Efficacy of CO lasers in preventing dental caries in partially erupted first permanent molars: a randomized 18-month clinical trial.

The aim of this controlled randomized double-blinded clinical trial was to evaluate the use of a CO2 laser with or without topical application of acidulated fluorides in the prevention of dental caries in partially erupted first permanent molars. We selected 61 healthy children at high risk of caries, all between 6 and 8 (7.1 ± 0.8) years of age and with 4 partially erupted first permanent molars. A CO2 laser device emitting at 10.6 µm was used (0.5 W, 0.05 mJ per pulse, 10 kHz). Each first molar in an individual was randomly assigned to one treatment: (L) CO2 laser (0.066 J/cm2); (FL) 1.23% acidulated fluoride gel and CO2 laser (0.066 J/cm2); (V) 5% fluoride varnish, or (S) sealant (control). Patients were followed-up at 3, 6, 12, and 18 months after treatment, through direct visual examination and by an operator blinded to the treatments (kappa ≥ 0.70). The International Caries Detection and Assessment System (ICDAS-II) index was used to assess the soundness of tooth structure or the presence of white spot lesions, cavitated enamel, and/or dentin lesions. The Yildiz Visual Index was used to evaluate sealant retention. Results were evaluated using Kaplan-Meier survival analysis, and the hazard ratio of the treatments was estimated using shared frailty models with a gamma distribution, which considered the patient as a cluster. There were no significant differences among treatments compared to sealants. After 18 months, the use of a CO2 laser with or without acidulated fluorides was shown to be effective in preventing caries on the occlusal surface of partially erupted permanent first molars in children at high risk for caries.

Costs of topical treatment of pressure ulcer patients.

OBJECTIVE: To evaluate the costs of a topical treatment of pressure ulcer (PU) patients in a hospital unit for treatment of chronic patients in 2014. METHOD: This is an activity-based costing study. This method encompasses the identification, measurement and pricing of physical and human resources consumed for dressings. RESULTS: Procedure costs varied between BRL 16.41 and BRL 260.18. For PUs of the same category, of near areas and with the same type of barrier/adjuvant, the cost varied between 3.5% and 614.6%. For most dressings, the cost increased proportionally to the increase of the area and to the development of PU category. The primary barrier accounted for a high percentage of costs among all items required to the application of dressings (human and material resources). Dressings applied in sacral PUs had longer application times. CONCLUSION: This study allowed us to understand the costs involved in the treatment of PUs, and it may support decision-makers and other cost-effectiveness studies. OBJETIVO: Realizar uma avaliação do custo do tratamento tópico de pacientes com úlceras por pressão (UP), em uma unidade hospitalar de atendimento a pacientes crônicos no ano de 2014. MÉTODO: Trata-se de um estudo de custos baseado no Sistema de custeio Baseado em Atividades. Este método contempla a identificação, mensuração e precificação dos recursos físicos e humanos consumidos para a realização de curativos. RESULTADOS: Os custos dos procedimentos variaram de R$16,41 a R$260,18. Para UP de mesma categoria, de áreas aproximadas e mesmo tipo de cobertura/adjuvante, a variação entre os custos foi de 3,5% a 614,6%. Para a maioria dos curativos, o custo aumentou proporcionalmente ao aumento da área e à progressão da categoria das UP. A cobertura primária representou elevado percentual nos custos entre todos os itens necessários para realizar os curativos (recursos humanos e materiais). Os curativos realizados nas UP sacrais foram os que apresentaram maiores tempos para execução. CONCLUSÃO: Este estudo permitiu conhecer os custos envolvidos no tratamento das UP e pode fornecer subsídios para os tomadores de decisão, assim como para a realização de estudos de custo-efetividade.

Social responsibility: a new paradigm of hospital governance?

