目的探究脓毒症及感染性休克时舌下微循环与肠系膜微循环的关系，以及舌下、肠系膜微循环与整体血流动力学的关系。方法采用12头五指山近交系小型猪，随机分为对照组（n=6）和脓毒症组（n=6）。采用自体粪便注入腹腔方法制备腹膜炎脓毒...目的探究脓毒症及感染性休克时舌下微循环与肠系膜微循环的关系，以及舌下、肠系膜微循环与整体血流动力学的关系。方法采用12头五指山近交系小型猪，随机分为对照组（n=6）和脓毒症组（n=6）。采用自体粪便注入腹腔方法制备腹膜炎脓毒症模型。对照组仅做肠扰动。两组皆连续监测动脉血压、中心静脉压及每小时尿量。实验组猪模型制备完成后，分别于0、4、8、12h采用旁流暗视野技术（sidestream dark field imaging techniques，SDF）采集舌下及肠系膜微循环图像，猪休克后[平均动脉压（MAP）≤65mmHg]分别采集0、2、4h舌下及肠系膜微循环图像，微循环采用总血管密度（TVD）、灌注血管密度（PVD）、灌注血管比例（PPV）、微血管流动指数（MFI）作为观察指标，微循环指标由AVA3．0软件进行半定量分析。同时留取动脉血监测动脉血氧分压（PaO2）、二氧化碳分压（PaCO2）及血乳酸（Lac），相同时间点监测心率（HR）、平均动脉压（MAP）、心指数（CI）。结果①脓毒症模型制备8h后实验组猪舌下微循环和肠系膜微循环PPV和MFI与基线比较明显下降（〉30％，P〈0．05），实验组猪在出现感染性休克时舌下和肠系膜微循环PPV和MFI下降更为明显（〉50％，P〈0．05）。PVD较晚出现明显差异，舌下微循环和肠系膜微循环分别在制模12h及休克后0h出现；舌下微循环和肠系膜微循环TVD在整个实验过程中变化差异无统计学意义。②实验组猪舌下微循环和肠系膜微循环变化有明显的相关性（MFI：r=0．60，P〈0．01；TVD：r=0．284，P〈0．01；PVD：r=0．492，P〈0．01；PPV：r=0．705，P〈0．01）。③实验组猪休克前，CI与舌下微循环及肠系膜微循环PPV、MFI均存在相关性。休克后CI与舌下微循环及肠系膜微循环各指标均无相关性。休克前后舌下微循环及肠系膜微循环与MAP均无相关性。在脓毒症模型制备后12h，MAP〉100mmHg，舌下微循环及肠系膜微循环PPV、MFI均在模型制备后8h出现明显下降。微循环改变发生在MAP下降之前。结论①脓毒症及感染性休克猪存在微循环改变，且在感染性休克时微循环障碍更严重；②舌下微循环与肠系膜微循环存在相关性，可以通过SDF技术监测舌下微循环间接反映脏器微循环的变化；③微循环的改变发生在MAP下降之前。展开更多
A simple SI epidemic model with age of vaccination is discussed in this paper. Both varing birth rate,the mortality rate caused by disease and vaccine waning rate are considered in this model.We prove that the global ...A simple SI epidemic model with age of vaccination is discussed in this paper. Both varing birth rate,the mortality rate caused by disease and vaccine waning rate are considered in this model.We prove that the global dynamics is completely determined by the basic reproductive number R(Ψ)(Ψdenotes per capita vaccination rate).If R(0)＜1, the disease-free equilibrium is a global attractor;If R(Ψ)＜1,the disease-free equilibrium is locally asymptotically stable;If R(Ψ)＞1,an unique endemic equilibrium exists and is locally asymptotically stable under certain condition.展开更多
This work deals with the dissipative generalized Korteweg-de Vries (gKdV) equations of the formu t + u 2u x + u xxx-bu xx+ ru = f, t≥0, u(0,x) = u 0(x)∈V = H 2 2π,with periodic boundary conditions. It is proved tha...This work deals with the dissipative generalized Korteweg-de Vries (gKdV) equations of the formu t + u 2u x + u xxx-bu xx+ ru = f, t≥0, u(0,x) = u 0(x)∈V = H 2 2π,with periodic boundary conditions. It is proved that there exists an inertial manifold for the semiflow generated by this equation in space V. Since such a manifold is finite dimensional, positively invariant, and exponentially attracting of all the solution trajectories, the long-time dynamics of the dissipative gKdV equations are determined by a finite number of modes without the soliton phenomena.展开更多
