Les dysfonctions placentaires sont fortement associées aux complications de la grossesse et de plus en plus reliées à une augmentation de médiateurs inflammatoires endogènes, appelés alarmines ou motifs moléculaires associés aux dommages (« damage associated molecular patterns » (DAMPs). High-mobility group box 1 (HMGB1), est un DAMP qui a été associé aux grossesses avec PE et accouchement prématuré. HMGB1 est une protéine nucléaire qui peut être sécrétée dans l’espace extracellulaire de façon passive ou active. Une fois dans l’espace extracellulaire, HMGB1 existe sous différents isoformes ayant des actions inflammatoires distinctes. Le rôle de HMGB1 et de ses isoformes à l’interface materno-fœtale est encore peu connu. L’objectif de mes travaux de maitrise était d’investiguer le rôle de HMGB1 à l’interface materno-fœtale, en déterminant sa localisation subcellulaire pendant la syncytialisation, ainsi que les actions pro-inflammatoires sur le placenta. Méthodes : Un modèle d’explants placentaires en conditions physiologiques fut utilisé afin de déterminer et de moduler la localisation subcellulaire de HMGB1. Le même modèle a été traité avec les différentes isoformes de HMGB1 (HMGB1-disulfide: D ou HMGB1-réduit: R) afin de déterminer leurs effets inflammatoires et leurs impacts sur la fonction placentaire. Des placentas de femmes ayant des grossesses sans complications, une prééclampsie (PE) ou une prééclampsie du postpartum (PPPE) ont été étudiés afin de déterminer la distribution de HMGB1 et ses récepteurs (Receptor for advanced glycation end product (RAGE) et Toll like receptor (TLR4)). Résultats : La localisation intracellulaire de HMGB1 est modulée pendant le processus de syncytialisation avec une localisation majoritairement cytoplasmique et extracellulaire par rapport à une localisation généralement nucléaire dans les trophoblastes différenciés. Favoriser l’export nucléaire de HMGB1 avec un inhibiteur d’histone déacétylase (HDAC), le sodium butyrate (NaB) augmente la concentration cytoplasmique de HMGB1 ainsi que la sécrétion de l’hormone chorionique gonadotrope (-hCG), signe de la différentiation des trophoblastes. L’isoforme disulfide de HMGB1 induit la sécrétion de cytokines pro-inflammatoire (IL-1, IL-6 et MCP-1) et a aussi un impact sur la différenciation des trophoblastes, tel qu’observé par une diminution de la sécrétion de -hCG. En conditions pathologiques, l’expression de HMGB1 et ses récepteurs RAGE et TLR4 est augmentée dans des conditions de prééclampsie du post-partum. Pour conclure, la localisation subcellulaire de HMGB1 est modulée pendant la syncytialisation, dans un contexte non-pathologique. L’accumulation cytoplasmique de HMGB1 est la première étape avant la sécrétion dans l’espace extracellulaire. Lorsque dans l’espace extracellulaire, une isoforme spécifique de HMGB1 (HMGB1-D) entraine l’augmentation de la sécrétion de cytokines pro-inflammatoires. L’expression de HMGB1 et ses récepteurs est augmentée et conditions pathologiques démontrant que ce DAMP peut jouer différents rôles tant dans un contexte inflammatoire et de dysfonctions placentaires ainsi que dans un contexte de différenciation des trophoblastes. / Sterile inflammation, caused by endogenous damaged-associated-molecular-patterns (DAMP), at the maternal fetal interface is frequently observed in pregnancy complications and leads to placental inflammation and dysfunction by unknown mechanisms. HMGB1 has been associated to preeclampsia, preterm birth and it can be released in the extracellular space and associated to increased inflammatory actions. Extracellular HMGB1 has two isoforms, (HMGB1-disulfide-D) inducing proinflammatory cytokines whilst the other (HMGB1-reduced-R) acts as a chemoattractant. The role of HMGB1 and its isoform at the maternal-fetal interface is mostly unknown. The objective of my master was to investigate the roles of HMGB1 at the maternal-fetal interface including its subcellular localisation during trophoblast differentiation and pro-inflammatory effects on the placenta. Methods: Term placental explants were used to determine the subcellular localisation of HMGB1 during trophoblast differentiation or treated with specific HMGB1 isoforms (HMGB1-D or HMGB1-R) to determine the impact on inflammation and placental function. Alongside, placentas from women with either normal term pregnancies, PE or PPPE were used to determine the distribution of HMGB1 and its receptor. Results: HMGB1 subcellular localisation is modulated during the syncytialisation process with major cytoplasmic and extracellular localisation to a more nuclear localisation in differentiated trophoblasts. Promoting HMGB1 nuclear export, using the histone deacetylase inhibitor (HDAC) NaB, increased HMGB1 cytoplasmic concentration leading to increase secretion of human chorionic gonadotropin (-hCG) in placental explants. HMGB1-D treatment of explants led to the secretion of pro-inflammatory cytokines (IL-1, IL-6 et MCP-1) and impacted trophoblasts differentiation observed by decreased -hCG secretion. In pathological conditions, HMGB1 and his receptors, RAGE and TLR4, expression is increased in PPPE compared to non-pathological pregnancy. To conclude, we demonstrated changes in the localisation of HMGB1 in association with trophoblast differentiation in uncomplicated pregnancies. Cytoplasmic accumulation of HMGB1 is the first step before its release in the extracellular space. We showed that a specific isoform of HMGB1 (disulfide isoform) induced inflammatory cytokines secretion which suggests a role of this DAMP in placental inflammation and function. Finally, HMGB1 and its receptors are increased in a pathological condition (PPPE) demonstrating that this DAMP may play different role in both inflammatory context and trophoblast differentiation.

