Endoscopic papillectomy for ampullary adenomatous lesions:A literature review

Ampullary adenomatous lesions of the gastrointestinal tract are rare and can be asymptomatic.Therefore,ampullary adenomas with malignant potential require prompt removal,regardless of whether they are adenomatous or carcinomatous lesions.Endoscopic papillectomy is a safe and effective alternative therapy to surgery to treat duodenal papillary lesions in selected patients.Accurate preoperative diagnosis and staging of ampullary adenomatous lesions are critical for predicting prognosis and determining the most appropriate therapeutic approach.Furthermore,the management and prevention of adverse events and endoscopic treatment for remnant or recurrent lesions and surveillance are essential for successful endoscopic management of ampullary adenomatous lesions.This literature review was based on PubMed and MEDLINE and focused on recent advancements in the endoscopic papillectomy technique to provide a comprehensive view of endoscopic papillectomy to treat ampullary adenomatous lesions.

三种气温预报产品黑龙江省预报效果检验

利用T639模式预报产品和黑龙江省83个国家气象站气温实况观测资料,采用最优预报因子方法选取预报因子,应用多元回归方法建立逐站日最高气温和日最低气温的MOS预报方程;对MOS、中央气象台指导预报(SCMOC)和T639三种气温预报产品的日最高气温和日最低气温预报效果进行对比检验分析,并用EOF方法检验预报与实况的时空变化特征一致性。结果表明:与实况的时空变化一致性方面,MOS和SCMOC较好,T639略差;预报效果方面,MOS和SCMOC对日最高气温和日最低气温的2℃预报准确率普遍高于T639,MOS的预报准确率在日最高气温方面高于SCMOC,在日最低气温方面低于SCMOC;MOS对T639气温预报产品改善效果明显,尤其对冬季日最低气温的预报改善效果十分显著;MOS较T639气温预报改善效果与T639模式预报效果呈负相关关系,主要表现为,MOS预报改善效果在T639预报准确率低的山区明显优于平原,在春、夏季,预报准确率较低的日最高气温明显优于日最低气温,在冬季,预报准确率较低的日最低气温优于日最高气温;MOS气温预报方法的预报性能较理想,SCMOC对黑龙江省预报难度较大的日最低气温预报效果较好。