Student-led Doctor of Nursing Practice projects in the clinical environment: Viewpoint from hospital-based nurse scientists and leaders.

BACKGROUND: Exponential increases in Doctor of Nursing Practice (DNP) program enrollment have come with a rapid rise in the number of capstone projects conducted in clinical environments. However, misaligned priorities between students, faculty, and clinician leaders have created significant challenges. PURPOSE: Identify opportunities to strengthen collaboration between academic and clinical stakeholders to better support DNP projects and education. METHODS: Experienced hospital-based nurse leaders engaged in scholarly discourse supplemented by policy and research in DNP education. FINDINGS: Facilitating a DNP project requires significant investment of time, resources, and funds from the healthcare institution. Discord has arisen due to unclear responsibilities or decision-making ability for clinical stakeholders, ethical dilemmas for students who are also employees of the clinical site, and mismatched priorities between clinical need and student/academic project desires. Clinical leaders have raised significant concerns about DNP project proposals that are research-focused, diverge from healthcare institution goals, and lack a sustainability plan. DISCUSSION: Fortification of academic-practice partnerships and clarification of roles in the DNP student project are necessary to ensure that the project is of educational value to the student, a demonstration of learning for faculty, and of sustained clinical value to the healthcare system.

Strategies to improve communication about neurocognitive impacts in pediatric oncology: Quality improvement findings.

BACKGROUND: Neurocognitive deficits are common among children who receive central nervous system (CNS)-directed therapy for childhood cancer. Parents report that they lack information from and communication with oncology providers about neurocognitive impacts of therapy. Furthermore, oncology providers report they lack training and institutional support to appropriately address the neurocognitive needs of these patients/families. METHODS: A parent/provider stakeholder informed, quality improvement (QI) project was conducted to educate providers about neurocognitive impacts, increase parent/provider communication, and improve adherence to supportive care guidelines for neuropsychological assessment for children receiving CNS-directed therapy. A 1-h Continuing Medical Education (CME) course was developed to educate providers about neurocognitive impacts and their relation to schooling. A provider-focused electronic medical record (EMR) strategy was used to deliver parent stakeholder-informed return-to-school "roadmaps," with prompts to scaffold parent/provider communication and enhance documentation of findings. RESULTS: Hospital-based CME sessions were attended by 76% (41 out of 54) of providers from our institution. Among the 34 who completed both pretest and posttest, the mean knowledge score improved from 56% at pretest to 74% at posttest. Compliance with the EMR strategy was 80% and there was a 42% increase in neuropsychological assessment referrals. CONCLUSIONS: We conclude that this QI project is an example of a successful parent/provider stakeholder collaboration that achieved demonstrable positive change in the areas of provider knowledge, patient/provider communication, and alignment of neuropsychological assessment referrals with existing guidelines. Our results confirm that improving knowledge, communication, and compliance with neuropsychological standards of care is possible with this evidence-based approach.

Dose-limiting mucositis: friend or foe?

Dose-limiting toxicities are ubiquitous to cancer-directed therapy, presenting with severity to a degree that necessitates therapy de-escalation, pause, or discontinuation. To date, there is incredible limited understanding if these therapy de-escalations present risk for survival by limiting delivery of intensive therapy, or if they indicate physiologic susceptibility and are a favorable prognostic indicator. Mucositis is an excellent illustration of the current paradox of dose-limiting toxicities-it has existed alongside therapy for eight decades, but despite its presence, there is an incomplete understanding of how it develops, why it varies between oncologic populations, and if it relates to cancer survival. Rigorous methodologic approaches in symptom science holds potential to better understand mucositis, to determine if it is a marker of response or threat, and evaluate if it holds potential to guide therapy delivery.

Clinical trial participation predicts improved survival in older adults receiving allogeneic blood and marrow transplant.

