Publications

Abstract

Objectives: To investigate the arachidonate 5-lipoxygenase-activating protein (ALOX5AP) gene as a potential modifier gene for coronary heart disease (CHD) in patients with familial hypercholesterolemia (FH). Background: The ALOX5AP gene is required for the synthesis of leukotrienes, a protein family involved in inflammatory responses. Recently, genetic variation in this gene was shown to be associated with myocardial infarction in an Icelandic and British population. Since FH is characterized by severely increased levels of plasma low-density lipoprotein (LDL) cholesterol levels, chronic inflammation of the arterial wall, and subsequent premature CHD, the ALOX5AP gene could be an important modifier gene for CHD in FH. Methods: In a cohort of 1817 FH patients, we reconstructed two four-marker haplotypes, previously defined in Icelandic (HapA) and British (HapB) individuals. The haplotypes were inferred with PHASE and the associations between the haplotypes and CHD were analyzed with a Cox proportional hazards model, adjusted for year of birth, sex, and smoking. Results: HapB had a frequency of 6.9% and 8.2% in the group without and with CHD, respectively, conferring a hazard ratio of 1.48 (95% CI 1.17-1.89, p = 0.001). This association was predominantly found in patients with LDL cholesterol levels above the median (HR 1.82, 95% CI 1.20-2.76, p = 0.005). HapA was not associated with CHD. Conclusion: We conclude that genetic variation in the ALOX5AP gene contributes to CHD risk in patients with FH. Our findings emphasize the important role of inflammation in the pathogenesis of early CHD in this disorder, particularly in patients with more severely raised LDL cholesterol levels.

Abstract

Objective: Heart failure (HF) self-care requires both knowledge and skill, but little attention has been given to identify how to improve skill in HF self-care. The objective was to assess what self-care skills patients with HF perceive that they need and how they developed the skills needed to perform self-care. Methods: Data from 85 adults with chronic HF enrolled in 3 prior studies were analyzed using qualitative descriptive meta-analysis techniques. Themes were reexamined using within study and across-study analyses and translated to create a broader and more complete understanding of the development of skill in HF self-care. Results: Tactical and situational skills are needed to perform adequate self-care. Skill in self-care evolves over time and with practice as patients learn how to make self-care practices fit into their daily lives. Proficiency in these skills was acquired primarily through input from family and friends. Health care professionals rarely made significant contributions to the learning of essential skills. Conclusion: Traditional patient education does not support self-care skill development in patients with HF. New patient teaching strategies are needed that support the development of tactical and situational skills, foster coherence, and use trusted resources. Research testing coaching interventions that target skill-building tactics, such as role-playing in specific situations, are needed.

Abstract

Objective: To evaluate the relationships between the amount and type of dietary fat and intermediate age-related macular degeneration (AMD). Design: Women aged 50 to 79 years with high and low lutein intake from 3 sites of the Women's Health Initiative Observational Study were recruited into the Carotenoids in Age-Related Eye Disease Study. Fat intake from 1994 through 1998 was estimated using food frequency questionnaires, and AMD was assessed photographically from 2001 through 2004. Results: Intakes of ω-6 and ω-3 polyunsaturated fatty acids, which were highly correlated (r=0.8), were associated with approximately 2-fold higher prevalence of intermediate AMD in high vs low quintiles. However, monounsaturated fatty acid intake was associated with lower prevalence. Age interactions were often observed. In women younger than 75 years (n=1325), total fat and saturated fatty acid intakes were associated with increased prevalence of AMD (multivariate adjusted odds ratios [95% confidence interval] for intermediate AMD, 1.7 [1.0-2.7] for quintile 5 vs quintile 1 for total fat [P=.10 for trend] and 1.6 [0.7-3.6] for saturated fatty acids [P=.23 for trend]). The associations were reversed in older women. Conclusions: These results support a growing body of evidence suggesting that diets high in several types of fat may contribute to the risk of intermediate AMD and that diets high in monounsaturated fatty acids may be protective.

Abstract

Background: Transforming growth factor ß (TGFß) signaling has been shown to promote myocardial fibrosis and remodeling with coronary artery disease (CAD), and previous studies show a major role for fibrosis in the initiation of malignant ventricular arrhythmias (VA) and sudden cardiac arrest (SCA). Common single nucleotide polymorphisms (SNPs) in TGFß pathway genes may be associated with SCA. Objective: We examined the association of common SNPs among 12 candidate genes in the TGFß pathway with the risk of SCA. Methods: SNPs (n = 617) were genotyped in a case-control study comparing 89 patients with CAD and SCA caused by VA to 520 healthy control subjects. Results: Nineteen SNPs among 5 genes (TGFB2, TGFBR2, SMAD1, SMAD3, SMAD6) were associated with SCA after adjustment for age and sex. After permutation analysis to account for multiple testing, a single SNP in TGFBR2 (rs9838682) was associated with SCA (odds ratio: 1.66, 95% confidence interval: 1.08 to 2.54, P = .02). Conclusion: We show an association between a common TGFBR2 polymorphism and risk of SCA caused by VA in the setting of CAD. If validated, these findings support the role of genetic variation in TGFß signaling in SCA susceptibility.