Chlamydia trachomatis is the most common sexually transmitted bacterial disease agent worldwide, and, though frequently asymptomatic, can cause extreme pathology including infertility. Chlamydial species exhibit a unique biphasic developmental cycle. Once attached to a cell surface, infectious elementary bodies (EB) are internalized within an inclusion, the membrane-bound structure in which EB transform to noninfectious, replicable reticulate bodies (RB). After multiple rounds of division, RB condense to form EB, which are released and can infect new host cells. In culture, exposure to stressors, such as beta-lactam antibiotics, induce chlamydiae to reversibly detour from normal development into a noninfectious, viable state termed persistence. Cell culture data suggest that persistent forms are resistant to azithromycin (AZM), a front-line antibiotic, and are able to alter the host transcriptome. Though persistence has been described in culture for over 50 years, whether or not it: i) occurs in vivo; and ii) influences chlamydial pathogenesis, transmission and therapy has remained unresolved. To address these questions, we developed an animal model of persistent chlamydial infection using amoxicillin (AMX) treatment. AMX exposure decreased shedding of infectious chlamydiae in C. muridarum-infected mice without affecting chlamydial viability, demonstrating the presence of persistent chlamydiae. Shedding of infectious EB resumed following AMX cessation. Shedding data and microarray analyses suggested that host immunity might limit chlamydia’s exit from persistence in our model. Thus, we hypothesized that cyclophosphamide (CTX) treatment would increase the magnitude of chlamydial shedding observed after AMX-treatment cessation. CTX treatment increased post-AMX shedding by more than 10-fold compared to AMX-only controls. To determine whether persistent chlamydiae are resistant to antibiotic eradication in vivo, we induced persistence by administering AMX and treated mice with various AZM dosing regimes. Persistently infected mice demonstrated increased treatment failure following AZM therapy compared to productively infected controls. These data suggest that persistent chlamydiae are refractory to treatment in vivo and provide an explanation for the observation that treatment fails in some patients. In addition to creating the first fully characterized, experimentally tractable, in vivo model of chlamydial persistence, these experiments provide evidence that persistent/stressed chlamydial forms may serve as a long-term reservoir of infectious organisms in vivo.

Thesis (M. (Nursing)) -- University of Limpopo, 2022 / Background: The referral system is an essential component of the health system. The system meant to complement the Primary Health Care (PHC) principle of treating patients close to their homes at the lowest level of care with the needed expertise. Aim of the study: The aim of the study is to develop the strategies that will facilitate the referral system of high-risk pregnant women in between public sectors in the Bojanala district, North West Province, South Africa. Objectives of the study: To explore the referral system of high-risk pregnant women between public sectors within the Bojanala District, North West Province, South Africa. To develop strategies that will facilitate the referral system of high risk pregnant women in the Bojanala District, North West Province, South Africa. Methods: The researcher first obtained permission from the University of Limpopo Turfloop Research Ethics Committee (TREC), and further requested permission from the North West Department of Health, Bojanala District to conduct the study and was granted the permission. Qualitative, exploratory and descriptive designs were used to explore the referral system of high-risk pregnant women and to describe the strategies to facilitate the referral system of high-risk pregnant women in between public sectors in the Bojanala District, North West, South Africa. Non-Probability Purposive sampling method was used to select the midwives and obstetricians to participate in the study until data saturation was reached. Data were collected through one-on-one interviews using semi structured Interview Guide. The data were analysed using Tesch‘s eight steps of data analysis. Results: The results of this study revealed that the participants are knowledgeable about the referral system though they are many challenges that they encounter when managing high-risk women and having to refer them. They are aware of the current state of referral system and made their own suggestions on how to improve the referral system. Recommendations: Recommendations were made to facilitate the referral system of high-risk pregnant women in the North West Province, Bojanala District. The Department of Health must prioritise the provision of human and material resources to the district in order to achieve a better referral system and reducing the maternal and neonatal mortality as one of the millennium developmental goals. Conclusion: The referral system of high-risk pregnant women in the Bojanala District still has some challenges that need the intervention of the North West Department of Health to provide enough material and human resources to the Maternity Section in order to improve current status and to have an effective referral system

No description available.

