▁one ▁at rium ▁and ▁closing ▁the ▁defect ▁with ▁a ▁patch ▁under ▁direct ▁visual ization . ▁ ▁C ath eter ▁procedure ▁ ▁Per cut aneous ▁device ▁closure ▁involves ▁the ▁passage ▁of ▁a ▁c ath eter ▁into ▁the ▁heart ▁through ▁the ▁fem oral ▁ve in ▁gu ided ▁by ▁flu or os copy ▁and ▁e ch oc ardi ography . ▁ ▁An ▁example ▁of ▁a ▁per cut aneous ▁device ▁is ▁a ▁device ▁which ▁has ▁disc s ▁that ▁can ▁expand ▁to ▁a ▁variety ▁of ▁diam eters ▁at ▁the ▁end ▁of ▁the ▁c ath eter . ▁The ▁c ath eter ▁is ▁placed ▁in ▁the ▁right ▁fem oral ▁ve in ▁and ▁gu ided ▁into ▁the ▁right ▁at rium . ▁The ▁c ath eter ▁is ▁gu ided ▁through ▁the ▁at rial ▁sept al ▁wall ▁and ▁one ▁disc ▁( left ▁at rial ) ▁is ▁opened ▁and ▁pulled ▁into ▁place . ▁Once ▁this ▁occurs , ▁the ▁other ▁disc ▁( right ▁at rial ) ▁is ▁opened ▁in ▁place ▁and ▁the ▁device ▁is ▁inserted ▁into ▁the ▁sept al ▁wall . ▁This ▁type ▁of ▁P FO ▁closure ▁is ▁more ▁effective ▁than ▁drug ▁or ▁other ▁medical ▁ther ap ies ▁for ▁decre asing ▁the ▁risk ▁of ▁future ▁th rom bo emb ol ism . ▁The ▁most ▁common ▁ad verse ▁effect ▁of ▁P FO ▁device ▁closure ▁is ▁new - ons et ▁at rial ▁f ibr ill ation . ▁ ▁Other ▁comp lications , ▁all ▁rare , ▁include ▁device ▁migration , ▁er os ion ▁and ▁em bol ization ▁and ▁device ▁th rom b osis ▁or ▁formation ▁of ▁an ▁infl