BACKGROUND: Older adults represent a large oncologic demographic and are under-represented within oncology research despite constituting nearly two-thirds of the oncologic population in the United States. Because many social factors influence research participation, those who enroll in research do not reflect the oncology population at large, introducing bias and creating issue with external validity of studies. The same factors that influence study enrollment may also impact cancer outcomes, meaning that those who enroll in studies may already have an improved chance of cancer survival, further skewing results of these studies. This study evaluates characteristics that influence study enrollment in older adults and explore to what degree these factors may influence survival after allogeneic blood or marrow transplantation. METHODS: This retrospective comparison study evaluates 63 adults aged 60 and above undergoing allogenic transplantation at one institution. Patients who elected and declined enrollment in a non-therapeutic observational study were evaluated. Demographic and clinical characteristics between groups were compared and assessed as predictors of transplant survival, including decision to enroll in the study. RESULTS: Participants who chose to enroll in the parent study were not different with regard to gender, race/ethnicity, age, insurance type, donor age, and neighborhood income/poverty level compared to patients who were invited to participate but declined enrollment. The research participant group had higher proportion assessed as being fully active (23.8% vs. 12.7%, p = 0.034) and lower mean comorbidity scores (1.0 vs 2.47, p = 0.008). Enrollment in an observational study independently predicted transplant survival (HR = 0.316, 95% CI 0.12-0.82, p = 0.017). When controlling for relevant confounders of disease severity, comorbidities, and transplant age, enrolling in the parent study was associated with a lower hazards of death following transplant (HR = 0.302, 95% CI 0.10-0.87, p = 0.027). CONCLUSIONS: Despite being demographically comparable, persons who enrolled in one non-therapeutic transplant study had significantly improved survivorship than those who did not participate in observational research. These findings suggest that there are unidentified factors that influence study involvement that may also impact disease survivorship, over-estimating outcomes from these studies. Results from prospective observational studies should be interpreted with the consideration that study participants have an improved chance of survival at baseline.

Leveraging gene expression subgroups to classify DLBCL patients and select for clinical benefit from a novel agent.

Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous disease, commonly described by cell-of-origin (COO) molecular subtypes. We sought to identify novel patient subgroups through an unsupervised analysis of a large public dataset of gene expression profiles from newly diagnosed de novo DLBCL patients, yielding 2 biologically distinct subgroups characterized by differences in the tumor microenvironment. Pathway analysis and immune deconvolution algorithms identified higher B-cell content and a strong proliferative signal in subgroup A and enriched T-cell, macrophage, and immune/inflammatory signals in subgroup B, reflecting similar biology to published DLBCL stratification research. A gene expression classifier, featuring 26 gene expression scores, was derived from the public dataset to discriminate subgroup A (classifier-negative, immune-low) and subgroup B (classifier-positive, immune-high) patients. Subsequent application to an independent series of diagnostic biopsies replicated the subgroups, with immune cell composition confirmed via immunohistochemistry. Avadomide, a CRL4CRBN E3 ubiquitin ligase modulator, demonstrated clinical activity in relapsed/refractory DLBCL patients, independent of COO subtypes. Given the immunomodulatory activity of avadomide and the need for a patient-selection strategy, we applied the gene expression classifier to pretreatment biopsies from relapsed/refractory DLBCL patients receiving avadomide (NCT01421524). Classifier-positive patients exhibited an enrichment in response rate and progression-free survival of 44% and 6.2 months vs 19% and 1.6 months for classifier-negative patients (hazard ratio, 0.49; 95% confidence interval, 0.280-0.86; P = .0096). The classifier was not prognostic for rituximab, cyclophosphamide, doxorubicin, vincristine, prednisone or salvage immunochemotherapy. The classifier described here discriminates DLBCL tumors based on tumor and nontumor composition and has potential utility to enrich for clinical response to immunomodulatory agents, including avadomide.

Causes and consequences of differences in soil and seed microbiomes for two alpine plants.

Seed and soil microbiomes strongly affect plant performance, and these effects can scale-up to influence plant community structure. However, seed and soil microbial community composition are variable across landscapes, and different microbial communities can differentially influence multiple plant metrics (biomass, germination rate), and community stabilizing mechanisms. We determined how microbiomes inside seeds and in soils varied among alpine plant species and communities that differed in plant species richness and density. Across 10 common alpine plant species, we found a total of 318 bacterial and 128 fungal operational taxonomic units (OTUs) associated with seeds, with fungal richness affected by plant species identity more than sampling location. However, seed microbes had only marginally significant effects on plant germination success and timing. In contrast, soil microbes associated with two different plant species had significant effects on plant biomass, and their effect depended both on the plant species and the location the soils were sampled from. This led to significant changes in plant-soil feedback at different locations that varied in plant density and richness, such that plant-soil feedback favored plant species coexistence in some locations and opposed coexistence at other locations. Importantly, we found that coexistence-facilitating feedback was associated with low plant species richness, suggesting that soil microbes may promote the diversity of colonizing plants during the course of climate change and glacial recession.

