为了维持整个循环系统的正常运行，在休循环和肺循环之间一定存在联系。
肺动脉瓣狭窄是一种先天性疾病。特征是右心室流出道阻塞。
主动脉瓣喀喇音在心尖区听得最清楚，肺动脉瓣喀喇音则在胸骨左上缘最能听到。
一旦螺旋形隔板下降不全，主动脉和肺动脉干的血流将不能分开。
肺动脉高血压可加剧P2，肺动脉瓣狭窄时则P2减轻。
结果导致右心室的血流进入主动脉而左心室的血流则进入肺动脉。
1·Objective: to provide anatomic basis for choosing a donator with a suitable pulmonary artery diameter with receptor during extension of congenital pulmonic stenosis and lung transplantation.
目的：为先天性肺动脉狭窄扩张术和肺移植术选择与受体肺动脉直径相配的供体提供解剖学基础。
2·The most common causes are aortic or pulmonic valve regurgitation.
最常见的原因是主动脉瓣或肺动脉瓣反流。
3·The P wave changes had certain relations with lowering of pulmonic mean pressure.
波的改变可能与肺动脉平均压下降有关。
4·When the spiral septum fails to completely descend, the aortic and pulmonic trunks are left undivided at their outflow.
一旦螺旋形隔板下降不全，主动脉和肺动脉干的血流将不能分开。
5·P2 may be augmented in pulmonary hypertension and diminished in pulmonic stenosis.
肺动脉高血压可加剧P2，肺动脉瓣狭窄时则P 2减轻。