Changes in modern societies originate the perception that ethical behaviour is essential in organization's practices especially in the way they deal with aspects such as human rights. These issues are usually under the umbrella of the concept of social responsibility. Recently the Report of the International Bioethics Committee of UNESCO on Social Responsibility and Health has addressed this concept of social responsibility in the context of health care delivery suggesting a new paradigm in hospital governance. The objective of this paper is to address the issue of corporate social responsibility in health care, namely in the hospital setting, emphasising the special governance arrangements of such complex organisations and to evaluate if new models of hospital management (entrepreneurism) will need robust mechanisms of corporate governance to fulfil its social responsiveness. The scope of this responsible behaviour requires hospitals to fulfil its social and market objectives, in accordance to the law and general ethical standards. Social responsibility includes aspects like abstention of harm to the environment or the protection of the interests of all the stakeholders enrolled in the deliverance of health care. In conclusion, adequate corporate governance and corporate strategy are the gold standard of social responsibility. In a competitive market hospital governance will be optimised if the organization culture is reframed to meet stakeholders' demands for unequivocal assurances on ethical behaviour. Health care organizations should abide to this new governance approach that is to create organisation value through performance, conformance and responsibility.

Evaluation of the Removal and Effects of Cylindrospermopsin on Ripened Slow Sand Filters.

The occurrence of toxic blooms of cyanobacteria has been a matter of public health interest due to the cyanotoxins produced by these microorganisms. Cylindrospermopsin (CYN) is a cyanotoxin of particular concern due to its toxic effects on humans. This study investigated the removal and effects of CYN in ripened slow sand filters (SSFs) treating water from Paranoá Lake, Brasilia, Brazil. Four pilot-scale SSFs were ripened and operated for 74 days. Two contamination peaks with CYN were applied along the filtration run. The improvement of any of the evaluated water quality parameters was not affected by the presence of CYN in the raw water. The SSFs efficiently removed CYN, presenting concentrations lower than 0.8 µg/L in the filtered water. The microbiota of the SSFs were dominated by protozoa of the genus Euglypha and amoebas of the genera Arcella, Centropyxis, and Amoeba, together with some groups of rotifers. These microorganisms played a crucial role in removing total coliforms and E. coli. In addition, CYN was not identified as a determining factor in the microbiota composition.

Wastewater-based epidemiology: A Brazilian SARS-COV-2 surveillance experience.

Since 2020, developed countries have rapidly shared both publicly and academically relevant wastewater surveillance information. Data on SARS-CoV-2 circulation is pivotal for guiding public health policies and improving the COVID-19 pandemic response. Conversely, low- and middle-income countries, such as Latin America and the Caribbean, showed timid activities in the Wastewater-Based Epidemiology (WBE) context. In these countries, isolated groups perform viral wastewater monitoring, and the data are unevenly shared or accessible to health agencies and the scientific community. This manuscript aims to highlight the relevance of a multiparty effort involving research, public health, and governmental agencies to support usage of WBE methodology to its full potential during the COVID-19 pandemic as part of a joint One Health surveillance approach. Thus, in this study, we explored the results obtained from wastewater surveillance in different regions of Brazil as a part of the COVID-19 Wastewater Monitoring Network ANA (National Water Agency), MCTI (Ministry of Science, Technology, and Innovations) and MS (Ministry of Health). Over the epidemiological weeks of 2021 and early 2022, viral RNA concentrations in wastewater followed epidemiological trends and variations. The highest viral loads in wastewater samples were detected during the second Brazilian wave of COVID-19. Corroborating international reports, our experience demonstrated usefulness of the WBE approach in viral surveillance. Wastewater surveillance allows hotspot identification, and therefore, early public health interventions. In addition, this methodology allows tracking of asymptomatic and oligosymptomatic individuals, who are generally underreported, especially in emerging countries with limited clinical testing capacity. Therefore, WBE undoubtedly contributes to improving public health responses in the context of this pandemic, as well as other sanitary emergencies.

[Expenses of the Brazilian Ministry of Health for high-cost drugs: a demographic and clinical analysis]. / Gastos do Ministério da Saúde do Brasil com medicamentos de alto custo: uma análise centrada no paciente.

OBJECTIVE: To describe the expenses of the Ministry of Health of Brazil with users of High-Cost Drug Program that began treatment between 2000-2004, according to their demographic and clinical characteristics. METHODS: We made a probabilistic-deterministic linkage of national databases of drugs and mortality, resulting in a historical cohort of patients using high-cost medications in 2000-2004. The per capita spending on medicines were stratified by a follow-up period and described according to demographic, clinical and type of drug used. RESULTS: The total population atended by the program was 611,419, being 63.5% female, average age 46 years. 41.9% of patients living in the Southeast and 29.7% in the Northeast of Brazil. 24.5% of patients began treatment in 2000, 12.4% in 2001, with increasing trend until 2004. The most prevalent diagnosis referred to the genitourinary system diseases and the most common use of chemical groups were antianemic preparations. 40,941 deaths were detected (6.7% of total). The total expenditure per capita was R$4.794,34. Higher spending per capita was observed in males, aged 47, who lived in the Southeast of Brazil and began treatment in 2000, had diagnoses of infectious and parasitic diseases and used blood substitutes and perfusions solutions. CONCLUSION: The understanding of the expenses involved subsidizes restructuring actions and scheduling drug programs, also provides information for therapeutic groups which are priorities for analysis.

