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- W2107600537 abstract "We studied the effect of prenatal maternal cigarette smoking on passive expiratory mechanics in 53 healthy infants tested early in infancy (mean +/- SD, 5.1 +/- 1.5 weeks). Maternal smoking was measured by: 1) questionnaire reports of the number of cigarettes smoked per day; and 2) urine cotinine concentrations (corrected for creatinine) at each visit. Respiratory system mechanics were assessed by the single-breath occlusion-passive-flow-volume maneuver. In ten infants born to smoking mothers the time constant of the respiratory system was 23% reduced [0.34 vs. 0.44 s; 95% confidence interval (CI), -45% + 1%; P = 0.06]. This was related to an estimated 13% decrease in respiratory system compliance (4.86 vs. 5.62 mL/cmH2O; 95%CI, -33% + 6%; P = 0.18) and a 10% reduction in respiratory system resistance (0.073 vs. 0.081 cm H2O/mL/s; 95%CI, -42% + 22%; P = 0.56). Functional residual capacity (FRC), measured by helium-dilution, was also decreased by 13% (78 vs. 90 mL; 95%CI, -27% + 0.3%; P = 0.06) in smoke-exposed infants. Forced expiratory flow rates at FRC obtained by thoraco-abdominal compression were reduced by 28% in infants of smoking mothers (VFRC, 99 vs. 138 mL/s; 95%CI, -54% + 2%; P = 0.04) as reported previously in a larger sample from this population. This study was limited by small numbers of infants exposed to smoking during pregnancy and by ethnic imbalance among the smoking-exposed and unexposed groups.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2107600537 date "1995-01-01" @default.
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- W2107600537 title "Effect of maternal smoking during pregnancy on passive respiratory mechanics in early infancy" @default.
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- W2107600537 doi "https://doi.org/10.1002/ppul.1950190105" @default.
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