A blocker is a surgical or interventional procedure to implant a blocker in a certain part of the heart, such as a ventricular septal defect, an atrial septal defect, an unclosed arterial duct, or a left-ear block due to anomalous beats. The blocker will not fall off after implantation by scientific means, so there is no need to be too nervous and worried. If the blocker is dislodged, the original symptoms of the disease will reappear, such as heart rate, atrial fibrillation, congenital heart disease symptoms, this blocker dislodged is equivalent to a foreign body, will stimulate the atrial wall, interventricular wall, atrial fibrillation, ventricular fibrillation, ventricular premature arrhythmia, etc., dislodged in the valve will appear valve stenosis. The heart ejection is affected, not only affects the reflux to appear lower limb edema and other symptoms, but also affects the ejection to appear ischemia, hypoxia, syncope and other symptoms, and may also appear heart failure and other adverse events.