Systemic inflammation, heart rate variability and air pollution in a cohort of senior adults.
OBJECTIVE
Short-term elevation of ambient particulate air pollution has been associated with autonomic dysfunction and increased systemic inflammation, but the interconnections between these pathways are not well understood. We examined the association between inflammation and autonomic dysfunction and effect modification of inflammation on the association between air pollution and heart rate variability (HRV) in elderly subjects.


METHODS
25 elderly subjects in Steubenville, Ohio, were followed up to 24 times with repeated 30-min ECG Holter monitoring (545 observations). C-reactive protein (CRP), fibrinogen, interleukin-6 (IL-6), soluble inter-cellular adhesion molecule 1 (sICAM-1), and white blood cell and platelet counts were measured in peripheral blood samples collected in the first month of the study. Increased systemic inflammation was defined for subjects within the upper 20% of the distribution for each marker. A central ambient monitoring station provided daily fine particle (PM(2.5)) and sulphate (SO(4)(2-)) data. Linear mixed models were used to identify associations between inflammatory markers and HRV and to assess effect modification of the association between air pollution and HRV due to inflammatory status.


RESULTS
A 5.8 mg/l elevation in CRP was associated with decreases of between -8% and -33% for time and frequency domain HRV outcomes. A 5.1 microg/m(3) increase in SO(4)(2-) on the day before the health assessment was associated with a decrease of -6.7% in the SD of normal RR intervals (SDNN) (95% CI -11.8% to -1.3%) in subjects with elevated CRP, but not in subjects with lower CRP (p value interaction=0.04), with similar findings for PM(2.5).


CONCLUSIONS
Increased systemic inflammation is associated with autonomic dysfunction in the elderly. Air pollution effects on reduced SDNN are stronger in subjects with elevated systemic inflammation.
Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, USA. hgibson@hsph.harvard.edu
Heike
H
Luttmann-Gibson
Helen H
HH
Suh
Brent A
BA
Coull
Douglas W
DW
Dockery
Stefanie Ebelt
SE
Sarnat
Joel
J
Schwartz
Peter H
PH
Stone
Diane R
DR
Gold
D000368:Aged; D000369:Aged, 80 and over; D000397:Air Pollution / Q000009:adverse effects* / Q000032:analysis; D001145:Arrhythmias, Cardiac / Q000209:etiology*; D001342:Autonomic Nervous System Diseases / Q000209:etiology; D015415:Biomarkers / Q000097:blood; D002097:C-Reactive Protein / Q000378:metabolism; D015331:Cohort Studies; D004784:Environmental Monitoring / Q000379:methods; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007249:Inflammation / Q000209:etiology*; D018836:Inflammation Mediators / Q000097:blood; D008297:Male; D008875:Middle Aged; D052638:Particulate Matter / Q000032:analysis / Q000633:toxicity
D015415:Biomarkers; D018836:Inflammation Mediators; D052638:Particulate Matter; D002097:C-Reactive Protein