Public accountability and sunshine healthcare regulation.

The lack of economic sustainability of most healthcare systems and a higher demand for quality and safety has contributed to the development of regulation as a decisive factor for modernisation, innovation and competitiveness in the health sector. The aim of this paper is to determine the importance of the principle of public accountability in healthcare regulation, stressing the fact that sunshine regulation-as a direct and transparent control over health activities-is vital for an effective regulatory activity, for an appropriate supervision of the different agents, to avoid quality shading problems and for healthy competition in this sector. Methodologically, the authors depart from Kieran Walshe's regulatory theory that foresees healthcare regulation as an instrument of performance improvement and they articulate this theory with the different regulatory strategies. The authors conclude that sunshine regulation takes on a special relevance as, by promoting publicity of the performance indicators, it contributes directly and indirectly to an overall improvement of the healthcare services, namely in countries were citizens are more critical with regard to the overall performance of the system. Indeed, sunshine regulation contributes to the achievement of high levels of transparency, which are fundamental to overcoming some of the market failures that are inevitable in the transformation of a vertical and integrated public system into a decentralised network where entrepreneurialism appears to be the predominant culture.

Oxidation of Cylindrospermopsin by Fenton Process: A Bench-Scale Study of the Effects of Dose and Ratio of H2O2 and Fe(II) and Kinetics.

The cyanotoxin cylindrospermopsin (CYN) has become a significant environmental and human health concern due to its high toxicological potential and widespread distribution. High concentrations of cyanotoxins may be produced during cyanobacterial blooms. Special attention is required when these blooms occur in sources of water intended for human consumption since extracellular cyanotoxins are not effectively removed by conventional water treatments, leading to the need for advanced water treatment technologies such as the Fenton process to produce safe water. Thus, the present study aimed to investigate the application of the Fenton process for the degradation of CYN at bench-scale. The oxidation of CYN was evaluated by Fenton reaction at H2O2/Fe(II) molar ratio in a range of 0.4 to 4.0, with the highest degradation of about 81% at molar ratio of 0.4. Doubling the concentrations of reactants for the optimized H2O2/Fe(II) molar ratio, the CYN degradation efficiency reached 91%. Under the conditions studied, CYN degradation by the Fenton process followed a pseudo-first-order kinetic model with an apparent constant rate ranging from 0.813 × 10-3 to 1.879 × 10-3 s-1.

Healthcare regulation as a tool for public accountability.

The increasing costs of healthcare delivery led to different political and administrative approaches trying to preserve the core values of the welfare state. This approach has well documented weaknesses namely with regard to healthcare rationing. The objective of this paper is to evaluate if independent healthcare regulation is an important tool with regard to the construction of fair processes for setting limits to healthcare. Methodologically the authors depart from Norman Daniels' and James Sabin's theory of accountability for reasonableness and try to determine if new regulatory models-namely independent agencies-perform better with regard to the public disclosure of the reasons and rationales of healthcare rationing. In publicly financed healthcare systems independent regulation is an important tool to assure fair and reasonable procedures of prioritising services. In accordance with the principle of public accountability, independent regulatory agencies are particularly well suited to assure publicity of the decision-making processes, relevance of the rationale involved and particularly mechanisms for challenge and dispute resolution regarding limit setting decisions. It follows that independent healthcare regulation could be regarded not only as an instrument for performance improvement but also as a tool of social justice. The authors conclude by stating that accountability for reasonableness should be regarded as a landmark of any healthcare reform. And therefore regulators have the social task of assuring that the rationales for limit-setting decisions are clearly accessible to the public.

Consumer Willingness to Pay for Dengue Vaccine (CYD-TDV, Dengvaxia®) in Brazil; Implications for Future Pricing Considerations.

