Prenatal exposure to perfluoralkyl substances (PFASs) associated with respiratory tract infections but not allergy- and asthma-related health outcomes in childhood.

BACKGROUND: Prenatal exposure to perfluoralkyl substances (PFASs) has been reported to be associated with immunosuppression in early childhood, but with contradictory findings related to atopic and lung diseases. AIM: We aimed to determine if prenatal exposure to PFASs is associated with asthma or other allergic diseases or respiratory tract infections in childhood. METHODS: Nineteen PFASs were measured in cord blood available from 641 infants in the Environment and Childhood Asthma (ECA) prospective birth cohort study. The six most abundant PFASs were perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonamide (PFOSA), perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), and perfluoroundecanoic acid (PFUnDA). Health outcomes were assessed at two and ten years of age, and included reported obstructive airways disease (wheeze by 10 years; asthma by 2 and 10 years; reduced lung function at birth; allergic rhinitis by 10 years), atopic dermatitis (AD) by 2 and 10 years, allergic sensitization by 10 years, and episodes of common respiratory tract infections (common cold by 2 years, lower respiratory tract infections (LRTI) by 10 years). The associations between exposure and health outcomes were examined using logistic and Poisson regression. RESULTS: The number of reported airways infections were significantly associated with cord blood concentrations of PFAS; common colds by two years with PFUnDA (ß = 0.11 (0.08-0.14)) and LRTIs from 0 to 10 years of age with PFOS (ß = 0.50 (0.42-0.57)), PFOA (ß = 0.28 (0.22-0.35)), PFOSA (ß = 0.10 (0.06-0.14)), PFNA (ß = 0.09 (0.03-0.14)) and PFUnDA (ß = 0.18 (0.13-0.23)) concentrations. Neither reduced lung function at birth, asthma, allergic rhinitis, AD nor allergic sensitization were significantly associated with any of the PFASs. CONCLUSION: Although prenatal exposure to PFASs was not associated with atopic or lung manifestations by 10 years of age, several PFASs were associated with an increased number of respiratory tract infections in the first 10 years of life, suggesting immunosuppressive effects of PFASs.

Maternal levels of perfluoroalkyl substances (PFASs) during pregnancy and childhood allergy and asthma related outcomes and infections in the Norwegian Mother and Child (MoBa) cohort.

INTRODUCTION: Prenatal exposure to perfluoroalkyl substances (PFASs) has been inconsistently associated with asthma and allergic diseases and increased number of infections in early childhood. We examined the association of PFASs measured in pregnancy with childhood asthma, allergies and common infectious diseases in a prospective pregnancy cohort followed to age 7 years. MATERIAL AND METHODS: Six PFASs (out of 19 measured) with at least 80% of measurements above the limit of quantification (LOQ) in maternal plasma during pregnancy in two subcohorts of the Norwegian Mother and Child Cohort Study (MoBa) were analyzed in relation to health outcomes: perfluorooctane sulfonic acid (PFOS), acid (PFOA), perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), perfluoroundecanoic acid (PFUnDA), and perfluoroheptane sulfonic acid (PFHpS). Follow-up questionnaires were completed at 3 years by 1270 women and at 7 years by 972 women among the 1943 with pregnancy questionnaire and PFAS measures. Health outcomes included parent reports of child's symptoms or doctor diagnosed asthma and allergic conditions at age 7 years and parent-reported frequency of various infections at 3 and 7 years of age. Logistic and Poisson regression were used. The false discovery rate was controlled at 5%. Sensitivity analyses on gender were performed. RESULTS: Among the allergy and asthma outcomes, a statistically significant inverse association was seen between PFUnDA concentrations and ever having atopic eczema in girls. PFUnDA also tended to be inversely associated with both wheeze and asthma. For infections from 0 to 3 and 6 to 7 years, 11 significant positive associations were seen between PFASs and airways infections (bronchitis/pneumonia, throat infection, pseudocroup), ear infection and gastric flu/diarrhea; whereas 6 inverse associations were seen for pseudocroup, ear infections and urinary tract infections. The majority of the findings with respect to infectious diseases were found in girls only. DISCUSSION: With the exception of an inverse association between PFUnDA and eczema, and a tendency of a similar association for wheeze and asthma, maternal PFAS levels during pregnancy showed little association with asthma or allergy related outcomes. Findings from the present study suggest immunosuppressive effects of PFASs on airways infections, such as bronchitis/pneumonia and throat infections, as well as diarrhea/gastric flu. Our results indicate a possible role of gender in the PFAS-health outcome associations.

In-hospital treated pediatric injuries are increasing in Finland--a population based study between 1997 and 2006.

BACKGROUND AND AIMS: Injuries are an important public health problem as well as the leading cause of death and disability among children. Our aim was to longitudinally explore the incidence of in-hospital treated traumas, their operative treatment and related mortality among pediatric patients in Finland. METHODS: The National Hospital Discharge Register and the Official Cause-of-Death Statistics data of in-hospital treated pediatric trauma patients between 1997 and 2006 in Finland were evaluated for hospitalizations, treatment modality and mortality. RESULTS: Fractures (69%) and head injuries (28%) were the most common in-hospital treated traumas (477/100,000 persons/year). These were followed by injuries of intra-abdominal (1.4%), thoracic (1.2%) and urological organs (0.6%). Head traumas constituted 67% of injury-related deaths. During the ten-year follow-up period, the annual incidence (per 100,000 persons) of head injuries decreased by 13.6% (152 in 1997 vs. 131 in 2006, p < 0.0001) mainly contributing to a 30% decrease in overall injury-related mortality incidence (from 5.7 in 1997 to 4.0 in 2006, p = 0.0519). The overall trauma incidence, and incidence of fractures and abdominal injuries significantly increased by 5.0% (p < 0.0001), 13.5% (p < 0.0001) and 37% (p < 0.05), respectively, while the incidence of thoracic and urological injuries remained unchanged. Up to 15% of spleen injuries lead to splenectomy. CONCLUSIONS: Although overall and head trauma-related mortality is decreasing, the increasing incidence of fractures and abdominal injuries has amplified the overall incidence of severe injuries among children in Finland. A significant number of unnecessary splenectomies are still performed among children.