Screening for hypertension in adults: protocol for evidence reviews to inform a Canadian Task Force on Preventive Health Care guideline update.

PURPOSE: To inform updated recommendations by the Canadian Task Force on Preventive Health Care on screening in a primary care setting for hypertension in adults aged 18 years and older. This protocol outlines the scope and methods for a series of systematic reviews and one overview of reviews. METHODS: To evaluate the benefits and harms of screening for hypertension, the Task Force will rely on the relevant key questions from the 2021 United States Preventive Services Task Force systematic review. In addition, a series of reviews will be conducted to identify, appraise, and synthesize the evidence on (1) the association of blood pressure measurement methods and future cardiovascular (CVD)-related outcomes, (2) thresholds for discussions of treatment initiation, and (3) patient acceptability of hypertension screening methods. For the review of blood pressure measurement methods and future CVD-related outcomes, we will perform a de novo review and search MEDLINE, Embase, CENTRAL, and APA PsycInfo for randomized controlled trials, prospective or retrospective cohort studies, nested case-control studies, and within-arm analyses of intervention studies. For the thresholds for discussions of treatment initiation review, we will perform an overview of reviews and update results from a relevant 2019 UK NICE review. We will search MEDLINE, Embase, APA PsycInfo, and Epistemonikos for systematic reviews. For the acceptability review, we will perform a de novo systematic review and search MEDLINE, Embase, and APA PsycInfo for randomized controlled trials, controlled clinical trials, and observational studies with comparison groups. Websites of relevant organizations, gray literature sources, and the reference lists of included studies and reviews will be hand-searched. Title and abstract screening will be completed by two independent reviewers. Full-text screening, data extraction, risk-of-bias assessment, and GRADE (Grading of Recommendations Assessment, Development and Evaluation) will be completed independently by two reviewers. Results from included studies will be synthesized narratively and pooled via meta-analysis when appropriate. The GRADE approach will be used to assess the certainty of evidence for outcomes. DISCUSSION: The results of the evidence reviews will be used to inform Canadian recommendations on screening for hypertension in adults aged 18 years and older. SYSTEMATIC REVIEW REGISTRATION: This protocol is registered on PROSPERO and is available on the Open Science Framework (osf.io/8w4tz).

Influence of water-level variability on fish assemblage and natural reproduction following connectivity enhancement in a Typha-dominated coastal wetland, USA.

We evaluated a wetland habitat modification strategy to contrast fish assemblage structure and the production of young-of-the-year (YOY) fish between different engineered habitats (i.e., spawning pool complexes and connectivity channels) relative to unmodified lateral channels in a large drowned river mouth tributary of the St Lawrence River. Prior to habitat modifications, the coastal wetland was impaired by water level regulations and dominance of the invasive hybrid cattail, Typha × glauca, which collectively replaced or created barriers to seasonally flooded spawning habitats important to fish. Connectivity enhancements provided fish access along a wetland habitat gradient from sedge-meadows to the deeper water robust emergent main channel. Across an 8-year fish emigration dataset (2012, 2013, 2016-2021) more than 90% of all captured fish (Ntotal = 218,086 fish) were YOY and modified habitats outperformed the unmodified channels in total fish catch-per-unit-effort (CPUE) per year (both YOY and non-YOY). Spawning pool complexes had higher YOY species richness than unmodified channel habitats. Fish assemblage structure differed between the modified habitats, where connectivity channels and unmodified channels shared a more similar fish assemblage than spawning pool complexes. Modified habitats, however, supported warmer water and higher dissolved oxygen than the unmodified channels. Redundancy analysis and linear mixed-effect modelling with abiotic variables (hydrology, temperature and dissolved oxygen) showed significant effects on fish assemblage structure, species richness and CPUE of fish emigrating from the modified and unmodified habitats. Historic flooding in 2017 and 2019 was a primary driver of YOY fish production and fish assemblage structure, but also appeared to be associated with near anoxic conditions systemwide. YOY fish for several species was inversely affected by floods at spawning pool complexes, but CPUE of YOY fish for these species appeared unaffected at the connectivity channels despite low dissolved oxygen. Diversified habitat structure (i.e., connectivity channels and spawning pool complexes) offers a management option to enhance habitat for fish that allowed compensatory effects on the capture of YOY fish of several species during floods. This multifaceted outcome from the habitat modifications resulted in unique fish assemblages between the channelized and spawning pool habitat. A connectivity-based habitat enhancement strategy provides adaptability for an uncertain climatic and regulatory future for the Laurentian Great Lakes and St Lawrence River.

