The absence of significant precordial pulsations on visualization can be seen in Ebstein’s syndrome, a congenital heart disease with a very poor prognosis. Genton reported a case that remained asymptomatic at age 79. It is thought that the average age of death for this malformation is 23 to 26 years. In general, the earlier the onset of cyanosis and congestive heart failure, the worse the prognosis; the larger the heart, especially in the short term with progressive enlargement, the worse the prognosis; the more severe the tricuspid valve malformation on cardiovascular imaging, the worse the prognosis (worse in those with stenosis than incomplete closure); and the worse the prognosis in those with severe complications. The main cause of death in this disease is congestive heart failure, and a few patients may die suddenly due to arrhythmias. Death can also occur due to complications such as embolism and infection. What are the examination methods? 1. Physical examination Mild cases may have no cyanosis, while moderate and heavy cases have cyanosis and are prone to supraventricular tachycardia. There are often signs of congestive right heart failure. On physical examination, there is a systolic regurgitant murmur in the tricuspid region, and there may be a third tone heart sound or fourth tone heart rhythm. 2. Electrocardiogram shows right atrial hypertrophy, incomplete or complete right bundle branch block. There are often signs of pre-excitation syndrome. 3.X-ray examination The pulmonary blood is reduced or normal, the heart is spherical or oval enlarged, and the blood vessels are narrow. 4.Echocardiogram The tricuspid valve can be seen to be inferiorly displaced and the degree of inferior displacement. Note the tricuspid regurgitation, the development of the anterior valve, and the presence of atrial defect or oval orifice non-closure. 5, right heart catheterization and imaging The catheter can easily enter the left atrium through atrial defect or unclosed foramen ovale, and the pressure waveform of right atrium is measured in the “atrialized ventricle”, while the pressure waveform of right ventricle is shown in the right heart cavity. The right atrial enlargement, atrialized right ventricle, enlarged functional right ventricular outflow tract, and downwardly displaced tricuspid valve attachment are seen on imaging. 6, electrophysiological examination Diagnosis of tricuspid valve subluxation malformation must be accompanied by clear staging and the presence or absence of preexcitation syndrome. If there is preexcitation syndrome, preoperative electrophysiological examination must be done and intraoperative electrophysiological marker test must be prepared.