Anti-inflammatory mouthwashes for the prevention of oral mucositis in cancer therapy: an integrative review and meta-analysis.

PURPOSE: Mucositis is severely painful and often reported as one of the most distressing adverse effects of cancer therapy; it is a significant threat to quality of life as well as life itself. Anti-inflammatory agents may modulate physiologic mechanisms that perpetuate mucositis and be useful in prevention efforts. Because systemic anti-inflammatory agents are not appropriate for many patients, locally acting agents (mouthwashes) may be more feasible for use. This review and meta-analysis evaluates the role that anti-inflammatory mouthwashes have in preventing or reducing oral mucositis associated with chemotherapy and radiation therapy. METHODS: A systematic literature review was conducted to identify studies evaluating the efficacy of anti-inflammatory mouthwashes to prevent therapy-associated mucositis. Meta-analysis was conducted to determine efficacy in preventing any mucositis and dose-limiting mucositis. RESULTS: Eight peer-reviewed publications were identified; corticosteroid and nonsteroidal anti-inflammatory mouthwashes are effective in reducing overall incidence of mucositis and are associated with lower severity of mucositis. Meta-analysis reveals significant reduction in symptomatic mucositis incidence (OR 6.00, 95% CI 4.39-8.20, p < 0.0001) and reduction of dose-limiting mucositis (OR 2.12, 95% CI 1.07-4.28, p = 0.032). CONCLUSION: Mouthwashes containing anti-inflammatory agents are a potential effective means to prevent or reduce mucositis associated with cancer therapy. There are limited adverse effects from these agents, and adherence is high, indicating safety and feasibility of use. Anti-inflammatory mouthwashes should be considered for supportive care in persons at risk for mucositis and must be further evaluated to investigate efficacy across multiple chemotherapy agents, adverse effects, and impacts on symptoms, pain, and quality of life.

Childhood Cancer Survivors and Distance Education Challenges: Lessons Learned From the COVID-19 Pandemic.

OBJECTIVE: Pediatric cancer survivors have historically struggled to receive adequate educational supports. In Spring 2020, the COVID-19 pandemic forced an emergency switch from traditional in-person education models to distance education, but little information is available regarding experiences of pediatric survivors' coping with schooling since that time. METHODS: This article presents exploratory mixed methods findings from a quality improvement project including qualitative interviews and a quantitative survey conducted with parents of pediatric oncology survivors identified through neuropsychological assessment, and the use of school-based services as having educationally relevant neurocognitive impacts of disease or treatment. The interviews explored experiences of education and instructional delivery during the COVID-19 school closures in spring of 2020 and the beginning of the 2020-2021 school year and served as the foundation for a quantitative survey to determine the generalizability of findings. RESULTS: Qualitative interviews highlighted 3 emergent themes regarding the shared experiences of distance schooling for children with cancer during the COVID-19 school closures: (a) attention, (b) mental health, and (c) access to instruction. A follow-up quantitative survey supported the qualitative findings and their generalizability to the schooling experiences of other children with cancer during the pandemic. CONCLUSION: This article describes and explores each theme and offers suggestions for pediatric supports and changes to provider service delivery (including weblinks to access project-developed resources) as a result of ongoing pandemic-related schooling needs.

Study Protocol to Evaluate Influences of Stress and Inflammation on Mucositis in Adolescents and Young Adults With Cancer.

