RESUMEN

COVID-19 dramatically impacted social vulnerable regions at the periphery of large Brazilian cities. Besides, low testing capacity resulted in the lack of proper control measures due inconsistent information on the disease behave. Objectives: to estimate seroprevalence of SARS-CoV-2 antibodies among Baixada Santista Metropolitan Region (RMBS) population and the impacts of social vulnerability and public policies implemented within an iniquity environment. Methods: a quantitative, cross-sectional study, through a serial serological survey and the application of a questionnaire in stratified population sampling and home drew, in nine municipalities of RMBS. Conclusions: Seroprevalence was 1.4% in the first and 2.2% in the second phase, allowing estimating 15 infected people for each case notified in the first phase, and 10 in the following. Lethality was recalculated to 0.40% and 0.48% in each phase, approaching the international rates. Social vulnerable people were the most affected by the pandemic. Informal work, low income, self-reported skin color as black or brown and ambivalent information regarding prevention should be considered as risk factors. Our results reinforce the relevance of social isolation and the adoption of protective economic and social measures especially for social vulnerable populations

A COVID-19 chegou rapidamente na periferia das grandes cidades brasileiras, socialmente mais vulnerável. A baixa capacidade de testagem resulta na adoção de medidas sem informações consistentes sobre o comportamento da doença e interfere na adoção de ações de controle. Objetivos: estimar a prevalência de infecção por SARS-CoV-2 na população da Região Metropolitana da Baixada Santista (RMBS) e analisar impactos da vulnerabilidade social e de políticas públicas implementadas em contextos de desigualdades. Métodos: estudo de caráter quantitativo, transversal, através de inquérito sorológico seriado e aplicação de questionário em amostragem populacional estratificada e coleta domiciliar, nos nove municípios da RMBS. Conclusões: A soroprevalência medida foi de 1,4% na primeira fase e de 2,2 % na segunda permitindo estimar 15 pessoas infectadas para cada caso notificado na primeira fase, e 10 na seguinte. A letalidade foi recalculada para 0,40% e 0,48 % em cada fase, aproximando-se da casuística internacional. Pessoas mais vulneráveis são as mais atingidas pela pandemia, devendo ser consideradas: a informalidade no trabalho, baixa renda, cor da pele auto referida como preta ou parda e informações ambivalentes quanto à prevenção. Os resultados reforçam a importância do isolamento social e de adoção de medidas econômicas e sociais protetivas destinadas às populações vulneráveis.

RESUMEN

BACKGROUND: Hypertension and air pollution are two important risk factors for cardiovascular morbidity and mortality. Although several studies suggest that air pollution has a significant impact on blood pressure, studies on long-term effects are sparse and still controversial. OBJECTIVE: To evaluate the effects of exposure of outdoor workers to different levels of traffic-generated PM2.5 on blood pressure. DESIGN: This is an observational panel study. PARTICIPANTS: 88 non-smoking workers exposed to different concentrations of air pollution were evaluated weekly along four successive weeks. MEASUREMENTS: In each week, personal monitoring of 24-h PM2.5 concentration and 24-h ambulatory blood pressure were measured. The association between blood pressure variables and PM2.5, adjusted for age, body mass index, time in job, daily work hours, diabetes, hypertension and cholesterol was assessed by means of multiple linear regression models fitted by least squares. RESULTS: Exposure to PM2.5 (ranging from 8.5 to 89.7 µg/m3) is significantly and consistently associated with an increase in average blood pressure. An elevation of 10 µg/m3 in the concentration of PM2.5 is associated with increments of 3.9 mm Hg (CI 95% = [1.5; 6.3]) in average systolic 24-h blood pressure for hypertensive and/or diabetic workers. CONCLUSION: Exposure to fine particles, predominantly from vehicular traffic, is associated with elevated blood pressure in hypertensive and/or diabetic workers.

Asunto(s)

RESUMEN

BACKGROUND: Urban air pollutants are associated with cardiovascular events. Traffic controllers are at high risk for pollution exposure during outdoor work shifts. OBJECTIVE: The purpose of this study was to evaluate the relationship between air pollution and systemic blood pressure in traffic controllers during their work shifts. METHODS: This cross-sectional study enrolled 19 male traffic controllers from Santo André city (São Paulo, Brazil) who were 30-60 years old and exposed to ambient air during outdoor work shifts. Systolic and diastolic blood pressure readings were measured every 15 min by an Ambulatory Arterial Blood Pressure Monitoring device. Hourly measurements (lags of 0-5h) and the moving averages (2-5h) of particulate matter (PM(10)), ozone (O(3)) ambient concentrations and the acquired daily minimum temperature and humidity means from the São Paulo State Environmental Agency were correlated with both systolic and diastolic blood pressures. Statistical methods included descriptive analysis and linear mixed effect models adjusted for temperature, humidity, work periods and time of day. RESULTS: Interquartile increases of PM(10) (33 µg/m(3)) and O(3) (49 µg/m(3)) levels were associated with increases in all arterial pressure parameters, ranging from 1.06 to 2.53 mmHg. PM(10) concentration was associated with early effects (lag 0), mainly on systolic blood pressure. However, O(3) was weakly associated most consistently with diastolic blood pressure and with late cumulative effects. CONCLUSIONS: Santo André traffic controllers presented higher blood pressure readings while working their outdoor shifts during periods of exposure to ambient pollutant fluctuations. However, PM(10) and O(3) induced cardiovascular effects demonstrated different time courses and end-point behaviors and probably acted through different mechanisms.

Asunto(s)

RESUMEN

This study observed the relationship between air pollutants and ischemic cardiac diseases such as angina and acute myocardial infarction in a representative cardiovascular center emergency room in São Paulo, Brazil. Daily emergency room admissions to the Institute of the Heart of the University of São Paulo, as well as data concerning daily air pollutant levels and meteorological variables, were collected from January 1994 to August 1995. Generalized additive Poisson regressions were fitted to the logarithm of the expected values of total emergency room visits due to angina or acute myocardial infarction, controlling for smooth functions of season and weather and indicators for days of the week. All investigated pollutants were positively associated with ischemic cardiovascular disease emergency room visits, and the time lags were relatively short, but only CO presented an effect that was statistically significant. An interquartile range increase in CO was associated with an increase of 6.4% (95% CI: 0.7-12.1) in daily angina or acute myocardial infarction emergency room visits. This result did not change when estimates were done using linear models and natural cubic splines. This study showed that air pollution has a role in cardiovascular morbidity in São Paulo, reinforcing the necessity for air pollutant emission-controlling polices in urban areas.

Asunto(s)