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Overt and Latent Cardiac Effects of Ozone Inhalation in Rats: Evidence for Autonomic Modulation and Increased Myocardial Vulnerability

FARRAJ, Aimen K ; HAZARI, Mehdi S ; COSTA, Daniel L ; WINSETT, Darrell W ; KULUKULUALANI, Anthony ; CARLL, Alex P ; HAYKAL-COATES, Najwa ; LAMB, Christina M ; LAPPI, Edwin ; TERRELL, Dock ; CASCIO, Wayne E

Environmental health perspectives, 2012-03, Vol.120 (3), p.348-354 [Periódico revisado por pares]

Research Triangle Park, NC: US Department of Health and Human Services

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Título:
Overt and Latent Cardiac Effects of Ozone Inhalation in Rats: Evidence for Autonomic Modulation and Increased Myocardial Vulnerability
Autor: FARRAJ, Aimen K ; HAZARI, Mehdi S ; COSTA, Daniel L ; WINSETT, Darrell W ; KULUKULUALANI, Anthony ; CARLL, Alex P ; HAYKAL-COATES, Najwa ; LAMB, Christina M ; LAPPI, Edwin ; TERRELL, Dock ; CASCIO, Wayne E
Assuntos: Aconitine - toxicity ; Air ; Animals ; Arrhythmia ; Arrhythmias, Cardiac - chemically induced ; Arrhythmias, Cardiac - physiopathology ; Autonomic Agents - toxicity ; Biological and medical sciences ; Cardiac dysrhythmias ; Cardiology. Vascular system ; Cohort Studies ; Dose-Response Relationship, Drug ; Electrocardiogram ; Electrocardiography ; Electrophysiology ; Environment. Living conditions ; Environmental aspects ; Environmental pollutants toxicology ; Health ; Health aspects ; Heart ; Heart - drug effects ; Heart - physiopathology ; Heart diseases ; Heart Rate ; Inhalation ; Inhalation Exposure ; Male ; Medical sciences ; Modulation ; Oxidants, Photochemical - toxicity ; Ozone ; Ozone - toxicity ; Public health. Hygiene ; Public health. Hygiene-occupational medicine ; Rats ; Rats, Inbred SHR ; Risk factors ; Telemetry ; Toxicology
É parte de: Environmental health perspectives, 2012-03, Vol.120 (3), p.348-354
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SourceType-Scholarly Journals-1
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Descrição: Ozone (O₃) is a well-documented respiratory oxidant, but increasing epidemiological evidence points to extrapulmonary effects, including positive associations between ambient O₃ concentrations and cardiovascular morbidity and mortality. With preliminary reports linking O₃ exposure with changes in heart rate (HR), we investigated the hypothesis that a single inhalation exposure to O₃ will cause concentration-dependent autonomic modulation of cardiac function in rats. Rats implanted with telemeters to monitor HR and cardiac electrophysiology [electrocardiography (ECG)] were exposed once by whole-body inhalation for 4 hr to 0.2 or 0.8 ppm O₃ or filtered air. A separate cohort was tested for vulnerability to aconitine-induced arrhythmia 24 hr after exposure. Exposure to 0.8 ppm O₃ caused bradycardia, PR prolongation, ST depression, and substantial increases in atrial premature beats, sinoatrial block, and atrioventricular block, accompanied by concurrent increases in several HR variability parameters that were suggestive of increased parasympathetic tone. Low-O₃ exposure failed to elicit any overt changes in autonomic tone, heart rhythm, or ECG. However, both 0.2 and 0.8 ppm O₃ increased sensitivity to aconitine-induced arrhythmia formation, suggesting a latent O₃-induced alteration in myocardial excitability. O₃ exposure causes several alterations in cardiac electrophysiology that are likely mediated by modulation of autonomic input to the heart. Moreover, exposure to low O₃ concentrations may cause subclinical effects that manifest only when triggered by a stressor, suggesting that the adverse health effects of ambient levels of air pollutants may be insidious and potentially underestimated.
Editor: Research Triangle Park, NC: US Department of Health and Human Services
Idioma: Inglês

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Overt and Latent Cardiac Effects of Ozone Inhalation in Rats: Evidence for Autonomic Modulation and Increased Myocardial Vulnerability

FARRAJ, Aimen K ; HAZARI, Mehdi S ; COSTA, Daniel L ; WINSETT, Darrell W ; KULUKULUALANI, Anthony ; CARLL, Alex P ; HAYKAL-COATES, Najwa ; LAMB, Christina M ; LAPPI, Edwin ; TERRELL, Dock ; CASCIO, Wayne E

Research Triangle Park, NC: US Department of Health and Human Services

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