患者突然发生第三度房室传导阻滞，心率40次/分，应首选（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30903' and id < 2486352 and id<>'2486352' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30903' and id > 2486352 and id<>'2486352' order by id asc limit 5