Cardiovascular risk factors in chronic renal failure patient at Soavinandriana Hospital Antananarivo

Background: Cardiovascular disease (CVD) is the primary cause of morbidity and premature mortality in chronic kidney disease (CKD). The aim of this study was to assess the frequency of cardiovascular disease and cardiovascular risk in haemodialysis population for chronic kidney disease.Methods: This was a retrospective and descriptive study for a period of 4 years from January 2016 to December 2019, performed at hemodialysis unit in Soavinandriana Hospital Center Antananarivo, including all patients, following regular hemodialysis for chronic renal failure. Demographic data, cardiovascular disease, cardiovascular risk factors, aetiology of nephropathy, haemoglobin <11 g/dl, phosphocalcic metabolism disorders and uricemia were analyzed.Results: Seventy-six patients were recorded, including 46 males (60.52%) and were women (39.47%). The average age was 59.98 years old. The risk factors of cardiovascular disease were smoking (22.36%), diabetes mellitus (46.05%), high blood pressure (71.05%), dyslipidemia (47.36%) and obesity (11.84%). Fifty-eight patients (76.31%) had a high cardiovascular risk factor. Seventy patients (22.36%) had had a history of cardiovascular diseases. Fifty-nine patients had a haemoglobin concentration under 11 g/dl (77.63%). There were 23 cases of hypocalcemia (30.26%), 22 cases of hyperphosphatemia (28.94%) and 37 cases of hyperuricemia (48.68%).Conclusions: There was a high cardiovascular risk factor in this study population. Early detection of cardiovascular diseases should be done in patients who have a high-risk factor of cardiovascular disease to decrease the mortality rate in chronic kidney diseases population. The appropriate management of modifiable risk factors is important to improve the survival of this study patients

Madagascar’s extraordinary biodiversity: Threats and opportunities

Madagascar's unique biota is heavily affected by human activity and is under intense threat. Here, we review the current state of knowledge on the conservation status of Madagascar's terrestrial and freshwater biodiversity by presenting data and analyses on documented and predicted species-level conservation statuses, the most prevalent and relevant threats, ex situ collections and programs, and the coverage and comprehensiveness of protected areas. The existing terrestrial protected area network in Madagascar covers 10.4% of its land area and includes at least part of the range of the majority of described native species of vertebrates with known distributions (97.1% of freshwater fishes, amphibians, reptiles, birds, and mammals combined) and plants (67.7%). The overall figures are higher for threatened species (97.7% of threatened vertebrates and 79.6% of threatened plants occurring within at least one protected area). International Union for Conservation of Nature (IUCN) Red List assessments and Bayesian neural network analyses for plants identify overexploitation of biological resources and unsustainable agriculture as themost prominent threats to biodiversity. We highlight five opportunities for action at multiple levels to ensure that conservation and ecological restoration objectives, programs, and activities take account of complex underlying and interacting factors and produce tangible benefits for the biodiversity and people of Madagascar

Madagascar’s extraordinary biodiversity: Evolution, distribution, and use

Madagascar's biota is hyperdiverse and includes exceptional levels of endemicity. We review the current state of knowledge on Madagascar's past and current terrestrial and freshwater biodiversity by compiling and presenting comprehensive data on species diversity, endemism, and rates of species description and human uses, in addition to presenting an updated and simplified map of vegetation types. We report a substantial increase of records and species new to science in recent years; however, the diversity and evolution of many groups remain practically unknown (e.g., fungi and most invertebrates). Digitization efforts are increasing the resolution of species richness patterns and we highlight the crucial role of field- and collections-based research for advancing biodiversity knowledge and identifying gaps in our understanding, particularly as species richness corresponds closely to collection effort. Phylogenetic diversity patterns mirror that of species richness and endemism in most of the analyzed groups. We highlight humid forests as centers of diversity and endemism because of their role as refugia and centers of recent and rapid radiations. However, the distinct endemism of other areas, such as the grassland-woodland mosaic of the Central Highlands and the spiny forest of the southwest, is also biologically important despite lower species richness. The documented uses of Malagasy biodiversity are manifold, with much potential for the uncovering of new useful traits for food, medicine, and climate mitigation. The data presented here showcase Madagascar as a unique living laboratory for our understanding of evolution and the complex interactions between people and nature. The gathering and analysis of biodiversity data must continue and accelerate if we are to fully understand and safeguard this unique subset of Earth's biodiversity

The culture history of Madagascar

Madagascar's culture is a unique fusion of elements drawn from the western, northern, and eastern shores of the Indian Ocean, and its past has fascinated many scholars, yet systematic archaeological research is relatively recent on the island. The oldest traces of visitors are from the first century AD. Coastal settlements, with clear evidence of ties to the western Indian Ocean trading network, were established in several places over the next millennium. Important environmental changes of both plant and animal communities are documented over this period, including the extinctions of almost all large animal species. Urban life in Madagascar began with the establishment of the entrepôt of Mahilaka on the northwest coast of the island in the twelfth century. At about the same time, communities with ties to the trade network were established around the island's coasts. From the fourteenth to the sixteenth century, social hierarchies developed in several regions of the island. During the succeeding two centuries, Madagascar saw the development of state polities.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45256/1/10963_2004_Article_BF00997802.pd

Réduction du ruissellement et de l'érosion par les systèmes de culture en semis direct avec couverture végétale pour les cultures pluviales des Hautes Terres malgaches

Sur les hautes terres malgaches, du fait de l'augmentation de la pression foncière sur les rizières, les collines en pente (tanety) sont de plus en plus mises en cultures, généralement avec labour. En climat tropical d'altitude, avec des pluviométries importantes (1200 à 1800 mm/an), les sols majoritairement ferralitiques et pauvres sont fortement soumis à l'érosion qui entraîne la dégradation de leur fertilité et souvent l'ensablement des rizières en contrebas