Introduction and Objective: Dengue virus is a serious global health problem with an estimated 3.97 billion people at risk for infection worldwide. In December 2015, the first vaccine (CYD-TDV) for dengue prevention was approved in Brazil, developed by Sanofi Pasteur. However, given that the vaccine will potentially be paid via the public health system, information is need regarding consumers' willingness to pay for the dengue vaccine in the country as well as discussions related to the possible inclusion of this vaccine into the public health system. This was the objective of this research. Methods: We conducted a cross-sectional study with residents of Greater Belo Horizonte, Minas Gerais, about their willingness to pay for the CYD-TDV vaccine. Results: 507 individuals were interviewed. These were mostly female (62.4%) had completed high school (62.17%), were working (74.4%), had private health insurance (64.5%) and did not have dengue (67.4%). The maximum median value of consumers' willingness to pay for CYD-TDV vaccine is US$33.61 (120.00BRL) for the complete schedule and US$11.20 (40.00BRL) per dose. At the price determined by the Brazil's regulatory chamber of pharmaceutical products market for the commercialization of Dengvaxia® for three doses, only 17% of the population expressed willingness to pay for this vaccine. Conclusion: Brazil is currently one of the largest markets for dengue vaccine and the price established is a key issue. We believe the manufacturer should asses the possibility of lower prices to reach a larger audience among the Brazilian population.

Dental findings and muscular-skeletal features in Schwartz-Jampel syndrome: case report of two affected siblings.

Schwartz-Jampel syndrome (SJS) is a rare, inherited disorder defined by myotonia, skeletal malformations, muscular stiffness, and growth retardation. The clinical signs and symptoms of SJS are seen in the maxillofacial region. The combination of skeletal and muscular abnormalities predisposes affected individuals to a number of primary and secondary orodental manifestations. Although several studies have discussed the clinical features of SJS from a medical perspective, few reports have addressed the oral findings or dental treatment in children and adolescents with the disorder. This article reviews the dental manifestations and impairments of Schwartz-Jampel syndrome. The case histories of two siblings diagnosed with this disorder are described as well as their dental care.

Avaliação de ultrafiltração como alternativa à flotação por ar dissolvido no pós-tratamento do efluente de lodos ativados — estudo em escala piloto na estação de tratamento de esgoto Brasília norte / Evaluation of ultrafiltration as an alternative to dissolved air flotation for the post-treatment of activated sludge effluent — pilot study in the Brasília norte wastewater treatment plant

RESUMO A melhoria da qualidade dos efluentes das estações de tratamento de esgotos Brasília Norte e Sul tornou-se premente após o corpo receptor dos seus efluentes, o lago Paranoá, passar a ser utilizado como manancial de abastecimento. Este trabalho apresenta estudo comparativo entre o tratamento terciário por ultrafiltração precedido por coagulação em escala piloto e a flotação por ar dissolvido existente na estação de tratamento de esgotos Brasília Norte. A instalação piloto de ultrafiltração e a flotação por ar dissolvido foram alimentadas pela mesma matriz, o efluente da etapa de lodos ativados das estações de tratamento de esgotos Brasília Norte, após coagulação. Foram avaliadas sete condições operacionais da instalação piloto de ultrafiltração variando-se a vazão, o tempo de operação entre limpezas e a duração da limpeza física. O comportamento operacional e a qualidade do efluente produzido foram monitorados. O aumento do fluxo do permeado (de 40,2 para 50,6 e 61,0 L.m−2.h−1) e do tempo de operação entre as limpezas (de 25 para 38 e 50 min), bem como a redução da duração da retrolavagem (de 80 para 60 e 30 s) resultaram em evolução mais intensa da pressão transmembrana. A ultrafiltração foi mais eficiente do que a flotação por ar dissolvido na remoção de turbidez, sólidos suspensos totais, demanda química de oxigênio e fósforo total, com ganho médio de remoção de 9,4, 13,0, 8,5 e 12,8%, respectivamente. Destaca-se a remoção de coliformes na ultrafiltração, 3,4 log superior à da flotação por ar dissolvido. A utilização da ultrafiltração como alternativa à flotação por ar dissolvido apresenta a vantagem de produzir efluente de melhor qualidade, particularmente no aspecto microbiológico, com menor flutuação da qualidade, porém o tratamento e a destinação do lodo produzido pela ultrafiltração devem ser equacionados.

