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Eisenmenger’s syndrome (or Eisenmenger’s reaction) is defined as the process in which a left-to-right shunt caused by a ventricular septal defect in the heart causes increased flow through the pulmonary vasculature, causing pulmonary hypertension,[1] which in turn, causes increased pressures in the right side of the heart and reversal of the shunt into a right-to-left shunt.
It can cause serious complications in pregnancy,[2] though successful delivery has been reported.[3]
Conditions needed for a person to be diagnosed with Eisenmenger’s Syndrome are:
Eisenmenger’s syndrome was so named[4] by Dr. Paul Wood after Dr. Victor Eisenmenger, who first described[5] the condition in 1897.[6]
A number of congenital heart defects can cause Eisenmenger’s syndrome, including atrial septal defects, ventricular septal defects, patent ductus arteriosus, and more complex types of acyanotic heart disease.
The left side of the heart supplies blood to the whole body, and as a result has higher pressures than the right side, which supplies only deoxygenated blood to the lungs. If a large anatomic defect exists between the sides of the heart, blood will flow from the left side to the right side. This results in high blood flow and pressure travelling through the lungs. The increased pressure causes damage to delicate capillaries, which then are replaced with scar tissue. Scar tissue does not contribute to oxygen transfer, therefore decreasing the useful volume of the pulmonary vasculature. The scar tissue also provides less flexibility than normal lung tissue, causing further increases in blood pressure, and the heart must pump harder to continue supplying the lungs, leading to damage of more capillaries.
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