copper phthalocyanine. The organic molecules were bonded to the graphite by an acid-base reaction that may have wide applicability.

Flash X-ray Microscopy.

Soft x-ray contact microscopy, utilizing single-shot exposures of approximately 60 nanoseconds duration in polymethyl methacrylate, has been realized with a resolution of 300 angstroms. The radiation spectrum is intense in the "window" between 23 and 44 angstroms where water is transparent compared to biological materials, and therefore permits viewing of wet samples.

Production of bioactive and immunoreactive interleukin-6 (IL-6) and expression of IL-6 messenger ribonucleic acid by human pituitary adenomas.

Preliminary studies have demonstrated that some pituitary adenomas secrete immunoreactive interleukin-6 (irIL-6) when cultured in vitro. We have extended these studies by investigating 100 pituitary adenomas of different types measuring immunoreactive and bioactive IL-6. Tumors were cultured either as explants without fetal calf serum or as dispersed cells with 10% total calf serum. Fifty-three of the 100 (53%) pituitary cultures were found to release irIL-6 and in 44 adenomas examined, 32 (72.7%) secreted bioactive IL-6. In 61 explant cultures, 30 adenomas released IL-6, indicating autonomous secretion. The amount of IL-6 released by adenomas in cell culture was generally higher, although the incidence was similar to explant cultures. IrIL-6 was released by 7 of 14 prolactinomas, 15 of 27 somatotrophinomas, 5 of 7 corticotrophinomas (including 2 Nelson's adenomas), 1 of 1 thyrotrophinomas, 2 of 2 gonadotrophinomas, and 23 of 49 clinically non-functioning adenomas. Periadenomatous tissue removed from a patient with a corticotrophinoma was found to secrete IL-6 but in much lower concentration than from the adenoma tissue. Tumor necrosis factor-alpha and -gamma-interferon were not detected in the conditioned media. Four IL-6-secreting adenomas were examined by in situ hybridization for IL-6 messenger RNA, and three of these were positive with fluorescence present throughout the tissue examined. We have provided evidence that over half of pituitary adenomas secrete IL-6 which is bioactive and that IL-6 is synthesized within the tumor by the adenoma cells.

Detecting survival effects of socioeconomic status: problems in the use of aggregate measures.

Direct measures of SES are seldom included in medical records or large databases on disease incidence or survival, forcing researchers to infer the SES characteristics of individuals from aggregate data (e.g. census tract-level income, education, etc.). This paper assesses the degree of error that results from such inference and the impact this error may have on reported relationships between SES and survival. The authors obtained both individual and census tract-level data on 536 persons diagnosed with cancer between 1980 and 1982 and monitored their survival through 1992. Pearson correlations between individual-level and census tract-level SES variables ranged between 0.2 and 0.4. Statistically significant relationships between SES and survival were observed in the models based on individual-level but not census tract-level SES data. The authors computed the degree to which inference of individual-level from census tract-level SES reduces estimates of risk ratios across SES. It appears likely that much larger numbers of observations than have been used in published studies will be needed to better understand the relationship of SES to survival and other disease outcomes.

A specialized home care intervention improves survival among older post-surgical cancer patients.

CONTEXT: Changes in the healthcare system have resulted in shortened hospital stays, moving the focus of care from the hospital to the home. Patients are discharged post-operatively with ongoing needs, and whether they receive nursing care post-hospitalization can influence their recovery and survival. Little information is available about the factors that influence outcomes, including the survival of older cancer patients after cancer surgery. OBJECTIVE: To compare the length of survival of older post-surgical cancer patients who received a specialized home care intervention provided by advanced practice nurses (APNs) with that of patients who received usual follow-up care in an ambulatory setting. We also assessed potential predictors of survival in terms of depressive symptoms, symptom distress, functional status, comorbidities, length of hospital stay, age of patient, and stage of disease. DESIGN: A randomized controlled intervention study. SETTING: Discharged older cancer patients after surgery at a Comprehensive Cancer Center in southeastern Pennsylvania. PATIENTS: Three hundred seventy-five patients aged 60 to 92, newly diagnosed with solid cancers, were treated surgically between February 1993 and December 1995. One hundred ninety patients were randomized to the intervention groups and 185 to the usual care group. INTERVENTION: The intervention was a standardized protocol that consisted of standard assessment and management post-surgical guidelines, doses of instructional content, and schedules of contacts. The intervention lasted 4 weeks and consisted of three home visits and five telephone contacts provided by APNs. Both the patients and their family caregivers received comprehensive clinical assessments, monitoring, and teaching, including skills training. MAIN OUTCOME MEASURE: Time from enrollment of patients into the study until death or last date known alive at the end of November 1996. RESULTS: During the 44-month follow-up period, 93 (24.8%) of 375 patients died. Forty-one (22%) of those who died were patients in the specialized home care intervention group, compared with 52 (28%) in the usual care group. Stage of disease at diagnosis differed between the two groups at baseline (38% late stage patients in the intervention group compared with 26% in the control group, P = .01), so stratified analysis was performed. Overall, the specialized home care intervention group was found to have increased survival (P = .002 using stratified log-rank test). Among early stage patients only, there was no difference in survival between the intervention and control groups. Among late stage patients, there was improved survival in the intervention group. For example, 2-year survival among late stage intervention group cases was 67% compared with 40% among control cases. When Cox's proportional hazard model was used to adjust for significant baseline covariates, the relative hazard of death in the usual care group was 2.04 (CI: 1.33 to 3.12; P = .001) after adjusting for stage of disease and surgical hospitalization length of stay. CONCLUSIONS: This is the first empirical study of post-surgical cancer patients to link a specialized home care intervention by advanced practice nurses with improved survival. Additional research is needed to test home care interventions aimed at maintaining quality of life outcomes and their effects on survival of post-surgical cancer patients.

