Accurate operation and installation circumstance of medical instruments and equipment directly affect their normal operation. Breakdown of medical instrument due to wrong operation accounts for 43% of all failures. This article makes a discussion on how to train staffs before operation,register utilization and maintenance,manage equipment by dedicated person and mak the best use of medical instrument.

OBJECTIVE:To evaluate and compare the current preparation methods for pseudo-ternary phase diagrams of pharmaceutical microemulsions.METHODS:Pseudo-ternary phase diagrams were prepared by using Tween-80,OP and lecithin as emulsifiers respectively,alcohol as assistant emulsifiers,isopropyl myristate or aethylis oleas as the oil phase,the difference in phase diagrams obtained with different preparation methods was compared with regard to the accuracy and au-thenticity of valid point.RESULTS:To O/W surfactant,difference in the area of phase diagrams was small,but the dis-tinction of accuracy and authenticity of valid point was great.To W/O surfactant,difference in the area of phase diagrams was great.CONCLUSION:It is recommended to select the preparation method according to the characteristics of the constituents and the types of microemulsions in order to establish accurate and dependable phase diagram,the end point of titration should be judged comprehensively.

Objective To construct a EGFP-labled recombinant plasmid of VEGF165 (vascular endothelial growth factor) gene, and to study the transfection and expression of VEGF165 eukaryotic expression plasmid in mesenchymal stem cells (MSCs). Methods pIRES2-EGFP-VEGF165 recombinant plasmid was constructed, which was then transfected into rat MSCs. ELISA and MTT were used to detect the expression level and biological activity of VEGF in the conditioned medium after transfection. Results There was a significant increase in VEGF protein in the MSCs after being transfected with pIRES2-EGFP-VEGF165. The conditioned medium after transfection showed the biological activity of stimulating the proliferation of endothelial cells. Conclusions The pIRES2-EGFP-VEGF165, a eukaryotic expression plasmid for VEGF165 gene, is constructed. High levels of VEGF protein expression can be obtained in the MSCs transfected with pIRES2-EGFP-VEGF165. The expressed protein has the biological activity of VEGF.

Objective To evaluate the possibility and efficiency of nanoparticles as a new vector in vascular endothelial growth factor (VEGF) gene transfection. Methods Nanoparticle-VEGF (Np/VEGF)complex was prepared with poly (D, L-lactide-co-glycolide) (PLGA) loading VEGF165 gene using the multiple emulsion (w/o/w) technique. The envelopment efficiency and size of the complex were determined. Rat myocardial cells were cultured in vitro, and the Np/VEGF was transfected into the cultured myocardial cells. Then RT-PCR and ELISA were used to evaluate whether the Np/VEGF increased the level of gene expression. Four New Zealand rabbits were used, the suspension of Np/VEGF was injected into myocardial tissue of rabbits after thoracotomy. 96h after the operation, the tissue sections of the implant sites were observed with transmission electron microscope (TEM) to determine the process of nanoparticles as vectors for gene transfer to cardiac myocytes. Results The envelopment efficiency and size of the Np/VEGF complex thus prepared were 1.87% and 25-300nm respectively. RT-PCR and ELISA showed that VEGF gene could be successfully transfected into myocardial cells by nanoparticle, and NP/VEGF significantly enhanced gene transfection efficiency, and it was more effective than plasmid. 96h after the operation, a great number of nanoparticles were observed in myocardial cytoplasm and nucleus with TEM, and many nanoparticles began to dissolve and degrade, suggesting that the DNA was released slowly from the nanoparticles localized in the cytoplasmic compartment, and was then transferred into the nucleus. Conclusions NP/VEGF can act as a vector to transfect VEGF gene in vitro and in vivo, it significantly enhanced gene transfection efficiency, and it was more effective than plasmid.

