nitrogen-dioxide and Hypertension

Although numerous studies have investigated the association of ambient air pollution with hypertension and blood pressure (BP), the results were inconsistent. We performed a comprehensive systematic review and meta-analysis of these studies. Seven international and Chinese databases were searched for studies examining the associations of particulate (diameter<2.5 μm (PM

Topics: Adult; Air Pollutants; Air Pollution; Blood Pressure; Carbon Monoxide; Cardiovascular Diseases; Environmental Exposure; Humans; Hypertension; Male; Nitrogen Dioxide; Nitrogen Oxides; Odds Ratio; Ozone; Particulate Matter; Regression Analysis; Sulfur Dioxide

Metabolic syndrome (MetS), a major contributor to cardiovascular and metabolic diseases, has been linked with exposure to air pollution. However, the relationship between air pollutants and the five components of MetS [abdominal obesity, elevated triglyceride, decreased high-density lipoprotein cholesterol (HDL-C), elevated blood pressure, and elevated fasting blood glucose levels], has not been clearly described.. We examined the association between long-term exposure to air pollutants and the occurrence of MetS and its components by using a longitudinal cohort in Taiwan.. During the average follow-up period of 3.4 y, the incidence of MetS was 38.1/1,000 person-years. After mutual adjustment and adjustments for potential covariates, the results indicated that every

Topics: Adult; Air Pollutants; Air Pollution; Blood Glucose; Environmental Exposure; Humans; Hypertension; Metabolic Syndrome; Nitrogen Dioxide; Obesity; Obesity, Abdominal; Particulate Matter; Taiwan

Oxidative stress and systemic inflammation are the main pathways by which air pollutants cause hypertension (HTN). Vitamin C intake may reduce the risk of HTN caused by air pollutants. This study aimed to investigate the association between air pollutants and pre-HTN and HTN in Korean adults and whether these associations were modified by vitamin C intake, using data from the 2013-2016 Korean National Health and Nutrition Examination Survey (KNHANES).. Cross-sectional study.. This study used data from the KNHANES VI (2013-2015) and VII (2016) along with the data from the annual air pollution report of the Ministry of Environment.. We included 11,866 adults who had responded to a semi-food frequency questionnaire.. We used survey logistic regression models to evaluate the association of ambient PM10, SO2, NO2, CO, and O3 with pre-HTN and HTN according to vitamin C intake.. After adjusting for potential covariates, exposure to ambient PM10, SO2, NO2, and CO was significantly associated with a high prevalence of pre-HTN and HTN, whereas exposure to O3 was significantly associated with a low prevalence of pre-HTN and HTN. In particular, as the air pollutant scores increased (severe air pollution), the prevalence of pre-HTN and HTN increased in a dose-dependent manner (highest score vs. lowest score, OR=1.85, 95% CI=1.39-2.46, p for trend <.0001). However, these associations were found to be pronounced in adults with low vitamin C intake (highest score vs. lowest score, OR=2.30, 95% CI=1.50-3.54, p for trend <.0001), whereas the statistical significance disappeared for adults with high vitamin C intake (highest score vs. lowest score, OR=1.40, 95% CI=0.93-2.12, p for trend=0.007).. Exposure to air pollutants such as PM10, SO2, NO2, and CO may increase the prevalence of pre-HTN and HTN among Korean adults. In addition, a high intake of vitamin C may help prevent pre-HTN and HTN caused by air pollutants.

Topics: Air Pollutants; Cross-Sectional Studies; Humans; Hypertension; Nitrogen Dioxide; Nutrition Surveys; Particulate Matter; Republic of Korea

Topics: Air Pollutants; Air Pollution; Diabetes Mellitus; Environmental Exposure; Humans; Hypertension; Life Style; Nitrogen Dioxide; Particulate Matter; Prevalence

The association of various air pollutants exposure during adolescence with blood pressure (BP) in young adulthood is uncertain. We intended to evaluate the long-term association of individual and joint air pollutants exposure during adolescence with BP in young adulthood. This cross-sectional study of incoming students was conducted in five geographically disperse universities in China during September and October 2018. Mean concentrations of particulate matter with diameters ≤2.5 μm (PM

Topics: Adolescent; Air Pollutants; Blood Pressure; China; Cross-Sectional Studies; Environmental Exposure; Environmental Pollutants; Humans; Hypertension; Nitrogen Dioxide; Particulate Matter; Young Adult

The assessment of the generalization of the strict hypertension definition in the 2017 ACC/AHA Hypertension Guideline from environmental condition remains sparse. The aims of this study are to investigate and compare the associations of ambient air pollution and traffic-related pollution (TRP) with hypertension defined by the different criteria. A total of 32,135 participants were recruited from the baseline survey of the CHCN-BTH in 2017. We defined hypertension as SBP/DBP ≥ 140/90 mmHg according to the hypertension guidelines in China, Japan, Europe and ISH (traditional criteria) and defined as SBP/DBP ≥ 130/80 mmHg according to the 2017 ACC/AHA Hypertension Guideline (strict criteria). A two-level generalized linear mixed models were applied to investigate the associations of air pollutants (i.e. PM

