Possible mechanisms for spontaneous closure
MR, left atrial pressures
TRICUSPID REGURGITATION
Two studies linked the presence of an iASD to higher left atrial pressures due to higher MR or to the presence of tricuspid regurgitation [Procedure time, device time and catheter manipulation at the atrial septum were presented as the main factors for an iASD in two studies. [In line with published results, no correlation between shunt volume, iASD diameter or size and persistence could be observed in the current cohort [