经尿道气化术治疗浅表性膀胱肿瘤

为探讨经尿道气化术治疗浅表性膀胱肿瘤的临床效果，对1998年10月－2000年11月间26例浅表性膀胱肿瘤患者采用经尿道气化术进行治疗。26例均顺利完成手术操作，手术平均时间40min，术中均未输血，未发生膀胱穿孔及大出血。术后随访2－18个月,3例复发。结果表明，经尿道膀胱肿瘤气化术（TVBT）具有快速、出血少、手术并发症少等优点，疗效满意。     

脉冲激光烧蚀固体：从正常蒸发转变到相爆炸

本文系统地讨论了脉冲激光烧蚀固体材料时,随激光能量密度的增加,从正常蒸发转变到相爆炸的全过程。首先提出正常蒸发情况下的烧蚀模型,利用此模型,基于Ni靶材,得到激光的透射率随时间的演化规律,以及烧蚀厚度随激光能量密度的变化规律,将所得结果比实验值进行了详细地比较分析,发现我们的结果与实验值达到令人满意的吻合。其次,还讨论了脉冲激光烧蚀靶材时,随激光能量密度变化,烧蚀过程中将出现的亚表面加热,正常沸腾及相爆炸现象。     

汉英翻译中模糊美感磨蚀的成因

汉语言区别于西方印欧语系的根本之处在于它的模糊性。汉语言的模糊美感在音、形、意三方面体现得淋漓尽致。然而在汉英翻译过程中,译者无时无刻不在品味遗憾,而汉英翻译的最大遗憾莫过于汉语模糊美感在英译过程中的磨蚀。翻译过程中模糊美感磨蚀的成因主要来自英汉语法结构差异和意境营造失真两个方面。     

Effect of pretreatment with aspirin and ticlopidine on the change of platelet aggregability after radiofrequency catheter ablation

Eighty-two patients with supraventricular tachycardia undergoing radiofrequency catheter ablation (RFCA) were studied to observe the inhibition effect of aspirin and ticlopidine on platelet aggregability (PAG) and thromboxane B₂ (TXB₂) of the blood samples. Patients were divided into aspirin group A, ticlopidine group B, aspirin + ticlopidine group C and control group D. PAG and TXB₂ were increased clearly after RFCA in all groups (P<0.001). Treatment with aspirin or ticopidine before operation could reduce the platelet aggregability caused by RFCA and the joint effect of two drugs (change rate of group A: 52.51±12.51%; group B: 54.78±11.27%; group C: 30.51±10.59%; group D: 91.75±21.43%;P<0.05) was studied. The much decreased platelet aggregability after antiplatelet therapy was evidence of the potential benefit of the treatment in preventing thromboembolism after ablation. Pretreatment with aspirin and ticlopidine together is a good way to decrease palatelet aggregability after RFCA.     

真空退火对La_(0.7)Ca_(0.3)MnO_3外延薄膜输运特性的影响

在温度300-600℃及2×10-4-1×10-3Torr的氧压下,对脉冲激光烧蚀生成的La0.7Ca0.3MnO3(LCMO)薄膜进行退火.无论是经原位或异位退火处理后的LCMO薄膜,其金属-半导体电阻-温度(R-T)特性曲线及转变温度均会发生明显的改变.薄膜氧含量对其输运特性有突出的影响.     

Renal insufficiency is an independent predictor of in-hospital mortality for patients with acute myocardial infarction receiving primary percutaneous coronary intervention