Continuing care in the community.

Early discharge from the hospital or home health agency necessitates effective continuity of care planning in order to assure that patients and families will have their health care needs met after discontinuance of formal health care services. In this article, we have defined continuity of care from several perspectives, presented two theoretical viewpoints on this concept, and, with four models of care that have actually been implemented, analyzed the commonalities and differences among models. In addition, recommendations for future research and care delivery for the purpose of enhancement of continuity of care have been made.

Symptom distress, current concerns and mood disturbance after diagnosis of life-threatening disease.

This study describes the level of symptom distress, current concerns and mood disturbance in persons with a diagnosis of one of two life-threatening diseases at two occasions. The sample included 56 lung cancer patients and 65 heart attack patients who completed interviews at 1 and 2 months post diagnosis. Data were obtained using a modified version of the McCorkle and Young Symptom Distress Scale, the Weisman and Worden Inventory of Current Concerns and the Profile of Mood States. One conclusion that can be drawn from the study is that the plight of newly diagnosed lung cancer patients appears to be bleaker than that of heart attack patients. Cancer patients experienced more symptom distress of all kinds than heart attack patients. They also reported more health and existential concerns and they suffered more mood disturbances, on the average, than heart attack patients did. The most striking finding of the mean differences analysis was that, although symptom distress remained the same between occasions for both groups, both kinds of patients reported fewer concerns and better mood at the second interview. Although the plight of neither type of patient improved, patients reported being in better spirits and less worried at the second measurement occasion. This reduction in concerns and mood disturbance between interviews suggests that patients assimilate that their situation is not as immediately life-threatening as they had feared.

Psychological distress in survivors of residential fires.

This paper presents preliminary findings from an ongoing study of survivors of residential fires. The purpose of this study was to examine psychological distress and extent of loss in order to provide a psychological profile of survivors overtime. The sample (N = 69) was drawn consecutively from the database of residential fires available through the Philadelphia Fire Department. Levels of psychological distress were measured as well as reports of symptoms consistent with the diagnostic criteria for Post-traumatic Stress Disorder. The major findings indicate that residential fires caused significant and sustained distress. An agenda for further research and for services to survivors of these fires is presented.

Work disability among cancer patients.

To identify factors affecting the ability of persons with recent cancer diagnoses to remain in the labor force and retain premorbid levels of work performance, the investigators analyzed data on 247 individuals with lung, pancreatic, prostatic, or cervical cancer. Subjects were selected from a population-based tumor registry. According to Pearson correlations, ordinary least squares multiple regression, and logistic analysis, physical factors related to disease were the strongest predictors of work disability, defined as either leaving the labor force or functioning less fully at work than before becoming ill. The strongest predictors of work disability were physical dysfunction measured by the Sickness Impact Profile (SIP) and disease stage. Social background factors such as age, sex, income, and education were not statistically significant predictors. Two job characteristics, (1) physical demands of work and (2) discretion over hours worked and how much work would be done, predicted work disability, the latter appearing to help prevent this condition. Strictly disease-related factors appear more important here in predicting work disability than in studies of other diseases. Still, it appears that increasing flexibility of working hours and the pace of work could help some individuals with cancer histories remain in the labor force. Unwillingness of employers to facilitate such accommodation where technically feasible may constitute a form of discrimination against the cancer patient.

Gender bias in the measurement properties of the Center for Epidemiologic Studies Depression Scale (CES-D).

Confirmatory factor-analytic models are used to examine gender biases of individual items of the Center for Epidemiologic Studies Depression (CES-D) Scale. In samples containing 708 cancer patients and 504 caregivers of the chronically ill elderly, two CES-D items are identified as producing biased responses in comparisons of male and female respondents. Three additional CES-D items are excluded on the basis of other psychometric problems, yielding a subset of 15 CES-D items that capture almost all the information of the original 20-item CES-D scale but are free of any gender bias. Gender differences in mean levels of depressive symptomatology are significantly reduced, but not eliminated, when the 15-item scale is used.