ABSTRACT Improvement in the effluent quality of the Brasília Norte and Brasília Sul wastewater treatment plants became necessary after their effluent receiving body, Paranoá Lake, started being used as source of drinking water for the population of Brasília (Federal District, Brazil). This is a comparative study between the tertiary treatment with ultrafiltration membrane (pilot scale) and the existing dissolved air flotation of Brasília Norte wastewater treatment plant. Both ultrafiltration pilot plant and dissolved air flotation were fed with the same matrix, the effluent of the activated sludge stage of Brasília Norte wastewater treatment plants, after coagulation. Seven operational conditions were evaluated at ultrafiltration pilot plant, with variations in flow rate, time of operation between cleaning processes, and the duration of backwashing. The operational behavior and the quality of the produced effluent were monitored. The increase in permeate flux (from 40.2 to 50.6 and 61.0 L.m−2.h−1) and in the time of operation between cleaning processes (from 25 to 38 and 50 min), as well as the reduction of backwashing duration (from 80 to 60 and 30s), resulted in a more intense evolution of transmembrane pressure. Ultrafiltration was more efficient than dissolved air flotation in the removal of turbidity, total suspended solids, chemical oxygen demand, and total phosphorous, with average gain in removal of 9.4, 13.0, 8.5, and 12.8%, respectively. It is worth mentioning the removal of coliforms by ultrafiltration, which was, on average, 3.4 log higher than that by dissolved air flotation. The use of ultrafiltration as an alternative to dissolved air flotation has the advantage of producing better quality effluent, particularly regarding microbiological aspects, providing lower quality fluctuation; however, treatment and destination of the ultrafiltration waste must be considered.

The effect of the Schwartz-Jampel syndrome on masticatory and facial musculatures--an electromyographic analysis.

This study had the goal to perform an electromyography evaluation of the orbicularis oris, orbicularis oculi, masseter, and temporal muscles of two siblings with Schwartz-Jampel syndrome (SJS), in different clinical activities, comparing them to healthy controls (C). The Schwartz-Jampel syndrome is a rare genetic disorder (71 cases reported in worldwide literature), in which myotonia may be observed in the facial muscles, determining a standard facie that shows an appearance of someone who is sad and weeping For the electromyography (EMG), a Myotronics--K61 electromyographer, was used, with superficial and disposable silver chloride electrodes. By means of the analysis of the obtained results, we observed significant statistical differences for the masseter muscle and for orbicularis oculi muscles (p < 0.01) among the studied groups, in which the individuals with SJS presented greater muscular activity than the normal ones, used as healthy controls. The statistical difference between the two groups was not significant for the temporal muscle, as well as for the orbicularis oris muscle, although the EMG averages were much greater in patients who were bringers of the syndrome. This high muscular activity may be related to the facial osseous alterations, evidenced in both patients with SJS, such as the mandibular migrognathia, with an atrophy of the mandibular cortex and a consequent approximation between the inferior dental root apices and the mandible base, as well as the presence of hypoplastic condyles in terms of size and height.

[Public spending on drugs for the treatment of osteoporosis in post-menopause]. / Gastos públicos com medicamentos para o tratamento da osteoporose na pós-menopausa.

OBJECTIVE: To analyze expenditure on treatment for postmenopausal osteoporosis and associated factors on mean per capita expenditure. METHODS: A probabilistic-deterministic linkage between the database of Authorizations for Highly Complex Procedures and the mortality information system was constructed, resulting in a historical cohort of patients using high-cost medications for the treatment of postmenopausal osteoporosis, between 2000-2006. Mean monthly spending on medicines was stratified by age group and described according to demographic and clinical characteristics and the type of drug used. A linear regression model was used to assess the impact of demographic and clinical characteristics on per capita mean monthly expenditure on medicines. RESULTS: We identified 72,265 women who received drugs for the treatment of postmenopausal osteoporosis. The average monthly expenditure per capita in the first year of treatment was $ 54.02 (sd $ 86.72). The population was predominantly composed of women aged 60-69 years old, who had started treatment in 2000, resident in the Southeast of Brazil, who had previously suffered osteoporotic fractures, and Alendronate sodium was the drug most commonly used at baseline. For most of the patients, the same active ingredient remained in use throughout the treatment period. During the program, 6,429 deaths were identified among participants. More than a third of women remained in treatment for up to 12 months. Raloxifen and calcitonin were the therapeutic alternatives with the greatest impact on the average monthly expenditure on medicine using alendronate sodium as a reference standard. CONCLUSIONS: Due to the high impact of the type of drug used on expenditure on medication, it is recommended that criteria for prescribing and dispensing be established by prioritizing those with lower costs and greater effectiveness in order to optimize the process of pharmaceutical care and provide the population with a greater number of pharmaceutical units.

