O. is a tunnel that connects the upper Chambers of the heart - the right atrium and the left atrium.

卵圆孔未闭会导致心脏上部腔体，即左心房和右心房之间存在一条通道连接。

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O. is a tunnel that connects the upper Chambers of the heart - the right atrium and the left atrium.

卵圆孔未闭会导致心脏上部腔体，即左心房和右心房之间存在一条通道连接。

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