目的通过动态增强磁共振(dynamic contrast enhanced magnetic resonance imaging,DCE-MRI)评价股骨头坏死高危人群股骨头微循环灌注的变化及正常人群股骨头内血流灌注的异质性,为超早期股骨头坏死提供影像学依据。材料与方法共选取50...目的通过动态增强磁共振(dynamic contrast enhanced magnetic resonance imaging,DCE-MRI)评价股骨头坏死高危人群股骨头微循环灌注的变化及正常人群股骨头内血流灌注的异质性,为超早期股骨头坏死提供影像学依据。材料与方法共选取50人60例股骨头,实验组为30例高危股骨头,对照组为30例正常股骨头,两组均行髋部DCE-MRI扫描,在股骨头负重区(前上方)、非负重区(下方)及股骨头中心区分别选取感兴趣区(region of interest,ROI),绘制百分比时间信号曲线(time-intensity curve,TIC),读取TIC上首次峰值(fEmax)、最高信号强度(Emax)、达峰时间(timetopeak,TTP)参数,通过独立样本t检验比较股骨头坏死高危人群股骨头不同ROI与正常股骨头相应区域ROI灌注参数的差异;股骨头负重区与非负重区及股骨头中心ROI灌注参数差异的比较采用方差分析。结果实验组与对照组负重区fEmax、Emax差异有统计学意义(P<0.05),实验组与对照组非负重区TTP差异有统计学意义(P<0.05),实验组与对照组股骨头中心区fEmax、Emax、TTP差异有统计学意义(P<0.05)。对照组内负重区、中心区fEmax、Emax大于非负重区fEmax、Emax,且差异有统计学意义(P<0.01),对照组内不同ROI间TTP差异无统计学意义(P>0.05)。结论股骨头坏死高危患者比正常人股骨头血流灌注低;正常人群中股骨头负重区与非负重区血流灌注具有异质性,负重区血流灌注较多。此外,高危人群股骨头血流灌注量小于健康人,灌注时间较正常股骨头长,存在血流瘀滞现象。因此,DCE-MRI可应用于指导临床进行早期预防股骨头坏死发生。展开更多
Objective:To investigate the pharmacokinetics of clindamycin phosphate vaginal gel in healthy Chinese female volunteers.Methods:Ten healthy Chinese female volun- teers were intravaginally given with 5.0g of clindamyci...Objective:To investigate the pharmacokinetics of clindamycin phosphate vaginal gel in healthy Chinese female volunteers.Methods:Ten healthy Chinese female volun- teers were intravaginally given with 5.0g of clindamycin phosphate vaginal gel (equivalent to 100mg of clindamycin) once for single dose treatment,and 5.0g,once a day for 3 days,for mul- tiple dose treatment.The serum concentration of clindamycin were determined by HPLC-MS method and its pharmacokinetic parameters of clindamycin were calculated by DAS 1.0 soft- ware.Results:The main pharmacokinetic parameters of clindamycin for single dose and multiple doses were as follows:t_(1/2) were (15.30±2.62) hours and (14.78±2.49) hours,Tmax were (4.88±0.94) hours and (4.70±0.59) hours,Cmax were (38.30±22.77) ng/ml and (44.87±26.71) ng/ml,AUC0_(-∞) were (783.45±351.19) ng·ml^(-1)·h^(-1) and (1015.68±456.95) ng·ml^(-1)·h^(-1),respectively.Conclusion:The Cmax of clindamycin phosphate vaginal gel after a single dose and multiple doses are obviously lower and t_(1,2) are longer than that of clindamycin phosphate oral preparations,which suggests that clindamycin phosphate vaginal gel acts locally and can be slowly absorbed to circulation for systemic actions.展开更多
文摘目的通过动态增强磁共振(dynamic contrast enhanced magnetic resonance imaging,DCE-MRI)评价股骨头坏死高危人群股骨头微循环灌注的变化及正常人群股骨头内血流灌注的异质性,为超早期股骨头坏死提供影像学依据。材料与方法共选取50人60例股骨头,实验组为30例高危股骨头,对照组为30例正常股骨头,两组均行髋部DCE-MRI扫描,在股骨头负重区(前上方)、非负重区(下方)及股骨头中心区分别选取感兴趣区(region of interest,ROI),绘制百分比时间信号曲线(time-intensity curve,TIC),读取TIC上首次峰值(fEmax)、最高信号强度(Emax)、达峰时间(timetopeak,TTP)参数,通过独立样本t检验比较股骨头坏死高危人群股骨头不同ROI与正常股骨头相应区域ROI灌注参数的差异;股骨头负重区与非负重区及股骨头中心ROI灌注参数差异的比较采用方差分析。结果实验组与对照组负重区fEmax、Emax差异有统计学意义(P<0.05),实验组与对照组非负重区TTP差异有统计学意义(P<0.05),实验组与对照组股骨头中心区fEmax、Emax、TTP差异有统计学意义(P<0.05)。对照组内负重区、中心区fEmax、Emax大于非负重区fEmax、Emax,且差异有统计学意义(P<0.01),对照组内不同ROI间TTP差异无统计学意义(P>0.05)。结论股骨头坏死高危患者比正常人股骨头血流灌注低;正常人群中股骨头负重区与非负重区血流灌注具有异质性,负重区血流灌注较多。此外,高危人群股骨头血流灌注量小于健康人,灌注时间较正常股骨头长,存在血流瘀滞现象。因此,DCE-MRI可应用于指导临床进行早期预防股骨头坏死发生。
文摘Objective:To investigate the pharmacokinetics of clindamycin phosphate vaginal gel in healthy Chinese female volunteers.Methods:Ten healthy Chinese female volun- teers were intravaginally given with 5.0g of clindamycin phosphate vaginal gel (equivalent to 100mg of clindamycin) once for single dose treatment,and 5.0g,once a day for 3 days,for mul- tiple dose treatment.The serum concentration of clindamycin were determined by HPLC-MS method and its pharmacokinetic parameters of clindamycin were calculated by DAS 1.0 soft- ware.Results:The main pharmacokinetic parameters of clindamycin for single dose and multiple doses were as follows:t_(1/2) were (15.30±2.62) hours and (14.78±2.49) hours,Tmax were (4.88±0.94) hours and (4.70±0.59) hours,Cmax were (38.30±22.77) ng/ml and (44.87±26.71) ng/ml,AUC0_(-∞) were (783.45±351.19) ng·ml^(-1)·h^(-1) and (1015.68±456.95) ng·ml^(-1)·h^(-1),respectively.Conclusion:The Cmax of clindamycin phosphate vaginal gel after a single dose and multiple doses are obviously lower and t_(1,2) are longer than that of clindamycin phosphate oral preparations,which suggests that clindamycin phosphate vaginal gel acts locally and can be slowly absorbed to circulation for systemic actions.