The detection of blood flow velocity has great significance for blood vessel monitoring and the research of cardiovascular pathogenesis. Blood flow velocity measurement based on ultrasonic is becoming more and more popular in doctors and patients compare to several other techniques in nowadays, as they are non-invasive, cheap and fast. Most of the traditional ultrasonic blood flow velocity measurement methods are based on the Doppler frequency shift, but theses methods have some limitations, such as angle dependence, limited spatial resolution and so on. Therefore, blood flow velocity techniques based on non-Doppler frequency shift also get rapid development in recent years. This article mainly summarizes the techniques of blood flow velocity estimation based on ultrasonic in these two aspects.
Blood Flow Velocity ; Humans ; Ultrasonography

BACKGROUND: Cervical orthosis is one of the non-surgical therapeutic methods for the remedy of cervical deformities. The introduction of cervical orthosis into the clinical remedy of cervical deformities resulted by burn can maximally restore the cervical function of the patients.OBJECTIVE: To analyse the clinical applicative mode and the effects of moulded cervical orthosis (MCO) on cervical burn.DESIGN: A before-and-after verification study by employing pateitns as subjects.SETTING: Prosthetics and orthotic department in a provincial artificial limb center.PARTICIPANTS: Totally 19 cases including 13 males and 6 females after skin-transplantation due to serious burn in head, neck and chest admitted by the outpatient department of prosthetics center between January and September 2003.METHODS: Nineteen patients with cervical burn wore MCO. Return visits were made afterwards for the evaluation of the treatment effects of MCO.MAIN OUTCOME MEASURES: Resutls of therapeutic effectiveness evaluation.RESULTS: All nineteen patients with cervical deformities due to burn reached the effects of correcting cervical flexion and restoring cervical functions through wearing orthosis. The cervical functions restored entirely in seven cases, almost restored in eight cases and improved in four cases.CONCLUSION: MCO can be clinically used on cervical deformities resulted by burn and provide good effects on remedy and rehabilitation.

Objective To determine wherher acarbose could decrease the risk of recurrent stroke in impaired glucose tolerance(IGT)patients with ischemic stroke.Methods Four hundred and sixteen patients with transient ischemic attack(TIA)or minor ischemic stroke were selected into this trial and participated 75g oral glucose tolerance test(OGTT)1 month after their diagnosis and recovery of the disease.One hundred and nineteen IGT patients were randomly divided into two groups.Patients in pharmaceutical intervention group were treated with acarhose while those in the observation group were not.Seventy patients were selected randomly in those patients without IGT(control group).All patients of the three groups were administered low dose aspirin.Results During 3 years follow-up,8 patients (13.33%)experienced a stroke in pharmaceutical intervention group.The risk of recurrent stroke was decreased significantly compared with that in observation group(P＜0.05),and there Was no significant difference between pharmaceutical intervention group and control group (P＞0.05). Conclusion Acarbose can degrade the risk of recurrent stroke in IGT patients with ischemic stroke.

Purpose To investigate the effects and the mechanism of oleum curcumae wenchowensis (OCW) with different concentrations (0, 2.5, 5, 10 and 20 mg/mL) on chronic myeloid leukemia cell line K-562 cells in vitro.Methods The apoptosis of K-562 cells was dyed by Hoechest 33258 and detected by flow cytometry marked with Annexin V/PI. The Expression of Fas/FasL, bcr/abl, bcl-2 and p53 was detected by semi-quantity reverse transcript-polymerase chain reaction (RT-PCR) and Western blot.Results The results showed that the apoptosis rates were gradually elevated. The expression of Fas and FasL protein was increased in a concentration dependent manner, while bcr/abl, bcl-2 and p53 had no significant changes.Conclusion OCW could induce the apoptosis of K-562 cells by up-regulating the expression of Fas/FasL protein.

OBJECTIVE To observe the effects of Dexamethasone on the expression of cyclic nucleotide-gated channels (CNG channels) mRNA of olfactory receptor neurons (ORNs) by real-time quantitative reverse transcription-polymerase chain reaction(RT-PCR). METHODS Forty Wistar rats were randomly divided into four groups: 24-hours Dexamethasone treated group and its control group; 2-weeks Dexamethasone treated group and its control group. Dexamethasone was injected i.p. (1 mg/kg for 24-hours group, 0.2 mg/d for 2-weeks group). Control group rats were injected with the same volume of normal saline. Real-time quantitative RT-PCR was performed to evaluate mRNA production of CNGA2 subunits. RESULTS In Dexamethasone-injected rats, the up-regulation of CNGA2 mRNA was observed in 2-weeks group(P