Introdução:A mortalidade materna é um dos melhores indicadores do desenvolvimento socioeconômico de um país. O Brasil implementou políticas públicas para redução da mortalidade materna até 2015. A região do Grande ABC Paulista no Brasil apresenta grande heterogeneidade socioeconômica entre seus municípios, podendo refletir a desigualdade social do país, porém apresentando dimensões que permitem maior controle de dados da mortalidade. Objetivo: Avaliar a tendência da mortalidade materna na região do Grande ABC Paulista no período de 1997 a 2011. Metodologia: Estudo ecológico de série temporal, cujos dados foram obtidas no banco de dados do Departamento de Informática do Sistema Único de Saúde do Brasil (DATASUS) do Ministério da Saúde do Brasil (MS). Os dados foram transformados em Índices da Mortalidade Materna Direta (IMMD), estratificados por municípios, índices de desenvolvimento humano (IDH), causas de óbito materno segundo Classificação internacional de doenças (CID-10), local e período de ocorrência do óbito, dados sóciodemográficos e submetidos a comparações (teste U de Mann-whitney, teste de Kruskal-Wallis e teste de Dunn) e associações pela regressão linear, com significância de 5%. Resultados: Os IMMD predominaram em mulheres solteiras, entre 20-34 anos de idade, brancas, escolaridade entre 4-7 anos, intra-hospitalar, no puerpério imediato, por hemorragias/tromboses/embolias e eclâmpsias. Não houve diferença nos IMMD em relação ao grupo IDH. Rio Grande da Serra atingiu IMMD alto (OMS) na maioria das covariáveis analisadas. Apenas São Caetano do Sul apresentou IMMD baixo (OMS), alto IMMI (p=0,03), queda nos IMMD no período de 1997 a 2011 (beta= -0,67/ano, p=0,03) e tendência neste milênio (2000 a 2011, beta=-0,55/ano, p=0,07) com estimativa de queda de 65,1% até 2015. A soma dos óbitos não investigados, não se aplica e de fichas sem investigação para qualquer variável analisada ultrapassa 50%. Conclusão: Os índices da Mortalidade Materna Direta na região do Grande ABC Paulista apresentaram níveis altos e queda discreta no tempo. Apenas o município de São Caetano do Sul apresentou queda expressiva de IMMD nos 15 anos de estudo e tendência a queda neste milênio com estimativa de atingir 65,1% até 2015. Descritores: Mortalidade materna; Políticas públicas; Mulheres; Saúde da mulher/estatística & dados numéricos; Complicações na gravidez/mortalidade; Mortalidade; Sistema Único de Saúde; Estudos epidemiológicos; Saúde da mulher/estatística & dados numéricos; Período pós-parto; Objetivos de desenvolvimento do milênio; Brasil/epidemiologia / Introduction: Maternal mortality is one of the best indicators of socioeconomic development of a country. Brazil has implemented public policies to reduce maternal mortality by 2015. The Grande ABC Paulista region in Brazil shows great socioeconomic heterogeneity among its municipalities, which can reflect the country social inequality, however presenting dimensions that allow greater control of mortality data. Objective: To evaluate the trend of maternal mortality in the Grande ABC Paulista region in the period of 1997-2011. Methodology: Ecological time series, where data was obtained from the database of the Information Technology Department of the Public Health Care System (DATASUS) of the Health Ministry of Brazil (MS). The data was transformed into direct maternal mortality indices (DMMI), stratified by municipalities, Human Development Indices (HDI), causes of maternal death according to the International Classification of Diseases (ICD-10), period and local of maternal death, socio-demographic parameters. Data were submitted to comparison tests (Mann-Whitney U test, Kruskal-Wallis test, followed by Dunn\'s multiple comparisons test) and association tests (linear regression) when applied and a significance of 5%. Results: The DMMI predominated in single women, aged 20-34 years old, white, 4 to 7 school age, in-hospital, postpartum, by bleeding / thrombosis / embolism and eclampsia. There was no difference in DMMI when comparing by HDI group. The Municipality of Rio Grande da Serra reached high DMMI values in the most of the analyzed covariates. São Caetano do Sul presented the lowest DMMI values and was the only municipality which presented decrement in the DMMI during the 15 years of the studied period (beta = - 0.67/year, p=0.03) and a trend in this millennium (2000-2011, beta- 0.55/year, p=0.07) with an estimated fall of 65.61% by 2015. The sum of not investigated, not applied and files without investigation for any analyzed variable exceeded 50%. Conclusion: The DMMI in the Grande ABC Paulista showed high levels and downward trend in time. São Caetano do Sul was the sole municipality where the DMMR dropped in 15 years of study and presented a tendency to decrease in this millennium with an estimated fall of 65.1% by 2015

