Optimizing Health and Health Care Systems for Children with Special Health Care Needs Using the Life Course Perspective

To date, life course research in maternal and child health has largely focused on elucidating fetal and early life influences on adult health and less on promoting the health of children with special health care needs (CSHCN). Consideration of life course theory (LCT) for CSHCN is especially important given their increasing prevalence and comorbidity, their disproportionate vulnerability to weaknesses or instability in the health care system, and the growing evidence linking child and adult health and quality of life. In this commentary we seek to advance the consideration of LCT for CSHCN. We (1) briefly summarize key issues and the importance of a life course approach for CSHCN; (2) present illustrative findings from population-based cross-sectional data that serve to generate hypotheses that can be more rigorously examined when population-based longitudinal data become available; and (3) discuss the application of life course principles as a driving force in the continued implementation and improvement of integrated systems of care for CSHCN.     

Native associations of early hematopoietic stem cells and stromal cells isolated in bone marrow cell aggregates

In suspensions of murine bone marrow, many stromal cells are tightly entwined with hematopoietic cells. These cellular aggregations appear to exist normally within the marrow. Previous studies showed that lymphocytes and stem cells adhered to stromal cells via vascular cell adhesion molecule 1 (VCAM1). Injection of anti-VCAM1 antibody into mice disrupts the aggregates, showing the importance of VCAM1 in the adhesion between stromal cells and hematopoietic cells in vivo. Early hematopoietic stem cells were shown to be enriched in aggregates by using a limiting-dilution culture assay. Myeloid progenitors responsive to WEHI-3CM in combination with stem cell factor (c-kit ligand) and B220- B-cell progenitors responsive to insulin-like growth factor-1 in combination with interleukin-7 are not enriched. We propose a scheme of stromal cell-hematopoietic cell interactions based on the cell types selectively retained within the aggregates. The existence of these aggregates as native elements of bone marrow organization presents a novel means to study in vivo stem cell-stromal cell interaction.     

Effect of menstrual cycle phase on dopamine D2 receptor availability in female cynomolgus monkeys

Sex differences have been reported in a variety of affective and neurodegenerative disorders that involve dysfunctional dopamine (DA) neurotransmission. In addition, there is evidence for differences in sensitivity to the abuse-related effects of psychostimulants across the menstrual cycle which may result from effects of ovarian hormones on DA function. The goal of the present study was to extend previous work examining menstrual cycle-related changes in DA D2 receptor availability in humans to drug-naive female cynomolgus monkeys (n=7) using the selective D2-like receptor ligand [(18)F]fluoroclebopride (FCP) and a high-resolution microPET P4 scanner. Menstrual cycle phase was characterized by daily vaginal swabs and measurements of serum progesterone levels. PET studies were conducted once during the luteal phase and once during the follicular phase. Regions of interest in the caudate nucleus, putamen, and cerebellum were defined on coregistered MRIs. Distribution volumes were calculated for FCP in each structure and the distribution volume ratio (DVR) for both brain regions relative to the cerebellum was used as a measure of D2 receptor availability. FCP DVRs were significantly higher in the luteal phase compared to the follicular phase in both the caudate nucleus (11.7% difference, p=0.02) and putamen (11.6% difference, p=0.03). These findings extend earlier work in humans and suggest that changes in DA receptor availability may be involved in the variation in symptoms of various neuropsychiatric disorders across the menstrual cycle, including differences in sensitivity to the abuse-related effects of stimulants.     

Decreased deformability of erythrocytes from smokers

The deformability of erythrocytes from smoking and non-smoking human subjects was examined by filtration through 3-mu pores and capillary viscometry of cell suspensions. In both cases, small but significant differences were found between the two groups that are consistent with a reduction in the surface area-to-volume ratio and/or a diminished membrane flexibility in erythrocyte from smokers. Additional evidence suggests that these findings represent a chronic rather than an acute effect of smoking on erythrocyte deformability.     

Interventions to improve screening and follow-up in primary care: a systematic review of the evidence

BackgroundThe American Academy of Pediatrics and other organizations recommend several screening tests as part of preventive care. The proportion of children who are appropriately screened and who receive follow-up care is low.ObjectiveTo conduct a systematic review of the evidence for practice-based interventions to increase the proportion of patients receiving recommended screening and follow-up services in pediatric primary care.Data SourceMedline database of journal citations.Study Eligibility Criteria, Participants, and InterventionsWe developed a strategy to search MEDLINE to identify relevant articles. We selected search terms to capture categories of conditions (eg, developmental disabilities, obesity), screening tests, specific interventions (eg, quality improvement initiatives, electronic records enhancements), and primary care. We searched references of selected articles and reviewed articles suggested by experts. We included all studies with a distinct, primary care-based intervention and post-intervention screening data, and studies that focused on children and young adults (≤21 years of age). We excluded studies of newborn screening.Study Appraisal and Synthesis MethodsAbstracts were screened by 2 reviewers and articles with relevant abstracts received full text review and were evaluated for inclusion criteria. A structured tool was used to abstract data from selected articles. Because of heterogeneous interventions and outcomes, we did not attempt a meta-analysis.ResultsFrom 2547 returned titles and abstracts, 23 articles were reviewed. Nine were pre-post comparisons, 5 were randomized trials, 3 were postintervention comparisons with a control group, 3 were postintervention cross-sectional analyses only, and 3 reported time series data. Of 14 articles with preintervention or control group data and significance testing, 12 reported increases in the proportion of patients appropriately screened. Interventions were heterogeneous and often multifaceted, and several types of interventions, such as provider/staff training, electronic medical record templates/prompts, and learning collaboratives, appeared effective in improving screening quality. Few articles described interventions to track screening results or referral completion for those with abnormal tests. Data were often limited by single-site, nonrandomized design.ConclusionsSeveral feasible, practice- and provider-level interventions appear to increase the quality of screening in pediatric primary care. Evidence for interventions to improve follow-up of screening tests is scant. Future research should focus on which specific interventions are most effective, whether effects are sustained over time, and what interventions improve follow-up of abnormal screening tests.     

