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排序方式: 共有54条查询结果,搜索用时 15 毫秒
1.
Reversal of granulocyte adherence to nylon fibers using local anesthetic agents: possible application to filtration leukapheresis 总被引:1,自引:0,他引:1
The effects of the cationic anesthetic agents tetracaine and lidocaine on granulocyte function, morphology, and adherence to nylon fibers were studied in an attempt to improve current methods of granulocyte collection by filtration leukapheresis (FL). When dissolved in acid- citrate-dextrose (ACD) plasma, these drugs significantly increased granulocyte elution from the fibers in a dose-related fashion. Granulocytes exposed to tetracaine and lidocaine remained more than 95% viable, retained normal bactericidal capacity after the drugs were washed from the cells, and had preserved membrane integrity, as evidenced by the normal ultrastructural appearance of tetracaine- exposed cells and an absence of leakage of lysozyme or lactic dehydrogenase. Granulocytes eluted with the anesthetic agents were rounded in shape with a reduction in the number of filopodial cytoplasmic projections and a relative absence of cytoplasmic vacuolization when compared to granulocytes eluted with ACD plasma alone. Dose-related inhibition of phagocytosis and adherence, which was largely reversible after washing the granulocytes, was noted. Greater than 95% of the lidocaine could be removed from the eluate with a single centrifugation and resuspension, indicating that granulocytes prepared by FL with anesthetic-enhanced elution could be potentially transfusable. 相似文献
2.
Durante W; Schini VB; Kroll MH; Catovsky S; Scott-Burden T; White JG; Vanhoutte PM; Schafer AI 《Blood》1994,83(7):1831-1838
We have investigated the role of platelets in regulating the hemostatic and vasomotor properties of vascular smooth muscle. Experiments were performed to examine the effect of the releasate from activated platelets on the production of nitric oxide from interleukin-1 beta (IL- 1 beta)-treated cultured rat aortic smooth muscle cells. Treatment of vascular smooth muscle cells with IL-1 beta resulted in significant accumulation of nitrite in the culture media and in marked elevation of intracellular cyclic guanosine monophosphate (GMP) levels. The releasate from collagen-aggregated platelets blocked the IL-1 beta- mediated production of nitrite and the accumulation of cyclic GMP in smooth muscle cells in a platelet number-dependent manner. In functional assays, the perfusates from columns containing IL-1 beta- treated smooth muscle cells relaxed detector blood vessels without endothelium and the addition of IL-1 beta-treated smooth muscle cells to suspensions of platelets inhibited their thrombin-induced aggregation. The simultaneous treatment of smooth muscle cells with IL- 1 beta and the platelet releasate abolished both the vasorelaxing activities of the perfusates and the inhibition of platelet aggregation. Platelet releasates treated with a neutralizing antibody to platelet-derived growth factor (PDGF) failed to block IL-1 beta- induced nitric oxide production by the smooth muscle cells, as measured by both biochemical and functional assays. The platelet releasate from a patient with gray platelet syndrome likewise failed to block IL-1 beta-induced nitrite release by smooth muscle cells. These results demonstrate that platelets downregulate the production of nitric oxide by IL-1 beta-treated vascular smooth muscle cells through the release of PDGF. This effect may represent a novel mechanism by which platelets regulate vasomotor tone and thrombus formation at sites of vascular injury. 相似文献
3.
Mosiagin BB Kalinina MA Buriakovskiĭ DL Zarkua NE 《Vestnik khirurgii imeni I. I. Grekova》2010,169(6):69-71
Results of relaparoscopy were analyzed in 42 patients with complications appearing after using 297 laparoscopic choledocholithotomies. Relaparotomies were classified according to the indications and terms from the main interventions. An analysis of complications after laparoscopic choledocholithotomy was made. The authors made a conclusion that relaparoscopy was an effective little-invasive method of diagnostics and correction of postoperative complications. 相似文献
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The article presents the investigational results of psychophysiological and social-and-psychological adaptation to military service in conditions of the European North of Russia in servicemen called up from different regions. During the first 6 months the positive dynamics concerning the communicative and personal adaptation potential and behavioral regulation was noted in all 239 servicemen. It was established that the representatives from northern region have lower potential possibilities of social-and-psychological adaptation to military service in the European North of Russia than the youths called up from other regions. Social-and-psychological adaptation to military service in the northern conditions was better than in the persons called up from the southern and central regions. The complete adaptation of servicemen at biological level wasn't observed. 相似文献
6.
Vanessa O Moreira Camila A Pereira Mirella O Silva Sergio L Felisbino Antonio C Cicogna Katashi Okoshi Flavio F Aragon Carlos R Padovani Marina P Okoshi Ana VB Castro 《Clinical and experimental pharmacology & physiology》2009,36(3):325-330
- 1 The role of growth hormone (GH) in cardiac remodelling and function in chronic and persistent pressure overload‐induced left ventricular hypertrophy has not been defined. The aim of the present study was to assess short‐term GH treatment on left ventricular function and remodelling in rats with chronic pressure overload‐induced hypertrophy.
- 2 Twenty‐six weeks after induction of ascending aortic stenosis (AAS), rats were treated with daily subcutaneous injections of recombinant human GH (1 mg/kg per day; AAS‐GH group) or saline (AAS‐P group) for 14 days. Sham‐operated animals served as controls. Left ventricular function was assessed by echocardiography before and after GH treatment. Myocardial fibrosis was evaluated by histological analysis.
- 3 Before GH treatment, AAS rats presented similar left ventricular function and structure. Treatment of rats with GH after the AAS procedure did not change bodyweight or heart weight, both of which were higher in the AAS groups than in the controls. After GH treatment, posterior wall shortening velocity (PWSV) was lower in the AAS‐P group than in the control group. However, in the AAS‐GH group, PWSV was between that in the control and AAS‐P groups and did not differ significantly from either group. Fractional collagen (% of total area) was significantly higher in the AAS‐P and AAS‐GH groups compared with control (10.34 ± 1.29, 4.44 ± 1.37 and 1.88 ± 0.88%, respectively; P < 0.05) and was higher still in the AAS‐P group compared with the AAS‐GH group.
- 4 The present study has shown that short‐term administration of GH to rats with chronic pressure overload‐induced left ventricular hypertrophy induces cardioprotection by attenuating myocardial fibrosis.
7.
A E Borisov L A Levin N A Borisova V S Verkhovski? V B Mosiagin S I Fa?nzi'lberg 《Vestnik khirurgii imeni I. I. Grekova》1989,142(6):21-25
The authors have performed 179 endovascular operations in 87 patients with complicated forms of cirrhosis of the liver using different successions of embolisation of the hepatic and splenic arteries, percutaneous transhepatic embolization of the gastric and esophageal veins, balloon occlusion of the vena cava inferior in combination with operations of the root vascular anastomoses (in 10 patients) and operations on the thoracic lymphatic duct. The complex and stepwise treatment of complications of cirrhosis by these methods resulted in an effective arrest of the ascites syndrome and lower portal pressure. 相似文献
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9.
VB Nyirongo MM Mukaka LV Kalilani-Phiri 《Malawi medical journal : the journal of Medical Association of Malawi》2008,20(1):15-18
In conducting and reporting of medical research, there are some common pitfalls in using statistical methodology which may result in invalid inferences being made. This paper is aimed to highlight to inexperienced statisticians or non-statistician some of the common statistical pitfalls encountered when using statistics to interpret data in medical research. We also comment on good practices to avoid these pitfalls. 相似文献
10.