Introdução:A mortalidade materna é um dos melhores indicadores do desenvolvimento socioeconômico de um país. O Brasil implementou políticas públicas para redução da mortalidade materna até 2015. A região do Grande ABC Paulista no Brasil apresenta grande heterogeneidade socioeconômica entre seus municípios, podendo refletir a desigualdade social do país, porém apresentando dimensões que permitem maior controle de dados da mortalidade. Objetivo: Avaliar a tendência da mortalidade materna na região do Grande ABC Paulista no período de 1997 a 2011. Metodologia: Estudo ecológico de série temporal, cujos dados foram obtidas no banco de dados do Departamento de Informática do Sistema Único de Saúde do Brasil (DATASUS) do Ministério da Saúde do Brasil (MS). Os dados foram transformados em Índices da Mortalidade Materna Direta (IMMD), estratificados por municípios, índices de desenvolvimento humano (IDH), causas de óbito materno segundo Classificação internacional de doenças (CID-10), local e período de ocorrência do óbito, dados sóciodemográficos e submetidos a comparações (teste U de Mann-whitney, teste de Kruskal-Wallis e teste de Dunn) e associações pela regressão linear, com significância de 5%. Resultados: Os IMMD predominaram em mulheres solteiras, entre 20-34 anos de idade, brancas, escolaridade entre 4-7 anos, intra-hospitalar, no puerpério imediato, por hemorragias/tromboses/embolias e eclâmpsias. Não houve diferença nos IMMD em relação ao grupo IDH. Rio Grande da Serra atingiu IMMD alto (OMS) na maioria das covariáveis analisadas. Apenas São Caetano do Sul apresentou IMMD baixo (OMS), alto IMMI (p=0,03), queda nos IMMD no período de 1997 a 2011 (beta= -0,67/ano, p=0,03) e tendência neste milênio (2000 a 2011, beta=-0,55/ano, p=0,07) com estimativa de queda de 65,1% até 2015. A soma dos óbitos não investigados, não se aplica e de fichas sem investigação para qualquer variável analisada ultrapassa 50%. Conclusão: Os índices da Mortalidade Materna Direta na região do Grande ABC Paulista apresentaram níveis altos e queda discreta no tempo. Apenas o município de São Caetano do Sul apresentou queda expressiva de IMMD nos 15 anos de estudo e tendência a queda neste milênio com estimativa de atingir 65,1% até 2015. Descritores: Mortalidade materna; Políticas públicas; Mulheres; Saúde da mulher/estatística & dados numéricos; Complicações na gravidez/mortalidade; Mortalidade; Sistema Único de Saúde; Estudos epidemiológicos; Saúde da mulher/estatística & dados numéricos; Período pós-parto; Objetivos de desenvolvimento do milênio; Brasil/epidemiologia / Introduction: Maternal mortality is one of the best indicators of socioeconomic development of a country. Brazil has implemented public policies to reduce maternal mortality by 2015. The Grande ABC Paulista region in Brazil shows great socioeconomic heterogeneity among its municipalities, which can reflect the country social inequality, however presenting dimensions that allow greater control of mortality data. Objective: To evaluate the trend of maternal mortality in the Grande ABC Paulista region in the period of 1997-2011. Methodology: Ecological time series, where data was obtained from the database of the Information Technology Department of the Public Health Care System (DATASUS) of the Health Ministry of Brazil (MS). The data was transformed into direct maternal mortality indices (DMMI), stratified by municipalities, Human Development Indices (HDI), causes of maternal death according to the International Classification of Diseases (ICD-10), period and local of maternal death, socio-demographic parameters. Data were submitted to comparison tests (Mann-Whitney U test, Kruskal-Wallis test, followed by Dunn\'s multiple comparisons test) and association tests (linear regression) when applied and a significance of 5%. Results: The DMMI predominated in single women, aged 20-34 years old, white, 4 to 7 school age, in-hospital, postpartum, by bleeding / thrombosis / embolism and eclampsia. There was no difference in DMMI when comparing by HDI group. The Municipality of Rio Grande da Serra reached high DMMI values in the most of the analyzed covariates. São Caetano do Sul presented the lowest DMMI values and was the only municipality which presented decrement in the DMMI during the 15 years of the studied period (beta = - 0.67/year, p=0.03) and a trend in this millennium (2000-2011, beta- 0.55/year, p=0.07) with an estimated fall of 65.61% by 2015. The sum of not investigated, not applied and files without investigation for any analyzed variable exceeded 50%. Conclusion: The DMMI in the Grande ABC Paulista showed high levels and downward trend in time. São Caetano do Sul was the sole municipality where the DMMR dropped in 15 years of study and presented a tendency to decrease in this millennium with an estimated fall of 65.1% by 2015