Abstract

Purpose:To examine perceptions about aging well in the context of cognitive health among a large and diverse group of older adults.Design and Methods:Forty-two focus groups were conducted with older adults living in the community (N = 396; White, African American, American Indian, Chinese, Vietnamese, and Hispanic). Participant descriptions of "someone who you think is aging well" were analyzed. Constant comparison methods examined themes by race/ethnicity.Results:There were notable race/ethnicity differences in perceptions of aging well. Compared with other racial/ethnic groups Chinese participants were more likely to emphasize relationships between mental outlook and physical abilities, Vietnamese participants were less likely to emphasize independent living. American Indians did not relate aging well to diet or physical activity. Important themes that emerged about aging well for all racial/ethnic groups were as follows: living to advanced age, having good physical health, having a positive mental outlook, being cognitively alert, having a good memory, and being socially involved.Implications:To promote cognitive health among diverse populations, communication strategies should focus on shared perceptions of aging well, such as living to an advanced age with intact cognitive function, having a positive attitude, and being mobile. Health promotions may also create a range of culturally sensitive messages, targeted to views that are more salient among some racial/ethnic groups.

Abstract

Context Coronary artery disease (CAD) is the major cause of mortality and morbidity in patients with type 2 diabetes. But the utility of screening patients with type 2 diabetes for asymptomatic CAD is controversial. Objective To assess whether routine screening for CAD identifies patients with type 2 diabetes as being at high cardiac risk and whether it affects their cardiac outcomes. Design, Setting, and Patients The Detection of Ischemia in Asymptomatic Diabetics (DIAD) study is a randomized controlled trial in which 1123 participants with type 2 diabetes and no symptoms of CAD were randomly assigned to be screened with adenosine-stress radionuclide myocardial perfusion imaging (MPI) or not to be screened. Participants were recruited from diabetes clinics and practices and prospectively followed up from August 2000 to September 2007. Main Outcome Measure Cardiac death or nonfatal myocardial infarction (MI). Results The cumulative cardiac event rate was 2.9% over a mean (SD) follow-up of 4.8 (0.9) years for an average of 0.6% per year. Seven nonfatal MIs and 8 cardiac deaths (2.7%) occurred among the screened group and 10 nonfatal MIs and 7 cardiac deaths (3.0%) among the not-screened group (hazard ratio [HR], 0.88; 95% confidence interval [CI], 0.44-1.88; P=.73). Of those in the screened group, 409 participants with normal results and 50 with small MPI defects had lower event rates than the 33 with moderate or large MPI defects; 0.4% per year vs 2.4% per year (HR, 6.3; 95% CI, 1.9-20.1; P=.001). Nevertheless, the positive predictive value of having moderate or large MPI defects was only 12%. The overall rate of coronary revascularization was low in both groups: 31 (5.5%) in the screened group and 44 (7.8%) in the unscreened group (HR, 0.71; 95% CI, 0.45-1.1; P=.14). During the course of study there was a significant and equivalent increase in primary medical prevention in both groups. Conclusion In this contemporary study population of patients with diabetes, the cardiac event rates were low and were not significantly reduced by MPI screening for myocardial ischemia over 4.8 years. Trial Registration clinicaltrials.gov Identifier: NCT00769275

Abstract

Goals of work: The goals of the study were to determine the occurrence rates for and the severity of symptoms at the middle, end, and 1 month after the completion of radiation therapy (RT), to determine the number and types of symptom clusters at these three time points, and to evaluate for changes over time in these symptom clusters. Materials and methods: Symptom occurrence and severity were evaluated using the Memorial Symptom Assessment Scale (MSAS) in a sample of patients (n∈=∈160) who underwent RT for breast or prostate cancer. At each time point, an exploratory factor analysis was done to determine the number of symptom clusters (i.e., symptom factors) based on the MSAS symptom severity ratings. Main results: The majority of the patients were male and married with a mean age of 61.1 years. The five symptoms with the highest occurrence rates across all three time points were lack of energy, pain, difficulty sleeping, feeling drowsy, and sweats. Although the number of symptoms and the specific symptoms within each symptom cluster were not identical across the three time points, three relatively similar symptom clusters (i.e., "mood-cognitive" symptom cluster, "sickness-behavior" symptom cluster, "treatment-related", or "pain" symptom cluster) were identified in this sample. The internal consistency coefficients for the mood-cognitive symptom cluster and sickness-behavior symptom cluster were adequate at ≥ 0.68. Conclusions: Three relatively stable symptom clusters were found across RT. The majority of the symptom cluster severity scores were significantly higher in patients with breast cancer compared to patients with prostate cancer.

