患儿,2岁,胸骨左缘三、四肋间可闻及Ⅳ级粗糙全收缩期杂音井广泛传导,可触及收缩期震频,肺动脉瓣区第2心音亢进,胸部X线显示主动脉界缩小,左房及左室、右室扩大。最可能的先心病是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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