Topics: Air Pollutants; Air Pollution; Blood Pressure; China; Environmental Exposure; Humans; Hypertension; Nitrogen Dioxide; Particulate Matter; Traffic-Related Pollution

Topics: Acetaldehyde; Air Pollutants; Air Pollution; Benzene; Cross-Sectional Studies; Female; Formaldehyde; Fossil Fuels; Humans; Hypertension; Nitrogen Dioxide; Particulate Matter

Ambient air pollution is one of the most important global health issues. Although several studies have been reported the associations between air pollution and brain function or structure, impact of the air pollution on cerebral small vessel disease (cSVD) have rarely been explored in Asian adult population. We evaluated the association between exposure to air pollutants and cSVD in Korean asymptomatic adults. This cross-sectional study included 3257 participants of a health screening program from January 2006 to December 2013. All participants performed brain magnetic resonance imaging. To assess the cSVD, we considered three features such as white matter hyperintensities (WMH), silent lacunar infarction (SLI), and cerebral microbleeds (CMBs). The annual average exposure to air pollutants [particulate matter ≤ 10 μm in aerodynamic diameter (PM

Topics: Adult; Air Pollutants; Cerebral Small Vessel Diseases; Cross-Sectional Studies; Female; Humans; Hypertension; Male; Middle Aged; Nitrogen Dioxide; Stroke, Lacunar

Evidence suggests that residential greenness may be protective of high blood pressure, but there is scarcity of evidence on the associations between greenness around schools and blood pressure among children. We aimed to investigate this association in China. Our study included 9354 children from 62 schools in the Seven Northeastern Cities Study. Greenness around each child's school was measured by NDVI (Normalized Difference Vegetation Index) and SAVI (Soil-Adjusted Vegetation Index). Particulate matter ≤ 1 μm (PM

Topics: Air Pollution; Blood Pressure; Child; China; Cities; Environmental Exposure; Female; Humans; Hypertension; Male; Nitrogen Dioxide; Obesity; Particulate Matter; Risk; Schools; Sustainable Development

Studies on the hypertensive effect of long-term air pollution exposure were inconclusive and showed scarce evidence from rural areas in developing countries. In this context, we examined the associations of air pollution exposure with hypertension and blood pressure, and their effect modifiers in rural Chinese adults.. We studied 39,259 participants from a cohort established in five rural regions of central China. Individual exposures to PM. The results showed that for each 1 μg/m. Long-term exposure to PM

Topics: Adult; Air Pollutants; Air Pollution; Blood Pressure; China; Diabetes Mellitus, Type 2; Environmental Exposure; Female; Humans; Hypertension; Male; Nitrogen Dioxide; Particulate Matter

Previous studies reported that long-term exposure to traffic-related air pollution may increase the incidence of hypertension and diabetes. However, little is known about the associations of ultrafine particles (≤0.1 μm in diameter) with these two conditions.. We conducted a population-based cohort study to investigate the associations between exposures to ultrafine particles and nitrogen dioxide (NO2) and the incidence of diabetes and hypertension. Our study population included all Canadian-born residents aged 30 to 100 years who lived in the City of Toronto, Canada, from 1996 to 2012. Outcomes were ascertained using validated province-wide databases. We estimated annual concentrations of ultrafine particles and NO2 using land-use regression models and assigned these estimates to participants' annual postal code addresses during the follow-up period. Using random-effects Cox proportional hazards models, we calculated hazard ratios (HRs) and 95% confidence intervals (CIs) for ultrafine particles and NO2, adjusted for individual- and neighborhood-level covariates. We considered both single- and multipollutant models.. Each interquartile change in exposure to ultrafine particles was associated with increased risk of incident hypertension (HR = 1.03; 95% CI = 1.02, 1.04) and diabetes (HR = 1.06; 95% CI = 1.05, 1.08) after adjusting for all covariates. These results remained unaltered with further control for fine particulate matter (≤2.5 μm; PM2.5) and NO2. Similarly, NO2 was positively associated with incident diabetes (HR = 1.06; 95% CI = 1.05, 1.07) after controlling for ultrafine particles and PM2.5.. Exposure to traffic-related air pollution including ultrafine particles and NO2 may increase the risk for incident hypertension and diabetes. See video abstract at, http://links.lww.com/EDE/B337.