Building leadership and managerial capacity for maternal and newborn health services.

BACKGROUND: Strengthening leadership and management is important for building an effective and efficient health system. This paper presents the findings from a L&M capacity building initiative which was implemented as part of a larger study aimed at improving maternal and newborn outcomes within primary health facilities in the Morogoro, Tanzania. METHODS: The initiative, involving 30 stakeholders from 20 primary health facilities, 4 council health management teams and the regional health management team in the Morogoro region, provided leadership and managerial training through two 5-day in-person workshops, onsite mentoring, and e-learning modules. The initiative was evaluated using a pre-post design. Quantitative instruments included the 'Big Results Now' star-rating assessments and a team-developed survey for health providers/managers. The 'Big Results Now' star-rating assessments, conducted in 2018 (19 facilities) and 2021 (20 facilities), measured overall facility leadership and management capability, with comparisons of star-ratings from the two time-points providing indication of improvement. The survey was used to measure 3 key leadership indicators - team climate, role clarity/conflict and job satisfaction. The survey was completed by 97 respondents at baseline and 100 at follow up. Paired t-tests were used to examine mean score differences for each indicator. Triangulated findings from focus groups with 99 health providers and health management team members provided support and context for quantitative findings. RESULTS: Star-ratings increased in 15 (79%) of 19 facilities, with the number of facilities achieving the target of 3 plus stars increasing from 2 (10%) in 2018 to 10 (50%) in 2021, indicating improved organizational performance. From the survey, team climate, job satisfaction and role clarity improved across the facilities over the 3 project years. Focus group discussions related this improvement to the leadership and managerial capacity-building. CONCLUSION: Improved leadership and managerial capacity in the participating health facilities and enhanced communication between the health facility, council and regional health management teams created a more supportive workplace environment, leading to enhanced teamwork, job satisfaction, productivity, and improved services for mothers and newborns. Leadership and managerial training at all levels is important for ensuring efficient and effective health service provision.

Improving access to emergency obstetric care in underserved rural Tanzania: a prospective cohort study.

BACKGROUND: One of the key strategies to reducing maternal mortality is provision of emergency obstetric care services. This paper describes the results of improving availability of, and access to emergency obstetric care services in underserved rural Tanzania using associate clinicians. METHODS: A prospective cohort study of emergency obstetric care was implemented in seven health centres in Morogoro region, Tanzania from July 2016 to June 2019. In early 2016, forty-two associate clinicians from five health centres were trained in teams for three months in emergency obstetric care, newborn care and anaesthesia. Two health centres were unexposed to the intervention and served as controls. Following training, virtual teleconsultation, quarterly on-site supportive supervision and continuous mentorship were implemented to reinforce skills and knowledge. RESULTS: The met need for emergency obstetric care increased significantly from 45% (459/1025) at baseline (July 2014 - June 2016) to 119% (2010/1691) during the intervention period (Jul 2016 - June 2019). The met need for emergency obstetric care in the control group also increased from 53% (95% CI 49-58%) to 77% (95% CI 74-80%). Forty maternal deaths occurred during the baseline and intervention periods in the control and intervention health centres. The direct obstetric case fatality rate decreased slightly from 1.5% (95% CI 0.6-3.1%) to 1.1% (95% CI 0.7-1.6%) in the intervention group and from 3.3% (95% CI 1.2-7.0%) to 0.8% (95% CI 0.2-1.7%) in the control group. CONCLUSIONS: When emergency obstetric care services are made available the proportion of obstetric complications treated in the facilities increases. However, the effort to scale up emergency obstetric care services in underserved rural areas should be accompanied by strategies to reinforce skills and the referral system.

