右心室肥大引起右向左分流，导致发绀。
The obstruction to right ventricular outflow creates a right-to-left shunt that leads to cyanosis.
目的：探讨右心声学造影对心内由右向左分流半定量诊断的价值。
Objective: This paper was designed to investigate the semiquantitative diagnostic value of intracardiac right-to-left shunts by right heart contrast echocardiography.
ES是由长期左向右分流引起，该左向右分流诱导了肺血管改变，导致分流方向逆转即右向左分流。
Es is caused by long-standing left-to-right shunt lesions, which induce pulmonary vascular changes, resulting in reversal of the shunt flow.
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