患儿,女,3岁。病史显示其出生后青紫逐渐加重,查体发现杵状指,胸骨左缘第3肋间可闻Ⅲ级收缩期杂音,诊断为法洛四联症。为其行胸部X线检查,其结果最可能提示( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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