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(1) VSD : L to R 若是肺循環量大於體循環量Qp:Qs >2.5:1,
會造成pulmonary hypertension,
右心的壓力>左心造成 R to L shunt ,
左心的充氧血會混到右心來的缺氧血 => (cyanosis, Eisenmenger syndrome)
(2) ASD : L to R
(3) PDA : L to R
(4) ECD(ASD + VSD) : L to R shunt ==> pulmonary hypertension => Eisenmenger syndrome R to L
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