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A member asked:
How have congenital anatomical variances such as 3 pulmonary veins, bicuspid valves come about? is it an evelutionary error?
5 doctors weighed in across 3 answers
No: Congenital heart disease of all types is uncommon and has multiple causes, many of which are not fully understood. The development of the heart is very complex process that is usually complete by the 12th week of pregnancy. Ultimately all defects result from a problem during that developmental process.
Answered 9/18/2013
5.5k views
Unlikely: Most of 'congenital anatomical variances' are random occurrences.
Answered 11/21/2012
5.5k views
Embryology: It is not an evolutionary error per se. Most heart defects are spontaneous, that is, they are not due to a direct genetic defect but due to multiple issues that dysregulate the fetuses development in the womb.
Answered 1/5/2015
4.9k views
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