Patent ductus arteriosus |
PDA. Failure to close of ductus arteriosus. The defect often corrects itself within several months of birth, but may requireinfusion of indomethacin, the placement of "plugs" via catheters, or surgical closure.The flow pattern is similar to the septal defects, except that the shunting occurs outside of the heart.
The left ventricle hasto pump blood out through the aorta, only to have some of it flow to the lower pressure pulmonary artery, and directly bachto the left atrium and ventricle. If a large PDA is not corrected, then the pressures in the pulmonary arteries may becomevery high and induce changes in the arteries themselves such that even closure of the defect will no longer improve thepatient.
In this case, the pressures in the right side of the heart are high enough that blood may begin to flow from the righto the left side of the heart, causing Eisenmenger's syndrome..
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