Abstract

Purpose: To describe how nurses would respond in common clinical situations involving disagreement with physician colleagues during labor and birth. Study Design and Methods: An electronic survey, consisting of five clinical disagreement case scenarios along with two open-ended questions regarding how to promote effective interdisciplinary communication and collaboration, was administered via a secure Web site. Seven hundred four obstetric nurses in a mid-size metropolitan area were invited to participate via mail. One hundred thirty-three nurses responded. Data were analyzed using descriptive statistics and thematic analysis of open-ended text responses. Results: Respondents were primarily aged ≥40, experienced in labor nursing, and held a BSN; 35% were members of the Association of Women's Health, Obstetric and Neonatal Nurses, 35% were certified in electronic fetal monitoring, and 33% were certified in inpatient obstetrics. In all five scenarios, most nurses were aware of current evidence and published standards of care (range 52%-86%). However, there was a wide discrepancy between current evidence/standards and what nurses indicated would occur in actual clinical practice. Clinical Implications: In this well-educated and knowledgeable sample of experienced labor nurses, reports of what would occur in clinical practice did not match current evidence or standards of care. Adequate nursing knowledge may not be an accurate predictor of appropriate clinical practice. Confidence in administrative support appears to be one of the key factors in empowering nurses to pursue resolution of disagreements in patients' best interests, whereas medical hierarchy, fear, and intimidation are significant barriers.

Abstract

Concurrent sexual partnerships may help to explain the disproportionately high prevalence of HIV and other sexually transmitted infections among African Americans. The persistence of such disparities would also require strong assortative mixing by race. We examined descriptive evidence from 4 nationally representative US surveys and found consistent support for both elements of this hypothesis. Using a data-driven network simulation model, we found that the levels of concurrency and assortative mixing observed produced a 2.6-fold racial disparity in the epidemic potential among young African American adults.

Abstract

Aims: To compare insulin sensitivity (Si) in adults at risk for type 2 diabetes (T2DM) who were categorized as non-depressed, treated for depression and untreated depression after controlling for physical activity (PA). Methods: Baseline data was analyzed from individuals enrolled in a diabetes prevention program (n = 56). Si was calculated using the whole-body insulin sensitivity method. The Centers for Epidemiologic Studies Depression Scale (CESD) was used to assess depressive symptoms and depressed cases were identified using a cutoff of ≥16. Depression treatment was identified using a self-report form validated by medical chart review. The PA subscale of the Health Promoting Lifestyle Profile was used to determine PA levels. Results: One third of participants had elevated depressive symptoms; 19% were taking antidepressant medication. Mean Si was 3.1 (±1.9). In ANOVA, depressed individuals showed significantly lower Si (M = 1.8 ± 0.9) than non-depressed individuals (M = 3.4 ± 1.8). However, individuals taking antidepressant medications had Si similar to non-depressed individuals (M = 3.7 ± 2.3: p = .63). In ANCOVA this association remained after controlling for PA. Conclusions: These data suggest that in adults at high risk for T2DM, depression treatment may improve insulin resistance observed in depression. Healthcare practitioners are encouraged to screen, treat, or refer their patients with depression for treatment.

Abstract

Introduction: Descriptive study compared adolescent mothers' subjective perceptions of their children's development with objective developmental assessments. Methods: A volunteer sample of mother/child pairs was recruited from an urban high school. Thirty-three mothers completed the Ages and Stages Questionnaire (A&SQ). The Bayley Scales of Infant Development (BSID) was administered to children. Results: On the BSID, group mean scores all fell within the normal range. However, almost 20% of individual children had one or more delays. Almost 73% of mothers accurately assessed their children's development on the A&SQ when compared with BSID results. Eighteen percent of mothers suspected delays when no delays were objectively identified. A single mother identified delay in a different domain than that identified on the BSID. Discussion: Findings that almost 20% of these children had developmental delays support other research that children of adolescent mothers are at risk for delays. Findings that teen mothers varied in their abilities to assess their children's development reinforce the need for education of teen mothers about child development. Further study is needed to determine the best models of this education in school and community settings.

Abstract

The purposes of this study were to identify the number and types of symptom clusters using yes/no responses from the Memorial Symptom Assessment Scale, identify the number and types of symptom clusters using severity scores from the Memorial Symptom Assessment Scale, compare the identified symptom clusters derived using severity scores to those derived using occurrence ratings, and evaluate for differences in symptom cluster severity scores between patients with breast and prostate cancer at the end of radiation therapy. Separate exploratory factor analyses were performed to determine the number of symptom clusters based on symptom occurrence rates and symptom severity ratings. Although specific symptoms within each symptom cluster were not identical, 3 very similar symptom clusters (ie, "mood-cognitive" symptom cluster, "sickness-behavior" symptom cluster, "treatment-related" symptom cluster) were identified regardless of whether occurrence rates or severity ratings were used to create the symptom clusters at the end of radiation therapy. However, the factor solution derived using the severity ratings fit the data better. Significant differences in severity scores for all 3 symptom clusters were found between patients with breast and prostate cancer. For all 3 symptom clusters, the patients with breast cancer had higher symptom cluster severity scores than the patients with prostate cancer.

