G. Mercier’s research while affiliated with Université Libre de Bruxelles and other places

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Publications (5)


Concentration–response curve and cumulative effects between ozone and daily mortality: an analysis in Wallonia, Belgium
  • Article

March 2018

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49 Reads

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12 Citations

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Michèle Dramaix

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Many studies have shown an association between ozone and mortality. However, little data is available on the cumulative effects of ozone on health. A time-series analysis using a Poisson regression was used to measure the impact of ozone on non-traumatic mortality in Wallonia over the period 2000–2012. Initially, a single-lag model was tested. Then a distributed-lag non-linear model was used in order to verify the cumulative effects of ozone on mortality. Our study confirms the existence of an association between ozone and mortality. The linear model without threshold shows a higher sensitivity in persons aged 75 and over (ERR = 0.7, 95 % CI: 0.4; 1.0 %) compared to younger people (ages 25–74) (ERR = 0.2, 95 % CI: − 0.2; 0.6 %). Taking cumulative effects into account, men and women aged 25–74 have an ozone sensitivity equivalent to those over 75.


Association entre pollution atmosphérique et infarctus du myocarde sur base de la méthode cas-croisé

March 2015

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74 Reads

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2 Citations

Revue d Épidémiologie et de Santé Publique

Résumé Position du problème De nombreuses études mettent en évidence un lien entre maladie cardiovasculaire et pollution atmosphérique. L’analyse cas-croisé est une méthode permettant d’étudier les effets à court terme de la pollution atmosphérique. Cette étude démontre son intérêt en évaluant l’effet modificateur des saisons ainsi que les effets confondants de différents paramètres environnementaux sur l’association entre pollution atmosphérique et infarctus du myocarde (IDM). Méthodes Les données sur l’IDM de 1999 à 2009 proviennent du registre de l’infarctus du myocarde de Charleroi. Charleroi est une zone géographique de Wallonie relativement polluée avec des niveaux élevés de PM10. Les principaux polluants (PM10, O3, NO2, CO) et la température ont été collectés à partir de cinq stations de mesure de la Région wallonne pour la même période. Une méthode cas-croisé stratifiée sur le temps avec ou sans ajustement sur d’autres paramètres a été utilisée. L’ajustement a été réalisé par appariement des cas et des témoins. Les analyses ont été effectuées pour l’ensemble de l’année ainsi que pour les périodes chaudes et les périodes froides de l’année. Résultats Un total de 3303 cas d’IDM pour la période allant de 1999 à 2009 ont été analysés. Il existe une association entre la concentration en O3 (pour une augmentation de 10 μg/m³) et l’IDM, OR = 1,028 (IC95 % : 1,003–1,054). Les associations les plus fortes sont observées pendant les mois chauds avec un OR = 1,086 (IC95 % : 1,020–1,151) pour les PM10 et un OR = 1,064 (IC95 % : 1,024–1,105) pour l’O3. L’ajustement sur la température diminue l’association entre O3 et l’IDM (OR = 1,003, IC95 % : 0,974–1,032). Par contre, cet ajustement est sans effet sur l’association entre PM10 et l’IDM. L’ajustement sur la concentration en NO2 diminue l’association entre PM10 et IDM. Conclusion Les résultats de cette étude renforcent les preuves des effets à court terme de la pollution atmosphérique sur l’IDM, en particulier pendant la saison chaude. La méthode cas-croisé est un outil approprié pour étudier l’association entre les événements aigus et la pollution atmosphérique. Cette méthode permet un ajustement sur les variables environnementales potentiellement confondantes.


Comparison of four case-crossover study designs to analyze the association between air pollution exposure and acute myocardial infarction

February 2015

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46 Reads

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15 Citations

The case-crossover design is frequently used for analyzing the acute health effects of air pollution. Nevertheless, only a few studies compared different methods for selecting control periods. In this study, the bidirectional method and three time-stratified methods were used to estimate the association between air pollution and acute myocardial infarction (AMI) in Charleroi, Belgium, during 1999-2008. The strongest associations between air pollution and AMI were observed for PM10 and NO2 during the warm period, OR = 1.095 (95 % CI: 1.003-1.169) and OR = 1.120 (95 % CI: 1.001-1.255), respectively. The results of this study reinforce the evidence of the acute effects of air pollution on AMI, especially during the warm season. This study suggests that the different methods of case-crossover study design are suitable to studying the association between acute events and air pollution. The temperature-stratified design is useful to exclude temperature as a potential confounder.


