心电图示PR间期固定，且大于0. 21秒，无QRS 波群脱落，最可能的诊断是(    )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26323' and id < 2201257 and id<>'2201257' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26323' and id > 2201257 and id<>'2201257' order by id asc limit 5