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Cotinine excretion as a predictor of peak flow variability
J Kuehr1, T Frischer, W Karmaus
1University Children's Hospital, Freiburg, Germany; University Children's Hospital, Vienna, Austria.
Summary
Environmental tobacco smoke (ETS) exposure increases bronchial hyperresponsiveness in children, particularly boys. Urine cotinine levels correlated with airway responsiveness, highlighting the need for passive smoking prevention strategies.
Area of Science:
- Environmental Health
- Pediatric Pulmonology
- Toxicology
Background:
- Environmental tobacco smoke (ETS) is a suspected risk factor for bronchial hyperresponsiveness in children.
- Passive smoking can lead to significant respiratory issues in early life.
Purpose of the Study:
- To investigate the association between ETS exposure and bronchial hyperresponsiveness in children.
- To analyze gender-specific effects of ETS on airway responsiveness.
Main Methods:
- Measured expiratory flow rates and urine cotinine excretion (UCE) in children over two years.
- Calculated the amplitude over the mean (AVAM) ratio of diurnal peak flow rates as an indicator of bronchial responsiveness.
- Utilized multiple linear regression to analyze the association between UCE and log10AVAM.
Main Results:
- Children of smoking parents had significantly higher UCE than those of non-smoking parents.
- Increased UCE was associated with higher bronchial responsiveness (log10AVAM) in children.
- This association was significant in boys but not in girls.
Conclusions:
- ETS exposure is linked to increased bronchial hyperresponsiveness in children.
- A significant gender difference exists in the association between ETS and airway responsiveness.
- Further research and stronger passive smoking prevention strategies are needed for children.