Related Experiment Videos
Middle-ear disease in children exposed prenatally to polychlorinated biphenyls and polychlorinated dibenzofurans
1Department of Otolaryngology, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China.
Insights
Children exposed to rice oil contaminated with polychlorinated biphenyls (PCBs) and polychlorinated dibenzofurans (PCDFs) showed a higher incidence of middle-ear diseases. This study highlights the long-term health effects of PCB and PCDF exposure in children.
Area of Science:
- Environmental Health
- Pediatrics
- Toxicology
Background:
- A 1978-1979 rice oil contamination incident in Taiwan exposed pregnant women and children to polychlorinated biphenyls (PCBs) and polychlorinated dibenzofurans (PCDFs).
- Maternal consumption of contaminated rice oil before birth led to fetal exposure.
- Long-term health impacts of such environmental exposures on children's development require investigation.
Purpose of the Study:
- To investigate the association between prenatal exposure to PCBs and PCDFs and the prevalence of middle-ear diseases in children.
- To compare middle-ear health outcomes in children exposed to contaminated rice oil versus unexposed controls.
Main Methods:
- A cohort of children born between June 1978 and March 1985 in Taiwan were followed up.
- Exposed children (whose mothers consumed contaminated rice oil) were matched with unexposed controls.
- Otolaryngological examinations using pneumatic otoscopy and tympanometry were conducted in 1993.
- Serum levels of specific PCBs and PCDFs were measured in children with and without ear diseases.
Main Results:
- Children prenatally exposed to PCBs and PCDFs exhibited a significantly higher prevalence of middle-ear diseases compared to matched controls.
- Elevated serum levels of 2,3,4,7,8-pentachlorodibenzofuran and 1,2,3,4,7,8-hexachlorodibenzofuran were found in exposed children with ear diseases.
- A dose-response relationship between contaminant levels and disease incidence is suggested.
Conclusions:
- Prenatal exposure to PCBs and PCDFs is linked to an increased incidence of middle-ear diseases in children.
- These findings underscore the potential for persistent environmental toxins to cause long-term pediatric health issues.
- Further research is warranted to elucidate the specific mechanisms of PCB and PCDF-induced ototoxicity.
Abstract:
During 1978 and 1979, an episode of poisoning from ingestion of rice oil contaminated with polychlorinated biphenyls and polychlorinated dibenzofurans occurred in central Taiwan. We followed-up children who had been born between June 1978 and March 1985, as well as matched unexposed children. The mothers of exposed children had consumed contaminated oils before the children were born. In 1993, otolaryngologists examined the middle ear of each child with a pneumatic otoscope, and they measured the middle-ear pressure by tympanometry with a Rion RS20 impedance audiometer. The exposed children had a significantly higher prevalence of middle-ear diseases than their matched controls. The exposed children who had ear diseases had higher serum levels of 2,3,4,7,8-pentachloro- and 1,2,3,4,7,8-hexachloro-dibenzofurans than the children who did not have similar diseases. Therefore, in this study, children exposed to polychlorinated biphenyls and polychlorinated dibenzofurans had a higher incidence of middle-ear diseases than their controls.