Scale up and strengthening of comprehensive emergency obstetric and newborn care in Tanzania.

INTRODUCTION: In Tanzania, inadequate access to comprehensive emergency obstetric and newborn care (CEmONC) services is the major bottleneck for perinatal care and results in high maternal and perinatal mortality. From 2015 to 2019, the Accessing Safe Deliveries in Tanzania project was implemented to study how to improve access to CEmONC services in underserved rural areas. METHODS: A five-year longitudinal cohort study was implemented in seven health centres (HCs) and 21 satellite dispensaries in Morogoro region. Five of the health centres received CEmONC interventions and two served as controls. Forty-two associate clinicians from the intervention HCs were trained in teams for three months in CEmONC and anaesthesia. Managers of 20 intervention facilities, members of the district and regional health management teams were trained in leadership and management. Regular supportive supervision was conducted. RESULTS: Interventions resulted in improved responsibility and accountability among managers. In intervention HCs, the mean monthly deliveries increased from 183 (95% CI 174-191) at baseline (July 2014 -June 2016) to 358 (95% CI 328-390) during the intervention period (July 2016 -June 2019). The referral rate to district hospitals in intervention HCs decreased from 6.0% (262/4,392) with 95% CI 5.3-6.7 at baseline to 4.0% (516/12,918) with 95% CI 3.7-4.3 during the intervention period while it increased in the control group from 0.8% (48/5,709) to 1.5% (168/11,233). The obstetric case fatality rate decreased slightly from 1.5% (95% CI 0.6-3.1) at baseline to 1.1% (95% CI 0.7-1.6) during the intervention period (not statistically significant). Active engagement strategies and training in leadership and management resulted in uptake and improvement of CEmONC and anaesthesia curricula, and contributed to scale up of CEmONC at health centre level in the country. CONCLUSIONS: Integration of leadership and managerial capacity building, with CEmONC-specific interventions was associated with health systems strengthening and improved quality of services.

Screening for depression in children and adolescents: a protocol for a systematic review update.

BACKGROUND: Major depressive disorder is common, debilitating, and affects feelings, thoughts, mood, and behaviors. Childhood and adolescence are critical periods for the development of depression and adolescence is marked by an increased incidence of mental health disorders. This protocol outlines the planned scope and methods for a systematic review update that will evaluate the benefits and harms of screening for depression in children and adolescents. METHODS: This review will update a previously published systematic review by Roseman and colleagues. Eligible studies are randomized controlled trials (RCTs) assessing formal screening in primary care to identify children or adolescents not already self-reporting symptoms of, diagnosed with, or treated for depression. If no or only a single RCT is available, we will consider controlled studies without random assignment. Studies of participants with characteristics associated with an elevated risk of depression will be analyzed separately. Outcomes of interest are symptoms of depression, classification of major depressive disorder based on a validated diagnostic interview, suicidality, health-related quality of life, social function, impact on lifestyle behavior (e.g., substance use, school performance, lost time at work, or school), false-positive results, overdiagnosis, overtreatment, labeling, and other harms such as those arising from treatment. We will search MEDLINE, Embase, PsycINFO, CINAHL, the Cochrane Library, and grey literature sources. Two reviewers will independently screen the titles and abstracts using the liberal accelerated method. Full-text screening will be performed independently by two reviewers using pre-specified eligibility criteria. Data extraction and risk of bias assessments will be performed independently by two reviewers. Pre-planned analyses, including subgroup and sensitivity analyses, are detailed within this protocol. Two independent reviewers will assess and finalize through consensus the certainty of evidence using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach, and prepare GRADE evidence profiles and summary of findings tables for each outcome of interest. DISCUSSION: The systematic review will provide a current state of the evidence of benefits and harms of depression screening in children and adolescents. These findings will be used by the Canadian Task Force on Preventive Health Care to inform the development of recommendations on depression screening. SYSTEMATIC REVIEW REGISTRATION: PROSPERO CRD42020150373.

