The effect of smoking cessation counselling in pregnant women: a meta-analysis of randomised controlled trials

BACKGROUND

Pregnant smokers are often prescribed counselling as part of multicomponent cessation interventions. However, the isolated effect of counselling in this population remains unclear, and individual randomised controlled trials (RCTs) are inconclusive.

OBJECTIVE

To conduct a meta-analysis of RCTs examining counselling in pregnant smokers.

SEARCH STRATEGY

We searched the CDC Tobacco Information and Prevention, Cochrane Library, EMBASE, Medline and PsycINFO databases for RCTs evaluating smoking cessation counselling.

SELECTION CRITERIA

We included RCTs conducted in pregnant women in which the effect of counselling could be isolated and those that reported biochemically validated abstinence at 6 or 12 months after the target quit date.

DATA COLLECTION AND ANALYSIS

Overall estimates were derived using random effects meta-analysis models.

MAIN RESULTS

Our search identified eight RCTs (n = 3290 women), all of which examined abstinence at 6 months. The proportion of women that remained abstinent at the end of follow up was modest, ranging from 4 to 24% among those randomised to counselling and from 2 to 21% among control women. The absolute difference in abstinence reached a maximum of only 4%. Summary estimates are inconclusive because of wide confidence intervals, albeit with little evidence to suggest that counselling is efficacious at promoting abstinence (odds ratio 1.08, 95% confidence interval 0.84-1.40). There was no evidence to suggest that efficacy differed by counselling type.

CONCLUSIONS

Available data from RCTs examining the isolated effect of smoking cessation counselling in pregnant women are limited but sufficient to rule out large treatment effects. Future RCTs should examine pharmacological therapies in this population.

Brother of CDO (BOC) expression in equine articular cartilage

Brother of CDO (BOC) is a cell surface receptor that derives its name from the structurally related protein, cell adhesion molecule-related/down-regulated by oncogenes (CDO, sometimes CDON). High levels of BOC mRNA and protein expression have been described in embryonic tissues with active cell proliferation and ongoing cellular differentiation(1,2). A microarray-based screen of RNA isolated from 11 different adult equine tissues unexpectedly identified BOC as having an expression pattern restricted to articular cartilage. The objective of this study was to further investigate BOC expression in adult articular cartilage relative to other tissues. Both RT-qPCR and mRNA sequencing confirmed the microarray data. Steady state BOC mRNA levels in articular cartilage were substantially higher than in the other adult tissues tested, neonatal tendon, placenta, and whole embryo. The expression of BOC displayed a pattern of tissue specificity comparable to well established cartilage matrix protein biomarkers. BOC mRNA levels in articular cartilage increased with age, but were rapidly down-regulated when chondrocytes were enzymatically isolated from the cartilage matrix and expanded in monolayer culture. Relative expression patterns of CDO were broadly similar, but displayed lower fold change differences. A functional role in articular cartilage that involves Hedgehog signaling is suggested by the known binding affinity of BOC for all three Hedgehog ligands. These data also extend BOC and CDO biology to a post-mitotic and highly differentiated cell type within a mature tissue.

A semi-automated software tool to study treadmill locomotion in the rat: from experiment videos to statistical gait analysis

A computer-aided method for the tracking of morphological markers in fluoroscopic images of a rat walking on a treadmill is presented and validated. The markers correspond to bone articulations in a hind leg and are used to define the hip, knee, ankle and metatarsophalangeal joints. The method allows a user to identify, using a computer mouse, about 20% of the marker positions in a video and interpolate their trajectories from frame-to-frame. This results in a seven-fold speed improvement in detecting markers. This also eliminates confusion problems due to legs crossing and blurred images. The video images are corrected for geometric distortions from the X-ray camera, wavelet denoised, to preserve the sharpness of minute bone structures, and contrast enhanced. From those images, the marker positions across video frames are extracted, corrected for rat "solid body" motions on the treadmill, and used to compute the positional and angular gait patterns. Robust Bootstrap estimates of those gait patterns and their prediction and confidence bands are finally generated. The gait patterns are invaluable tools to study the locomotion of healthy animals or the complex process of locomotion recovery in animals with injuries. The method could, in principle, be adapted to analyze the locomotion of other animals as long as a fluoroscopic imager and a treadmill are available.

