Pulmonary arterial hypertension (PAH) can complicate several types of congenital heart disease, and its reversibility is often difficult to predict.

很多类型的先天性心脏病由于发生肺动脉高压而变得更加复杂，并且肺高压的可逆性常难以预测。

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Background - Congenital heart disease can be complicated by pulmonary arterial hypertension (PAH), the reversibility of which is often difficult to predict.

背景-——先心病由于肺动脉高压而变得更加复杂，肺动脉高压的可逆性常难以预测。

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Background - Congenital heart disease can be complicated by pulmonary arterial hypertension (PAH), the reversibility of which is often difficult to predict.

背景-——先心病由于肺动脉高压而变得更加复杂，肺动脉高压的可逆性常难以预测。

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