目的应用频繁静脉取血法在2型糖尿病患者中对回顾性动态血糖监测系统（CGMS）的点准确度及趋势准确度进行评价。方法2010年8月至10月共纳入11例2型糖尿病患者，应用美敦力公司GOLD^TM（GMS）连续监测3d血糖，同时每天输入4次指尖血糖值...目的应用频繁静脉取血法在2型糖尿病患者中对回顾性动态血糖监测系统（CGMS）的点准确度及趋势准确度进行评价。方法2010年8月至10月共纳入11例2型糖尿病患者，应用美敦力公司GOLD^TM（GMS）连续监测3d血糖，同时每天输入4次指尖血糖值进行校正。受试者在CGMS监测的3d内随机选择1d参加连续7h的频繁静脉取血（15min取1次），并用美国YSI STAT Plus^TM葡萄糖乳酸分析仪（YSI值）进行血浆葡萄糖值的测定。应用多种统计方法和统计量来综合进行准确性评估，包括CGMS值和匹配的YSI值相比在20％和30％偏差范围内的一致率、误差栅格分析、绝对差值的相对数（ARD）、Bland—Ahman分析以及趋势分析等。两变量相关分析采用Pearson相关分析。结果11例患者共收集到319对YSI—CGMS配对数据值；与YSI值相比，88．4％（95％CI：0．84—0．92）的CGMS值在20％偏差范围内，96．9％的CGMS值在30％偏差范围内。Clarke误差栅格分析显示YSI—CGMS配对数据值进入A区和B区的比例分别为88％、12％，共识误差栅格分析显示进入A区和B区的比例分别为96．2％、3．8％。连续误差栅格分析显示YSI—CGMS配对数据值在准确数据区、良性错误区及错误数据区分别为94．4％、2．8％及2．8％。ARD的均值为10．5％，中位数为8．4％，Bland—Altman分析均值为0．47mmol/L（95％CI：-1．90-3．01）。趋势分析显示82．5％的两者变化率差异集中在0．06mmol·L^-1·min^-1的变化范围内，只有1．7％的数据对绝对差异超过0．17mmd·L^-1·min^-1。结论无论对点时血糖还是对血糖变化趋势的反映，CGMS均有较好的准确性；但对低血糖事件进行评判时，尚需结合临床实际情况具体分析。展开更多
In this paper,a implicit difference scheme is proposed for solving the equation of one_dimension parabolic type by undetermined paameters.The stability condition is r=αΔt/Δx 2 1/2 and the truncation error is o(...In this paper,a implicit difference scheme is proposed for solving the equation of one_dimension parabolic type by undetermined paameters.The stability condition is r=αΔt/Δx 2 1/2 and the truncation error is o(Δt 4+Δx 4) It can be easily solved by double sweeping method.展开更多
BACKGROUND The FreeStyle Libre flash glucose monitoring(FGM)system entered the Chinese market in 2017 to complement the self-monitoring of blood glucose.Due to its increased usage in clinics,the number of studies inve...BACKGROUND The FreeStyle Libre flash glucose monitoring(FGM)system entered the Chinese market in 2017 to complement the self-monitoring of blood glucose.Due to its increased usage in clinics,the number of studies investigating its accuracy has increased.However,its accuracy has not been investigated in highland populations in China.AIM To evaluate measurements recorded using the FreeStyle Libre FGM system compared with capillary blood glucose measured using the enzyme electrode method in patients with type 2 diabetes(T2D)who had migrated within 3 mo from highlands to plains.METHODS Overall,68 patients with T2D,selected from those who had recently migrated from highlands to plains(within 3 mo),were hospitalized at the Department of Endocrinology from August to October 2017 and underwent continuous glucose monitoring(CGM)with the FreeStyle Libre FGM system for 14 d.Throughout the study period,fingertip capillary blood glucose was measured daily using the enzyme electrode method(Super GL,China),and blood glucose levels were read from the scanning probe during fasting and 2 h after all three meals.Moreover,the time interval between reading the data from the scanning probe and collecting fingertip capillary blood was controlled to<5 min.The accuracy of the FGM system was evaluated according to the CGM guidelines.Subsequently,the factors influencing the mean absolute relative difference(MARD)of this system were analyzed by a multiple linear regression method.RESULTS Pearson’s correlation analysis showed that the fingertip and scanned glucose levels were positively correlated(R=0.86,P=0.00).The aggregated MARD of scanned glucose was 14.28±13.40%.Parker's error analysis showed that 99.30%of the data pairs were located in areas A and B.According to the probe wear time of the FreeStyle Libre FGM system,MARD_(1 d) and MARD_(2-14 d) were 16.55%and 14.35%,respectively(t=1.23,P=0.22).Multiple stepwise regression analysis showed that MARD did not correlate with blood glucose when the largest amplitude of glycemic excursion(L展开更多