CHARACTERIZATION OF A NEW LCAT MUTATION CAUSING FAMILIAL LCAT DEFICIENCY (FLD) AND THE ROLE OF APOE AS A MODIFIER GENE OF THE FLD PHENOTYPE

Introduction: LCAT (lecithin:cholesterol acyltransferase ) is an enzyme which plays an essential role in cholesterol esterification and reverse cholesterol transport. Familial LCAT deficiency (FLD) is a disease characterized by a defect in LCAT resulting in extremely low HDL-C, premature corneal opacities, anemia as well as proteinuria and renal failure. Method: We have identified two brothers presenting characteristics of familial LCAT deficiency. We sequenced the LCAT gene, measured the lipid profile as well as the LCAT activity in 15 members of this kindred. We also characterized the plasma lipoproteins by agarose gel electrophoresis and size exclusion chromatography and sequenced several candidate genes related to dysbetalipoproteinemia in this family. Results: We have identified the first French Canadian kindred with familial LCAT deficiency. Two brothers affected by FLD, were homozygous for a novel LCAT mutation. This c.102delG mutation occurs at the codon for His35 causing a frameshift that stops transcription at codon 61 abolishing LCAT enzymatic activity both in vivo and in vitro. It has a dramatic effect on the lipoprotein profile, with an important reduction of HDL-C in both heterozygotes (22%) and homozygotes (88%) and a significant decrease in LDL-C in heterozygotes (35%) as well as homozygotes (58%). Furthermore, the lipoprotein profile differed markedly between the two affected brothers who had different APOE genotypes. We propose that APOE could be an important modifier gene explaining heterogeneity in lipoprotein profiles observed among FLD patients. Our results suggest that a LCAT-/- genotype associated with an APOE ?2 allele could be a novel mechanism leading to dysbetalipoproteinemia.

Stress parental, soutien social, comportements de l’enfant et fréquentation des services de garde

Cette étude examine les taux de problèmes de comportement internalisés et externalisés des enfants et des indices de stress parental et du réseau de soutien social rapportés par les parents d’un échantillon d’enfants et de familles en fonction du type de service de garde fréquenté par les enfants. Elle vise aussi à identifier si les mêmes variables diffèrent en fonction de l’utilisation de divers types de services de garde et de la présence de divers facteurs de risques psychosociaux (0, 1, 2, 3) dans la famille, et ce, tout en contrôlant les effets reliés à l’âge et la santé des enfants ainsi qu’au pays d’origine et à l’âge de la mère. À cette fin, nous utilisons les données de trois cueillettes de données transversales de l’évaluation de l’initiative 1,2,3GO!. L’échantillon comporte 1245 enfants et familles provenant de 10 territoires de la grande région de Montréal. Les enfants sont âgés de 20 à 42 mois. Nous mesurons les comportements des enfants à l’aide du Child Behaviour Checklist (CBCL). Nous utilisons aussi la version abrégée du Parenting Stress Index pour mesurer le stress parental et la taille du réseau de soutien social (Barrera). Les parents répondent à un questionnaire sur le type de garde utilisé pour leur enfant. Les résultats indiquent que la fréquentation d’un service de garde est associée à moins de problèmes de comportements internalisés chez les enfants ainsi qu’à un plus grand réseau de soutien social chez les parents. Il n’y a pas de différences significatives pour ce qui est des scores de comportements externalisés chez les enfants et de l’indice de stress parental chez leurs parents. Ce sont les enfants et leurs parents qui utilisent des services structurés (CPE, garderies et services de garde en milieu familial) qui obtiennent les meilleurs scores relativement aux comportements internalisés des enfants et à la taille du réseau de soutien social des parents. Nos résultats soulignent également que les enfants qui ne fréquentent aucun service de garde présentent des taux supérieurs de comportements internalisés problématiques et externalisés limites à ce qu’on retrouve dans la population en général. Il en est de même pour les parents qui ne recourent à aucun service de garde, c’est-à-dire qu’ils présentent des taux plus élevés de stress parental et plus faibles de soutien social que la population en général. La discussion fait le lien entre les résultats de cette étude et d’autres résultats obtenus récemment. La conclusion propose de poursuivre l’accroissement du réseau afin de mieux répondre aux besoins des familles vulnérables.