BACKGROUND: Adolescent and young adult (AYA) cancer diagnoses are rising, and gains in survivorship are falling behind for this age group. Dose-limiting toxicities of therapy, including mucositis, are more frequent in this age group and may be contributing to poorer survivorship. Animal models and observational studies suggest that stress and inflammation may be contributing to the high prevalence of dose-limiting mucositis in this age demographic. The AYA oncology population has been an overlooked and underresearched oncology demographic, leading to poor understanding of why this age group has high side-effect burdens and poorer cancer survival. OBJECTIVES: This article describes a novel, prospective clinical study in AYAs receiving chemotherapy designed to evaluate if stress at the time of chemotherapy administration predicts the development of dose-limiting mucositis and determines if stress-induced inflammatory profiles mediate this relationship. This is the first study to translate these stress and inflammation findings from animal models to a nurse-centered research design in humans. METHODS: Persons aged 15-39 years who are receiving chemotherapy with a significant (>20%) risk of developing mucositis will be recruited for a prospective study. Baseline stress is measured through participant questionnaires, and blood is collected to analyze for inflammatory markers. Participants receive chemotherapy as clinically planned and complete a daily survey of mucositis symptoms for 14 days after chemotherapy. Regression and mediation analysis will determine if stress and inflammatory profiles predict the development of dose-limiting mucositis. RESULTS: This model of inquiry through a nursing framework uses a biobehavioral model that considers physiological and psychological risk factors for chemotherapy toxicities. This study is also an important translational science study essential in bringing data from laboratory studies to the clinical arena. The study may also be important to implementation science because assessing the ability of critically ill individuals to participate in low-burden clinical studies may yield essential findings to improve care delivery. DISCUSSION: Findings from this work will identify potentially modifiable factors that may be manipulated to minimize chemotherapy toxicities and lead to improved survival. Data from this study will inform larger research endeavors to better understand symptom development in this high-risk oncological population.

Posttraumatic stress disorder in nurses in the United States: Prevalence and effect on role.

AIMS: The purpose of this study is to determine the prevalence of posttraumatic stress disorder among U.S. nurses and to examine how severity of posttraumatic stress disorder symptoms are associated with their role. BACKGROUND: The lifetime prevalence of posttraumatic stress disorder is estimated at 6.8%. Loss of workdays, inability to perform at full capacity, and loss of fulfillment are a few of the issues associated with an individual diagnosed with posttraumatic stress disorder. Untreated consequences include early retirement, loss of job, disability, and suicide. METHOD: Participants completed an online survey that included the 20-item posttraumatic stress disorder checklist-5. RESULTS: Severity of posttraumatic stress disorder symptoms among nurses estimates that 28.4% have a probable diagnosis of posttraumatic stress disorder with 15.4% experiencing severe symptoms. The impact of stress was negative job performance impacting mental fatigue and workplace attrition. Coping skills included mindfulness and utilizing social networks. CONCLUSIONS: Nurses are exposed to traumatic experiences, which has an impact on their mental health and well-being and ability to successfully perform their jobs. The impact of these experiences is not differentiated by demographic correlates. IMPLICATIONS FOR NURSING MANAGEMENT: This highlights multiple modifiable factors that impact the severity of stressful experiences. Addressing environmental, organizational, and intrapersonal changes are key components in alleviating the negative impact experienced by nurses.

Self-efficacy in symptom management for adolescents and young adults with cancer: a systematic review.

BACKGROUND: Adolescents and young adults (AYAs) have more frequent and intense adverse effects from cancer therapy than other age groups. Self-efficacy, the ability for persons to maintain health-related behavior change, may assist with symptom management but the role it plays in AYAs with cancer has not been thoroughly investigated. This review explores the role that self-efficacy has in symptom management for AYAs with cancer and provides guidance for clinicians to utilize self-efficacy as a means to reduce side effects of therapy. METHODS: A systematic review of peer-reviewed literature was conducted to identify works discussing self-efficacy and symptom management for AYAs with cancer. Five databases were searched with key terms and articles that discussed relationships between self-efficacy and cancer therapy symptoms were retained for analysis. FINDINGS: Twelve manuscripts representing 1180 individuals age 12 to 43 years were identified. Self-efficacy was found to be related to (1) health management behaviors, (2) psychosocial health, (3) sexual and reproductive health, and (4) physical symptoms. Self-efficacy had direct correlations with physical activity, nutritional intake, symptom regulation, mental health, sexual health, and fertility preservation. The included studies did not find significant relationships with medication adherence or pain management. DISCUSSION: Self-efficacy is an attribute that impacts behavior change, health maintenance, and overall wellness and can be changed over time and through interventions to improve symptoms of cancer therapy. Self-efficacy should be evaluated as a construct in relevant studies aimed at improving side effects of cancer therapy to better understand outcomes from interventions. Symptoms, toxicities, and adverse effects of cancer therapy may be improved by increasing self-efficacy of patients.

