The Effects of Ambient Air Pollutants on Changes in Cardiac Structure and Function

Area of Science:

• Environmental Health
• Cardiology
• Epidemiology

Background:

• The impact of air pollution on cardiac health before clinical heart failure is not fully understood.
• Investigating preclinical cardiac changes related to air pollutants is crucial for public health.

Purpose of the Study:

• To determine if ambient air pollutant concentrations correlate with longitudinal changes in cardiac structure and function.
• To assess the association between exposure to particulate matter 2.5 (PM2.5) and nitrogen dioxide (NO2) and echocardiographic measures.

Main Methods:

• Serial echocardiograms assessed cardiac structure and function in 1,630 individuals over a median of 4.3 years.
• Residential air pollution levels (PM2.5, NO2) were estimated using spatio-temporal models for the year preceding each visit.
• Longitudinal associations between air pollution and echocardiographic measures were analyzed, adjusting for covariates.

Main Results:

• Higher PM2.5 and NO2 concentrations were associated with increased global longitudinal strain.
• Elevated PM2.5 and NO2 levels correlated with a decreased left atrial volume index.
• PM2.5 exposure was linked to a reduced left ventricular ejection fraction and increased relative wall thickness.

Conclusions:

• Common air pollutant exposures are associated with preclinical, adverse changes in cardiac structure and function.
• Findings highlight the detrimental effects of air pollution on cardiovascular health at a subclinical stage.