How can a congenital heart disease cause congestive heart failure?

Flow demands. The fetal heart is required to do about half the work of living outside. Blood from the body is pumped through the heart back to the body & placenta without going through the lungs. Mom also does the work of providing nutrients, removing waste & keeping temperature stable. After birth, the heart must pump thru the lungs & do more work. The additional load can lead the heart to fail.

Related Questions

How often do? Congenital heart disease present as? Heart failure?

Rarely in utero. Even severe fetal cardiac defects rarely cause fetal hydrops or heart failure. On the other hand, many severe defects can present as florid cardiac failure in the nursery or the first few days/weeks of life and prompt expert care is mandatory. See: http://texaschildrens.Org/locate/doctors/ayres, -nancy/. Read more...
Rare. A congenital defect to 'present' for the first time as heart failure, would likely be in the very young infant. Undiagnosed congenital disease which presents in this way, previously unknown, is quite rare. Read more...

What are the causes of congenital heart disease?

Multiple. Congenital heart defects are a collection of issues that could be devastating early or of almost no consequence even in the long. As there are a variety of maladies, the causes are multiple as well. Environmental factors, genetic abnormalities in either of the parents and a combination of these factors lead to congenital heart defects. Read more...
?????? The most common cause is that we have no direct cause for congenital heart defects. They can be associated with certain genetic conditions such as down's syndrome. I also think in my distant memory that there are some that can be drug/chemically induced. Read more...