ABSTRACT
Objective The aim of this study was to establish a rat model of blood hypercoagulable state by intra?venous injection of thrombin and to provide a model for researches on hypercoagulable state. Methods Rats were divided into six groups and were injected with normal saline and 2?5, 5, 10, 20, 40 U/kg thrombin solution through the femoral vein, respectively. Then, blood was drawn to test the activated partial thromboplastin time (APTT), prothrombin time ( PT) and fibrinogen ( FIB) , and to observe the death rate of rats in these groups to verify the optimal dosage. On this ba?sis, rats were injected thrombin of the best dose through the femoral vein, and blood samples were collected at 0, 10, 30, 60, 120, 180, 300 (s) to test APTT and PT and FIB for determining the best time for blood sampling. At last, the rats were divided into control group and thrombin group to inject normal saline or thrombin solution in the best dose via the fem?oral vein, and blood was taken at the best time to test APTT, PT, FIB and whole blood viscosity. Results APTT and PT values of the 10 U/kg thrombin group were the shortest, and FIB value of this group was the highest among these groups. APTT and PT values of blood sample collected at about 60 s after thrombin injection were the shortest, and FIB value was the highest. Compared with the control group, PT and APTT values of the thrombin group were shorter (P<0?05), and blood viscosity and FIB were higher ( P<0?05 ) . Conclusions Injecting thrombin solution into the femoral vein can be used to establish a rat model of hypercoagulable state. The best dose of thrombin solution is 10 U/kg in a concentration of 2 U/mL. The best time to collect blood sample is 60 s.
ABSTRACT
Aim To study the effects of luteolin on the expression of TGF-?1 mRNA in rats with pulmonary fibrosis, and elaborate the molecular mechanism of luteolin in pulmonary fibrosis therapy. Methods The model of pulmonary fibrosis was established through instilling bleomycin intratracheally. After luteolin treatment, the pulmonary index and the content of hydroxyproline (HYP) were observed. The levels of TGF-?1 mRNA in pulmonary tissues were determined with RT-PCR. Results The pulmonary index and the content of HYP decreased markedly in pulmonary fibrosis rats treated with luteolin. Furthermore, luteolin inhibited evidently the expression of TGF-?1 mRNA in lung tissues with pulmonary fibrosis. Conclusion The molecular mechanism of luteolin in pulmonary fibrosis therapy was associated with inhibition of the expression of TGF-?1 mRNA.
ABSTRACT
Gelofusine is a plasma substitute made from modified fluid gelatin,it's hemodynamic and biochemical effects on organism were studied in 6 anesthetized dogs and 20 patients scheduled for undergoing open heart surgery(OHS). Different degree of isovolemic acute hemodilution was achieved by supplying the gelofusion at the same amount of blood withdrawn. The results showed,in patients group, after hemodilution, no significant changs were observed in HR, MAP, DO_2 and CaO_2, wherease, CO, CI, and VO_2 increased. In dog group, HR and MAP remained, CaO_2 and SVRI decreased, CO, CI, DO_2 and VO_2 increased at the degree of isovolemic hemodilution less than 20 ml/kg, DO_2 began to decrease at the degree of hemodilution greater than 20ml/kg. In both groups, there's no significant changes in the concentration of K~+, Na~+ ,CI~- and pH value after hemodilution. Our findings supports previous observation about gelofusion's effect to maintain the blood volume and reserve the hemostasis,in addition,it has no deterious effect on coagulation
ABSTRACT
Object To study the effects of gypenosides on MAO and Na/K ATPase activities in brain tissues of aging mice Methods Models of aging mice were prepared by continuous post orbitol injection of 120 mg/kg D galactose for a month, then the effects of gypenosides on MAO and Na/K ATPase activities in brain tissues were investigated Results It was observed that MAO activity was increased and Na/K ATPase activity was decreased in brain tissues of aging mice models significantly; and these effects were reversible respectively by gypenosides ig of 75 and 150 mg/kg Conclusion The result that gypenosides could invert the changes of MAO and Na/K ATPase activities in brain tissues of aging mice, may provide a further explaination of the anti aging mechanism of gypenosides in molecule enzymology
ABSTRACT
The aim of this study was to evaluate the accuracy of transtracheal doppler (TTD) cardiac output monitoring. Eleven mongrel dogs (weight: 8～15kg) were anesthetized with intravenous thiopental 20mg?kg~(-1), and the doppler tube was inserted into trachea and fixed at a proper position where clear signal was received, and the catheter with thermistor was passed into pulmonary artery via femoral vein. CO were measured simultanously by thermodilution (TD) and TTD in the basic state, during 10 mins after intravenous administration of propofol 2mg?kg~(-1), in 30 mins following intravenous dopamine 100?g?kg~(-1) or under condition of isovolumic hemodilution in sequence. The results demonstrated that the CO measured by TTD correlated positively with that by TD (r=0.88, P