文摘目的应用频繁静脉取血法在2型糖尿病患者中对回顾性动态血糖监测系统（CGMS）的点准确度及趋势准确度进行评价。方法2010年8月至10月共纳入11例2型糖尿病患者，应用美敦力公司GOLD^TM（GMS）连续监测3d血糖，同时每天输入4次指尖血糖值进行校正。受试者在CGMS监测的3d内随机选择1d参加连续7h的频繁静脉取血（15min取1次），并用美国YSI STAT Plus^TM葡萄糖乳酸分析仪（YSI值）进行血浆葡萄糖值的测定。应用多种统计方法和统计量来综合进行准确性评估，包括CGMS值和匹配的YSI值相比在20％和30％偏差范围内的一致率、误差栅格分析、绝对差值的相对数（ARD）、Bland—Ahman分析以及趋势分析等。两变量相关分析采用Pearson相关分析。结果11例患者共收集到319对YSI—CGMS配对数据值；与YSI值相比，88．4％（95％CI：0．84—0．92）的CGMS值在20％偏差范围内，96．9％的CGMS值在30％偏差范围内。Clarke误差栅格分析显示YSI—CGMS配对数据值进入A区和B区的比例分别为88％、12％，共识误差栅格分析显示进入A区和B区的比例分别为96．2％、3．8％。连续误差栅格分析显示YSI—CGMS配对数据值在准确数据区、良性错误区及错误数据区分别为94．4％、2．8％及2．8％。ARD的均值为10．5％，中位数为8．4％，Bland—Altman分析均值为0．47mmol/L（95％CI：-1．90-3．01）。趋势分析显示82．5％的两者变化率差异集中在0．06mmol·L^-1·min^-1的变化范围内，只有1．7％的数据对绝对差异超过0．17mmd·L^-1·min^-1。结论无论对点时血糖还是对血糖变化趋势的反映，CGMS均有较好的准确性；但对低血糖事件进行评判时，尚需结合临床实际情况具体分析。
文摘In this paper,a implicit difference scheme is proposed for solving the equation of one_dimension parabolic type by undetermined paameters.The stability condition is r=αΔt/Δx 2 1/2 and the truncation error is o(Δt 4+Δx 4) It can be easily solved by double sweeping method.
基金Supported by Health and Family Planning Project of Sichuan Province,No.17PJ069Tibet Autonomous Region Science and Technology Program,No.XZ202303ZY0011G.
文摘BACKGROUND The FreeStyle Libre flash glucose monitoring(FGM)system entered the Chinese market in 2017 to complement the self-monitoring of blood glucose.Due to its increased usage in clinics,the number of studies investigating its accuracy has increased.However,its accuracy has not been investigated in highland populations in China.AIM To evaluate measurements recorded using the FreeStyle Libre FGM system compared with capillary blood glucose measured using the enzyme electrode method in patients with type 2 diabetes(T2D)who had migrated within 3 mo from highlands to plains.METHODS Overall,68 patients with T2D,selected from those who had recently migrated from highlands to plains(within 3 mo),were hospitalized at the Department of Endocrinology from August to October 2017 and underwent continuous glucose monitoring(CGM)with the FreeStyle Libre FGM system for 14 d.Throughout the study period,fingertip capillary blood glucose was measured daily using the enzyme electrode method(Super GL,China),and blood glucose levels were read from the scanning probe during fasting and 2 h after all three meals.Moreover,the time interval between reading the data from the scanning probe and collecting fingertip capillary blood was controlled to<5 min.The accuracy of the FGM system was evaluated according to the CGM guidelines.Subsequently,the factors influencing the mean absolute relative difference(MARD)of this system were analyzed by a multiple linear regression method.RESULTS Pearson’s correlation analysis showed that the fingertip and scanned glucose levels were positively correlated(R=0.86,P=0.00).The aggregated MARD of scanned glucose was 14.28±13.40%.Parker's error analysis showed that 99.30%of the data pairs were located in areas A and B.According to the probe wear time of the FreeStyle Libre FGM system,MARD_(1 d) and MARD_(2-14 d) were 16.55%and 14.35%,respectively(t=1.23,P=0.22).Multiple stepwise regression analysis showed that MARD did not correlate with blood glucose when the largest amplitude of glycemic excursion(L
