Clinical and sociodemographic variables associated with the onset of posttraumatic stress disorder in road traffic accidents

Our objective was to identify variables related to the onset of acute posttraumatic stress disorder (PTSD) after a road traffic accident. We evaluated 60 victims of a motor vehicle accident (MVA) in 2004 at 2 months postaccident. Thirty of them had developed PTSD; the other 30 had not developed PTSD. Clinical data, physical injuries, and sociodemographic characteristics were determined in 60 victims. The Davidson Trauma Scale (DTS) and a Structured Clinical Interview for DSM-IV (SCID) were used to evaluate PTSD occurrence. PTSD scores assessed by DTS and SCID at 2 months were significantly and positively associated with female sex, severe physical injuries, perceived social deprivation, and loss of job activity due to the accident. Female sex, severe physical injury, perceived social deprivation, and sick leave were related to the diagnosis of PTSD 2 months after the accident.     

Novel pharmacological targets based on receptor heteromers

Studies performed in the last 10 years have provided solid evidence indicating that G-protein-coupled receptors are expressed on the plasma membrane as homo and heterodimers. The first consequence of this fact is that homo and heterodimers are the true targets of natural (hormones, neurotransmitters) and synthetic drugs. Furthermore a given receptor in a heteromer may display a different functional and/or pharmacological profile than the same receptor characterized as monomer or as homodimer. Recent evidence indicates that receptor heteromers are sensors that lead to a fine-tuning in neurotransmission or hormone regulation; mainly this is achieved by a modification of the signaling pathways activated via a given receptor when it is forming a given heteromer. Quite often antagonists display variable affinities when a given receptor is expressed with different heteromeric partners. This fact should be taken into account in the development of new drugs. Finally it should be pointed out that radioligand binding data has to be analyzed by a model that considers receptors as dimers and not as monomers. This model provides a novel approach to characterize drugs interacting with the orthosteric center (agonists/antagonists) or with allosteric centers (allosteric regulators).     

Development of a hinge compatible with the kinematics of the knee joint

This study aims to present a new concept of a knee hinge based on a crossed four-bar linkage mechanism which has been designed to optimally follow a motion curve representing the knee kinematics in the position at which the knee hinge should be placed. The methodology used to determine the optimal knee hinge is based on the optimization of certain variables of the crossed four-bar mechanism using genetic algorithms in order to follow a certain motion curve, which was determined using a biomechanical model of the knee motion. Two current, commercially available knee hinges have been used to theoretically determine their motion by means of the path performed by their instantaneous helical axis. Comparison between these two different knee hinges, Optimal Knee Hinge and the theoretical motion performed by a human knee reveals that a common monocentric hinge has a maximum misalignment of up to 27.2 mm; a polycentric hinge has a maximum misalignment of 23.9 mm. In contrast, the maximum misalignment produced by the Optimal Knee Hinge is 1.99 mm. The orthotic joint presented significantly improves the kinematical compatibility and the adjustment between orthotic and human joint motion, and should provide several advantages in terms of comfort and safety. Furthermore, the determination of the instantaneous helical axis for a particular user, by means of human movement measurement techniques, will enable the optimal crossed four-bar mechanisms to be determined in a customized and personalized manner. As a consequence, this new concept of orthotic knee joint design may improve the adaptability of lower limb orthoses for the user, and may lead to significant advantages in the field of orthotics for the lower limb.     

Socioeconomic inequalities in alcohol related cancer mortality among men: To what extent do they differ between Western European populations?

We aim to study socioeconomic inequalities in alcohol related cancers mortality [upper aerodigestive tract (UADT) (oral cavity, pharynx, larynx, oesophagus and liver)] in men and to investigate whether the contribution of these cancers to socioeconomic inequalities in cancer mortality differs within Western Europe. We used longitudinal mortality datasets, including causes of death. Data were collected during the 1990s among men aged 30-74 years in 13 European populations [Madrid, the Basque region, Barcelona, Turin, Switzerland (German and Latin part), France, Belgium (Walloon and Flemish part, Brussels), Norway, Sweden, Finland]. Socioeconomic status was measured using the educational level declared at the census at the beginning of the follow-up period. We conducted Poisson regression analyses and used both relative [Relative index of inequality (RII)] and absolute (mortality rates difference) measures of inequality. For UADT cancers, the RII's were above 3.5 in France, Switzerland (both parts) and Turin whereas for liver cancer they were the highest (around 2.5) in Madrid, France and Turin. The contribution of alcohol related cancer to socioeconomic inequalities in cancer mortality was 29-36% in France and the Spanish populations, 17-23% in Switzerland and Turin, and 5-15% in Belgium and the Nordic countries. We did not observe any correlation between mortality rates differences for lung and UADT cancers, confirming that the pattern found for UADT cancers is not only due to smoking. This study suggests that alcohol use substantially influences socioeconomic inequalities in male cancer mortality in France, Spain and Switzerland but not in the Nordic countries and nor in Belgium.     

