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Effects of Particle Size Fractions on Reducing Heart Rate Variability in Cardiac and Hypertensive Patients

By Chuang, Kai-Jen

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Book Id: WPLBN0000000384
Format Type: PDF eBook
File Size: 0.2 MB
Reproduction Date: 2005
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Title: Effects of Particle Size Fractions on Reducing Heart Rate Variability in Cardiac and Hypertensive Patients  
Author: Chuang, Kai-Jen
Volume:
Language: English
Subject: Government publications, United Nations., United Nations. Office for Disarmament Affairs
Collections: Government Library Collection, Disarmament Documents
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Publisher: United Nations- Office for Disarmament Affairs (Unoda)

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Chuang, K. J. (n.d.). Effects of Particle Size Fractions on Reducing Heart Rate Variability in Cardiac and Hypertensive Patients. Retrieved from http://netlibrary.net/


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Government Reference Publication

Excerpt
Excerpt: It is still unknown whether the associations between particulate matter (PM) and heart rate variability (HRV) differ by particle sizes with aerodynamic diameters between 0.3 micrometer and 1.0 micrometer (PM0.3?1.0), between 1.0 micrometer and 2.5 micrometer (PM1.0?2.5), and between 2.5 micrometer and 10 micrometer (PM2.5?10). We measured electrocardiographics and PM exposures in 10 patients with coronary heart disease and 16 patients with either prehypertension or hypertension. The outcome variables were standard deviation of all normal-to-normal (NN) intervals (SDNN), the square root of the mean of the sum of the squares of differences between adjacent NN intervals (r-MSSD), low frequency (LF; 0.04?0.15 Hz), high frequency (HF; 0.15?0.40 Hz), and LF:HF ratio for HRV. The pollution variables were mass concentrations of PM0.3?1.0, PM1.0?2.5, and PM2.5?10. We used linear mixed-effects models to examine the association between PM exposures and log10-transformed HRV indices, adjusting for key personal and environmental attributes. We found that PM0.3?1.0 exposures at 1- to 4-hr moving averages were associated with SDNN and r-MSSD in both cardiac and hypertensive patients. For an interquartile increase in PM0.3?1.0, there were 1.49?4.88% decreases in SDNN and 2.73?8.25% decreases in r-MSSD. PM0.3?1.0 exposures were also associated with decreases in LF and HF for hypertensive patients at 1- to 3-hr moving averages except for cardiac patients at moving averages of 2 or 3 hr. By contrast, we found that HRV was not associated with either PM1.0?2.5 or PM2.5?10. HRV reduction in susceptible population was associated with PM0.3?1.0 but was not associated with either PM1.0?2.5 or PM2.5?10. Key words: air pollution, autonomic system, epidemiology, heart rate variability, particulate matter.

 

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