Topics: Adult; Aged; Aged, 80 and over; Air Pollution; Canada; Cohort Studies; Diabetes Mellitus; Environmental Exposure; Female; Humans; Hypertension; Inhalation Exposure; Male; Middle Aged; Nitrogen Dioxide; Particle Size; Particulate Matter

Numerous studies have evaluated the effects of long-term exposure to ambient air pollution on hypertension. However, little information exists regarding its effects on prehypertension, a very common, but understudied cardiovascular indicator. We evaluated data from 24,845 adults (ages 18-74 years) living in three Northeastern Chinese cities in 2009. Blood pressure (BP) was measured by trained observers using a standardized mercuric-column sphygmomanometer. Three-year (from 2006 to 2008) average concentrations of particles with an aerodynamic diameter ≤10 μm (PM

Topics: Adult; Aged; Air Pollutants; Air Pollution; Asian People; Blood Pressure; China; Cities; Environmental Exposure; Female; Humans; Hypertension; Male; Middle Aged; Nitrogen Dioxide; Odds Ratio; Ozone; Particulate Matter; Prehypertension; Public Health; Regression Analysis; Sulfur Dioxide

Evidence shows that exposure to air pollutants can increase blood pressure in the short and long term. Some studies show higher levels of hypertension prevalence in areas of high pollution. Few data exist on the association of air pollution with hypertension incidence. The purpose of the present study was to prospectively assess the associations of the traffic-related nitrogen dioxide (NO2) and of ozone with the incidence of hypertension in the Black Women's Health Study (BWHS), a large cohort study of African American women.. We used Cox proportional hazards models to calculate hazard ratios (HRs) and 95% confidence intervals (CI) for hypertension associated with exposure to NO2 and ozone among 33,771 BWHS participants. NO2 and ozone levels at participant residential locations were estimated with validated models.. From 1995 to 2011, 9,570 incident cases of hypertension occurred in a total of 348,154 person-years (median follow-up time, 11 years). The multivariable HRs per interquartile range of NO2 (9.7 ppb) and ozone (6.7 ppb) were 0.92 (95% CI = 0.86, 0.98) and 1.09 (95% CI = 1.00, 1.18).. In this large cohort of African American women, higher ozone levels were associated with an increase in hypertension incidence. Higher NO2 levels were not associated with greater hypertension incidence; indeed, incidence was lower at higher NO2 levels.

Topics: Adult; Aged; Air Pollution; Black or African American; Environmental Exposure; Female; Follow-Up Studies; Humans; Hypertension; Incidence; Middle Aged; Multivariate Analysis; Nitrogen Dioxide; Ozone; Proportional Hazards Models; Time Factors; Young Adult

Within urban air sheds, specific ambient air pollutants typically peak at predictable times throughout the day. For example, in environments dominated by mobile sources, peak nitrogen dioxide (NO2) levels coincide with morning and afternoon rush hours, while peak levels of ozone (O3), occur in the afternoon.. Given that exposure to a single pollutant might sensitize the cardiopulmonary system to the effects of a subsequent exposure to a second pollutant, we hypothesized that a morning exposure to NO2 will exaggerate the cardiovascular effects of an afternoon O3 exposure in rats.. Rats were divided into four groups that were each exposed for 3 h in the morning (m) and 3 h in the afternoon (a) on the same day: (1) m-Air/a-Air, (2) m-Air/a-O3 (0.3 ppm), (3) m-NO2 (0.5 ppm)/a-Air and (4) m-NO2/a-O3. Implanted telemetry devices recorded blood pressure and electrocardiographic data. Sensitivity to the arrhythmogenic agent aconitine was measured in a separate cohort.. Only m-NO2/a-O3-exposed rats had significant changes in electrophysiological, mechanical and autonomic parameters. These included decreased heart rate and increased PR and QTc intervals and increased heart rate variability, suggesting increased parasympathetic tone. In addition, only m-NO2/a-O3 exposure decreased systolic and diastolic blood pressures and increased pulse pressure and QA interval, suggesting decreased cardiac contractility.. The findings indicate that initial exposure to NO2 sensitized rats to the cardiovascular effects of O3 and may provide insight into the epidemiological data linking adverse cardiovascular outcomes with exposures to low concentrations of O3.

Topics: Aconitine; Administration, Inhalation; Air Pollutants; Animals; Arrhythmias, Cardiac; Blood Pressure; Electrocardiography; Heart Rate; Hypertension; Male; Nitrogen Dioxide; Ozone; Rats; Rats, Inbred SHR

