Lung artery a narrow cause of disease and pathology change _'s general knowledge

Lung artery a narrow cause of disease and pathology change _'s general knowledge
This disease is one kind of a common congenital heart disease, it is caused by a abnormal development of embryo, but may exist and continue the sending lung artery one is narrow, cause because of other diseases, if it can cause a disease to infect in foetus' palace.
1,Cause of disease
All kinds of lung the intersection of artery and the intersection of mouth and narrow their embryo the intersection of development and the intersection of obstacle and reason differ, in the 6th week such as development such as embryo, the artery bes and begins to separate and become aorta and lung artery, begin to form the primitive tubercles of three valves in the membrane in of lung artery, and grow in, then absorb and change thinly and form three lung artery ones, such as the valve is growing up the obstacle is taking place in the course, merge and become a dome-shaped mouth mouth that break out in juncture of three leaves, namely form the lung artery one is narrow. In lung while of a development of artery, taper department of the intersection of heart and ball is absorbed and flows out dish (funnel department) as the right ventricle ,If development obstacle form, flow out dishes of plump ring muscle and loose the intersection of skin and bunch span the intersection of room and wall and form right ventricle, flow out dishes of narrow funnel type promptly among the interval. In addition, the intersection of embryo and development, in the course, 6 become the left, right lung artery to the development of arch of aorta, it carry until lung arteriolar to link far, near end link with pulmonary trunk, until the intersection of development and obstacle form pulse promptly artery branch or pulmonary trunk narrow.
2,Pathology changes
( 1) The lung artery one is narrowMerge dome-shapedly and increase the thick diaphragm in three pieces of leaf juncture, dash for ward it in, a hole takes the form of fish's mouth, can lie in the centre or lean to one side, a hole only 2- 3mm of the small one, generally a hole merges the place in juncture of a leaf, often leaves one spine that slightly rises about 5- 12mm, most cases and three leaves merge each other, a few is merged for one pair of leaves, petals of reason increase thick often, have the intersection of wart and little tubercle, can form calcified plague while being even, lung the intersection of artery and petals of ring have the one at various degrees to be narrow generally, because the right ventricle is loose because obstruct in blood flow, can produce and continue the taking place right ventricle and flow out the plump narrow and right room of a dish of fat to expand and cause the tricuspid valve not to close completely. The lung artery can be after appearing narrowly the shape of the shuttleless loom is expanded, can often extend to the left lung artery, it is obviously greater than the aorta that the lung artery is always dry.
( 2) The funnel one is narrowTwo types appear: First kind narrow for lack of mutual understanding type, below taper portion, right ventricle flow out line form fibrous muscle diaphragm among the wall bunch, scoundrel of ridge, at the one room, separate and become two hearts not of uniform size of the right ventricle, thin funnel department that expands of the wall is called the third ventricle above it, it is a plump right ventricle of muscle to play, the two separate by the membrane centre there is a narrow narrow passage, the size is invited among 3-15mm, it is often narrow with the artery valve that this kind of diaphragm type is narrow to coexist at the same time, it is narrow to call the phenotype. The second kind is narrow for pipeline type, mainly shown as the right ventricle flows out a wall one storey of filling the air muscles is plump, form a longer narrow heart and one of passways, this type is narrow to often always do development with lung artery a ring and lung artery badly, so expand after being not so narrow as lung artery.
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