Effect of catalpol on senile plaques and spatial learning and memory ability in amyloid-β protein precursor/presenilin 1 double transgenic mice / 中华神经科杂志

Objective To investigate whether catalpol affects senile plaque formation and spatial learning and memory ability in the amyloid-β protein precursor/presenilin 1 (APP/PSI) double transgenic mice.Methods Three month-old APP/PS1 double transgenic mice were randomly divided into catalpoltreated and saline-treated groups (n =10),with C57 mice of the same age and genetic background as normal control group (n =10).The catalpol (in a dose of 5 mg · kg-1 · d-1) and the same amount of saline were peritoneally injected into Alzheimer' s disease (AD) model mice for 3 weeks.Immunohistochemical staining was performed to examine senile plaques in the brain of AD model mice,and Morris water maze was used to assess the spatial learning and memory abilities of the mice.Results Compared with the saline-treated AD model mice (6.0 ±0.6),the number of senile plaques of catalpol treated AD mice significantly decreased (2.3± 0.7; t =3.500,P =0.025); Mice in each groups had similar latency and path length to reach platform in visible platform test; In hidden platform test,catalpol-treated mice had a significant lesser latency and path length compared with saline-treated mice,furthermore,catalpol-treated mice had much more platform-crossing times (6.4 ± 0.8) than saline-treated mice (2.9 ± 0.4 ; t =5.592,P =0.001).Conclusion Catalpol can significantly decrease the senile plaque formation and improve the spatial learning and memory abilities of APP/PS1 double transgenic mice.

Analysis of arterial blood gas for 113 patients with acute respiratory stress syndrome / 重庆医学

Objective　To explore the significance of dynamic determination of arterial blood gas for early diagnosis, treatment and prognosis of patients with acute respiratory stress syndrome(ARDS). Methods　The results of 655 times arterial blood gas assayed in 113 patients with ARDS were analysed retrospectively.Results　(1)Types of acid-basic disturbance:The simple acid-base disturbances were 44 cases,in which respiratory alkalosis were 20 cases, respiratory acidosis 11 cases, metabolic acidosis 10 cases, metabolic alkalosis 3 cases. Complex acid-base disturbances were 53 cases,in which respiratory alkalosis with metabolic acidosis were12 cases, respiratory alkalosis with metabolic alkalosis 14 cases, respiratory acidosis with metabolic acidosis 21 cases, respiratory alkalosis with metabolic alkalosis 6 cases. Triple acid-base disturbances (TABD) were 16 cases, in which the type of respiratory alkalosis were 11 cases, the type of respiratory acidosis 5 cases. the types of acid-base disturbances in cured patients mainly were respiratory alkalosis (17 cases) and respiratory alkalosis with metabolic alkalosis (12 cases). The types of acid-base disturbances in dead patients were mainly respiratory acidosis with metabolic acidosis (19 cases),TABD (14 cases) and respiratory acidosis (9 cases).(2)The oxygenation indexes(PaO2/FiO2) of all 113 patients were less than 26.7kPa.(3)The cured rate in 113cases was 53/113(46.0%)and the mortality was 61/113(54.0%).Conclusion　Dynamic determination of arterial blood gas and calculation of index of oxygenation were of important clinical value in diagnosis and treatment of ARDS.