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Área Restrita
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Estudo afirma que Filtros de Ar Reduzem Problemas Cardiovasculares

Data: 04-02-2011

by Tom Scarlett
A new study has found that using air filters
reduces the risk of cardiovascular disease
caused by air pollution.
The investigation, published January 24
in the Journal of the American Thoracic Society’s
American Journal of Respiratory and
Critical Care Medicine, studied adults living
in a small community in British Columbia,
where wood burning stoves are the main
sources of pollution.
It found that high efficiency particle air
(HEPA) filters reduced the amount of airborne
particulate matter, resulting in improved
blood vessel health and reductions
in blood markers that are associated with
an increased risk of cardiovascular disease.
The researchers recruited 45 adults from
25 homes.
Alan Veeck, executive director of the National
Air Filtration Association (NAFA),
said the study confirmed what previous research
has shown.
The researchers “know a lot about when
the air gets dirty outside, and the admissions
to emergency rooms based on asthma and
cardiovascular problems increase.”
NAFA’s Tech Seminar this April in Dallas
will be featuring a keynote address by a
leading researcher on the topic “Cardiovascular
Effects of Inhaled Particles.”
In the study, each participant’s home was
monitored for two consecutive seven-day
periods, during which time a HEPA filter
(Honeywell model 50300) was operated in
the main activity room and a quieter HEPA
filter (Honeywell 18150) was operated in
the participant’s bedroom.
HEPA filters were operated normally during
one seven-day period and without the internal
filters in place during the other period.
The order of filtration or non-filtration
was random and participants did not know
during which period the air was being
filtered. Indoor pollution sampling equipment
was placed in each home’s main activity
Participants were asked to record their activities,
locations and proximity to pollution
sources every 60 minutes. Of the 25 homes
enrolled in the study, 13 had woodstoves in
use during the study period.
At the end of each seven-day period blood
and urine samples were collected from each
participant and markers of cellular injury, as
well as the body’s response to that injury,
were measured.
Endothelial function also was evaluated
using a fingertip device to evaluate blood volume in small blood vessels, and air
samples were collected and analyzed.
After analyzing their data, the researchers
found portable HEPA filters reduced the
average concentrations of fine particulates
inside homes by 60 pc and wood smoke
by 75 pc, and their use was associated with
improved endothelial function (a 9.4 pc increase
in reactive hyperemia index) and decreased
inflammation (a 32.6 pc decrease in
C-reactive protein).
“Our results support the hypothesis that
systemic inflammation and impaired endothelial
function, both predictors of cardiovascular
morbidity, can be favorably
influenced by a reduction of particle concentration
and add to a growing body of
evidence linking short-term exposure to
particulate matter with a systemic inflammatory
response,” said the lead researcher
on the study, Ryan Allen of Simon Fraser
University, in British Columbia.

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