心房颤动时，预防动脉栓塞最有效的药物是(    )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26316' and id < 2201552 and id<>'2201552' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26316' and id > 2201552 and id<>'2201552' order by id asc limit 5