Surface-emitting electroholographic SAW modulator.

We report the design and operation of a surface-emitting surface acoustic wave (SAW) acousto-optical modulator which behaves as a cm-scale linear hologram in response to an applied electronic waveform. The modulator is formed by an optical waveguide, transducer, and out-coupling surface grating on a 1 mm-thick lithium niobate substrate. We demonstrate the ability to load and illuminate a 9-region linear hologram into the modulator's 8 mm-long interaction region using applied waveforms of 280-320 MHz. To the best of the authors' knowledge, this is the first demonstration of a monolithically-integrated, surface-emitting SAW modulator fabricated using lithographic techniques. Applications include practical implementations of a holographic display.

Preterm birth and the future risk of orthopedic fracture.

BACKGROUND: Preterm birth occurs during a critical period of bone mineralization. We assessed whether preterm birth increases the risk of childhood fracture. METHODS: We analyzed a cohort of 788,903 infants born between 2006 and 2016 in Quebec, Canada. The exposure was preterm birth (<37 weeks). The outcome was any future hospitalization for fracture before 2018. We estimated hazard ratios (HR) and 95% confidence intervals (CI) for the association of prematurity with fractures in adjusted Cox regression models. We determined if the risk of facture varied by the child's age. RESULTS: The incidence of fracture hospitalizations was higher in preterm children than in term children (17.9 vs. 15.3 per 10,000 person-years). Compared with term, preterm children had 1.27 times the risk of femur fracture hospitalization (95% CI 1.01-1.60) and 2.27 times the risk of assault-related fractures (95% CI 1.37-3.76). Preterm children had 2.20 times the risk of femur fracture between 6 and 17 months of age (95% CI 1.45-3.35). CONCLUSIONS: Preterm birth is associated with an increased risk of hospitalization for femur fractures and assault-related fractures. Associations are stronger before 18 months of age. Families of preterm children may benefit from counseling and support for fracture prevention during early childhood.

Screening for depression in women during pregnancy or the first year postpartum and in the general adult population: a protocol for two systematic reviews to update a guideline of the Canadian Task Force on Preventive Health Care.

BACKGROUND: In 2018, the World Health Organization reported that depression is the most common cause of disability worldwide, with over 300 million people currently living with depression. Depression affects an individual's physical health and well-being, impacts psychosocial functioning, and has specific negative short- and long-term effects on maternal health, child health, developmental trajectories, and family health. The aim of these reviews is to identify evidence on the benefits and harms of screening for depression in the general adult population and in pregnant and postpartum women. METHODS: Search strategies were developed and tested through an iterative process by an experienced medical information specialist in consultation with the review team. We will search MEDLINE, Embase, PsycINFO, CINAHL, and the Cochrane Library, and a randomized controlled trial filter will be used. The general adult review will be an update of a systematic review previously used by the Canadian Task Force on Preventive Health Care for their 2013 guideline recommendation. The search strategy will be updated and will start from the last search date of the previous review (May 2012). The pregnant and postpartum review will be a de novo review with no date restriction. For both reviews, we will search for unpublished documents following the CADTH Grey Matters checklist and relevant websites. Titles and abstracts will be screened using the liberal accelerated method. Two reviewers will independently screen full-text articles for relevance using pre-specified eligibility criteria and assess the risk of bias of included studies using the Cochrane Risk of Bias tool. Outcomes of interest for the general adult population review include symptoms of depression or diagnosis of major depressive disorder, health-related quality of life, day-to-day functionality, lost time at work/school, impact on lifestyle behaviour, suicidality, false-positive result, labelling/stigma, overdiagnosis or overtreatment, and harms of treatment. Outcomes of interest for the pregnant and postpartum review include mental health outcomes (e.g. diagnosis of major depressive disorder), parenting outcomes (e.g. mother-child interactions), and infant outcomes (e.g. infant health and development). DISCUSSION: These two systematic reviews will offer informative evaluations of depression screening. The findings will be used by the Task Force to help develop guideline recommendations on depression screening in the general adult population and in pregnant and postpartum women in Canada. SYSTEMATIC REVIEW REGISTRATION: PROSPERO (CRD42018099690).

