5岁男孩,自幼瘦弱,不爱活动,易疲劳,来院确诊无青紫,胸骨左缘Ⅲ~Ⅳ肋间可闻及3~4/6级收缩期杂音,粗糙且伴震颤,肺动脉第二音亢进。此患儿预后取决于()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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