Effects of concentrated ambient particles on heart rate, blood pressure, and cardiac contractility in spontaneously hypertensive rats

Chuen-Chau Chang, Jing Shiang Hwang, Chang Chuan Chan, Peng Y. Wang, Tsuey H. Hu, Tsun J. Cheng

Research output: Contribution to journalArticle

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Abstract

Epidemiological studies have shown that particulate matter (PM) air pollution is associated with cardiovascular mortality and morbidity, especially for particles with aerodynamic diameters under 2.5 μm (PM2.5). Recent studies have revealed an association between PM pollution and autonomic functions including heart rate (HR), blood pressure (BP), and heart-rate variability. However, the association and linking mechanisms have not been clearly demonstrated in animal studies. Utilizing a novel approach that employs a mixed-effects model to overcome the problems of variations in diseased animals and circadian cycles, we have previously demonstrated an association between concentrated PM2.5 and changes of HR and BP in pulmonary hypertensive rats. The objective of this study is to test the plausibility of this methodology and to demonstrate the particle effects under different pathophysiology. The feasibility of cardiac contractility (measured as QA interval, QAI) as an indicator for PM toxicology was also explored. Four spontaneously hypertensive (SH) rats were repeatedly exposed to concentrated PM2.5 during spring and summer. The mass concentration of particles during the 5 h of exposure was 202.0 ± 68.8 (mean ± SE) and 141.0 ± 54.9 μg/m3 for spring and summer experiments, respectively. During spring exposures, the maximum increase of HR and mean BP noted at the end of exposure were 51.6 bpm (p <.001) and 8.7 mm Hg (p = .002), respectively. The maximum decrease of QAI noted at the same time was 1.6 ms (p = .001). Though a similar pattern was demonstrated during summer exposures, the responses were less prominent. We conclude that concentrated PM2.5 may increase HR and mean BP and decrease QAI in SH rats. Our results also show that QAI may be used as an indicator in PM toxicology.

Original languageEnglish
Pages (from-to)421-429
Number of pages9
JournalInhalation Toxicology
Volume16
Issue number6-7
DOIs
Publication statusPublished - Jun 2004
Externally publishedYes

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Blood pressure
Inbred SHR Rats
Particulate Matter
Rats
Heart Rate
Blood Pressure
Toxicology
Animals
Animal Diseases
Air Pollution
Air pollution
Epidemiologic Studies
Aerodynamics
Pollution
Morbidity
Lung
Mortality
Experiments

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Toxicology

Cite this

Effects of concentrated ambient particles on heart rate, blood pressure, and cardiac contractility in spontaneously hypertensive rats. / Chang, Chuen-Chau; Hwang, Jing Shiang; Chan, Chang Chuan; Wang, Peng Y.; Hu, Tsuey H.; Cheng, Tsun J.

In: Inhalation Toxicology, Vol. 16, No. 6-7, 06.2004, p. 421-429.

Research output: Contribution to journalArticle

Chang, Chuen-Chau ; Hwang, Jing Shiang ; Chan, Chang Chuan ; Wang, Peng Y. ; Hu, Tsuey H. ; Cheng, Tsun J. / Effects of concentrated ambient particles on heart rate, blood pressure, and cardiac contractility in spontaneously hypertensive rats. In: Inhalation Toxicology. 2004 ; Vol. 16, No. 6-7. pp. 421-429.
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