Knowledge acquisition after Helping Babies Survive training in rural Tanzania.

BACKGROUND: While the effectiveness of Helping Babies Breathe (HBB) training in Tanzania has been reported, no published studies of Essential Care for Every Baby (ECEB) and Essential Care for Small Babies (ECSB) in this setting have been found. This study compared knowledge before and after HBB, ECEB and ECSB training in Tanzania. METHODS: Training was provided to future facilitators (n=16) and learners (n=24) in Tanzania. Using standardized multiple-choice questions, knowledge was assessed pre- and post-HBB and ECEB courses for both learners and facilitators, while ECSB assessment was conducted with facilitators only. A >80% score was considered to be a pass. Paired t-tests were used for hypothesis testing. RESULTS: Knowledge significantly improved for both facilitators and learners on HBB and ECEB (p<0.001) and for facilitators on ECSB (p<0.001). After training, learners had difficulty identifying correct responses on one HBB item (21% incorrect) and three ECEB items (25-29% incorrect). After training, facilitators had difficulty identifying correct responses on five ECSB items (22-44% incorrect). CONCLUSIONS: Training improved knowledge in Tanzania, but not sufficiently for feeding, especially for low birthweight babies. Targeted training on feeding is warranted both within the Helping Babies Survive program and in preclinical training to improve knowledge and skill to enhance essential newborn care.

Magnetic field imaging with microfabricated optically-pumped magnetometers.

A multichannel imaging system is presented, consisting of 25 microfabricated optically-pumped magnetometers. The sensor probes have a footprint of less than 1 cm2 and a sensitive volume of 1.5 mm × 1.5 mm × 1.5 mm and connect to a control unit through optical fibers of length 5 m. Operating at very low ambient magnetic fields, the sensor array has an average magnetic sensitivity of 24 fT/Hz1/2, with a standard deviation of 5 fT/Hz1/2 when the noise of each sensor is averaged between 10 and 50 Hz. Operating in Earth's magnetic field, the magnetometers have a field sensitivity around 5 pT/Hz1/2. The vacuum-packaged sensor heads are optically heated and consume on average 76 ± 7 mW of power each. The heating power is provided by an array of eight diode lasers. Magnetic field imaging of small probe coils was obtained with the sensor array and fits to the expected field pattern agree well with the measured data.

Major Depressive Disorder Among Preadolescent Canadian Children: Rare Disorder or Rarely Detected?

OBJECTIVE: Despite agreement that preadult onset of depression is associated with greater illness severity, and that children can meet the diagnostic criteria for major depressive disorder (MDD), few studies have examined the presentation of MDD among young children. This is the first nationwide study of MDD among preadolescent children in Canada. METHODS: Pediatrician members (2500) of a Canadian pediatric surveillance network were surveyed monthly over 3 years to report new cases of MDD among 5- to 12-year-olds. Survey response and questionnaire completion rates were 80% and 85%, respectively. Symptom presentation and duration, impairment, medical and psychiatric history, and management were reported. RESULTS: Twenty-nine new cases of MDD were identified by pediatricians. Of these, 23 (79%) experienced symptoms for >6 months before presentation with global functional impairment. Parental depression or anxiety, commonly maternal, was present in 21 cases (72%). Twenty-two children (76%) reported suicidal ideation; 6 (21%) had attempted suicide. Twenty-three children (79%) were treated with medication. Thirteen children (45%) were treated with 2 or more medications. CONCLUSIONS: Children with MDD frequently had a parental history of mood disorders, experienced long-standing symptom presence, high symptom burden and functional impairment prior to presentation; and commonly treatment with polypharmacy.

Long-Term Effects of Education and Legislation Enforcement on All-Age Bicycle Helmet Use: A Longitudinal Study.

