Heart Valve Diseases ; therapy ; Humans

Objective To probe into active effect on nitric oxide and peroxynitrite interacts with lipids in Wistar rat.Methods Wister rat's aorta in vitro is perfused by superoxide anion and NO relative factors and the change of vascular cGMP and MDA level was observed.Results Wister rat's aorta in vivo perfused by lower and higher concentration H2O2,respectively made the vascular cGMP content increases 23.08%(P

Tests of effects on life of adult fruit fly of Cordyceps polysaccharides from submerged fermentation products showed that the polysaccharides had the activity against senescence. Some samples had very notable effect among which polysaccharides from AT01 (both intracellular and extracellular) had the best effects.

The expert system is an important field of the artificial intelligence. The traditional interface of the expert system is the command, menu and window at present. It limits the application of the expert system and embarrasses the enthusiasm of using expert system. Combining with the study on the expert system of network fault diagnosis, the natural language interface of the expert system has been discussed in this article. This interface can understand and generate Chinese sentences. Using this interface, the user and field experts can use the expert system to diagnose the fault of network conveniently. In the article, first, the extended production rule has been proposed. Then the methods of Chinese sentence generation from conceptual graphs and the model of expert system are introduced in detail. Using this model, the network fault diagnosis expert system and its natural language interface have been developed with Prolog.

A discrete time feedback control system model based on a multi-router network has been presented. The model can be described by a set of recurrence equations. The numerical examples about the bifurcation of average and instantaneous queue size along with the variety of RED control parameter are shown. The simulate experiments about those of the RED control parameters are also presented. All of these results show that instability in TCP-Reno traffic under RED can be induced by the inherent nonlinear behavior of the network.

ObjectiveTo assess the value of comfortable and maximum walking speed of outcome measuring for locomotion recovery after stroke.Methods10m walking speed of 32 stroke subjects who were able to walk independently were tested in the freely chosen and maximum. The motor function of the paretic lower limb and balance were evaluated with the Fugl-Meyer Assessment,Berg Balance Scale and ambulatory item of Functional Independence Measure. The level of association between gait speeds and the clinical variables were examined with Pearson's correlation coefficients.ResultsComfortable walking speed were significantly positively related to maximum walking speed(r=0.953,P<0.001),and balance, motor function of the lower limb and ambulatory function were significantly positively related to comfortable and maximum walking speed(r=0.742-0.834,P<0.001).The relationship between comfortable walking speed and clinical variables was higher(r=0.787-0.834,P<0.001).Conclusions Both comfortable and maximum walking speed can reflect locomotion recovery after stroke, but comfortable walking speed is more pragmatic,securer and more sensitive.

ObjectiveTo analyse the most important clinical variables determining walking speed in hemiparetic stroke patients.MethodsThirty-two stroke subjects were able to walk independently in the study.The freely chosen speed was determined by using 10m walking speed test.The motor function,strength of the paretic lower limb,and the balance were evaluated with the Fugl-Meyer Assessment, Motricity Index,and Berg Balance Scale.Modified Ashworth Scale was used to assess the muscle tone of the plantarflexors.The level of association between walking speed and the clinical variables were examined with Pearson's correlation coefficients and by multiple linear regression analysis by using the stepwise method.ResultsThe motor function,strength of the lower limb and the balance were significantly positive related to walking speed(r=0.781-0.834,P<0.001),and the muscle tone of the plantarflexor was moderate negative related to walking speed(r=-0.461,P<0.05).The regression analysis selected motor function of the lower limb as a significant variable(R2=0.696,P<0.001).ConclusionsThe motor function of the lower limb is the important clinical factor to determine the walking speed of stroke subjects.

Objective To assess the efficiency and methods of the interventional management in acute mesenteric venous thrombosis (AMVT). Methods Fifteen patients with AMVT who diagnosed by imageology were treated by interventional procedures. Eight patients were treated by transcatheter superior mesenteric artery thrombolysis with urokinase, 5 cases by percutaneous transhepatic treatment, 2 cases by transjugular intrahepatic portosystemic shunt approach. Results The technical success was achieved in all the 15 cases without complications. The majority of the thrombus was cleared by interventional procedures and flow restorated on the angiograms. All the patients with follow-up from 10 to 22 months showed no recurrence. Conclusion The minimally invasive interventional techniques are safe and effective in the treatment of mesenteric venous thrombosis without necrosis.

ObjectiveTo study the types of anatomical variations of hepatic arteries. Methods Hepatic arteries of 64-slice spiral CT scanning data were three-dimensional constructed by using self-designed software. The types of anatomical variations were analyzed and classified with Michels' classification criteria. Results The model presented with realistic profile of hepatic arteries which allowed vivid three-dimensional observation. Of these patients, 40 had normal hepatic arteries (60.61%), 26 had variations (39.39%), and 5 had infrequent aberrant hepatic arteries that was not included in Michels' classification (7.58%). Conclusion Three-dimensional model of hepatic arteries can volumetricly display the anatomical variations of hepatic arteries.

Objective To compare the curative effect of percutaneous endoscopic lumbar discectomy (PELD) and microendoscopic discectomy (MED) in lumbar disc herniation.Methods A literature search was performed in PubMed, Web of Science, Embase, Wanfang, CNKI. Two authors reviewed all articles individually. The methodological quality of RCTs was assessed by the Cochrane risk of bias tool, and the quality of retrospective studies was evaluated by the modified Newcastle-Ottawa scale. The data was extracted by the Review Manager 5.30.Results A total of 19 articles were brought into this Meta-analysis. The outcomes were divided into primary outcomes and secondary outcomes. Excerpt for the short-term VAS score was lower in PELD group (P = 0.010), other index, including long-term VAS score (P = 0.120), ODI score (P = 0.260), complication (P = 0.100) and recurrence (P = 0.100), didn't had significant difference in two groups. The blood loss (P = 0.000), hospital stay (P = 0.000) and the length of incision (P = 0.000) were all superiority in PELD group. Whereas the operative time was shorter in MED group (P = 0.001).Conclusion PELD was a more minimally invasive and secure technique in lumbar disc herniation.