Eisenmenger's syndrome is defined as obstructive pulmonary vascular disease that develops as a consequence of a large pre-existing left-to-right shunt causing pulmonary artery pressures to increase and approach systemic levels, such that the direction of blood flow then becomes bi-directional or right-to-left.1
This is a companion discussion topic for the original article at https://patient.info/doctor/congenital-disorders/eisenmengers-syndrome