Effets de la pollution particulaire sur le risque de maladies cardiovasculaires

February 2014

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171 Reads

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10 Citations

Annales de Cardiologie et d Angéiologie

The effects of air pollution on health are quite well-documented and the influence of particulate pollution on morbidity and mortality from myocardial infarction and stroke is increasingly evident. The objective of this literature review is to identify and synthesize articles on the impact of air pollution by PM10 and PM2.5 of myocardial infarction and stroke. A total of 14 studies were reported on the effects of PM10 and five on the effects of PM2.5. Nine out of 14 studies for PM10 and two studies of five for PM2.5 have found a significant association with myocardial infarction and/or stroke. Particle composition according to location, study period and population must be considered in interpreting the results on the health effects of air pollution. The integration of these elements is important for decision making in tune with social and economic conditions specific to each environment.


[Particle pollution effects on the risk of cardiovascular diseases.]

August 2013

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18 Reads

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5 Citations

Annales de Cardiologie et d Angéiologie

The effects of air pollution on health are quite well-documented and the influence of particulate pollution on morbidity and mortality from myocardial infarction and stroke is increasingly evident. The objective of this literature review is to identify and synthesize articles on the impact of air pollution by PM10 and PM2.5 of myocardial infarction and stroke. A total of 14 studies were reported on the effects of PM10 and five on the effects of PM2.5. Nine out of 14 studies for PM10 and two studies of five for PM2.5 have found a significant association with myocardial infarction and/or stroke. Particle composition according to location, study period and population must be considered in interpreting the results on the health effects of air pollution. The integration of these elements is important for decision making in tune with social and economic conditions specific to each environment.

Citations (4)


... In the age-stratified analysis, we found that the association between ozone exposure and cardiovascular diseases deaths was more pronounced in individuals aged 65 years and older compared to those under 65 years. Our results are supported by several studies (29,30). It is widely accepted that the older people are at a higher risk and more susceptible to cardiovascular diseases. ...

Reference:

Assessing the impact of short-term ozone exposure on excess deaths from cardiovascular disease: a multi-pollutant model in Nanjing, China’s Yangtze River Delta
Concentration–response curve and cumulative effects between ozone and daily mortality: an analysis in Wallonia, Belgium
  • Citing Article
  • March 2018

... For each case, the day of injury occurrence was defined as a case day while other days of the same weekday within the same calendar month were defined as control days. Since each case was served as its own control in this design, the potential confounders such as age, sex, occupation, education and socioeconomic status of workers would be automatically adjusted by design (27,28). ...

Comparison of four case-crossover study designs to analyze the association between air pollution exposure and acute myocardial infarction
  • Citing Article
  • February 2015

... The contribution of poor air quality to premature mortality and cardiovascular/respiratory diseases has been highlighted by several epidemiological studies (Lefranc, Pascal, Larrieu, Blanchard, Wagner, & Declercq, 2009;Sun, Hong, & Wold, 2010;Hoek, et al., 2013;Zivin & Neidell, 2018). Particulate matter is proven to have the most significant health impacts of all the air pollutants studied (Dockery, 2009;Massamba, Coppieters, Mercier, Collart, & Leveque, 2014). Additionally, aerosols play an important role in visibility degradation, cloud formation, scattering and absorption of solar 13 radiation and human health (Ramanathan, Crutzen, Leliveld, Mitra, & Althausen, 2001;Pope III & Dockery, 2006; Campos-Ramos, Aragon-Pina, Galindo-Estrada, ). ...

Effets de la pollution particulaire sur le risque de maladies cardiovasculaires
  • Citing Article
  • February 2014

Annales de Cardiologie et d Angéiologie

... The association between exposure to fine particles or nitrogen dioxide (NO 2 ) and the onset of an acute coronary disorder has been described on numerous occasions [3,7]. Unlike fine particles, NO 2 does not appear to have a direct effect on cardiovascular pathologies [8]. ...

[Particle pollution effects on the risk of cardiovascular diseases.]
  • Citing Article
  • August 2013

Annales de Cardiologie et d Angéiologie