Bulbar muscles are often involved the whole body can affect other muscle groups, vulnerable to upper respiratory tract infection and other reasons, induced myasthenic crisis.
延髓肌受累者常可累及全身其它骨骼肌群，极易因上呼吸道感染等原因而诱发肌无力危象。
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Conclusion The double contrast radiography of gastrointestinal tract is valuable in diagnosis of duodenal bulbar ulcer.