The changing landscape of disability in childhood

Americans' perceptions of childhood disability have changed dramatically over the past century, as have their ideas about health and illness, medical developments, threats to children's health and development, and expectations for child functioning. Neal Halfon, Amy Houtrow, Kandyce Larson, and Paul Newacheck examine how these changes have influenced the risk of poor health and disability and how recent policies to address the needs of children with disabilities have evolved. The authors examine the prevalence in the United States of childhood disability and of the conditions responsible for impairment, as well as trends in the prevalence of chronic conditions associated with disability. They find that childhood disability is increasing and that emotional, behavioral, and neurological disabilities are now more prevalent than physical impairments. They stress the importance of, and lack of progress in, improving socioeconomic disparities in disability prevalence, as well as the need for better measures and greater harmonization of data and data sources across different child-serving agencies and levels of government. They call on policy makers to strengthen existing data systems to advance understanding of the causes of childhood disabilities and guide the formulation of more strategic, responsive, and effective policies, programs, and interventions. The authors offer a new and forward-looking definition of childhood disability that reflects emerging and developmentally responsive notions of childhood health and disability. They highlight the relationship between health, functioning, and the environment; the gap in function between a child's abilities and the norm; and how that gap limits the child's ability to engage successfully with his or her world. Their definition also recognizes the dynamic nature of disability and how the experience of disability can be modified by the child's environment.     

Medical Home for Adolescents: Low Attainment Rates for Those With Mental Health Problems and Other Vulnerable Groups

BackgroundThe importance of the medical home for children has been demonstrated but has not been examined comprehensively for adolescents. Adolescence is a unique period of physical, cognitive, and psychosocial changes when many mental disorders first emerge; thus, receiving care within a medical home could improve well-being. This study examines rates of medical home attainment and its components for adolescents and subgroups, including those with mental health conditions.MethodsUtilizing the 2007 National Survey of Children’s Health, we determined the following for adolescents aged 10 to 17 years (n = 45 897): 1) rates of medical home attainment and its 5 components (usual source of care, having a personal doctor, and receiving needed referrals, effective care coordination, and family-centered care); and 2) subgroup differences; gender, race/ethnicity, income, insurance, region, language spoken at home, respondent education, and the presence of mental health conditions.ResultsFifty-four percent of adolescents had a past-year medical home. Rates were lower for minority youth compared to whites; lower-income and uninsured youth; those in households that are non–English speaking in which the respondent did not have some college; and those with mental health as opposed to physical health conditions (all P < .01). Patterns of disparities in the medical home components were similar, and rates were lowest for effective care coordination and family-centered care components.ConclusionsNearly half of adolescents lacked a medical home in the past year. Even lower rates for subgroups highlight the need to increase access to comprehensive quality health care. Efforts to improve effective care coordination and family-centered care could result in higher quality of care for all children and adolescents, and specifically for disadvantaged adolescents and those with mental health conditions.     

Production and characterization of a monoclonal antibody reactive with a specific neoantigenic determinant (comprising B beta 54-118) in degradation products of fibrin and of fibrinogen

Balb/c mice were immunized with a mixture of fibrin degradation products (XDPs) prepared by complete lysis of a human blood clot by tissue-type plasminogen activator and purified by immunoaffinity chromatography. Spleen cells of the mice were fused with P3 X 63 Ag 8653 myeloma cells. A clone (FDP 14) was selected that produces monoclonal antibodies (MoAbs) of the IgG1 kappa type that react with a neoantigenic determinant exposed in these XDPs, but not in intact fibrinogen or in fibrin monomers. Furthermore, the MoAb is reactive with some pure, individual degradation products of fibrinogen (fragments X, Y, E, and the N-terminal disulphide knot) and with the fibrinogen B beta-chain but not with A alpha- and gamma-chains or with fragments D, FCB-2 and FCB-3. Comparison of the known primary structures of these fibrinogen fragments indicates that the stretch B beta 54-118 comprises at least an important part of the epitope recognized by FDP-14. Apparently, this stretch contributes importantly to a neoantigenic determinant that is not functional in intact fibrinogen and fibrin monomer and that can be made functional by reduction of fibrinogen, or by digestion with plasmin or CNBr.     

Spondylometaphyseal dysplasia, corner fracture type: a heritable condition associated with coxa vara

The authors present the radiographic features of a previously incompletely delineated bone dysplasia, which they call spondylometaphyseal dysplasia, corner fracture type. This is a dominant heritable condition associated with short stature and developmental coxa vara. The progressive hip deformity usually causes significant disability requiring surgical correction. Developmental coxa vara, simulated corner fractures of long tubular bones, and vertebral body abnormalities result in a diagnostic constellation. Knowledge of these distinctive radiologic features allows accurate diagnosis, which in turn should lead to appropriate genetic counseling and possibly to earlier, more efficacious surgical treatment of the coxa vara.