Non-cardiac surgery in developing countries: epidemiological aspects and economical opportunities--the case of Brazil.

BACKGROUND: Worldwide distribution of surgical interventions is unequal. Developed countries account for the majority of surgeries and information about non-cardiac operations in developing countries is scarce. The purpose of our study was to describe the epidemiological data of non-cardiac surgeries performed in Brazil in the last years. METHODS AND FINDINGS: This is a retrospective cohort study that investigated the time window from 1995 to 2007. We collected information from DATASUS, a national public health system database. The following variables were studied: number of surgeries, in-hospital expenses, blood transfusion related costs, length of stay and case fatality rates. The results were presented as sum, average and percentage. The trend analysis was performed by linear regression model. There were 32,659,513 non-cardiac surgeries performed in Brazil in thirteen years. An increment of 20.42% was observed in the number of surgeries in this period and nowadays nearly 3 million operations are performed annually. The cost of these procedures has increased tremendously in the last years. The increment of surgical cost was almost 200%. The total expenses related to surgical hospitalizations were more than $10 billion in all these years. The yearly cost of surgical procedures to public health system was more than $1.27 billion for all surgical hospitalizations, and in average, U$445.24 per surgical procedure. The total cost of blood transfusion was near $98 million in all years and annually approximately $10 million were spent in perioperative transfusion. The surgical mortality had an increment of 31.11% in the period. Actually, in 2007, the surgical mortality in Brazil was 1.77%. All the variables had a significant increment along the studied period: r square (r(2)) = 0.447 for the number of surgeries (P = 0.012), r(2) = 0.439 for in-hospital expenses (P = 0.014) and r(2) = 0.907 for surgical mortality (P = 0.0055). CONCLUSION: The volume of surgical procedures has increased substantially in Brazil through the past years. The expenditure related to these procedures and its mortality has also increased as the number of operations. Better planning of public health resource and strategies of investment are needed to supply the crescent demand of surgery in Brazil.

Brief cognitive battery in the diagnosis of mild Alzheimer's disease in subjects with medium and high levels of education.

There has been an increasing trend to utilize short cognitive batteries for the diagnosis of dementia. Most of these batteries have been designed in countries with high standards of education and are less suitable for populations with low levels of education.We developed a battery that has been previously shown to be highly accurate in the diagnosis of dementia in individuals with low levels of education. The accuracy of this battery for patients with higher levels of education is unknown. OBJECTIVES: To evaluate the accuracy of a brief cognitive battery in the diagnosis of Alzheimer's disease (AD) in subjects with medium and high levels of schooling, and to develop a mathematical model that includes the most discriminative tests. METHODS: Seventy-three mildly demented patients with probable AD and 94 control subjects were evaluated. Sixty patients and 60 controls were randomly selected to generate a mathematical model including the most discriminative tests of the battery using logistic regression. The model was back-tested for the remaining sample of patients and controls. RESULTS: Delayed recall, learning and category fluency tests were included in a mathematical model that obtained an area of 0.917 in the ROC curve in the back-testing. Inter-rater reliabilities of these tests were high (kappa>0.8). CONCLUSIONS: This model showed a high accuracy for the diagnosis of mild AD in patients with medium and high educational levels. Future studies with more heterogeneously educated individuals are necessary to investigate whether the educational level (number of years at school) should also be included in the model.

Existe crescente tendência de se utilizarem baterias cognitivas breves no diagnóstico de demência. A maioria destas tem sido idealizada em países com altos níveis de escolaridade e é menos adequada para populações com baixa escolaridade. Desenvolvemos uma bateria que tem demonstrado alta acurácia no diagnóstico de demência em indivíduos com baixa escolaridade, mas a acurácia em indivíduos com escolaridade alta ainda não é conhecida. OBJETIVOS: Avaliar a acurácia de uma bateria cognitiva breve no diagnóstico de doença de Alzheimer (DA) em indivíduos com escolaridade média ou alta, e desenvolver um modelo matemático que inclua os testes mais discriminativos. MÉTODOS: Setenta e três pacientes com demência leve causada por DA provável e 94 controles foram avaliados com a bateria cognitiva breve. Sessenta pacientes e 60 controles foram selecionados aleatoriamente para gerar um modelo matemático com os testes mais discriminativos, empregando regressão logística. Este modelo foi retro-testado na amostra remanescente de pacientes e controles. RESULTADOS: Os testes de memória tardia, aprendizado e fluência verbal foram incluídos no modelo matemático que obteve área sob a curva ROC de 0,917 no retro-teste. A confiabilidade inter-examinadores destes testes foi alta (kappa>0.8). CONCLUSÕES: Este modelo apresentou alta acurácia no diagnóstico de demência leve na DA em sujeitos com escolaridade média ou alta. Novos estudos com população com maior heterogeneidade educacional são necessários para investigar se os anos de escolaridade também devem ser incluídos no modelo.