Incorporated antivirals for chronic hepatitis B in Brazil: a cost-effectiveness analysis.

OBJECTIVE: To evaluate the cost-effectiveness of different drug therapies for chronic hepatitis B in adult patients. METHODS: Using a Markov model, a hypothetical cohort of 40 years for HBeAg-positive or HBeAg-negative patients was constructed. Adefovir, entecavir, tenofovir and lamivudine (with rescue therapy in cases of viral resistance) were compared for treating adult patients with chronic hepatitis B undergoing treatment for the first time, with high levels of alanine aminotransferase, no evidence of cirrhosis and without HIV co-infection. Values for cost and effect were obtained from the literature, and expressed in effect on life years (LY). A discount rate of 5% was applied. Univariate sensitivity analysis was conducted to assess model uncertainties. RESULTS: Initial treatment with entecavir or tenofovir showed better clinical outcomes. The lowest cost-effectiveness ratio was for entecavir in HBeAg-positive patients (R$ 4,010.84/LY) and lamivudine for HBeAg-negative patients (R$ 6,205.08/LY). For HBeAg-negative patients, the incremental cost-effectiveness ratio of entecavir (R$ 14,101.05/LY) is below the threshold recommended by the World Health Organization. Sensitivity analysis showed that variation in the cost of drugs may make tenofovir a cost-effective alternative for both HBeAg-positive and HBeAg-negative patients. CONCLUSIONS: Entecavir is the recommended alternative to start treating patients with chronic hepatitis B in Brazil. However, if there is a reduction in the cost of tenofovir, it can become a cost-effective alternative.

Pharmacoeconomic analysis of strategies to treat postmenopausal osteoporosis: a systematic review.

Osteoporosis, especially in postmenopausal women, has a high socioeconomic impact on the individual and on the society. There are several drugs for its prevention and treatment; however, their effectiveness and costs vary considerably. Several economic assessments have been conducted in order to evaluate the most effective strategies. This study aimed at conducting a systematic review of complete economic assessments focusing on the treatment of postmenopausal osteoporosis performed in Brazil and worldwide. Articles about economic assessment of drugs for the treatment of postmenopausal osteoporosis were searched in the PubMed and LILACS databases. In general, bisphosphonates were the most frequently assessed strategies and had the best incremental cost-effectiveness ratios. Hormone therapy, vitamin D and calcium, strontium ranelate, raloxifene, teriparatide, and denosumab were assessed and showed variable results depending on the perspective of the country and the assumptions made for each study. None of the results could be extrapolated to the Brazilian population, which limits their use by decision makers.

Cost-effectiveness of atypical antipsychotics for the treatment of schizophrenia / Custo-efetividade de antipsicóticos atípicos para o tratamento da esquizofrenia

Objectives: To conduct a cost-effectiveness analysis of second-generation antipsychotics (SGA) for schizophrenia in Brazil. Methods: A Markov model was built for the evaluation of the cost-effectiveness of risperidone, quetiapine, ziprasidone and olanzapine in the Brazilian public health system. The time horizon of the analysis was 18 months. The effectiveness was measured in terms of discontinuation of treatment for any cause and the costs were measured in 2014 BRL and USD. Results: Olanzapine was found to be dominant over the other strategies. The analysis of the optimal choice indicated that olanzapine was recommended, considering a null Willingness-to-Pay (WTP), in 51.8% of the trials. The increase in values of WTP makes the chance of olanzapine to be optimal increase, achieving 100% at approximately 252.00 BRL (114.03 USD) per month of effective treatment. The Probabilistic Sensitivity Analysis (PSA), has shown olanzapine to be optimal in 49.6% of the trials, considering a null WTP. The chance of optimality of olanzapine achieved 100% at a WTP of 364,00 BRL (164.71 USD) per month of effective treatment. The results have shown the importance of prescription costs of olanzapine and hospitalization costs for the Incremental Cost-Effectiveness Ratio (ICER). Conclusion: Olanzapine was found to be dominant over risperidone, quetiapine and ziprasidone, in Brazil. The sensitivity analysis has shown that the cost-effectiveness relationship between olanzapine and risperidone can be modified by the price of purchase of olanzapine. Due to the low values of ICER showed in the sensitivity analysis and PSA, olanzapine can be considered the most cost-effective strategy evaluated.