The purpose of the study is to determine the knowledge of midwives on implementing clinical guidelines for the management of pre-eclampsia with the aim of improving midwifery practice and preventing maternal and neonatal death due to pre-eclampsia. A quantitative, descriptive, cross sectional study design was used for the study. Data was collected using a self-administered questionnaire from 100 midwives working in the maternity section of the clinic referring to the regional hospital in UMgungundlovu District. The Statistical Package for Social Sciences (SPSS) version 23 was used for data analysis. The findings show that respondents to the study have a high mean value (3.6) of knowledge but need support in terms of providing training on the new guidelines. The study also showed that there is need to improve on distribution of guidelines. There was no significant association between demographic factors and the knowledge of midwives on clinical guidelines for the management of pre-eclampsia. A clinical audit of maternity records as well as a quality care project can be developed based on the findings / Health Studies / M.A. (Health Studies)

The endoplasmic reticulum (ER) is a multi-functional cellular compartment that functions in protein folding, lipid biosynthesis, and calcium homeostasis. Perturbations to ER function lead to the dysregulation of ER homeostasis, causing the accumulation of unfolded and misfolded proteins in the cell. This is a state of ER stress. ER stress elicits a cytoprotective, adaptive signaling cascade to mitigate stress, the Unfolded Protein Response (UPR). As long as the UPR can moderate stress, cells can produce the proper amount of proteins and maintain a state of homeostasis. If the UPR, however, is dysfunctional and fails to achieve this, cells will undergo apoptosis. Diabetes mellitus is a group of metabolic disorders characterized by persistent high blood glucose levels. The pathogenesis of this disease involves pancreatic β-cell dysfunction: an abnormality in the primary function of the β-cell, insulin production and secretion. Activation of the UPR is critical to pancreatic β-cell survival, where a disruption in ER stress signaling can lead to cell death and consequently diabetes. There are several models of ER stress leading to diabetes. Wolcott-Rallison syndrome, for example, occurs when there is a mutation in the gene encoding one of the master regulators of the UPR, PKR-like ER kinase (PERK). In this dissertation, we show that Wolfram Syndrome 1 (WFS1), an ER transmembrane protein, is a component of the UPR and is a downstream target of two of the master regulators of the UPR, Inositol Requiring 1 (IRE1) and PERK. WFS1 mutations lead to Wolfram syndrome, a non-autoimmune form of type 1 diabetes accompanied by optical atrophy and other neurological disorders. It has been shown that patients develop diabetes due to the selective loss of their pancreatic β-cells. Here we define the underlying molecular mechanism of β-cell loss in Wolfram syndrome, and link this cell loss to ER stress and a dysfunction in a component of the UPR, WFS1. We show that WFS1 expression is localized to the β-cell of the pancreas, it is upregulated during insulin secretion and ER stress, and its inactivation leads to chronic ER stress and apoptosis. This dissertation also reveals the previously unknown function of WFS1 in the UPR. Positive regulation of the UPR has been extensively studied, however, the precise mechanisms of negative regulation of this signaling pathway have not. Here we report that WFS1 regulates a key transcription factor of the UPR, activating transcription factor 6 (ATF6), through the ubiquitin-proteasome pathway. WFS1 expression decreases expression levels of ATF6 target genes and represses ATF6-mediated activation of the ER stress response (ERSE) promoter. WFS1 recruits and stabilizes an E3 ubiquitin ligase, HMG-CoA reductase degradation protein 1 (HRD1), on the ER membrane. The WFS1-HRD1 complex recruits ATF6 to the proteasome and enhances its ubiquitination and proteasome-mediated degradation, leading to suppression of the UPR under non-stress conditions. In response to ER stress, ATF6 is released from WFS1 and activates the UPR to mitigate ER stress. This body of work reveals a novel role for WFS1 in the UPR, and a novel mechanism for regulating ER stress signaling. These findings also indicate that hyperactivation of the UPR can lead to cellular dysfunction and death. This supports the notion that tight regulation of ER stress signaling is crucial to cell survival. This unanticipated role of WFS1 for a feedback loop of the UPR is relevant to diseases caused by chronic hyperactivation of ER stress signaling network such as pancreatic β-cell death in diabetes and neurodegeneration.