Prenatal exposure to ambient air pollution has been associated with adverse birth outcomes, but the potential modifying effect of maternal comorbidities remains understudied. Our objective was to investigate whether associations between prenatal air pollution exposures and birth outcomes differ by maternal comorbidities.. A total of 818,400 singleton live births were identified in the province of Ontario, Canada from 2005 to 2012. We assigned exposures to fine particulate matter (PM2.5), nitrogen dioxide (NO2) and ozone (O3) to maternal residences during pregnancy. We evaluated potential effect modification by maternal comorbidities (i.e. asthma, hypertension, pre-existing diabetes mellitus, heart disease, gestational diabetes and preeclampsia) on the associations between prenatal air pollution and preterm birth, term low birth weight and small for gestational age.. Interquartile range (IQR) increases in PM2.5 (2μg/m(3)), NO2 (9ppb) and O3 (5ppb) over the entire pregnancy were associated with a 4% (95% CI: 2.4-5.6%), 8.4% (95% CI: 5.5-10.3%) and 2% (95% CI: 0.5-4.1%) increase in the odds of preterm birth, respectively. Increases of 10.6% (95% CI: 0.2-2.1%) and 23.8% (95% CI: 5.5-44.8%) in the odds of preterm birth were observed among women with pre-existing diabetes while the increases were of 3.8% (95% CI: 2.2-5.4%) and 6.5% (95% CI: 3.7-8.4%) among women without this condition for pregnancy exposure to PM2.5 and NO2, respectively (Pint<0.01). The increase in the odds of preterm birth for exposure to PM2.5 during pregnancy was higher among women with preeclampsia (8.3%, 95% CI: 0.8-16.4%) than among women without (3.6%, 95% CI: 1.8-5.3%) (Pint=0.04). A stronger increase in the odds of preterm birth was found for exposure to O3 during pregnancy among asthmatic women (12.0%, 95% CI: 3.5-21.1%) compared to non-asthmatic women (2.0%, 95% CI: 0.1-3.5%) (Pint<0.01). We did not find statistically significant effect modification for the other outcomes investigated.. Findings of this study suggest that associations of ambient air pollution with preterm birth are stronger among women with pre-existing diabetes, asthma, and preeclampsia.

Topics: Adult; Air Pollutants; Air Pollution; Asthma; Comorbidity; Diabetes Mellitus; Female; Heart Diseases; Humans; Hypertension; Infant, Newborn; Male; Maternal Exposure; Nitrogen Dioxide; Ontario; Ozone; Particulate Matter; Pre-Eclampsia; Pregnancy; Premature Birth; Young Adult

To study the association of air pollution with health service demand of the elderly and middle-age patients with cardiovascular and cerebrovascular diseases, and to provide a scientific basis for development of environmental protection policy and health service policy of the Chinese government.. This study included survey data on self-evaluated health, outpatient service demand and inpatient service demand of the patients with hypertension, heart disease and stroke in 62 cities of 17 provinces from China Health and Retirement Longitudinal Study (CHARLS) in 2011 and 2013, and combined it with the data on the annual concentrations of inhalable particulate matter (PM(10)), sulfur dioxide(SO(2)) and nitrogen dioxide (NO(2)) of those provinces and cities. Conditional Logistic regression was carried out to assess the possible effects of air pollutants on self-evaluated health and health service utilization.. The results showed that turning points existed in the effects of concentrations of NO(2) and SO(2) on the health service demand of the patients with hypertension, heart disease and stroke. The inpatient service demand of the hypertension patients increased with NO(2) concentration when it was lower than 35.1 μg/m(3) and decreased with NO(2) concentration for higher value. Self-evaluated health of the patients with heart disease and stroke decreased with SO(2) concentration when it was lower than 63.8 μg/m(3) and increased with SO(2) concentration for higher value. In addition, no evidence was found for the association between PM(10) and health service demand.. Air pollution may have effects on health service demand of the patients with hypertension,cardiovascular and cerebrovascular diseases, and different air pollutants at high or low concentration may have different health effects.

Topics: Aged; Air Pollutants; Air Pollution; Cerebrovascular Disorders; China; Cities; Health Services; Health Services Needs and Demand; Humans; Hypertension; Longitudinal Studies; Middle Aged; Nitrogen Dioxide; Particulate Matter; Stroke; Sulfur Dioxide

Both low temperature and high air pollution have been associated with an increased risk of cardiovascular events, which could be predicted by increased arterial blood pressure (BP) within short periods. However, whether exposures to temperature and air pollution simultaneously may have interactive effects on BP has been unknown. We investigated this potential interaction during 460 repeated visits in 39 healthy university students in the context of traffic-related air pollution.. Study participants in the Healthy Volunteer Natural Relocation study underwent repeated BP measurements for 12 occasions under three exposure scenarios in Beijing, China, in 2010-2011. We used generalized linear mixed-effects models to estimate exposure effects.. Decreasing temperature was associated with significant increases in BP. There were significant interactions between temperature and traffic-related air pollutants (particulate matter with an aerodynamic diameter ≤2.5 μm, organic carbon, elemental carbon and nitrogen dioxide) on BP (P < 0.05 for all interaction tests). The estimated increases in SBP and DBP were 4.9 mmHg [95% confidence interval (CI) 2.9-6.8] and 3.7 mmHg (95% CI 2.3-5.1) at high elemental carbon level (≥median), and were -1.3 mmHg (95% CI -6.3 to 3.6) and 0.7 mmHg (95% CI -2.8 to 4.2) at low elemental carbon level (

