OBJECTIVETo analyze the risk factors of congenital heart defects (CHD) in fetal and infants born from 2004 to 2011 in Guangdong province.

METHODSBabies with CHD aged from 28th week of gestation to 1 year old postnatal from July 1 2004 to December 31 2011 were registered in Guangdong CHD monitoring network with 34 participating units. Totally 2568 CHD cases were included, and 1: 1 matched with a normal control cohort by gender, living district and birth date (time span within 3 months).Exposed information of mother and father at pre-pregnancy and early pregnancy was collected. Post collinearity diagnostics analysis, univariate analysis results were included in a multivariate analysis model with forward stepwise conditional logistic regression.

RESULTSMultivariate conditional logistic regression analysis showed that high risk factors for CHD included low birth weight infant (OR = 5.34, P < 0.01), macrosomia (OR = 1.67, P < 0.05), low per capita income (0-1200 yuan, OR = 1.68, P < 0.01), exposure to chemical agent at early pregnancy (OR = 19.72, P < 0.01), floating population (OR = 2.13, P < 0.01), abnormal reproductive history (OR = 3.18, P < 0.01), exposure to passive smoking (OR = 2.59, P < 0.01), suffering from fever (OR = 3.74, P < 0.01), equal to or more than twice parity (OR = 1.45, P < 0.01), living in a newly (within six months)-decorated-apartment (OR = 2.74, P < 0.01), suffering from virus infection (OR = 2.08, P < 0.01), rural residence (OR = 1.33, P < 0.01), living in an apartment within 50 meters of major traffic road (OR = 1.52, P < 0.01), syphilis infection at early pregnancy (OR = 13.06, P < 0.05) and father's drinking habit at pre-pregnancy (OR = 1.57, P < 0.05).

CONCLUSIONNumerous risk factors for CHD in fetal and infants of Guangdong province are indicated by our results, comprehensive intervention should be considered in pre-pregnancy and early pregnancy to reduce the risk of CHD.