女孩，7岁。因易疲劳、剧烈活动气促1年余 来诊。查体于胸骨左缘2 ~3肋间可闻2级SM。 超声心动图检查示房间隔紧邻上腔静脉处回声 脱失20mm。此症心电图的常见典型改变是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32563' and id < 2588026 and id<>'2588026' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32563' and id > 2588026 and id<>'2588026' order by id asc limit 5