Topics: Adult; Air Pollutants; Air Pollution; Beijing; Blood Pressure; Carbon; Environmental Exposure; Healthy Volunteers; Humans; Hypertension; Linear Models; Male; Nitrogen Dioxide; Particulate Matter; Temperature; Vehicle Emissions

Long-term exposure to traffic-related air pollution may increase blood pressure (BP) and induce hypertension. However, evidence supporting these associations is limited, and they may be confounded by exposure to traffic noise and biased due to inappropriate control for use of BP-lowering medications.. We evaluated the associations of long-term traffic-related air pollution with BP and prevalent hypertension, adjusting for transportation noise and assessing different methodologies to control for BP-lowering medications.. We measured systolic (SBP) and diastolic BP (DBP) at baseline (years 2003-2005) in 3,700 participants, 35-83 years of age, from a population-based cohort in Spain. We estimated home outdoor annual average concentrations of nitrogen dioxide (NO2) with a land-use regression model. We used multivariate linear and logistic regression.. A 10-μg/m3 increase in NO2 levels was associated with 1.34 mmHg (95% CI: 0.14, 2.55) higher SBP in nonmedicated individuals, after adjusting for transportation noise. Results were similar in the entire population after adjusting for medication, as commonly done, but weaker when other methods were used to account for medication use. For example, when 10 mmHg were added to the measured SBP levels of medicated participants, the association was β = 0.78 (95% CI: -0.43, 2.00). NO2 was not associated with hypertension. Associations of NO2 with SBP and DBP were stronger in participants with cardiovascular disease, and the association with SBP was stronger in those exposed to high traffic density and traffic noise levels ≥ 55 dB(A).. We observed a positive association between long-term exposure to NO2 and SBP, after adjustment for transportation noise, which was sensitive to the methodology used to account for medication.

Topics: Air Pollutants; Air Pollution; Blood Pressure; Female; Humans; Hypertension; Male; Nitrogen Dioxide; Spain

Traffic noise has been associated with prevalence of hypertension, but reports are inconsistent for blood pressure (BP). To ascertain noise effects and to disentangle them from those suspected to be from traffic-related air pollution, it may be essential to estimate people's noise exposure indoors in bedrooms.. We analyzed associations between long-term exposure to indoor traffic noise in bedrooms and prevalent hypertension and systolic (SBP) and diastolic (DBP) BP, considering long-term exposure to outdoor nitrogen dioxide (NO2).. We evaluated 1,926 cohort participants at baseline (years 2003-2006; Girona, Spain). Outdoor annual average levels of nighttime traffic noise (Lnight) and NO2 were estimated at postal addresses with a detailed traffic noise model and a land-use regression model, respectively. Individual indoor traffic Lnight levels were derived from outdoor Lnight with application of insulations provided by reported noise-reducing factors. We assessed associations for hypertension and BP with multi-exposure logistic and linear regression models, respectively.. Median levels were 27.1 dB(A) (indoor Lnight), 56.7 dB(A) (outdoor Lnight), and 26.8 μg/m3 (NO2). Spearman correlations between outdoor and indoor Lnight with NO2 were 0.75 and 0.23, respectively. Indoor Lnight was associated both with hypertension (OR = 1.06; 95% CI: 0.99, 1.13) and SBP (β = 0.72; 95% CI: 0.29, 1.15) per 5 dB(A); and NO2 was associated with hypertension (OR = 1.16; 95% CI: 0.99, 1.36), SBP (β = 1.23; 95% CI: 0.21, 2.25), and DBP (β⊇= 0.56; 95% CI: -0.03, 1.14) per 10 μg/m3. In the outdoor noise model, Lnight was associated only with hypertension and NO2 with BP only. The indoor noise-SBP association was stronger and statistically significant with a threshold at 30 dB(A).. Long-term exposure to indoor traffic noise was associated with prevalent hypertension and SBP, independently of NO2. Associations were less consistent for outdoor traffic Lnight and likely affected by collinearity.

