摘要
Emergencies of epistaxis in students caused by environmental pollution have rarely been reported to date. This study aimed to explore the cause of an emergency of epistaxis in elementary students by using a field epidemiological investigation. Twenty-two epistaxis cases from a single school with differences in gender, age, and classroom,were diagnosed within a period of 7 days. The air concentration of chromic acid mist （Cr6~） in the electroplating factory area, new campus, and residential area exceeded the limit of uncontrolled emissions. The emission of HCL and HzSO4was also observed. Formaldehyde levels in the classrooms exceeded the limits of indoor air quality. Abnormal nasal mucosa was significantly more frequent in the case group （93.3%） and control group 1 （of the same school） （66.7%） than in control group 2 （from a mountainous area with no industrial zone） （34.8%; P 〈 0.05 and P 〈 0.01, respectively）. On the basis of the pre-existing local nasal mucosal lesions, excessive chromic acid mist in the school＇s surrounding areas and formaldehyde in the classrooms were considered to have acutely irritated the nasal mucosa, causing epistaxis. Several lessons regarding factory site selection, eradication of chemical emissions, and indoor air quality in newly decorated classrooms, should be learned from this emergency.
Emergencies of epistaxis in students caused by environmental pollution have rarely been reported to date. This study aimed to explore the cause of an emergency of epistaxis in elementary students by using a field epidemiological investigation. Twenty-two epistaxis cases from a single school with differences in gender, age, and classroom,were diagnosed within a period of 7 days. The air concentration of chromic acid mist （Cr6~） in the electroplating factory area, new campus, and residential area exceeded the limit of uncontrolled emissions. The emission of HCL and HzSO4was also observed. Formaldehyde levels in the classrooms exceeded the limits of indoor air quality. Abnormal nasal mucosa was significantly more frequent in the case group （93.3%） and control group 1 （of the same school） （66.7%） than in control group 2 （from a mountainous area with no industrial zone） （34.8%; P 〈 0.05 and P 〈 0.01, respectively）. On the basis of the pre-existing local nasal mucosal lesions, excessive chromic acid mist in the school＇s surrounding areas and formaldehyde in the classrooms were considered to have acutely irritated the nasal mucosa, causing epistaxis. Several lessons regarding factory site selection, eradication of chemical emissions, and indoor air quality in newly decorated classrooms, should be learned from this emergency.
基金
sponsored by Zhejiang Provincial Program for the Cultivation of High-Level Innovative Health Talents
in part supported by the Natural Science Foundation of China(81472961)
the Co-constructed Projects by the National Health and Family Planning Commission of China,and the Health Bureau of Zhejiang Province(No.WSK2014-2-004)
