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Explanation and Prevention of Birth Defects

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Epidemiology of Human Congenital Malformations
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Abstract

This Chapter gives an overview of the impact of various factors for the risk of a congenital malformation in the offspring of a specific exposed pregnancy and its significance for the total number of malformed infants born in the population. An increased risk for any of the analyzed malformations was found at very low and at high maternal age, a slightly higher risk at parity 1 compared with parity 2-3, at maternal smoking, maternal overweight or obesity, and after a period of unwanted childlessness or previous miscarriage. Pre-existing maternal diabetes was associated with a doubled risk. The individual risk increases were moderate and the impact on the total number of malformed infants born was also relatively small. Some specific maternal diseases (like diabetes type 1) and some specific drugs are associated with a more evident risk increase and patients with such conditions or using such drugs should get pre-pregnancy counselling. The prophylactic use of multivitamins or folic acid may have little effect in a Western well-fare state but probably makes no harm. Genetic counselling is of great importance for families with genetic diseases but the impact on the total number of malformed infants born is limited. The most effective method to reduce the number of infants born with serious malformations is prenatal diagnosis followed by elective abortion in populations where this is acceptable.

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Källén, B. (2014). Explanation and Prevention of Birth Defects. In: Epidemiology of Human Congenital Malformations. Springer, Cham. https://doi.org/10.1007/978-3-319-01472-2_32

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  • DOI: https://doi.org/10.1007/978-3-319-01472-2_32

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