Abstract

Mathematical models are increasingly used in social and behavioral studies of HIV transmission; however, model structures must be chosen carefully to best answer the question at hand and conclusions must be interpreted cautiously. In Pearson et al. (2007), we presented a simple analytically tractable deterministic model to estimate the number of secondary HIV infections stemming from a population of HIV-positive Mozambicans and to evaluate how the estimate would change under different treatment and behavioral scenarios. In a subsequent application of the model with a different data set, we observed that the model produced an unduly conservative estimate of the number of new HIV-1 infections. In this brief report, our first aim is to describe a revision of the model to correct for this underestimation. Specifically, we recommend adjusting the population-level sexually transmitted infection (STI) parameters to be applicable to the individual-level model specification by accounting for the proportion of individuals uninfected with an STI. In applying the revised model to the original data, we noted an estimated 40 infections/1000 HIV-positive persons per year (versus the original 23 infections/1000 HIV-positive persons per year). In addition, the revised model estimated that highly active antiretroviral therapy (HAART) along with syphilis and herpes simplex virus type 2 (HSV-2) treatments combined could reduce HIV-1 transmission by 72% (versus 86% according to the original model). The second aim of this report is to discuss the advantages and disadvantages of mathematical models in the field and the implications of model interpretation. We caution that simple models should be used for heuristic purposes only. Since these models do not account for heterogeneity in the population and significantly simplify HIV transmission dynamics, they should be used to describe general characteristics of the epidemic and demonstrate the importance or sensitivity of parameters in the model.

Abstract

Objective: Women with gynecological cancers have reported poor health-related quality of life (QOL), with complex physical and psychological needs post-surgery and during chemotherapy treatment. There are no studies reporting interventions addressing these needs post-hospital discharge in this population. Methods: Patients were randomized into two groups. The intervention group received 6 months of specialized care by an Advanced Practice Nurse (APN); in addition, women with high distress were evaluated and monitored by a psychiatric consultation-liaison nurse (PCLN). The attention control group was assisted with symptom management by a research assistant. The effects of the 6-month intervention were evaluated using self-report questionnaires at baseline (24-48 h after surgery), 1, 3, and 6 months post- surgery. QOL assessments included the Center for Epidemiological Studies-Depression Scale, the ambiguity subscale of the Mishel Uncertainty in Illness Scale, the Symptom Distress Scale, and the Short-Form Health Survey (SF-12). The sample for the longitudinal analysis included 123 who completed QOL outcome measures across three occasions post-surgery. Results: The APN intervention resulted in significantly less uncertainty than the attention control intervention 6 months after surgery. When the sub-group who received the APN plus PCLN intervention was compared with the total attention control group, the sub-group had significantly less uncertainty, less symptom distress, and better SF-12 mental and physical QOL over time. Conclusion: Nurse tailored interventions that target both physical and psychological aspects of QOL in women recovering from cancer surgery and undergoing chemotherapy produce stronger outcomes than interventions that target solely one QOL aspect.

Abstract

The objective of this study was to analyze the net effects of nurse practice environments on nurse and patient outcomes after accounting for nurse staffing and education. Background: Staffing and education have welldocumented associations with patient outcomes, but evidence on the effect of care environments on outcomes has been more limited. Methods: Data from 10,184 nurses and 232,342 surgical patients in 168 Pennsylvania hospitals were analyzed. Care environments were measured using the practice environment scales of the Nursing Work Index. Outcomes included nurse job satisfaction, burnout, intent to leave, and reports of quality of care, as well as mortality and failure to rescue in patients. Results: Nurses reported more positive job experiences and fewer concerns with care quality, and patients had significantly lower risks of death and failure to rescue in hospitals with better care environments. Conclusion: Care environment elements must be optimized alongside nurse staffing and education to achieve high quality of care.

Abstract

The purpose of this article was to provide a comprehensive review of the epidemiological and genetic factors associated with ovarian cancer. A more complete understanding of the determinants of ovarian cancer may lead to the development of better screening and detection methods for this disease. The first section of this article reviews current literature on screening and early detection of ovarian cancer. The second section reviews the epidemiology of ovarian cancer, specifically highlighting the risk factors associated with the development of this disease. The article concludes with a discussion of how oncology nurses can apply this information to improve patient care.