Ultrastructure of hydrated proteoglycans using a pulsed plasma source.

During the past 10 years, attempts have been made to examine hydrated biological specimens by using wet chambers (at ambient temperature) [1-3] or cold stages (at -30 degrees C and below) during electron microscopic examination. Obtaining sufficient contrast of unstained hydrated biological samples has proven a considerable problem using both of these methods. Many fragile biological specimens, when examined hydrated, frozen or dried, are severely damaged by the electron beam and cannot be imaged by conventional scanning or transmission electron microscopy. In order to increase specimen contrast and eliminate electron beam induced trauma to the specimen, we have developed a wet-cell [4], which when used in concert with a pulsed plasma soft X-ray source, provides high contrast contact replicas of totally hydrated, unstained biological specimens. Although it has been postulated that hydrated unstained samples can be imaged by soft X-ray contact microscopy [5-7], to date there has been little success due to cell movement or degradation of the wet sample during the long exposure period necessary for an adequate imaging dose [8]. With the pulsed plasma source described in this study we have been able to use exposure times of approximately 40-60 ns while maintaining the sample in its hydrated state at atmospheric pressure. The resultant contact replicas exhibit good contrast and better than 30 nm spatial resolution when examined by conventional scanning electron microscopy.

Development and validation of a telephone questionnaire to characterize lymphedema in women treated for breast cancer.

BACKGROUND AND PURPOSE: Accurate and economical characterization of lymphedema is needed for population-based studies of incidence and risk. The purpose of this study was to develop and validate a telephone questionnaire for characterizing lymphedema. SUBJECTS: Forty-three women who were treated previously for breast cancer and who were recruited from physical therapy practices and a cancer support organization were studied. METHODS: Questionnaire assessment of the presence and degree of lymphedema was compared with physical therapists' diagnoses, based primarily on circumferential measurements. Twenty-five of the 43 subjects were measured independently by 2 physical therapists to assess interobserver agreement. RESULTS: Interobserver agreement on clinical assessments of the presence and degree of lymphedema was high (20/25, weighted kappa=.80); all of the disagreements were between judgments of whether there was no lymphedema or mild lymphedema. For the diagnosis of at least moderate lymphedema (differential in the circumferences of the upper extremities greater than 2 cm), sensitivity of the questionnaire varied from 0.86 to 0.92 and specificity was 0.90. However, sensitivity (varying from 0.93 to 0.96) was higher than specificity (varying from 0.69 to 0.75) for the diagnosis of any lymphedema. DISCUSSION AND CONCLUSION: A few straightforward questions exhibited excellent agreement with physical therapists' assessments for identifying at least moderate lymphedema.

A cancer nursing curriculum guide for baccalaureate nursing education.

Cancer is a leading cause of morbidity and mortality in the United States, affecting one of four Americans. Many nurses without specialized oncology preparation will provide counsel and care for people at risk for or with cancer. In recognition of the cancer-related educational needs for all nurses in the wide variety of health care settings, the American Cancer Society Professors of Oncology Nursing provide a curriculum guide for core cancer nursing content in undergraduate education for baccalaureate students. It is intended to assist educators to define expectations for clinical competencies in cancer care for preparing graduates at the baccalaureate level. A variety of educational strategies and resources for the educator are suggested to facilitate integration of cancer content within existing programs.

Choosing a master's program in cancer nursing in the United States.

Returning to school to obtain a master's degree in cancer nursing in the United States is an undertaking that requires much thought. Going to school is an investment in oneself and, like any investment, many questions must be addressed before taking the step. Questions such as "Why go to school?" and "When to go?" need to be answered. The question "How will I pay for my education?" also needs to be answered. "Where to go to school?" often is the most difficult question. This article offers you some things to think about and some questions to ask when trying to choose a graduate program. In the final analysis, you will need to determine what is important to you and what school can best meet your personal needs to fulfill your professional goals.

Relaxation training and psychoimmunological status of bereaved spouses. A pilot study.

The death of a family member is one of the most stressful and disruptive life events. Although the literature abounds with subjective pieces concerning bereavement, little is known about the complex biological processes that follow in its wake. However, there is a growing body of evidence that psychological distress may compromise immunocompetence and that support strategies may enhance immune function. Our exploratory study examined the influence of relaxation training on the immunological and psychological status (including anxiety and depression) of bereaved spouses. Nine female spouses, all survivors of patients who died from cancer, were recruited from two hospice programs to participate in this relaxation-training program. Standardized psychological instruments and immunological assays were completed at three data-collection points: before the initiation of the relaxation training (approximately 6 weeks after the death of the spouse); at the conclusion of the training; and 4 weeks after the relaxation training. The subjects received a 1-h relaxation-training program weekly for 4 weeks. It included progressive muscle relaxation training and guided imagery supervised by a psychiatric nurse clinical specialist. The results indicated that the relaxation-training program was well-received by the subjects, with promising psychoimmunological trends that merit more rigorous investigation. This exploratory study has demonstrated the feasibility of conducting a relaxation-training intervention for bereaved spouses and has laid the foundation for continuing research to study the physiological and psychological responses of the bereaved.