Abstract:<p>Background. This dissertation focuses on HIV-1 mother-to-child transmission (MTCT) as a major global public health issue. It consists of three papers that were published in international peer review journals. We initiated the study to answer the following research question: what was the impact of socioeconomic, clinical and biological risk factors on HIV-1 mother-to-child transmission incidence at Muhima health centre, in the specific context of Rwanda health sector reforms?<p>Methods. A prospective cohort study in Muhima health centre (Rwanda) was used to address the study objectives, with a follow up of 700 mother-infants pairs (2007-2010).<p>Results. The observed overall transmission rate was 3.2% (CI 1.9% – 4.5%) at age 6 weeks of life and 3.7% (CI 2.3% – 5.1%) at 6 months of age. Among the 679 exposed and followed-up infants, a higher risk of HIV-1 MTCT was significantly associated with the following factors: non-disclosure of HIV status to partner; high viral load (HIV-1 RNA); infant mixed feeding before 6 months of age; low mother’s CD4 count and low hemoglobin level during pregnancy.<p>Conclusions. The health sector reforms were found to have led to a conducive environment that was favorable to scaling up of maternal health services in Rwanda (2000-2010).<p>The observed overall MTCT rate of 3.2% (CI 1.9% – 4.5%) at age 6 – weeks postnatal in the Muhima cohort is a significant reduction of MTCT incidence towards achieving the elimination target of < 5% for breastfeeding populations in developing setting.<p>The most relevant factors independently associated with increased risk of mother – to – child transmission of HIV-1 included non-disclosure of HIV status to partner and high HIV-1 RNA. Members of this cohort also showed socioeconomic inequalities, with unmarried status carrying higher risk of undisclosed HIV status. <p>Integrated service delivery for PMTCT/MCH interventions, including community-based approach, task shifting and subsidized membership fees for people living with HIV, were the key national policies implemented to support optimal access to and delivery of evidence – based interventions for prevention of mother – to – child transmission of HIV in Muhima.<p><p>Résumé:<p>Contexte<p><p>Cette thèse porte sur la transmission mère-enfant du VIH-1 comme un problème majeur de santé publique au niveau mondial. Il est composé de 3 publications dans des revues internationales à comité de lecture. Nous avons initié l’étude pour pouvoir répondre à la question de recherche suivante :quel a été l’impact des facteurs de risque socio-économiques, cliniques et biologiques sur l’incidence de la transmission du VIH-1de la mère à l’enfant au centre de santé de Muhima, dans le contexte spécifique des réformes du secteur de la santé au Rwanda.<p>Cadre méthodologique<p><p>Une étude cohorte prospective a été menée au centre de santé de Muhima pour pouvoir répondre aux objectifs de l’étude, avec un suivi de 700 couples mères-enfants éligibles (2007-2010).<p>Résultats<p><p>L’incidence cumulée de transmission mère-enfant du VIH-1 a été de 3,2% (IC 1,9% – 4,5%) à 6 semaines et 3,7% (IC 2,3% – 5,1%) à 6 mois de vie. Parmi les 679 nourrissons exposés et suivis, un risque plus élevé de transmission mère-enfant du VIH-1 était significativement associé aux facteurs suivants :non divulgation du statut séropositif au VIH-1 entre partenaires ;charge virale élevée (ARN-VIH-1) ;allaitement mixte de l’enfant avant 6 mois d’âge ;CD4 bas et taux d’hémoglobine bas pendant la grossesse. <p><p><p><p><p>Conclusions<p><p>Les réformes du secteur ont pu créer un environnement favorable à l’extension des services de santé maternelle (2007-2010).<p>Le taux global 3,2% (IC 1,9 – 4,5) à 6 semaines de vie représente une réduction significative de l’incidence de transmission mère-enfant du VIH-1 pour atteindre le niveau de <5% comme indicateur relatif au plan d’élimination des nouvelles infections VIH chez l’enfant au sein des populations avec allaitement maternel comme pratique universelle.