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| Pulmonary stenosis ： ウィキペディア英語版 |
Pulmonic stenosis
Pulmonic stenosis, also known as pulmonary stenosis, is a dynamic or fixed obstruction of flow from the right ventricle of the heart to the pulmonary artery. It is usually first diagnosed in childhood.
Pulmonic stenosis is usually due to isolated valvular obstruction (Pulmonary valve stenosis), but may be due to subvalvular or supravalvular obstruction. It may occur in association with more complicated congenital heart disorders.
==Pathophysiology==
When pulmonary stenosis (PS) is present, resistance to blood flow causes right ventricular hypertrophy. If right ventricular failure develops, right atrial pressure will increase, and this may result in a persistent opening of the foramen ovale, shunting of unoxygenated blood from the right atrium into the left atrium, and systemic cyanosis. If Pulmonary Stenosis is not severe, congestive heart failure occurs, and systemic venous engorgement will be noted. An associated defect such as a patent ductus arteriosus partially compensates for the obstruction by shunting blood from the left ventricle to the aorta then back to the pulmonary artery (as a result of the higher pressure in the left ventricle) and back into the lungs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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