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Adverse circulatory effects of passive smoking during infancy: surprisingly strong, manifest early, easily avoided
G Cohen1, C Vardavas, E Patelarou
1Department of Women's and Children's Health, Karolinska Institute, Stockholm, Sweden.
Insights
Infants exposed to secondhand smoke show significantly altered blood pressure reactions (BPR) to stress. Reducing infant smoke exposure can prevent these adverse cardiovascular effects.
Area of Science:
- Cardiovascular physiology
- Pediatric health
- Environmental health
Background:
- Prenatal and early infancy exposure to tobacco smoke is a public health concern.
- Understanding the cardiovascular impact of passive smoke exposure on infants is crucial.
Purpose of the Study:
- To investigate the association between passive tobacco smoke exposure and blood pressure reactions (BPR) in infants.
- To assess cardiovascular effects in infants exposed to environmental tobacco smoke.
Main Methods:
- Observational field study comparing 4- to 6-month-old infants.
- Groups included lifelong nonsmokers, passive smokers, and infants of active smokers.
- Biochemical verification of smoke exposure (urine cotinine) and beat-to-beat blood pressure (BP) monitoring during stress maneuvers.
Main Results:
- A significant difference in BPR was observed between control infants and passive smokers.
- Infant BPR declined linearly with increasing infant cotinine levels, suggesting postnatal exposure is a key factor.
- Infants of active smokers exhibited different BPR compared to passive smokers.
Conclusions:
- Cardiovascular effects of passive smoking in newborns are pronounced and appear early.
- Adverse effects can be mitigated by maintaining a smoke-free environment for infants.
- Early intervention to reduce infant smoke exposure is vital for cardiovascular health.
Aim:
To compare blood pressure reactions (BPR) of infants to mild stress for evidence of adverse cardiovascular effects of passive exposure to tobacco smoke during pregnancy and early infancy.
Methods:
An observational field study conducted in Crete. We compared 4- to 6-month olds of lifelong nonsmokers minimally (controls, n = 9) or frequently exposed to tobacco smoke (passive smokers; n = 10) with those born to habitual smokers (n = 6). Smoke exposure was verified biochemically (urine cotinine each trimester and at study). We recorded beat-to-beat blood pressure (BP) during brief repositioning manoeuvres performed during a daytime nap and analysed BPR (% change in BP during head-up tilt) for associations with maternal and infant cotinine.
Results:
We observed a 20-fold difference between BPR of infants of controls versus passive smokers - exceptional given number of infants (α error/confidence level <10% i.e. power >90%). The BPR declined linearly as the infant's (but not mother's) cotinine level rose (p = 0.04), indicating abnormal BPR was caused mainly by postnatal smoke exposure. Infants of active smokers differed from those of passive smokers.
Conclusion:
Cardiovascular effects of passive smoking by a newborn infant manifest early on and are exceptionally strong. They can be largely avoided by keeping the home smoke rigorously free.
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