Bicycle-related injuries are a leading cause of child and youth hospitalizations in Canada. The use of helmets while bicycling reduces the risk of brain injuries. This study investigated the long-term effect of legislation coupled with enforcement to improve helmet use rates. We conducted a longitudinal observational study of helmet use at 9, 11, and 14 years after bicycle helmet legislation was enacted. Data were compared to baseline observations collected after legislation was passed in 1997. A comprehensive enforcement and educational diversion program, Operation Headway-Noggin Knowledge (OP-NK), was developed and implemented in partnership with regional police during the study period. Helmet use was sustained throughout the post-legislation period, from 75.3 % in the year legislation was enacted to 94.2 % 14 years post-legislation. The increase in helmet use was seen among all age groups and genders. Helmet legislation was not associated with changes in bicycle ridership over the study years. OP-NK was associated with improved enforcement efforts as evidenced by the number of tickets issued to noncompliant bicycle riders. This observational study spans a 16-year study period extending from pre-legislation to 14 years post all-age bicycle helmet legislation. Our study results demonstrate that a comprehensive approach that couples education and awareness with ongoing enforcement of helmet legislation is associated with long-term sustained helmet use rates. The diversion program described herein is listed among best practices by the Public Health Agency of Canada.

Maternal depression and malnutrition in children in southwest Uganda: a case control study.

BACKGROUND: Malnutrition remains one of the most significant child health problems in developing countries with an estimated 53% of child deaths per year attributed to being underweight. The 2011 Uganda Demographic and Health Survey (UDHS) showed that 38 % of the children were stunted and 16% were underweight. While dietary and environmental factors are known major contributors to children's nutritional status, maternal depression may also contribute since it disrupts the mothers' ability to cope with demands of childcare. This study aimed to determine the association between maternal depression and malnutrition in children aged one to 5 years in southwest Uganda. METHODS: The study was undertaken between October and December 2014 on children aged one to 5 admitted to the Mbarara regional referral hospital. Cases were malnourished children and controls were children with other chronic conditions but normal nutritional status admitted to the same hospital. Children's ages were recorded, weight and height taken and converted into height for age, weight for height and weight for age and malnutrition was determined based on WHO child growth standards. Mothers of both groups of children were assessed for depression using the depression module of the Mini International Neuropsychiatric Interview (MINI). Participants provided informed consent prior to enrollment. The study was approved by Mbarara University of Science and Technology Research Ethics Committee and funded by MicroResearch. RESULTS: All 166 mothers who were approached agreed to participate in the study. The prevalence of depression among mothers of malnourished children (86 cases) was 42% compared to 12% among mothers of controls (86 controls). The mean age was 25 years (SD 4.43, range 18-40 years). The majority (75%) were married and most were peasant farmers (62%). Maternal depression was significantly associated with malnutrition in children with a crude odds ratio of 2.23 (1.08-1.89) and an adjusted odds ratio of 2.4 (1.11-5.18). CONCLUSION: Maternal depression impacts negatively on child nutrition and development as shown by a higher prevalence of depression among mothers of malnourished children compared to the control group. Routine screening and treatment for depression should be included in all maternal and child health clinics.

Hot Idea or Hot Air: A Systematic Review of Evidence for Two Widely Marketed Youth Suicide Prevention Programs and Recommendations for Implementation.

INTRODUCTION: Youth suicide is highly related to mental disorders. While communities and schools are marketed to with a plethora of suicide prevention programs, they often lack the capacity to choose evidence-based programs. METHODS: We conducted a systematic review of two youth suicide prevention programs to help determine if the quality of evidence available justifies their wide spread dissemination. We searched Medline, PsycINFO, EMBASE, CINAHL, the Cochrane Library, Campbell Collaboration SPECTR database, SocIndex, Sociological Abstracts, Social Services Abstracts, ERIC, Social Work Abstracts, Research Library, and Web of Science, for relevant studies. We included studies/systematic reviews/meta-analysis that evaluated the effectiveness, cost-effectiveness, and/or safety of Signs of Suicide (SOS) and Yellow Ribbon (YR) suicide prevention programs that target adolescents. We applied the Office of Justice Program What Works Repository (OJP-R) to evaluate the quality of the included studies as effective, effective with reservation, promising, inconclusive evidence, insufficient evidence, and ineffective. Two SOS studies were ranked as "inconclusive evidence" based on the OJP-R. One SOS study was ranked as having "insufficient evidence" on OJP-R. The YR study was ranked as "ineffective" using OJP-R. We only included studies in peer-reviewed journals in English and therefore may have missed reports in grey literature or non-English publications. RESULTS: We cannot recommend that schools and communities implement either the SOS or YR suicide prevention programs. Purchasers of these programs should be aware that there is no evidence that their use prevents suicide. CONCLUSIONS: Academics and organizations should not overstate the positive impacts of suicide prevention interventions when the evidence is lacking.