Objetivos: Este estudo realizou uma análise de custo-efetividade entre antipsicóticos de segunda geração (SGA) para a esquizofrenia no Brasil. Métodos: Foi construído um modelo de Markov baseado na prática clínica, dados de literatura e bases de dados governamentais, comparando custos e efetividade da risperidona, quetiapina, ziprasidona e olanzapina no sistema público de saúde do Brasil. O horizonte temporal da análise foi 18 meses. O desfecho utilizado para avaliação da efetividade foi a descontinuação do tratamento por qualquer causa e os custos foram medidos em BRL e USD (2014). Resultados: A olanzapina foi considerada dominante sobre as outras estratégias avaliadas. A análise indicou que a olanzapina foi considerada ótima, com disposição a pagar (WTP) nula, em 51,8% dos ensaios. O aumento progressivo dos valores de WTP eleva a chance de a olanzapina ser considerada ótima, alcançando 100% em cerca de 252.00 BRL (114,03 USD) por mês deantiptratamento efetivo. Na Análise de Sensibilidade Probabilística (PSA), a olanzapina foi considerada ótima em 49,6% dos ensaios, considerando WTP nula. A chance de a olanzapina ser a escolha ótima atingiu 100% em um WTP de 364,00 BRL (164.71 USD) por mês de tratamento efetivo. Os resultados mostram a importância dos custos de prescrição da olanzapina e de hospitalização para a Razão de Custo-Efetividade Incremental (RCEI). Conclusão: A olanzapina mostrou-se dominante quando comparada a risperidona, quetiapina e ziprasidona, no Brasil. Devido aos baixos valores de RCEI encontrados na análise de sensibilidade e PSA, a olanzapina pode ser considerada a estratégia mais custo-efetiva avaliada.

Thermal alteration and morphological changes of sound and demineralized primary dentin after Er:YAG laser ablation.

The purpose of this study was to assess the influence of Er:YAG laser pulse repetition rate on the thermal alterations occurring during laser ablation of sound and demineralized primary dentin. The morphological changes at the lased areas were examined by scanning electronic microscopy (SEM). To this end, 60 fragments of 30 sound primary molars were selected and randomly assigned to two groups (n = 30); namely A sound dentin (control) and B demineralized dentin. Each group was divided into three subgroups (n = 10) according to the employed laser frequencies: I-4 Hz; II-6 Hz, and III-10 Hz. Specimens in group B were submitted to a pH-cycling regimen for 21 consecutive days. The irradiation was performed with a 250 mJ pulse energy in the noncontact and focused mode, in the presence of a fine water mist at 1.5 mL/min, for 15 s. The measured temperature was recorded by type K thermocouples adapted to the dentin wall relative to the pulp chamber. Three samples of each group were analyzed by SEM. The data were submitted to the nonparametric Kruskal-Wallis test and to qualitative SEM analysis. The results revealed that the temperature increase did not promote any damage to the dental structure. Data analysis demonstrated that in group A, there was a statistically significant difference among all the subgroups and the temperature rise was directly proportional to the increase in frequency. In group B, there was no difference between subgroup I and II in terms of temperature. The superficial dentin observed by SEM displayed irregularities that augmented with rising frequency, both in sound and demineralized tissues. In conclusion, temperature rise and morphological alterations are directly related to frequency increment in both demineralized and sound dentin.

[Cost-effectiveness of nucleoside/nucleotide analogues in chronic hepatitis B]. / Custo-efetividade dos análogos de nucleosídeos/nucleotídeos para hepatite crônica B.

