Narrow diaphragm orifice

The time of symptom onset in the third atrium is related to the size of the diaphragm channel. Severe cases with a narrow diaphragm orifice can develop severe pulmonary congestion and shortness of breath shortly after birth, followed by severe pneumonia and congestive heart failure. The third atrium is a congenital cardiovascular malformation in which the left or right atrium is divided into two parts by the fibrous muscle septum due to embryonic developmental disorders. Is a rare congenital heart disease, accounting for about 0.1% of congenital heart disease. The triatrial heart usually refers to the left atrium divided into the accessory chamber and the true left atrium (connected to the left atrial appendage and communicating through the mitral valve and left ventricle). The right third atrial heart is rare, accounting for only about 8% of cases of the third atrial heart. There are many types of three-atrial heart types, which can be divided into three types of a, b, and c according to the position of the auxiliary room: type a, the auxiliary room is located above the true left atrium; type b, the auxiliary room is located behind the true left atrium; Type, the auxiliary room rides across the atrial septum. In terms of hemodynamics, it is roughly divided into mitral valve stenosis type and atrial septal defect type according to the traffic situation of the accessory room and true left atrial, and the left and right atrial traffic.

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