Objective To study the platelet activity changes in patients before and after percutaneous coronary cutting balloon angioplasty (CBA) and plain old balloon angioplasty (POBA) as well as its clinical significance.Methods Blood was obtained from the coronary sinus. Bioassay method used for assessment of PDGF. The plasma 6-keto-PGF 1a level was determined using ELISA.Results The amount of PDGF and 6-keto-PGF 1a were significantly different after PTCA between CBA group and POBA group (P

Objective To study the parameters of the postprandial plasma lipoproteins metabolism and the platelet activity change in the elderly patients with coronary heart disease(CHD). Methods 48 elderly patients with CHD (CHD group) and 30 healthy elderly subjects (control group) were enrolled in this study. The levels of plasma lipoproteins including TG, CH, LDL-C and HDL-C, plama PDGF bioactivity, and vWF plasma concentration were measured at 12 hours after fasting and 4 hours after a fat-rich meal. Results The plasma levels of pre-prandial and postprandial TG, CH, LDL-C, PDGF and vWF in the CHD group were significantly higher than those in the control group, while plasma HLD-C level in the CHD group was significantly lower than that in the control group. Compared with fasting state, the levels of plasma TG, CH and LDL-C in the postprandial state significantly increased, but plasma HDL-C level did not significantly decreased. The plasm PDGF and vWF values of CHD group in the postprandial state significantly elevated. Conclusion These data suggested that the plasma lipoproteins metabolism of the elderly patients with CHD was abnormal, and the platelets activation in the elderly patients with CDH was correlated with the changes of postprandial plasma lipoproteins metabolism.

Objective To assess the time course of functional recovery after coronary intervention in patients with myocardial infarction. Methods 30 patients with myocardial infarction (left ventricular ejection fraction, LVEF

Objective To assess the short- and long-term results of patients with Takayasu arteritis underwent intervention therapy. Methods A total of 13 peripheral arteries in 10 consecutive patients with Takayasu disease were treated with percutaneous transluminal interventions. The target vessels included 2 subclavian arteries, 5 renal arteries, 1 abdominal artery, lcarotid artery, 1 lilac artery, and 3 pulmonary arteries. Nine stents were implanted in 8 patients for suboptimal results or dissection. Results Angioplasty and stenting were successful in all attempted lesions. Diameter stenosis was reduced from (90?11)% to (11?12)% ( P

Objective To evaluate the safety, efficacy and short term results of cutting balloon (CB) coronary angioplasty Methods CB angioplasty was performed on 116 lesions in 102 patients (male 90%, age 57 5?11 2 years) Results The overall success rates of the primary cutting balloon angioplasty without predilatation were 94% Combined with small conventional balloon predilatation improves the procedural success rate to 97% 16 cases of in stent restenosis were also treated with CB successfully 72 lesions were treated with CB followed by stents insertion In 44 lesions treated with the CB alone, there was a marked reduction in the luminal stenosis from (80 9?11 6)% to (11 6?5 9)% One patient developed cardial tamponade 3 hours after CB angioplasty, which was resolved with pericardiocentesis One case developed severe dissection after CB angioplasty No abrupt coronary closure, emergency bypass surgery and acute myocardial infarction occurred 10 (9 8 %)patients experienced angina pectoris during 1 to 20 months (average 11 2 months) follow up, there were no further cardiac events in other patients 3 cases of angiographic restenosis were confirmed in 12 patients who underwent follow up angiography Conclusion CB angioplasty is a safe and efficient technique with a high success rate and satisfactory short term results

Objective To observe the effects of constant magnetic fields (CMF) on angiotensinⅡ (AngⅡ)-stimulated proliferation of human umbilical arterial vascular smooth muscle cells (VSMC). Methods The experimental proliferation models of cultured human umbilical arterial VSMC stimulated with AngⅡ was establishea. The VSMC were cultured under 1 and 5 mT CMF for 48 hrs. Proliferation of the VSMC was detected by MTT and 3H-TdR incorporation method (A-value and cpm-value), and cell cycle was analyzed by flow cytometry. Results The CMF of 1 and 5 mT may antagonize proliferation of VSMC stimulated with AngⅡ, and hold-back VSMC from static phase (G 0/G 1)to DNA synthetic (S) and mitotic phase (G 2/M). Conclusion The study demonstrates that CMF of 1 and 5 mT can significantly inhibit the human VSMC proliferation.