A research of the Hospital del Mar in Barcelona confirms that residing in greener environments reduces the risk of strokes by 25%

Pollution increases the risk of stroke, but also the severity of these strokes. Specifically, and according to a study conducted by the Hospital del Mar Institute for Medical Research (IMIM) in Barcelona, living in areas with high noise levels increases the chances of suffering a more serious stroke and more complex consequences by 30%. Instead, residing near green spaces reduces this risk by 25%.

Researchers from IMIM have recruited about 3,000 patients who had been treated at the Hospital del Mar in Barcelona because of a stroke between 2005 and 2014. Scientists had already proven that pollution influenced the risk of stroke, but they wanted to know if noise and air pollution also played a role in the severity of this condition, which is the leading cause of disability in adults.

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Together with scientists from the Barcelona Institute for Global Health and the Brown University (USA), the experts geolocated the patients and analysed their exposure to noise, pollution levels in their surroundings and the proximity to green spaces. Also, data from the Cartographic Institute of Catalonia were used, along with models to analyse pollution levels, the noise map of Barcelona and satellite data to define green areas.

From this investigation it emerged that noise and proximity to green areas influence the greater or lesser severity of the stroke. The average noise level to which the patients included in the trial were exposed were 66 decibels. The World Health Organization (WHO) argues that, over 53 decibels, there may already be health effects.

According to the researchers involved in the study, the origin of this link would be in the inner layer of blood vessels. Stroke is a condition that is characterized by an obstruction of the cerebral vessels and exposure to noise can make that inner layer of the vessels, which is responsible for blood flow, malfunction. In addition, noise increases the peaks of hypertension, which is another parameter related to the risk of stroke.

However, it is not clear what kind of role air pollution plays in the greater or lesser risk of suffering a serious stroke. “Our data is inconclusive because there is no exposure variability,” says the researcher. The levels of contamination to which the patients studied were exposed, all of the reference area of the Hospital del Mar, hardly suffered variations and the data collected does not allow conclusions to be drawn. “Pollution zones have little difference, but we cannot say that pollution does not influence. We must investigate further” adds the researcher.

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