中国儿童青少年性发育现状研究

目的:了解中国儿童青少年性发育现状,比较不同地区性早熟情况。方法:于2009年10月至2010年10月,选择有地域代表的北京、天津、杭州、上海、重庆和南宁六地区6~18岁中小学生共18 707名(男9 812名和女8 895名),按标准化方法测定各年龄组儿童身高、体重、臀围和腰围等数据。采用女性乳房和男性睾丸容积Tanner分期指标衡量青春期发育。采用概率分析法测算男女第二性征出现的年龄中位数及95%可信区间。用精确概率法分析不同地区性早熟发生率,用t检验比较组间不同BMI、腰围计量资料。结果:女孩8岁组以前出现乳房发育的比例为2.91%,男孩9岁以前出现睾丸发育的比例为1.74%。女孩呈现乳房发育B2的中位年龄是9.69(95%CI:9.63~9.75)岁,男孩睾丸达G2期的中位年龄为11.25(95%CI:11.19~11.30)岁。共有80例儿童诊断为性早熟,女孩43例,男孩37例,其患病率为0.43%。北部地区较西南地区发病率高(0.736%vs 0.282%,P<0.05)。三个地区女孩性早熟的发病年龄没有差异,男孩性早熟华东地区发病年龄较早(7.4±0.28)岁。性早熟儿童其BMI的SD值及腰臀比(W/H)较正常同龄儿童高,不同地区性早熟儿童BMI、腰围、腰臀比比较差异均无统计学意义。结论:目前的性早熟诊断标准适合于评估调查地区的儿童性早熟状况。性早熟发病率及发病年龄在不同地区存在一定差异。肥胖与性早熟之间存在正相关。     

Social inequalities in the association between partner/marital status and health among workers in Spain

The objectives of this study are to examine the association between partner/marital status and several health outcomes among workers and to assess whether it depends on gender and occupational social class. The sample was composed of all workers aged 21-64 years interviewed in the 2006 Spanish National Health Survey (8563 men and 5881 women). Partner/marital status had seven categories: married and living with the spouse (reference category), married and not living with the spouse, cohabiting, single and living with parents, single and not living with parents, separated/divorced and widowed. Four health outcomes were analysed: self-perceived health status, mental health, psychiatric drugs consumption and hypertension. Multiple logistic regression models stratified by sex and social class were fitted. Female manual workers who were cohabiting were more likely to report poor self-perceived health status, poor mental health status, psychiatric medication consumption and hypertension than their married and living with the spouse counterparts. In that group the prevalence of poor health outcomes was even higher when compared with single people. Among male non-manual workers, being married and not living with the spouse was associated with poor self-perceived health status, poor mental health status and hypertension. There were almost no differences in health between being married and the rest of partner/marital status categories for different combinations of gender and social class and, even, some groups of single people reported better health outcomes than people who were married. Our results show no evidence that being married and living with the spouse is unequivocally linked to better health status among Spanish workers. They emphasize the importance of not only considering marital status, but also partner status, as well as the role of gender, social class and the sociocultural context in the analysis of the association between family characteristics and health.     

Plasmodium falciparum malaria in splenectomized patients: two case reports in French Guiana and a literature review

Some of the immunologic mechanisms involved in malaria physiopathology remain unclear. In animals, the spleen seems to play a key role in protecting the host against malaria. However, little is known about the effect of spleen dysfunction on human malaria. We report two severe cases of Plasmodium falciparum infection with unusual clinical and parasitologic features in two splenectomized men living in French Guiana. The peripheral blood of these cases showed hyperparasitemia, with a high proportion of mature parasites and leukocytes with malaria pigment. Despite appropriate treatment and adequate absorption, hyperparasitemia persisted. Parasite clearance was delayed and one patient died. Only the patient who died had the merozoite surface protein 1 allele B-K1 and the varD gene genotype, which is considered to be a probable parasite virulence factor. These uncommon cases differ from most of those described in the literature, illustrating the complexity of the mechanisms underlying the protective function of the spleen in human malaria.     

X-inactivation of HSD17B10 revealed by cDNA analysis in two female patients with 17β-hydroxysteroid dehydrogenase 10 deficiency

17β-Hydroxysteroid dehydrogenase 10 (HSD10) is a mitochondrial enzyme involved in the degradation pathway of isoleucine and branched-chain fatty acids. The gene encoding HSD10, HSD17B10, has been reported as one of the few genes that escapes X-inactivation. We previously studied two female patients with HSD10 deficiency, one of them was severely affected and the other presented a mild phenotype. To elucidate as to why these two carriers were so differently affected, cDNA analyses were performed. The HSD17B10 cDNA of eight control cell lines, two hemizygous patients and two carriers was obtained from cultured fibroblasts, amplified by PCR and sequenced by standard methods. All HSD17B10 cDNAs were quantified by real-time PCR. In the fibroblasts of the female patient who presented with the severe phenotype, only the mutant allele was identified in the cDNA sequence, which was further confirmed by relative quantification (RQ) of HSD17B10 cDNA. This is in agreement with an unfavourable X-inactivation. The other female patient, with slight clinical affectation, showed the presence of both mutant and wild-type alleles in the cDNA sequence, which was confirmed by RQ of HSD17B10 cDNA in fibroblasts. This is in line with normal X-inactivation and the expression of both alleles in different cells (functional mosaicism). RQ results of HSD17B10 cDNA did not differ significantly between male and female controls, which indicate that the genetic doses of mRNA of HSD17B10 was the same in both sexes. In conclusion, these results suggest that the HSD17B10 gene does not escape X-inactivation as has been reported previously.