Topics: Adult; Aged; Aged, 80 and over; Air Pollutants; Air Pollution; Cohort Studies; Environmental Exposure; Female; Housing; Humans; Hypertension; Linear Models; Male; Middle Aged; Nitrogen Dioxide; Noise, Transportation; Spain

Little is known about the association between air pollution and hypertension among children, and no studies report whether breastfeeding modifies this association in children.. Nine thousand three hundred fifty-four Chinese children, ages 5-17 years old, from 24 elementary schools and 24 middle schools in the Seven Northeastern Cities during 2012-2013 were evaluated. The weight, height, and BP were measured. Four-year average concentrations of particles with an aerodynamic diameter of ≤10 μm (PM10), sulfur dioxide (SO2), nitrogen dioxides (NO2), ozone (O3), and carbon monoxide (CO) were calculated from monitoring stations. Two-level regression analysis was used to examine the effects, controlling for covariates.. The results showed that associations existed between hypertension and pollutants. The odds ratios for hypertension ranged from 1.12 per 46.3 μg/m3 increase for O3 (95% confidence interval [CI], 1.10-1.13) to 1.68 per 30.6 μg/m3 increase for PM10 (95% CI, 1.53-1.86). The increases in mean diastolic BP ranged from 0.58 mm Hg per 46.3 μg/m3 increase for O3 (95% CI, 0.52-0.63 mm Hg) to 2.89 mm Hg per 563.4 μg/m3 increase for CO (95% CI: 2.53-3.24 mm Hg). The increase in systolic BP ranged from 0.50 mm Hg per 46.3 μg/m3 increase for O3 (95% CI: 0.43-0.57 mm Hg) to 2.10 mm Hg per 30.6 μg/m3 increase for PM10 (95% CI, 1.73-2.47 mm Hg). Compared with children who had been breastfed, non-breastfed children exhibited consistently stronger effects.. Study findings indicate that high levels of PM10, SO2, NO2, O3, and CO are associated with increased arterial BP and hypertension among the children. Breastfeeding may reduce the risk.

Topics: Adolescent; Air Pollutants; Air Pollution; Blood Pressure; Body Height; Body Weight; Breast Feeding; Carbon Monoxide; Child; Child, Preschool; China; Cities; Cross-Sectional Studies; Female; Humans; Hypertension; Male; Nitrogen Dioxide; Ozone; Prevalence; Sulfur Dioxide

Several studies have investigated the short-term effects of ambient air pollutants in the development of high blood pressure and hypertension. However, little information exists regarding the health effects of long-term exposure. To investigate the association between residential long-term exposure to air pollution and blood pressure and hypertension, we studied 24 845 Chinese adults in 11 districts of 3 northeastern cities from 2009 to 2010. Three-year average concentration of particles with an aerodynamic diameter ≤10 µm (PM(10)), sulfur dioxide (SO(2)), nitrogen dioxides (NO(2)), and ozone (O(3)) were calculated from monitoring stations in the 11 districts. We used generalized additive models and 2-level logistic regressions models to examine the health effects. The results showed that the odds ratio for hypertension increased by 1.12 (95% confidence interval [CI], 1.08-1.16) per 19 μg/m(3) increase in PM(10), 1.11 (95% CI, 1.04-1.18) per 20 μg/m(3) increase in SO(2), and 1.13 (95% CI, 1.06-1.20) per 22 μg/m(3) increase in O(3). The estimated increases in mean systolic and diastolic blood pressure were 0.87 mm Hg (95% CI, 0.48-1.27) and 0.32 mm Hg (95% CI, 0.08-0.56) per 19 μg/m(3) interquartile increase in PM(10), 0.80 mm Hg (95% CI, 0.46-1.14) and 0.31 mm Hg (95% CI, 0.10-0.51) per 20 μg/m(3) interquartile increase in SO(2), and 0.73 mm Hg (95% CI, 0.35-1.11) and 0.37 mm Hg (95% CI, 0.14-0.61) per 22 μg/m(3) interquartile increase in O(3). These associations were only statistically significant in men. In conclusion, long-term exposure to PM(10), SO(2), and O(3) was associated with increased arterial blood pressure and hypertension in the study population.

Topics: Adult; Air Pollutants; Air Pollution; Blood Pressure; China; Cities; Female; Humans; Hypertension; Incidence; Male; Middle Aged; Models, Biological; Nitrogen Dioxide; Ozone; Particulate Matter; Prevalence; Sex Factors; Sulfur Dioxide