Cancer prevention education in developing countries: toward a model for nurse educators.

The National Cancer Institute, United States of America, funded a series of continuing education courses in cancer prevention between 1986 and 1994 for nurses from developing countries. The purpose of this program was to stimulate interest and facilitate an increase in the participants' knowledge of primary and secondary cancer prevention. The long-term objectives were to increase the number of nurses, internationally, prepared to engage in the prevention and the early detection of cancer in their countries, to expand the international cancer nursing network, and to have these nurses ultimately play a role in reducing the incidence of cancer in developing countries. More than 50 nations were represented. Participants were chosen for their demonstrated ability to influence nursing education and practice in their country. They completed a demographic data sheet, an attitude inventory, a program evaluation and pre- and postconference activities surveys. Before and after attending the conference, participants were asked to identify anticipated problems and obstacles to their goal achievement. These problems included a lack of screening facilities and a lack of primary prevention services. Although numerous differences existed in their education, experience, and personal attributes, the participants voiced common problems with cancer prevention programs. Results from the postconference survey showed a substantial increase in cancer-related activities conducted by the participants. Activities included an increase in cancer content in nursing education programs, an increase in public and professional presentations on cancer prevention, and improvement in the delivery of cancer care.

Participant characteristics before and 4 months after attendance at a family caregiver cancer education program.

Recent trends in health care have placed an increased burden on cancer caregivers. In response, nurses and social workers have been taught to implement a 6-hour psychoeducation program for cancer caregivers that addresses symptom management, psychosocial support, and resource identification. Longitudinal data from a convenience sample of 187 cancer caregivers who attended the program are reported. Data were collected before attendance and 4 months later. Findings confirm the chronic and consuming nature of cancer caregiving. Data indicate that perception of burden did not worsen even when caregiving tasks increased in intensity. Caregiver perceptions of their own health actually improved over time. In addition, the number of caregivers who said they were well informed and confident about caregiving after program attendance increased over time. Further study that randomizes caregivers to intervention/control groups is needed to substantiate the role of similar programs in enhancing caregiver skills and minimizing caregiver burden over time.

Measurement of stress in clinical nursing.

The Nurse Stress Checklist was developed to measure stress in clinical nursing as a multidimensional construct. The instrument was formulated within a transactional model of stress. The items were derived from five domains thought to contribute to nurse stress in clinical settings and were organized into a questionnaire. Holmes Schedule of Recent Events was included as a validity measure. The instrument was tested on 104 staff nurses working in three institutions in an urban community. Exploratory factor analysis was applied to the 74 items presented to subjects in Likert-type format. Five factors were derived and subjected to psychometric evaluation. Internal consistency reliability for the five factors was good, ranging from 0.80 to 0.91. Means and measures of dispersion supported the potential of the five subscales to discriminate among respondents on the attributes being measured. Intercorrelations of the factors provided evidence of the distinctiveness of the five components of stress, although factor loadings showed some overlap between Personal Reactions and Work Concerns and Work Concerns and Work Completion Concerns. Validity of the factors also was supported by correlations with Holmes' Schedule of Recent Events. Content validity was supported by comparison of these results with findings of other investigators. Limitations of the results are discussed, and recommendations for future work on the instrument are offered.

Gaps and contract: evaluating the diffusion of new information. Part I. A description of the strategy.

Time and fiscal constraints on oncology nurses require that continuing education programs yield demonstrable benefit to the clinician, the institution, and patient outcomes. This article describes "gaps and contract," a strategy that provides nurses with a tool to transfer knowledge from theory to practice, in a measurable form. The framework for this strategy lies within the concept of innovation diffusion. This strategy was used by two universities collaborating to educate 912 oncology health professionals in 38 continuing education programs. Part II of this article will describe the measurement of this strategy.

Gaps and contract: evaluating the diffusion of new information. Part II. The measurement of the strategy.

This article is the second of a two-part series describing "gaps and contract," a strategy that provides nurses with a mechanism to transfer knowledge from theory into practice in a measurable format. Two universities under contract from the Pennsylvania state cancer plan used this strategy to evaluate the effectiveness of a cancer continuing education program. Two hundred seventy-four (274) contracts from one setting and 205 from a second setting are described. Recommendations for using this strategy to measure the efficacy of cancer continuing education programs are included.