女性，45岁。近期多次晕厥，查体发现坐位时在心尖部可闻及舒张期杂音，卧位消失，此患者晕厥原因可能是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28582' and id < 2332945 and id<>'2332945' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28582' and id > 2332945 and id<>'2332945' order by id asc limit 5