Objective:To investigate the relationship between renal function and clinical outcomes among patients with acute ST-segment elevation myocardial infarction (ASTEMI), who were treated with emergency percutaneous coronary intervention (PCI). Methods: 420 patients hospitalized in Peking University First Hospital, diagnosed with ASTEMI treated with emergency (PCI) from January 2001 to June 2011 were enrolled in this study. Estimated glomerular filtration rate (eGFR) was used as a measure of renal function. We compared the clinical parameters and outcomes between ASTEMI patients combined renal insufficiency and the patients with normal renal function. Results:There was a significant increase in the concentrations of fibrinogen and D-Dimer (P<0.05) and a much higher morbidity of diabetes mellitus in the group of patients with chronic kidney disease (CKD; eGFR<60 ml/(min·1.73 m2)) (P<0.01). CKD (eGFR<60 ml/(min·1.73 m2)) was an independent predictor of in-hospital mortality for patients hospitalized with ASTEMI receiving PCI therapy rapidly (P=0.032, odds ratio (OR) 4.159, 95% confidence interval (CI) 1.127-15.346). Conclusions:Renal insufficiency is an independent predictor of in-hospital mortality for patients hospitalized with ASTEMI treated with primary PCI.     

Ultrasound ablation of pulmonary veins for treatment of paroxysmal atrial fibrillation

INTRODUCTIONMostparoxysmalatrialfibrillationisactivatedbyatrialectopiesoriginatinginthepulmonaryveins.Severalresearchesdemonstratedthatal most 50 %offocalatrialfibrillationoriginatesintheleftsuperiorpulmonaryveinandabout3 0 %intherightsuperiorpulmonaryvei…     

Segmental radiofrequency ablation of pulmonary vein ostia for patients with refractory paroxysmal atrial fibrillation using multi-slice spiral computed tomography guidance

INTRODUCTION Pulmonary veins(PV)may play an importantrole in both the initiation and maintenance of parox-ysmal atrial fibrillation(AF)(Fynn and Kalman,2004).Curative treatment of patients with paroxys-mal AF is possible by radiofrequency ablation,mak-ing segmental or linear lesions around the ostia ofPVs using a3-dimentional mapping system(Carto)(Pappone et al.,2000;2001;Oral et al.,2003).Multi-slice spiral computed tomography(MSCT)could generate a3-dimentional image of left atrium…     

较高气压下激光烧蚀等离子体的动力学特性

建立一维半导体Ge的激光烧蚀模型,对波长为248nm,脉宽为17ns,峰值功率密度为4×108w/cm2的KrF脉冲激光在1000torr(1torr=133.32pa)氦气环境下烧蚀晶体Ge及产生等离子体的过程进行了数值模拟,并对计算结果进行分析比较.结果表明在惰性气体环境下,气压在1torr和1000torr之间变化对等离子体屏蔽现象的出现几乎不产生影响;背景气压的增大抑制了粒子的扩散,使等离子体的膨胀速度减小,限制了其膨胀的空间.     

Value of a new post-procedural intravascular ultrasound score in predicting target vessel revascularization after coronary drug-eluting stents implantation

Objective: There is no simple or feasible post-procedural intravascular ultrasound (IVUS) score to predict major adverse cardiac events (MACE) in patients undergoing drug-eluting stents (DES) implantation. The aim of this study is to validate a new IVUS score for predicting MACE. Methods: A total of 295 patients (with 322 lesions) were enrolled. IVUS score was calculated in each lesion based on five IVUS morphological characteristics: inflow/outflow disease, malapposition, underexpansion, tissue protrusion, and edge dissection (iMUTE score). We assigned two points to an underexpansion and one point for each presence of other factors. Patients were divided into low score (iMUTE score<2, n=137) and high score (iMUTE score≥2, n=158) groups. Results: At one year follow-up, a trend was seen in favor of the low iMUTE score group in MACE (3.65% vs. 10.10%; P=0.052), and there was more target vessel revascularization (TVR) in the high iMUTE score group compared with low score group (6.96% vs. 1.46%; P=0.044). Low iMUTE score was an independent predictor of freedom from TVR at one year (adjusted hazard ratio (HR) 0.5, 95% confidence interval (CI) 0.1–0.8; P=0.02). Conclusions: Post-procedural IVUS iMUTE scoring was simple and feasible in clinical practice, and can provide independent prognostic value for TVR in patients undergoing DES implantation.