Alignment of Nurse Practitioner Educational Preparation and Scope of Practice in United States Emergency Departments: A Systematic Review of the Literature.

INTRODUCTION: National debate persists surrounding the expanded use of nurse practitioners in the emergency department. Current understanding of the alignment of nurse practitioner educational preparation and practice parameters in United States emergency departments is inchoate. The objective of this review was to seek evidence to support that nurse practitioner education and training align with current practices in the emergency department. METHODS: A Preferred Reporting Items for Systematic Reviews and Meta-Analyses guided systematic review of the existing literature was conducted of 4 relevant databases. Level of evidence and quality assignments were made for each article using Grading of Recommendations, Assessment, Development, and Evaluation or Confidence in Evidence from Reviews of Qualitative Research as appropriate. RESULTS: Nurse practitioners are increasingly staffing emergency departments, providing care to both patients classified as high-acuity and low-acuity. Reports of nurse practitioner scope of practice vary widely. No studies evaluated alignment of educational preparation and training for actual clinical practice. DISCUSSION: This review of the literature was inconclusive, and the review team we was unable to find evidence that supports the alignment of nurse practitioner educational preparation and training with scope of clinical practice in United States emergency departments. Future research should seek to articulate the landscape of nurse practitioner academic preparation for specialty practice in the emergency department and to specifically examine the alignment of educational preparation with scope of practice and impact on clinical outcomes of patients seen in the emergency department.

Prevalence of Mental Health Disorders Among Undergraduate University Students in the United States: A Review.

The aim of the current review is to describe the prevalence and demographic correlates of mental health disorders among undergraduate university students in the United States. A search strategy was built and conducted using PubMed, PsycINFO, and CINAHL to identify studies published between 2009 and 2019 on the prevalence of mental health disorders, as defined in the fourth and fifth editions of the Diagnostic and Statistical Manual of Mental Disorders, in undergraduate students in the United States. A total of 12 studies were included in the final data extraction. The highest prevalence rates were identified in eating disorders, which ranged from 19% to 48%, followed by compulsive disorders (2% to 12.27%), depression (22%), posttraumatic stress disorder (8%), and sleep disorders (9.4% to 36%). The identified prevalence of mental health disorders is high, and the subsequent impact on this population is worrying. There is an urgent need to develop strategies for early screening and management of mental health services in university settings. [Journal of Psychosocial Nursing and Mental Health Services, 59(2), 17-24.].

Development of the Condensed Heuristic Academic Research Model (CHARM) framework for short-term nursing research groups.

BACKGROUND: The norms by which nursing education and research have been conducted are changing More nursing schools are offering online and blended online/face-to-face programs with a shift in research from individual endeavors to a team-based approach. The changing landscape of nursing education and research requires more planning and adherence to schedules and timelines. A framework outlining efficient means to approach team-based nursing research in the academic setting that is reflective of the emerging blended environment is needed. PURPOSE: This paper discusses the development of the Condensed Heuristic Academic Research Model (CHARM) framework and shares the experiences of one research team's use of the model in completing a five-component research project in one academic semester. DISCUSSION: Employment of the framework facilitates the development of time-management, scholarship, mentorship, and collaborative skills for emerging nurse resarchers, current scientists, and faculty members. CONCLUSION: The CHARM framework is a model that addresses the needs of emerging and experienced nurse researchers and fits well within the new digital and in-person environment of nursing research and education.

Exploring National Nursing Readiness for a Radiological or Nuclear Incident: A Cross-Sectional Study.