<p>Les facteurs les plus pertinents indépendamment associés à un risque élevé de transmission mère-enfant du VIH-1sont représentés par la non-divulgation du statut séropositif au VIH-1 entre partenaires et la charge virale élevée (ARN-VIH-1). Au sein de cette cohorte, l’on a également pu identifier l’existence d’inégalités socio-économiques, avec le statut de femme seule associé au risque plus élevé de non-divulgation du statut séropositif au VIH-1 entre partenaires.<p>Le service intégré de PTME / interventions de santé de la mère et de l’enfant, y compris l'approche communautaire, l’approche de délégation des tâches et la subvention des frais d'adhésion à la mutuelle de santé pour les personnes vivant avec le VIH, ont été les principales politiques nationales mises en œuvre pour favoriser l'accès optimal et la prestation des interventions basées sur les preuves pour la prévention de la transmission du VIH-1 de la mère à l’enfant au centre de santé de Muhima.<p> / Doctorat en Sciences de la santé publique / info:eu-repo/semantics/nonPublished

Position du problème: <p>La majorité des enfants contaminés par le VIH se retrouve dans les pays en développement. Pour prévenir la transmission verticale les femmes doivent d’abord connaître leur statut sérologique au VIH. En République Démocratique du Congo, le problème posé par la transmission mère-enfant est préoccupant. Pour lutter contre cette transmission verticale, la Prévention de la Transmission du VIH de la Mère à l’Enfant (PTME) est intégrée dans le paquet minimum d’activités de la CPN. Comme dans d’autres pays, la couverture reste toujours insuffisante.<p>Objectifs :<p>Spécifiquement ce travail visait à :(1) déterminer la proportion des femmes qui n’ont pas fait l’objet du dépistage du VIH parmi les accouchées des maternités de Lubumbashi ;(2) évaluer le niveau de connaissance du personnel travaillant dans des maternités en matière des recommandations de la PTME à Lubumbashi ;(3) déterminer l’acceptabilité du dépistage rapide du VIH en salle de travail ;(4) Mettre sur pieds une stratégie pouvant contribuer à atteindre une couverture opérationnelle optimale de la PTME dans des contextes similaires à la ville de Lubumbashi.<p>Méthodologie:<p>C’est une approche de recherche-action réalisée au niveau du système de santé, des prestataires de soins, parturientes et accouchées dans les maternités de Lubumbashi. Pour ce faire deux études transversales et une intervention ont été réalisées à partir d’avril 2010 à février 2011 :les études transversales ont permis de déterminer la proportion des accouchées avec du statut sérologique VIH inconnu et d’évaluer le niveau de Connaissances, Attitudes et Pratiques (Niveau de CAP) des prestataires de soins de salles de travail face aux recommandations de la PTME. L’intervention a consisté à faire le dépistage rapide du VIH chez les parturientes admises en salles de travail.<p>Résultats: <p>Parmi les accouchées, 52,5 % ignoraient leur statut sérologique. Parmi elles, 62,9 % accepteraient de faire le test VIH à la maternité. La proportion des femmes avec un statut sérologique inconnu au VIH était significativement plus élevée chez celles qui n’avaient pas suivi de CPN (Odds Ratio ajusté [ORa] = 5,8; Intervalle de Confiance [IC] 95 % :1,7-19,0) et chez celles qui avaient un bas niveau d’instruction (ORa = 1,5 ;IC 95% :1,1-2,1).<p>Le niveau de CAP de la PTME des prestataires des maternités à Lubumbashi etait suffisant dans seulement 8,5 % des cas. La proportion de prestataires avec un niveau CAP suffisant était significativement plus élevée chez les universitaires que chez les non universitaires (ORa = 8,6; Intervalle de Confiance [IC] 95 % :1,6-47,5) et dans les maternités où la PTME était intégrée (OR = 4,5 ;IC 95 % :1,3-18,4).