目的　胃食管反流 (GER)在右侧卧位比左侧卧位增加。食管酸暴露与贲门的酸度有关。但体位对贲门口酸度的影响尚无研究。我们的目的是研究右侧卧位增加食管酸暴露的基本机制。方法　在不同日的情况下 ,10名健康者进食高脂肪餐后取左侧和右侧位同时检测 4h的食管和食管下段括约肌 Purpose Gastroesophageal reflux (GER) increases in the right lateral position compared with the left lateral position. Esophageal acid exposure and acidity of the cardia. However, the effect of body position on cardiac acidity has not been studied. Our aim was to investigate the underlying mechanism of increased esophageal acid exposure in the right lateral decubitus. Methods At different days, 10 healthy subjects were given high-fat meal and the right and left sides of esophagus and lower esophageal sphincter