INTRODUCTION: As the largest component of the United States health care workforce, nurses will play a critical role in radiological or nuclear disaster medical response. Despite this, the United States' schools of nursing are not currently providing radiation content (75% teach zero or <1 hour), and much of the current nursing workforce may not have received adequate response education and training. Nurses working in emergency departments and those who work at hospitals within the Radiation Injury Treatment Network will be relied on heavily, but little is known about whether these nurses possess the knowledge and skills needed to care for and protect patients after a radiation emergency. Current federal and state radiological/nuclear preparedness plans may be built on false assumptions of readiness, which would have serious implications for national preparedness and the National Health Security Strategy. The purpose of this study was to assess nurses' knowledge and skill in emergency radiological or nuclear response and determine their willingness to use mobile technology for education and training in response to a large-scale radiation event. METHODS: Descriptive cross-sectional survey of registered nurse members of the Emergency Nurses Association and/or those employed at Radiation Injury Treatment Network centers. RESULTS: Knowledge scores were low for all respondents. Prior attendance at a Radiation Emergency Medical Management course, use of online resources, and having a preparedness plan were associated with higher scores. Experience with a radiation emergency was associated with the highest score. Nurses are willing to use mobile technology during a radiological or nuclear disaster response. DISCUSSION: Key nurses may not possess adequate knowledge or clinical competence to participate in radiation response activities. The results of this assessment identified educational gaps and areas to strengthen nursing education and clinical skills.

National nurse readiness for radiation emergencies and nuclear events: A systematic review of the literature.

BACKGROUND: Little is known regarding the capacity of U.S. nurses to respond following a large-scale radiation release, despite its relevance to our National Security Strategy. PURPOSE: To conduct a systematic review of the literature to assess nurse readiness for radiation emergencies and nuclear events. METHODS: A systematic review of publications identified through a comprehensive search of four relevant databases (Embase, PubMed/Medline, Scopus, and Web of Science) was conducted (n = 62). FINDINGS: Limited evidence exists to support that nurses are prepared or willing to respond to a large-scale emergency resulting from a radiation release or nuclear-level event. DISCUSSION: History suggests nurses will be expected to perform triage, minimize radiation exposure, decontaminate, manage trauma, treat burns, and coordinate care for patients. Research is needed to identify the specific roles and responsibilities of nurses in radiation emergencies and nuclear response and to ascertain quantitative measurement of the level of national nurse readiness for these large-scale radiation emergency and nuclear events.

Plant diversity and density predict belowground diversity and function in an early successional alpine ecosystem.

Despite decades of interest, few studies have provided evidence supporting theoretical expectations for coupled relationships between aboveground and belowground diversity and ecosystem functioning in non-manipulated natural ecosystems. We characterized plant species richness and density, soil bacterial, fungal and eukaryotic species richness and phylogenetic diversity (using 16S, ITS, and 18S gene sequencing), and ecosystem function (levels of soil C and N, and rates of microbial enzyme activities) along a natural gradient in plant richness and density in high-elevation, C-deficient soils to examine the coupling between above- and belowground systems. Overall, we observed a strong positive relationship between aboveground (plant richness and density) and belowground (bacteria, fungi, and non-fungal eukaryotes) richness. In addition to the correlations between plants and soil communities, C and N pools, and rates of enzyme activities increased as plant and soil communities became richer and more diverse. Our results suggest that the theoretically expected positive correlation between above- and belowground communities does exist in natural systems, but may be undetectable in late successional ecosystems due to the buildup of legacy organic matter that results in extremely complex belowground communities. In contrast, microbial communities in early successional systems, such as the system described here, are more directly dependent on contemporary inputs from plants and therefore are strongly correlated with plant diversity and density.

Limited ecosystem recovery from simulated chronic nitrogen deposition.

The realization that anthropogenic nitrogen (N) deposition is causing significant environmental change in many ecosystems has led to lower emissions of reactive N and deposition rates in many regions. However, the impacts of N deposition on terrestrial ecosystems can be long lasting, with significant inertia in the return of the biota and biogeochemical processes to baseline levels. To better understand patterns of recovery and the factors that may contribute to slow or no responses following declines in N deposition, we followed plant species composition, microbial abundance, N cycling rates, soil pH, and pools of NO3- and extractable cations in an impacted alpine ecosystem following cessation of 12-yr experiment increasing N deposition rates by 0, 20, 40, and 60 kg N·ha-1 ·yr-1 . Simulated N deposition had resulted in a tripling in the cover of the nitrophilic species Carex rupestris, while the dominant sedge Kobresia myosuroides had decreased by more than half at the highest N input level. In addition, nitrification rates were elevated, soil extractable magnesium (Mg2+ ) and pH decreased, and aluminum (Al3+ ) and manganese (Mn2+ ) were elevated at the highest N treatment inputs. Over the nine years following cessation of N additions to the impacted plots, only the cover of the nitrophilic C. rupestris showed any recovery to prior levels. Abundances of both bacteria and fungi were lower with N addition in both treatment and recovery plots. Rates of nitrification and pools of NO3- remained elevated in the recovery plots, likely contributing to the lack of biotic response to the cessation of N inputs. In addition, nutrient base cations (Ca2+ and Mg2+ ) and soil pH remained depressed, and the toxic metal cations (Al3+ and Mn2+ ) remained elevated in recovery plots, also potentially influencing biotic recovery. These results emphasize the importance of considering long-term environmental impacts of N deposition associated with legacy effects, such as elevated N cycling and losses of base cations, in determining environmental standards such as the metrics used for critical loads.

