<s>[INST] I am Mou.My age 38,height:158cm,weight:58.I have (ASD(OS)mitral valve normal;interatial septum o.s ASD left to right sunt size 3.1CM.I don t have any proplem till now..Dr,may u clear my following question.1) Is it necessary to close ASD(31MM) as Early as possible though do not have any2) Is surgical closer is better then device closer3) Which  type of device is best?4) Is it necessary to take recurring  medicine after device closer [/INST] Dear Mou,It is better to close ASD not to have complications in the future. If the anatomy of your ASD permits to close it with device percutaneously, it is the best way, as the complications are less. The choice of the device depends on many factors and the type of the ASD. There will be no need to take any medications after the procedure.Take care </s>