胶囊内镜对十二指肠乳头的检出率及其影响因素分析

目的 分析胶囊内镜对十二指肠乳头及小肠疾病的检出率,探讨可能影响十二指肠乳头检出率的潜在因素.方法 回顾分析369例因疑似小肠疾病而行胶囊内镜检查患者的十二指肠乳头检出率及小肠疾病检出率.为了解直视内镜对十二指肠乳头的漏检率,另对369例胃镜检查患者统计其十二指肠乳头检出率.对胶囊内镜分别采用手动逐帧及15帧/s2种速率进行读片,统计2种读片速率的十二指肠乳头检出率及每例检出者所获取乳头图片的帧数.计算胶囊内镜检查者中不同性别与年龄组间十二指肠乳头检出率差异有无统计学意义.统计胶囊内镜检查前不同肠道准备组间分别在手动逐帧、15帧/s2种读片速率时十二指肠乳头检出率差异有无统计学意义.结果 标准直视胃镜的十二指肠乳头漏诊率为22.0%;手动逐帧读片十二指肠乳头检出率明显高于15帧/s(32.2%比13.6%,P=0.001),检出时所需乳头图片的平均帧数前者少于后者(3.7帧比7.0帧);胶囊内镜对小肠疾病的检出率为67.2%,明显高于对十二指肠乳头的检出率32.2%(P=0.000);不同性别与年龄组问的十二指肠乳头检出率差异均无统计学意义;检查前各种肠道准备组问在不同读片速率时十二指肠乳头检出率差异亦均无统计学意义.结论　胶囊内镜对十二指肠乳头检出率较低,但不能简单地与其对小肠疾病的检出率划等号.影响胶囊内镜对十二指肠乳头检出率的主要因素包括十二指肠降部特殊的解剖结构、读片者浏览图片的速率及胶囊内镜本身的缺陷.

Influencing factors on the detection rate of duodenal papilla by capsule endoscopy

Objective To determine the detection rate of duodenal papilla and the diagnostic rate of small bowel diseases by capsule endoscopy(CE)and its possible influencing factors. Methods A total of 369 cases with suspected small bowel disease who had undergone CE were retrospectively reviewed. The de- tection rate of duodenal papilla and that of small bowel disease were calculated respectively. The detection rate of duodenal papilla in another 369 patients having received gastroscopy was also counted in order to findout the miss detection rate of forward-viewing endoscopy. The CE findings were reviewed at the rate of 1 im-age and 15 images per second by hand-motion respectively. The detection rate of duodenal papilla was calcu-lated,and the number of frames showing duodenal papilla was counted. Differences of detection rate of duo-denal papilla were also analyzed by different age and gender groups. In addition,the potential difference in detection rate of duodenal papilla between different bowel preparations before CE of two different reviewing approaches was also investigated respectively. Results The miss detection rate of duodenal papilla with for-ward-viewing gastroscopy was 22. 0%. The detection rate of duodenal papilla reviewed at the rate of 1 image by hand-motion,where less frames were needed to visualize duodenal papilla(3. 7vs7. 0),was significantly higher than that at the rate of 15 images per second(32. 2%vs13. 6%,P=0. 001). The diagnostic rate of small bowel diseases was also significantly higher than that of duodenal papilla by CE(67. 2%vs32. 2%,P=0. 000). Age and gender were not significantly correlated with the detection rate of duodenal papilla. No significant correlation was found between various kinds of bowel preparation before CE at different viewing rate and the detection rate of duodenal papilla. Conclusion It iS relatively difficult to identify duodenal pa- pilla by CE,as they are peculiarly positioned in anatomy,so the detection of duodenal papilla does not nec- essarily represent the detection rate of small bowel diseases. The major factors that influencing the detection of duodenal papilla by CE include local anatomy,viewing rate and technical limitations of CE.