Objective To investigate the differences of protein and mRNA expression of matrix metalloproteinase 9 (MMP-9) in osteoclasts (OC) and osteoclast-like cells (OLC) obtained by mechanical and inducement methods. Methods Mechanical separation method was used to separate mature osteoclasts from long bones of SD rats aged one-day;and inducement culture method was applied to induce OLC by using RANKL (100 ng/mL) and M-CSF (100 ng/mL) . The protein expression of MMP-9 was measured by immunocytochemistry and mRNA expression of MMP-9 was assayed by in situ hybridization. Results The integral optical density (IOD) and average optical density (AOD) of positive cells in the visual field were higher in the 12-d group of inducement method as compared with the 3 d-group of mechanical method. Conclusions It is suggested that the protein and mRNA expression of MMP-9 in OLC obtained by 12 d inducement method is much high than in OC obtained by 3 d mechanical method. OLC obtained by inducement method can be applied in the study of osteoporosis.

AIM: To evaluate expression of the components of endothelin system in pulmonary tissue in a canine pacing-induced congestive heart failure model. METHODS: Twenty-one dogs were divided into 3 groups received 2 (pacing 2 group) or 4 weeks (pacing 4 group) rapid right ventricular pacing, respectively, whereas the other group consisted of 7 dogs received sham-operation as control group. Haemodynamic parameters were detected via left and right heart catheterization. Plasma endothelin-1 was determined by means of RIA. In addition, RT-PCR was used to quantify expression of mRNA of components of endothelin system using ?-actin as internal control. One-way ANOVA and linear regression analysis were used for statistical study. RESULTS:Plasma endothelin-1 increased significantly in heart failure animals. The ratio of preproET-1 to ? actin mRNA was significantly increased from 0.14?0.06 in control group to 0.35?0.08 in pacing 2 group and 0.53?0.08 in pacing 4 group ( P

Objective To assess the safety and efficacy of extended liver resection using preoperative PTCD (percutaneous transhepatic cholangial drainage) and PVE (portal vein embolization) to treat patients with locally advanced hilar cholangiocarcinoma.Methods We collected and analyzed the clinical data of 27 patients with Bismuth types Ⅲ and Ⅳ hilar cholangiocarcinoma who underwent extended hepatecomy using preoperative PTCD and PVE in our hospital.Results There were 21 patients with R0 resection and 6 patients with R1 resection.The mortality rate was 0％.Eight patients died of cancer recurrence.Conclusion Preoperative PTCD and PVE combined with extended hepatectomy were safe and efficacious in treating patients with locally advanced hilar cholangiocarcinoma,which resulted in potential cure.

AIM: To investigate the changes of intrarenal endothelin system in the course of congestive heart failure. METHODS: A canine congestive heart failure model induced by rapid right ventricular pacing was used in the present study. Twenty-one mongrel dogs divided randomly into 3 groups: control, congestive heart failure 2 weeks(CHF2) and congestive heart failure 4 weeks (CHF4). The severity of heart failure was evaluated by means of hemodynamic measurement. The concentration of plasma endothelin was detected via RIA, and the expression of endothelin was detected by RT-PCR. RESULTS: The concentration of plasma endothelin in both of CHF2 and CHF4 elevated significantly. In CHF2, the expression of endothelin receptor B(ETB) in renal medulla increased significantly. And in CHF4, the expression of preproendothelin, endothelin receptor A(ETA) and ETB increased both in renal cortex and medulla. Furthermore, in cortex, the expression of ETA increased more significantly than ETB, while in medulla, ETB expressed much more than ETA. CONCLUSION: The changes of renal endothelin system expression plays a role in the regulation of water and electrolyte balance during the progress of congestive heart failure.

Objective_To study the effect of Y-27632 on invasion and motility of SGC-7901 gastric carcinoma cells, and to find whether Y-27632 excerts the effect by attenuating SRF expression.Methods_SGC-7901 gastric carcinoma cells were divided into 3 groups:1)blank control group;2)Y-27632 group;3)siRNA-SRF-1107 group. Transfected siRNA-SRF or incubated by Y-27632 48 h.The effect of Y-27632 on proliferation suppressions of SGC-7901 gastric carcinoma cells was detected by CCK-8 assay.Cell invasion was examined by Transwell and wound healing test.The expression of SRF, ROCK1, E-cadherin, β-catenin, F-actin, MRTF-A and Cyclin D1 were detected by Western blot.Results_Y-27632 inhibited invasion (P<0.05)but had no effect on proliferation of SGC-7901 gastric carcinoma cells.Y-27632 reduced ROCK1, MRTF-A, F-actin, SRF protein expressions by 37.0%, 44.3%, 62.7%and 62.7%respectively, and E-cadherin protein expression was up-regulated by 2.64 folds(P<0.05).Conclusions_The inhibition of ROCK and up-regulation of E-cadherin by Y-27632 can inhibit the invasion and migration of SGC-7901 gastric carcinoma cells that is explained at least, in part, by attenuating SRF expression.