And this has the effect of increasing pulmonary vascular resistance, and to maintain pulmonary blood flow, the body responds by developing pulmonary hypertension.

肺内的血管阻力因此会升高，为了维持肺内血流，机体会形成肺高压。

What's important though is that since the fetus doesn't use their lungs yet, there's relatively high vascular resistance and therefore high pressure in the pulmonary circulation.

而需要记住的是，由于胎儿还没有使用他们的肺，肺循环内血管阻力较大，因而压力也较高。

But simple procedures such as squatting and the knee chest position which increase systemic vascular resistance and therefore decrease right to left shunting , can help to temporarily relieve symptoms.

但是简单的方法，例如蹲踞和膝胸位的姿势可增加体循环血管的阻力，因此减少右向左分流，可以暂时缓解症状。