<p>Sur 474 parturientes, 433 (91,4 % ;IC 95 % :88,4-93,7 %) ont bénéficié d’un dépistage du VIH en salle de travail après counseling. La prévalence du VIH chez les parturientes examinées était de 4,8 %. L’acceptabilité du dépistage rapide du VIH était significativement plus élevée lorsque la durée du counseling était inferieure ou égale à 5 minutes (ORa = 5,8 ;IC 95 % :2,6-13); chez les parturientes qui avaient déclaré ne pas avoir l’objet de dépistage aux CPN (ORa = 3,8 ;IC 95 % :2-7,8) et chez celles qui étaient en début de travail d’accouchement (ORa = 2,3 ;IC 95 % :1,2-4,7). <p>Conclusion :<p>La proportion de femmes qui accouchent sans connaître leur statut sérologique au VIH est encore importante, malgré le fait que le dépistage du VIH soit proposé lors des CPN. C’est un besoin non couvert et une deuxième opportunité manquée. Etant donné qu’il existe à Lubumbashi des structures sanitaires offrant le service de PTME, nous proposons l’approche opt out du dépistage rapide du VIH en salle de travail pour cette catégorie de femmes. Cette stratégie contribuerait à optimiser la couverture opérationnelle du service au moindre coût.<p> <p>Background:<p>The majority of children infected with HIV are found in developing countries. To prevent vertical transmission women must first know their HIV status. In the Democratic Republic of Congo, the problem of mother to child transmission is a concern. To fight against vertical transmission, national policy has included the Prevention of HIV Transmission from Mother to Child Transmission (PMTCT) in the package of activities of the Antenatal care. As in other countries, coverage is still insufficient.<p>Objective:<p>Specifically this study aims to: (1) determine the proportion of women who did not receive HIV testing among women who gave birth in maternity units in Lubumbashi, (2) assess the level of knowledge of staff working in maternity units in the recommendations of PMTCT in Lubumbashi, (3) determine the acceptability of rapid HIV testing in the labor room, (4) develop a strategy to improve the operational coverage of PMTCT in similar contexts to the city of Lubumbashi.<p>Methods:<p>This is an approach to action research conducted at the health system, care providers and parturients and women gave birth in maternity birth in the maternity Lubumbashi. To get two successive cross-sectional studies and intervention was conducted from April 2010 to the end of February 2011: cross-sectional studies have determined the proportion and determinants of birth with unknown HIV status and to evaluate the Level of Knowledge, Attitudes and Practices (KAP level) providers care delivery room in the PMTCT recommendations.<p>The intervention consisted in the rapid HIV testing in parturient admitted to labor wards.<p><p>Results:<p>The analyses of our results showed that among mothers, 52.5% were unaware of their HIV status. Among them, 62.9 % would be tested for HIV to motherhood. The proportion of women with unknown HIV status to HIV was significantly higher in those who had not attended ANC (adjusted odds ratio [aOR] = 5.8, Confidence Interval [CI] 95%: 1.7 - 19) and among those with a low education (aOR 1.5, 95% CI: 1.1 to 2.1).<p>The level of CAP PMTCT providers of maternity was sufficient to Lubumbashi in only 8.5% of cases. The proportion of claimants with a sufficient level CAP was significantly higher among academics than among non-academic (aOR = 8.6, confidence interval [CI] 95%: 1.6 to 47.5) and in maternity wards where PMTCT was integrated (OR = 4.5, 95% CI: 1.3 to 18.4).<p>Among 474 parturients, 433 (91.4% confidence interval [CI] 95%: 88.4 to 93.7%) were voluntary testing for HIV in the labor ward after counseling. HIV prevalence among parturients examined was 4.8%.The acceptability of rapid HIV testing was significantly higher when the duration of counseling was less than or equal to 5 minutes (aOR = 5.8, 95% CI: 2.6 to 13) in parturients who reported not doing this testing for EIC (aOR = 3.8, 95% CI: 2 to 7.8) and among those who were in early labor delivery (aOR = 2.3, 95% CI: 1.2 - 4.7). By cons, it was lower among adolescents than among adults (aOR = 0.1; [CI] 95%: 0.0-0.7).<p>Conclusion:<p>The proportion of women who give birth without knowing their HIV status is still important, despite the fact that HIV testing be made available when the antenatal care. This is an unmet need and would be a missed opportunity. Since there Lubumbashi health facilities offering PMTCT service, we offer the opt-out approach of rapid HIV testing in the labor ward for such women, to optimize coverage of operational service at the lowest cost.<p> <p> <p><p> / Doctorat en Santé Publique / info:eu-repo/semantics/nonPublished