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一种具有高信噪比的脉搏波光电传感器的研制 总被引:5,自引:0,他引:5
目的:探讨研制一种生理信号光电传感器。方法:利用光电传感器检测通过指端毛细血管后的光强度的变化,将光信号转换成电信号,再经过电信号1/V转换、放大、滤波处理。结果:获得了清晰稳定的指端容积脉搏波。结论:高信噪比的光电传感器可用作于临床监测和生理信号分析处理系统。 相似文献
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EffectofCaptoprilonAntithrombusFunctionofEndotheliumXIONGYi-li(熊一力);ZHAOHua-yue(赵华月)(DepartmentofMedicine,TongjiHospital,Tong... 相似文献
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The concave and convex rib-vertebral angle (RVA) at levels T2–T12 was measured on AP radiographs of 19 patients with right convex idiopathic thoracic scoliosis and 10 patients with major thoracic right convex neuromuscular scoliosis. The difference between the angles on the concave and the convex sides, the RVAD, was calculated. The RVAs were also measured on radiographs from three animal groups in which spinal curves had been induced experimentally in a variety of ways. Group 1 comprised 16 rabbits that had been subjected to selective electrostimulation of the latissimus dorsi, the erector spinae and the intercostal muscles. Group 2 comprised four dead rabbits whose spines had been subjected to manual bending. Group 3 comprised eight rabbits that had undergone mechanical elongation of one rib. In both the idiopathic and the neuromuscular group, the convex RVA was smaller than the concave RVA between levels T2 and T8, with a maximal difference between T4 to T5. From T9 to T12 the concave RVA was smaller than the convex. The RVA in relation to the scoliotic segment, i.e. the apex level of the curve and the two neighbouring vertebrae above and below this level, showed similar results. With increasing Cobb angle the RVADs increased linearly with the greatest difference at the second vertebra above the apex. In the three experimental groups the pattern of the RVADs between T6 to T12 was basically similar to the findings of the clinical study. From the results of these clinical and experimental studies, it is concluded that the typical pattern of the RVAs on the concave and convex sides seems to be independent of the underlying cause of the spinal curvature. It is likely that the RVADs result from a passive mechanical adaptation of the ribs to the lateral curvature of the spine. 相似文献
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Summary 24 model rabbits with femoral arterial thrombosis were divided into two grocps: the treatment group consisting of 12 rabbits
which received API0134. and the control group composed of another 12 rabbits. 2 hours after recanalization by urokinase thrombolysis, reocilusion
occurred only in 1/12 vessel (8%) with incomplete occlusion in the treated group, but in 8/12 (67%) with complete occlusion
in the control group as assessed by angiograsphy. Pathological examination of specimen taken 24 hours after thrombolysis showed
that 6/12 (50%) of the treated group gave the evidence of thrombus occlusion, and milder intimai injury and less adhered blood
cells than in the control group, 83% of which had thrombus occlusion. In comparision with the control group, the function
of platelet in the treated group demonstrated lower platelet aggregation rate (PAgR) and plasma thromboxane A2 (TXA2) level, higher prostacyclin (PGI2) and plasminogen activator (PA) activity as well as lower plasminogen activator inhibitor (PAI) activity. From the above
it may be concluded that the preventive effect of API0134 on reocclusion might be due to inhibition of platelets aggregation and promotion of fibrinolysis. 相似文献
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健侧颈7移位治疗臂丛神经根性撕脱伤最佳时间选择的实验研究 总被引:11,自引:7,他引:4
健侧颈7移位治疗臂丛神经根性撕脱伤手术分第一阶段(健侧颈7移位到移植神经),第二阶段(移植神经另一端移植修复患侧神经),二次手术间隔多少时间才能获得最好的神经再生?选用SD大鼠及健侧颈7移位的实验模型,按二次手术间隔时间的不同(0、1、2、3、4、8、16周)分成7组,在第二次术后12周,进行电生理测定肌张力恢复率及组织切片的形态学观察,结果证实二次手术最佳间隔时间为4~8周.此结果可提供临床参考. 相似文献
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气相色谱用于肠通透性监测的研究 总被引:1,自引:0,他引:1
作者采用国产气相色谱及9202微机数据处理系统,对临床患者和实验动物肠通透性改变进行监测。该方法以甘露醇(M)和乳果糖(L)为探针,用气相色谱检测尿中糖分泌率及L/M比值。结果显示,测定标准品M和L随进样量增加而呈线性改变,与国外学者报道一致。比较不同浓度进口与国产乳果糖,证明二者在研究肠通透性方面高度相关(r=0.99)。检测急性胰腺炎并发感染动物的尿标本,发现乳果糖大量排出,L/M值明显增加。作者认为,气相色谱为一行之有效的方法用于肠通透性监测,有助于临床上对内源性感染及脓毒症的早期诊断。 相似文献
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目的:探讨螺旋CT血管造影(Spiral CT angiography,SCTA)技术,以期提高SCTA造影的质量。材料与方法:采用Somatom Plus 4螺旋CT扫描系统对10例病人行腹部SCTA检查。扫描技术和造影剂参数按病变范围和性质而定,三维重建采用最大强度投影法(MIP)或表面阴影显示法(SSD)或弯曲平面重建法(CPR)。结果:SCTA检查技术能可靠地显示血管形态和病变,评价腹部肿瘤与邻近血管关系。结论:SCTA是无创伤性的血管成像术,在很大范围可替代创伤性的血管造影。 相似文献