BACKGROUND Tidal breathing flow-volume(TBFV)analysis provides important information about lung mechanics in infants.AIM To assess the effects of breastfeeding on the TBFV measurements of infants who recover from acute...BACKGROUND Tidal breathing flow-volume(TBFV)analysis provides important information about lung mechanics in infants.AIM To assess the effects of breastfeeding on the TBFV measurements of infants who recover from acute bronchiolitis.METHODS In this cross-sectional study,TBFV analysis was performed in infants with bronchiolitis prior to hospital discharge.The ratio of time to peak expiratory flow to total expiratory time(tPEF/tE)at baseline and after the administration of 400 mcg salbutamol was evaluated.RESULTS A total of 56 infants(35 boys),aged 7.4±2.8 mo,were included.Of them,12.5%were exposed to tobacco smoke and 41.1%were breastfed less than 2 mo.There were no differences in baseline TBFV measurements between the breastfeeding groups;however,those who breastfed longer than 2 mo had a greater change in tPEF/tE after bronchodilation(12%±10.4%vs 0.9%±7.1%;P<0.001).Moreover,there was a clear dose-response relationship between tPEF/tE reversibility and duration of breastfeeding(P<0.001).In multivariate regression analysis,infants who breastfed less(regression coefficient-0.335,P=0.010)or were exposed to cigarette smoke(regression coefficient 0.353,P=0.007)showed a greater change in tPEF/tE after bronchodilation,independent of sex,prematurity,and family history of asthma or atopy.CONCLUSION Infants who recover from bronchiolitis and have a shorter duration of breastfeeding or are exposed to cigarette smoke,have TBFV measurements indicative of obstructive lung disease.展开更多
文摘BACKGROUND Tidal breathing flow-volume(TBFV)analysis provides important information about lung mechanics in infants.AIM To assess the effects of breastfeeding on the TBFV measurements of infants who recover from acute bronchiolitis.METHODS In this cross-sectional study,TBFV analysis was performed in infants with bronchiolitis prior to hospital discharge.The ratio of time to peak expiratory flow to total expiratory time(tPEF/tE)at baseline and after the administration of 400 mcg salbutamol was evaluated.RESULTS A total of 56 infants(35 boys),aged 7.4±2.8 mo,were included.Of them,12.5%were exposed to tobacco smoke and 41.1%were breastfed less than 2 mo.There were no differences in baseline TBFV measurements between the breastfeeding groups;however,those who breastfed longer than 2 mo had a greater change in tPEF/tE after bronchodilation(12%±10.4%vs 0.9%±7.1%;P<0.001).Moreover,there was a clear dose-response relationship between tPEF/tE reversibility and duration of breastfeeding(P<0.001).In multivariate regression analysis,infants who breastfed less(regression coefficient-0.335,P=0.010)or were exposed to cigarette smoke(regression coefficient 0.353,P=0.007)showed a greater change in tPEF/tE after bronchodilation,independent of sex,prematurity,and family history of asthma or atopy.CONCLUSION Infants who recover from bronchiolitis and have a shorter duration of breastfeeding or are exposed to cigarette smoke,have TBFV measurements indicative of obstructive lung disease.