Dietary quality and carotid intima media thickness in type 1 and type 2 diabetes: Follow-up of a randomised controlled trial.

BACKGROUND AND AIMS: The relationship between dietary intake and carotid intima media thickness (IMT) and pulse wave velocity (PWV) in individuals with type 1 and type 2 diabetes has not been well studied. We investigated the association between dietary intake and common carotid artery intima media thickness (CCA IMT) and PWV in a cohort with type 1 and type 2 diabetes. METHODS AND RESULTS: A one-year randomised controlled trial was conducted to investigate the effect of improving dietary quality on CCA IMT. These subjects were followed up again approximately 12 months after the completion of the trial (i.e. approximately 24 month since baseline). The study cohort included 87 subjects that had dietary intake and CCA IMT measured at baseline and after a mean of 2.3 years' follow-up. PWV was measured in a subsample of this cohort. Age and baseline mean CCA IMT were strongly associated with mean CCA IMT at 24 months. After adjustment for age and baseline mean CCA IMT, baseline consumption of carbohydrate (r = -0.28; p = 0.01), sugars (r = -0.27; p = 0.01), fibre (r = -0.26; p = 0.02), magnesium (r = -0.25; p = 0.02) and the Alternate Health Eating Index (AHEI) score (r = -0.23; p = 0.03) were inversely associated with mean CCA IMT at 24 months. Mixed linear modelling showed an interaction between mean CCA IMT and AHEI at baseline (p = 0.024). Those who were in the highest AHEI tertile at baseline had greater CCA IMT regression at 24 months compared to those in the lowest tertile, after adjustment for baseline age, BMI, smoking pack years, time since diabetes diagnosis, and mean arterial pressure at baseline (mean -0.043 mm; 95% CI -0.084, -0.003; p = 0.029). CONCLUSIONS: In this prospective analysis greater diet quality at baseline, as measured by the AHEI, was associated with greater CCA IMT regression after approximately two years. This suggests that greater diet quality is associated with better longer term vascular health in individuals with type 1 and type 2 diabetes.

Probiotics, prebiotics, synbiotics and insulin sensitivity.

Animal studies indicate that the composition of gut microbiota may be involved in the progression of insulin resistance to type 2 diabetes. Probiotics and/or prebiotics could be a promising approach to improve insulin sensitivity by favourably modifying the composition of the gut microbial community, reducing intestinal endotoxin concentrations and decreasing energy harvest. The aim of the present review was to investigate the effects of probiotics, prebiotics and synbiotics (a combination of probiotics and prebiotics) on insulin resistance in human clinical trials and to discuss the potential mechanisms whereby probiotics and prebiotics improve glucose metabolism. The anti-diabetic effects of probiotics include reducing pro-inflammatory cytokines via a NF-κB pathway, reduced intestinal permeability, and lowered oxidative stress. SCFA play a key role in glucose homeostasis through multiple potential mechanisms of action. Activation of G-protein-coupled receptors on L-cells by SCFA promotes the release of glucagon-like peptide-1 and peptide YY resulting in increased insulin and decreased glucagon secretion, and suppressed appetite. SCFA can decrease intestinal permeability and decrease circulating endotoxins, lowering inflammation and oxidative stress. SCFA may also have anti-lipolytic activities in adipocytes and improve insulin sensitivity via GLUT4 through the up-regulation of 5'-AMP-activated protein kinase signalling in muscle and liver tissues. Resistant starch and synbiotics appear to have favourable anti-diabetic effects. However, there are few human interventions. Further well-designed human clinical studies are required to develop recommendations for the prevention of type 2 diabetes with pro- and prebiotics.