INTRODUCTION: Le suicide chez les adolescents est fortement lié aux troubles mentaux. Bien que les communautés et les écoles soient la cible de la commercialisation d'une foule de programmes de prévention du suicide, elles n'ont souvent pas la capacité de choisir des programmes fondés sur des données probantes. MÉTHODES: Nous avons mené une revue systématique de deux programmes de prévention du suicide pour adolescents afin de déterminer si la qualité des données probantes disponibles en justifie la large diffusion. Nous avons cherché des études pertinentes dans les bases de données Medline, PsycINFO, EMBASE, CINAHL, Cochrane Library, Campbell Collaboration SPECTR, SocIndex, Sociological Abstracts, Social Services Abstracts, ERIC, Social Work Abstracts, Research Library, et Web of Science. Nous avons inclus les études/revues systématiques/méta-analyses qui évaluaient l'efficacité, la rentabilité et/ou la sûreté des programmes de prévention du suicide Signs of Suicide (SOS) et Yellow Ribbon (YR) destinés aux adolescents. Nous avons appliqué le programme du bureau de la justice Ce qui fonctionne (OJP-R) pour évaluer la qualité des études incluses et cotées efficaces, efficaces avec réserve, prometteuses. données non concluantes, données insuffisantes, et inefficaces. Deux études de SOS ont été classées « données non concluantes ¼ selon l'OJP-R. Une étude de SOS a été classée « données insuffisantes ¼ selon l'OJP-R. L'étude de YR a été classée « inefficace ¼ toujours selon l'OJP-R. Nous n'avons inclus que des études de revues en anglais révisées par des pairs et nous avons donc pu rater des études de la littérature grise ou d'une autre langue que l'anglais. RÉSULTATS: Nous ne pouvons pas recommander que les écoles et les communautés mettent en œuvre les programmes de prévention du suicide SOS ou YR. Les acheteurs de ces programmes doivent savoir que rien ne prouve que leur utilisation prévienne le suicide. Conclusions: Les écoles et les organisations ne devraient pas surestimer les effets positifs des interventions de prévention du suicide en l'absence de données probantes.

Fetal magnetocardiography measurements with an array of microfabricated optically pumped magnetometers.

Following the rapid progress in the development of optically pumped magnetometer (OPM) technology for the measurement of magnetic fields in the femtotesla range, a successful assembly of individual sensors into an array of nearly identical sensors is within reach. Here, 25 microfabricated OPMs with footprints of 1 cm(3) were assembled into a conformal array. The individual sensors were inserted into three flexible belt-shaped holders and connected to their respective light sources and electronics, which reside outside a magnetically shielded room, through long optical and electrical cables. With this setup the fetal magnetocardiogram of a pregnant woman was measured by placing two sensor belts over her abdomen and one belt over her chest. The fetal magnetocardiogram recorded over the abdomen is usually dominated by contributions from the maternal magnetocardiogram, since the maternal heart generates a much stronger signal than the fetal heart. Therefore, signal processing methods have to be applied to obtain the pure fetal magnetocardiogram: orthogonal projection and independent component analysis. The resulting spatial distributions of fetal cardiac activity are in good agreement with each other. In a further exemplary step, the fetal heart rate was extracted from the fetal magnetocardiogram. Its variability suggests fetal activity. We conclude that microfabricated optically pumped magnetometers operating at room temperature are capable of complementing or in the future even replacing superconducting sensors for fetal magnetocardiography measurements.