If there is an atrial septal defect, an electrocardiogram as well as an ultrasound of the heart is performed to identify the site and size of the defect. If an atrial septal defect is identified, the procedure is performed by sterilizing a sterile towel sheet and using the left and right femoral veins as puncture points. After successful puncture, a guide wire sheath is inserted deep into the septal defect to release the occluder. After release, the sheath and guidewire are withdrawn. In addition, pressure is applied to the puncture site to stop the bleeding. The patient’s vital signs are monitored by continuous cardiac monitoring in the monitoring room. At the end of the procedure, cardiotonic and diuretic drugs are administered to enable the patient to regain cardiac function as soon as possible.