Numerous studies have reported associations between air pollution and cardiovascular diseases. While several studies illustrate that exposures to air pollutants can elevate blood pressure, few have evaluated the clinical relevance of this relationship. Hence, we aimed to explore the associations between daily concentrations of several air pollutants and emergency department visits for hypertension.. Odds ratios (ORs) for emergency department visits for hypertension in Edmonton, Canada, from April 1992 to March 2002 were associated with pollutant levels (CO, NO(2), SO(2), O(3), and particulate matter [PM] < 10 microns [PM(10)] and < 2.5 microns [PM(2.5)] in aerodynamic diameter, respectively) by means of a case-crossover technique with time-stratified strategy to define controls. The analysis was performed for all (N = 5365), male (N = 2069), and female (N = 3296) patients and for six air pollutants lagged by 0 to 9 days. ORs and their 95% confidence intervals (CIs) were reported for an increase in an interquartile range (IQR) for each pollutant.. We observed associations for all patients and levels of NO(2) (IQR = 12.8 parts per billion; OR, 1.06; 95% CI, 1.00-1.12), SO(2) (IQR = 2.3 parts per billion; OR, 1.04; 95% CI, 1.00-1.08), and PM(10) (IQR = 15.0 μg/m(3); OR, 1.06; 95% CI, 1.01-1.11) for lag day 3, as well as for PM(10) (IQR = 15.0 μg/m(3); OR, 1.06; 95% CI, 1.01-1.11) and PM(2.5) (IQR = 6.2 μg/m(3); OR, 1.07; 95% CI, 1.01-1.11) for lag day 6.. These findings support the contention that ambient pollution can produce clinically meaningful increases in blood pressure.

Topics: Adult; Age Factors; Aged; Aged, 80 and over; Air Pollutants; Blood Pressure Determination; Canada; Confidence Intervals; Cross-Sectional Studies; Databases, Factual; Emergencies; Emergency Service, Hospital; Environmental Exposure; Environmental Monitoring; Epidemiological Monitoring; Female; Humans; Hypertension; Incidence; Logistic Models; Male; Maximum Allowable Concentration; Middle Aged; Nitrogen Dioxide; Odds Ratio; Particulate Matter; Risk Assessment; Seasons; Young Adult

Recombinant human erythropoietin (rHuEPO), used clinically for renal anemia, reportedly exhibits pleiotropic properties in various tissues. To test whether it ameliorates vascular injury, rHuEPO (75U/kg) was administered subcutaneously every 3days for 10days to 5/6 nephrectomized hypertensive rats (5/6Nx) treated with 1% NaCl. rHuEPO had no effect on increased systolic blood pressure or decreased hematocrit values, but normalized levels of proteinuria and creatinine clearance. Vasodilation in response to acetylcholine in the aortic ring was impaired in the 5/6Nx, and improved by treatment with rHuEPO. Immunohistochemical analysis revealed that the infiltration of adventitial areas by macrophages and expression of osteopontin were enhanced in the 5/6Nx aorta and the overexpression was suppressed by rHuEPO. rHuEPO also attenuated medial hyperplasia. Akt signaling was activated by the increased expression of phosphorylated Akt and GSK-3β in aorta from rHuEPO-treated 5/6Nx. rHuEPO restored plasma NOx (NO(2)(-)+NO(3)(-)) levels and endothelial nitric oxide synthase (eNOS) content in the 5/6Nx aorta. Treatment with an eNOS substrate, l-arginine, which caused a similar increase in plasma NOx levels as the rHuEPO treatment, resulted in a normalization of endothelial dysfunction and vascular inflammation. These results suggest that a low dose of rHuEPO exerted vasoprotective effects in rats with hypertensive renal failure.

Topics: Acetylcholine; Animals; Aorta; Aorta, Thoracic; Blood Pressure; Body Weight; Connective Tissue; Dose-Response Relationship, Drug; Endothelium, Vascular; Erythropoietin; Gene Expression Regulation, Enzymologic; Hematocrit; Hematopoiesis; Humans; Hypertension; Macrophages; Male; Nephrectomy; Nitric Oxide; Nitric Oxide Synthase Type III; Nitrogen Dioxide; Nitrogen Oxides; Nitroprusside; Osteopontin; Phosphoproteins; Rats; Rats, Wistar; Recombinant Proteins

A number of epidemiological studies have examined the adverse effect of air pollution on mortality and morbidity. Also, several studies have investigated the associations between air pollution and specific-cause diseases including arrhythmia, myocardial infarction, and heart failure. However, little is known about the relationship between air pollution and the onset of hypertension.. To explore the risk effect of particulate matter air pollution on the emergency hospital visits (EHVs) for hypertension in Beijing, China.. We gathered data on daily EHVs for hypertension, fine particulate matter less than 2.5 microm in aerodynamic diameter (PM(2.5)), particulate matter less than 10 microm in aerodynamic diameter (PM(10)), sulfur dioxide, and nitrogen dioxide in Beijing, China during 2007. A time-stratified case-crossover design with distributed lag model was used to evaluate associations between ambient air pollutants and hypertension. Daily mean temperature and relative humidity were controlled in all models.. There were 1,491 EHVs for hypertension during the study period. In single pollutant models, an increase in 10 microg/m(3) in PM(2.5) and PM(10) was associated with EHVs for hypertension with odds ratios (overall effect of five days) of 1.084 (95% confidence interval (CI): 1.028, 1.139) and 1.060% (95% CI: 1.020, 1.101), respectively.. Elevated levels of ambient particulate matters are associated with an increase in EHVs for hypertension in Beijing, China.

