Chronic gastritis is a persistent inflammation of the gastric mucosa. The Sydney System is the most widely used classification of this disease but it does not allow a ranking of patients according to the evolutionary ...Chronic gastritis is a persistent inflammation of the gastric mucosa. The Sydney System is the most widely used classification of this disease but it does not allow a ranking of patients according to the evolutionary potential of the disease, unlike the classifications: “Operative Link On Gastritis Assessment” (OLGA) and “Operative Link on Gastritis Intestinal Metaplasia Assessment” (OLGIM). Our goals are to apply and evaluate the three classifications: the Sydney System, OLGA and OLGIM and to draw possible correlations. This is a retrospective, descriptive, single-center study performed on all cases of chronic gastritis, diagnosed at the laboratory of Pathological Anatomy Unit of Joseph Ravoahangy Andrianavalona University Hospital from January 1, 2013 to December 31, 2017. A review and application of the three main classification systems was performed on each case. We included 298 cases. The mean age was 50.85 years. The sex ratio was 1.48. The high-risk stages according to the “Operative Link On Gastritis Assessment” (OLGA) system and the “Operative Link on Gastritis Intestinal Metaplasia Assessment” (OLGIM) system were 0.67% and 2.68%, respectively. We observed a correlation between the two systems with discordance of 5%. The use of the two new systems allows the assessment of the progressive potential of gastritis in patients at risk of developing gastric cancer. For optimal effectiveness of both classifications, biopsies should be performed according to the Sydney System recommendations.展开更多
利用全动态多相流模拟软件OLGA(Oil and Gas),对水平机动管线气顶排空过程管内气液混合物流动规律进行了数值模拟研究。重点研究了流量、压力、持液率随时间的变化规律,得到了入口初始排气压力0.5、0.7和0.9 MPa三种边界条件下管道内部...利用全动态多相流模拟软件OLGA(Oil and Gas),对水平机动管线气顶排空过程管内气液混合物流动规律进行了数值模拟研究。重点研究了流量、压力、持液率随时间的变化规律,得到了入口初始排气压力0.5、0.7和0.9 MPa三种边界条件下管道内部节点的流量、压力、持液率变化曲线,并与实验进行对比。计算结果表明:数值模拟结果与实验测试结果吻合较好,排空时间的仿真值在入口压力为0.9 MPa时最接近实验值,其余工况均小于实验值。液体前锋到达测试点前,流量的仿真值和实验值吻合较好,压力仿真值大于实验值,持液率仿真与实验值相同;液体前锋到达测试点之后,流量、压力和持液率的仿真值均小于实验值。根据实验管路结构和数值计算方法分析了以上现象的原因,验证了利用OLGA进行机动管线气顶排空数值模拟的可行性。展开更多
文摘Chronic gastritis is a persistent inflammation of the gastric mucosa. The Sydney System is the most widely used classification of this disease but it does not allow a ranking of patients according to the evolutionary potential of the disease, unlike the classifications: “Operative Link On Gastritis Assessment” (OLGA) and “Operative Link on Gastritis Intestinal Metaplasia Assessment” (OLGIM). Our goals are to apply and evaluate the three classifications: the Sydney System, OLGA and OLGIM and to draw possible correlations. This is a retrospective, descriptive, single-center study performed on all cases of chronic gastritis, diagnosed at the laboratory of Pathological Anatomy Unit of Joseph Ravoahangy Andrianavalona University Hospital from January 1, 2013 to December 31, 2017. A review and application of the three main classification systems was performed on each case. We included 298 cases. The mean age was 50.85 years. The sex ratio was 1.48. The high-risk stages according to the “Operative Link On Gastritis Assessment” (OLGA) system and the “Operative Link on Gastritis Intestinal Metaplasia Assessment” (OLGIM) system were 0.67% and 2.68%, respectively. We observed a correlation between the two systems with discordance of 5%. The use of the two new systems allows the assessment of the progressive potential of gastritis in patients at risk of developing gastric cancer. For optimal effectiveness of both classifications, biopsies should be performed according to the Sydney System recommendations.
文摘利用全动态多相流模拟软件OLGA(Oil and Gas),对水平机动管线气顶排空过程管内气液混合物流动规律进行了数值模拟研究。重点研究了流量、压力、持液率随时间的变化规律,得到了入口初始排气压力0.5、0.7和0.9 MPa三种边界条件下管道内部节点的流量、压力、持液率变化曲线,并与实验进行对比。计算结果表明:数值模拟结果与实验测试结果吻合较好,排空时间的仿真值在入口压力为0.9 MPa时最接近实验值,其余工况均小于实验值。液体前锋到达测试点前,流量的仿真值和实验值吻合较好,压力仿真值大于实验值,持液率仿真与实验值相同;液体前锋到达测试点之后,流量、压力和持液率的仿真值均小于实验值。根据实验管路结构和数值计算方法分析了以上现象的原因,验证了利用OLGA进行机动管线气顶排空数值模拟的可行性。
