46患者,女性,72岁,吞咽困难6年,常反复发作,发病多与情绪波动或辛辣食物有关,进食时需大量饮水以助干食下咽。近日来吞咽困难严重,常伴有食物反流,尤以变换体位时加剧。该患者最可能的病因是:( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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