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Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels
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Cotinine in meconium indicates risk for early respiratory tract infections

T G Nuesslein1, D Beckers, C H Rieger

  • 1Children's Hospital of the Ruhr-University, Bochum, Germany.

Human & Experimental Toxicology
|May 20, 1999
PubMed

Insights

Prenatal tobacco exposure, measured by cotinine in newborn meconium, significantly increases infant risk for lower respiratory tract infections. This biomarker is a more reliable predictor than self-reported exposure history.

Area of Science:

  • Pediatrics
  • Environmental Health
  • Respiratory Medicine

Background:

  • Lower respiratory tract infections (LRTIs) are a significant cause of infant morbidity.
  • Identifying reliable predictors of infant LRTIs is crucial for early intervention.
  • Prenatal exposure to environmental toxins, such as tobacco smoke, is a suspected risk factor.

Purpose of the Study:

  • To investigate the association between prenatal tobacco smoke exposure and the risk of LRTIs in early infancy.
  • To evaluate cotinine concentration in meconium as a biomarker for prenatal tobacco exposure.
  • To compare the predictive value of meconium cotinine with other potential risk factors for infant respiratory symptoms.

Main Methods:

  • Meconium cotinine levels were measured in 91 newborns to assess prenatal tobacco exposure.
  • Parental questionnaires were administered at birth to gather demographic and environmental data.
  • Infants were followed for the first year of life with monthly telephone interviews to record respiratory symptoms.

Main Results:

  • High meconium cotinine concentration (above median) was significantly associated with an increased risk of LRTIs in the first 6 months of life (odds ratio 4.9).
  • Meconium cotinine levels correctly predicted LRTIs in 77% of infants when exceeding the median.
  • Self-reported tobacco consumption, parental atopy history, maternal age, siblings, socio-economic status, gestational age, birth weight, gender, and breastfeeding duration were not independent risk factors.

Conclusions:

  • Meconium cotinine concentration is a valuable and preferred objective measure of prenatal tobacco smoke exposure.
  • Quantifying meconium cotinine provides a more accurate estimate of early respiratory tract infection risk than historical or self-reported data.
  • This objective biomarker can aid in identifying infants at higher risk for respiratory issues in early life.

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