Objetive: Determining the risk factors associated with acute renal failure in neonates. Materials and Methods: A case-control study was carried out, in 65 cases of acute renal failure and 65 without acute renal failure in the Intensive Care Unit Neonatals (NICU) of a hospital in Pachuca Hidalgo, Mexico. The variables studied; prematurity, low weight, type I respiratory distress syndrome, perinatal asphyxia, sepsis, necrotizing enterocolitis, administration of vancomycin, amikacin, amphotericin, cefotaxime and water restriction. The information was collected from the data of the clinical records and the analysis was carried out in the Epi-info software. The statistical analysis, it was performed using non-parametric tests such as Chi2 and Fisher's Exact Test. Results: Denote underweight with an OR 2, 95% CI. from 1.1 to 3.3 and <P 0.05 by Chi2 and Fisher's exact test. For; perinatal asphyxia with OR 2.1, 95% CI. from 1.3 to 3.4 and <P 0.05 through Chi2 and Fisher's exact test. For vancomycin administration OR 4.7, 95% CI. From 2.3 to 9.3 and <P 0.05 by Chi2 and Fisher's exact test. For water restriction OR 2, 95% CI. From 1.2 to 3.3 and <P 0.05 by Chi2 and Fisher's exact test. Conclusion: A significant association was found between acute renal failure with low weight, perinatal asphyxia, administration of vancomycin and water restriction.

The use of fluoride (F-) for decreasing the prevalence and incidence of tooth decay was the greatest worldwide preventive public health measure of the 20th century. There have been controversial reports about the benefits of the use of F-, because in small amounts it helps prevent dental caries, but in high concentrations it can be potentially toxic and harmful to dental and systemic health. Since the mid-20th century, F- has been studied by toxicologists, looking at its deleterious effects in human populations. During the last decade, the interest on the undesirable effects has resurfaced because of the knowledge that it interacts with the cellular system, even in low doses, with a very small safety margin. Acute ingestion of toxic amounts of fluoride can cause corrosive gastric mucosa injury. Also respiratory effects such as bleeding, pulmonary edema, tracheostomy and shortness of breath, have been observed in individuals who inhale hydrogen fluoride. Some researchers had shown that F- is an oxidizing agent and a well-known reversible enzymatic inhibitor that interferes with the enzyme activity of at least 80 proteins, can altered the intracellular redox equilibrium, lipid peroxidation, as well as, alteration in the gene expression and apoptosis induction. The primary purpose of this review is to examine findings of the action of inorganic F-, and an overview of hard and soft tissue disturbances, known as fluorosis. The goal of this review is to enhance understanding of the mechanisms by which F- affects cells with an emphasis on human tissue-specific events.