Topics: Air Pollutants; Air Pollution; China; Emergency Service, Hospital; Hospitalization; Humans; Hypertension; Nitrogen Dioxide; Particle Size; Particulate Matter; Sulfur Dioxide

A number of epidemiological studies have been conducted to research the adverse effects of air pollution on mortality and morbidity. Hypertension is the most important risk factor for cardiovascular mortality. However, few previous studies have examined the relationship between gaseous air pollution and morbidity for hypertension.. Daily data on emergency hospital visits (EHVs) for hypertension were collected from the Peking University Third Hospital. Daily data on gaseous air pollutants (sulfur dioxide (SO2) and nitrogen dioxide (NO2)) and particulate matter less than 10 μm in aerodynamic diameter (PM10) were collected from the Beijing Municipal Environmental Monitoring Center. A time-stratified case-crossover design was conducted to evaluate the relationship between urban gaseous air pollution and EHVs for hypertension. Temperature and relative humidity were controlled for.. In the single air pollutant models, a 10 μg/m3 increase in SO2 and NO2 were significantly associated with EHVs for hypertension. The odds ratios (ORs) were 1.037 (95% confidence interval (CI): 1.004-1.071) for SO2 at lag 0 day, and 1.101 (95% CI: 1.038-1.168) for NO2 at lag 3 day. After controlling for PM10, the ORs associated with SO2 and NO2 were 1.025 (95% CI: 0.987-1.065) and 1.114 (95% CI: 1.037-1.195), respectively.. Elevated urban gaseous air pollution was associated with increased EHVs for hypertension in Beijing, China.

Topics: Air Pollutants; Air Pollution; China; Confidence Intervals; Cross-Over Studies; Emergency Service, Hospital; Environmental Monitoring; Epidemiological Monitoring; Humans; Humidity; Hypertension; Nitrogen Dioxide; Odds Ratio; Particulate Matter; Sulfur Dioxide; Temperature; Urban Health

Endogenous nitric oxide plays an important role in modulation of renal hemodynamics and sodium handling, with increased nitric oxide production inducing renal vasodilation and natriuresis. In the normal rat, nitric oxide activity increases as an adaptive response to increased dietary salt intake, perhaps facilitating natriuresis and thus blood pressure homeostasis. We hypothesized that impaired nitric oxide synthetic ability would result in sensitivity to the pressor effects of high dietary salt intake. Four groups of normal Sprague-Dawley rats were observed for eight weeks: Control, 0.4% NaCl chow and tap water; Salt, 4% NaCl chow and tap water; NAME, 0.4% NaCl chow and water containing the nitric oxide synthase inhibitor, L-nitro-arginine-methylester; Salt+NAME, 4% NaCl chow and water containing L-nitro-arginine-methylester. Compared to Controls, Salt rats demonstrated a significant increase in urinary excretion rate of the stable nitric oxide metabolites, NO2 and NO3, and had no increase in blood pressure. Furthermore, Salt rats had no functional or structural evidence of renal injury. In contrast, Salt+NAME rats demonstrated a significantly higher blood pressure than NAME rats, and urinary NO2 and NO3 excretion rate did not increase despite high salt intake. After eight weeks, Salt+NAME rats had significantly impaired renal function and proteinuria. We conclude that adaptive changes in endogenous NO production play a critical role in sodium and blood pressure homeostasis. Furthermore, impaired nitric oxide synthase activity may be a pathogenetic factor in the development of salt-sensitive hypertension.

Topics: Amino Acid Oxidoreductases; Animals; Arginine; Blood Pressure; Hypertension; Kidney Glomerulus; Male; NG-Nitroarginine Methyl Ester; Nitric Oxide; Nitric Oxide Synthase; Nitrites; Nitrogen Dioxide; Proteinuria; Rats; Rats, Sprague-Dawley; Sodium Chloride, Dietary

Topics: Air Pollution; Animals; Arteriosclerosis; Carbon Monoxide; Cardiovascular Diseases; Cardiovascular System; Disease Models, Animal; Dogs; Electrocardiography; Female; Heart Rate; Hemodynamics; Hemoglobins; Hypertension; Methemoglobin; Myocardial Infarction; Nitric Oxide; Nitrogen Dioxide; Sulfoxides; Vectorcardiography; Vehicle Emissions

Topics: Animals; Aortic Coarctation; Arrhythmia, Sinus; Atrial Fibrillation; Blood Flow Velocity; Blood Gas Analysis; Capillaries; Dogs; Heart Function Tests; Heart Septal Defects; Heart Septal Defects, Atrial; Heart Valve Diseases; Hypertension; Mitral Valve Insufficiency; Mitral Valve Stenosis; Nitrogen; Nitrogen Dioxide; Plethysmography; Pulmonary Circulation; Research; Stroke Volume; Vena Cava, Superior