文摘目的探究脓毒症及感染性休克时舌下微循环与肠系膜微循环的关系，以及舌下、肠系膜微循环与整体血流动力学的关系。方法采用12头五指山近交系小型猪，随机分为对照组（n=6）和脓毒症组（n=6）。采用自体粪便注入腹腔方法制备腹膜炎脓毒症模型。对照组仅做肠扰动。两组皆连续监测动脉血压、中心静脉压及每小时尿量。实验组猪模型制备完成后，分别于0、4、8、12h采用旁流暗视野技术（sidestream dark field imaging techniques，SDF）采集舌下及肠系膜微循环图像，猪休克后[平均动脉压（MAP）≤65mmHg]分别采集0、2、4h舌下及肠系膜微循环图像，微循环采用总血管密度（TVD）、灌注血管密度（PVD）、灌注血管比例（PPV）、微血管流动指数（MFI）作为观察指标，微循环指标由AVA3．0软件进行半定量分析。同时留取动脉血监测动脉血氧分压（PaO2）、二氧化碳分压（PaCO2）及血乳酸（Lac），相同时间点监测心率（HR）、平均动脉压（MAP）、心指数（CI）。结果①脓毒症模型制备8h后实验组猪舌下微循环和肠系膜微循环PPV和MFI与基线比较明显下降（〉30％，P〈0．05），实验组猪在出现感染性休克时舌下和肠系膜微循环PPV和MFI下降更为明显（〉50％，P〈0．05）。PVD较晚出现明显差异，舌下微循环和肠系膜微循环分别在制模12h及休克后0h出现；舌下微循环和肠系膜微循环TVD在整个实验过程中变化差异无统计学意义。②实验组猪舌下微循环和肠系膜微循环变化有明显的相关性（MFI：r=0．60，P〈0．01；TVD：r=0．284，P〈0．01；PVD：r=0．492，P〈0．01；PPV：r=0．705，P〈0．01）。③实验组猪休克前，CI与舌下微循环及肠系膜微循环PPV、MFI均存在相关性。休克后CI与舌下微循环及肠系膜微循环各指标均无相关性。休克前后舌下微循环及肠系膜微循环与MAP均无相关性。在脓毒症模型制备后12h，MAP〉100mmHg，舌下微循环及肠系膜微循环PPV、MFI均在模型制备后8h出现明显下降。微循环改变发生在MAP下降之前。结论①脓毒症及感染性休克猪存在微循环改变，且在感染性休克时微循环障碍更严重；②舌下微循环与肠系膜微循环存在相关性，可以通过SDF技术监测舌下微循环间接反映脏器微循环的变化；③微循环的改变发生在MAP下降之前。
基金Supported by the NSF of China（10371105） Supported by the Youth Science Foundation of Xinyang Normal University（20060202）
文摘A simple SI epidemic model with age of vaccination is discussed in this paper. Both varing birth rate,the mortality rate caused by disease and vaccine waning rate are considered in this model.We prove that the global dynamics is completely determined by the basic reproductive number R(Ψ)(Ψdenotes per capita vaccination rate).If R(0)＜1, the disease-free equilibrium is a global attractor;If R(Ψ)＜1,the disease-free equilibrium is locally asymptotically stable;If R(Ψ)＞1,an unique endemic equilibrium exists and is locally asymptotically stable under certain condition.
文摘This work deals with the dissipative generalized Korteweg-de Vries (gKdV) equations of the formu t + u 2u x + u xxx-bu xx+ ru = f, t≥0, u(0,x) = u 0(x)∈V = H 2 2π,with periodic boundary conditions. It is proved that there exists an inertial manifold for the semiflow generated by this equation in space V. Since such a manifold is finite dimensional, positively invariant, and exponentially attracting of all the solution trajectories, the long-time dynamics of the dissipative gKdV equations are determined by a finite number of modes without the soliton phenomena.