OBJECTIVE: To conduct a cost-effectiveness analysis of drug alternatives with rescue therapy in case of relapse due to viral resistance for the treatment of patients with chronic hepatitis B (CHB). METHODS: Hypothetical cohort of patients with CHB, HBeAg-negative, without clinical or histological evidence of cirrhosis, detectable HBV DNA, histological diagnosis of the disease, positive serum HBsAg for longer than six months, high levels of alanine aminotransferase (ALT) (twice as high as the upper limit of normality) and mean age of 40 years. A Markov model was developed for chronic hepatitis B (HBeAg- negative) with a 40-year time horizon. Costs and benefits were discounted at 5%. Annual rates of disease progression, costs due to complications and the efficacy of medicines were obtained from the literature. One-way and probabilistic sensitivity analysis evaluated uncertainties. RESULTS: Initiation of treatments with entecavir resulted in an increase of 0.35 discounted life-years gained compared to lamivudine. The incremental cost-effectiveness ratio was R$16,416.08 per life-years gained. In the sensitivity analysis, the incremental cost-effectiveness ratio was more sensitive to variation in the probability of transition from chronic hepatitis B to compensated cirrhosis, discount rate and medicine prices (± 10%). In the probabilistic sensitivity analysis, the acceptability curve showed that beginning treatment with entecavir was the most cost-effective alternative in comparison with the use of lamivudine. CONCLUSIONS: The availability of entecavir is economically attractive as part of early treatment for patients with chronic hepatitis B without HIV co-infection.

Hospitalization of schizophrenic patients in the public health system of Minas Gerais, Brazil / Hospitalização de pacientes esquizofrênicos no Sistema Único de Saúde em Minas Gerais, Brasil

Objectives: The aim of this study was to describe the socio-demographic and clinical variables, identify the determinants of length of stay and estimate the cost of inpatient treatment of schizophrenia in Minas Gerais, Brazil. Methods: A non-concurrent cohort was conducted in three psychiatric hospitals of Minas Gerais, Brazil. The data was collected from patients' records in loco. The association between dependent and independent variables was evaluated via linear regression. The costs were calculated through an absorption costing method. Results: 1,928 patients that met the inclusion criteria were identified. Most patients were male, had no life partner, studied no more than the middle school, had no occupation and lived in the city of hospital assistance. Haloperidol was the most prescribed antipsychotic drug. Risperidone was the most used second-generation antipsychotic, followed by olanzapine. Average length of stay was 30.3 days (SD = 37.5 days) and the median was 20 days. Female patients, living in cities other than the hospital's, with involuntary or mandatory hospitalizations and in use of a second-generation antipsychotic (SGA) and a first-generation antipsychotic (FGA) were associated to a longer length of stay. Average cost of hospitalization was R$ 11,713.07 (US$ 5,300.03) per hospitalization. Our results were corroborated by literature data. Conclusion: We found that most schizophrenic inpatients were male, single, had a low educational level and no occupational activity. The longer length of stay was associated to the socio-demographic and clinical variables, sex, place of residence, willingness to hospitalization of the patient and antipsychotic use

Objetivos: O objetivo deste estudo foi descrever as características sociodemográficas e clínicas, identificar os determinantes do tempo de permanência hospitalar e estimar o custo do tratamento hospitalar de pacientes com esquizofrenia em Minas Gerais, Brasil. Métodos: Uma coorte não concorrente foi conduzida em três instituições psiquiátricas de Minas Gerais, Brasil. Dados foram coletados dos prontuários dos pacientes in loco. A associação entre variáveis dependentes e independentes foi avaliada por meio de regressão linear. Os custos foram calculados por um método de Custeio de Absorção. Resultados: 1.928 pacientes foram incluídos no estudo. A maior parte deles era do sexo masculino, não tinha companheiro de vida, estudou até o ensino fundamental, não tinha ocupação e vivia na cidade em que receberam atenção hospitalar. Haloperidol foi o antipsicótico mais prescrito. Risperidona foi o antipsicótico atípico mais utilizado, seguido pela olanzapina. O tempo médio de hospitalização foi de 30,3 dias (DP = 37,5 dias) e a mediana, de 20 dias. Pacientes do sexo feminino, vivendo em cidades diferentes de onde receberam atenção hospitalar, em hospitalização involuntária ou mandatória e em uso de antipsicóticos típicos e atípicos, foram associados a tempos de internação mais longos. O custo médio de hospitalização foi de R$ 11,713.07 (US$ 5,300.03) por hospitalização. Os resultados concordam com dados da literatura. Conclusão: A maior parte dos pacientes com esquizofrenia internados nas instituições avaliadas era do sexo masculino, solteira, tinha baixo nível educacional e não tinha ocupação. O tempo de permanência mais longo foi associado às variáveis sociodemográficas e clínicas, sexo, local de residência, tipo de hospitalização quanto à voluntariedade e o uso de antipsicóticos.