Prospective trial of electroanatomically guided, irrigated catheter ablation of atrial tachycardia in patients with congenital heart disease

BACKGROUND: Ablation success rates reported for atrial tachycardia (AT) patients with congenital heart disease (CHD) is lower than the rates reported for other varieties of supraventricular tachycardia. Retrospective studies suggest these rates might be increased by the use of irrigated radiofrequency (RF) ablation. OBJECTIVES: The purpose of this study was to determine whether irrigated RF ablation increases ablation success rates in patients with CHD and AT. METHODS: Patients were studied in a prospective, randomized, nonblinded manner. The operator was limited to use of randomized therapy (standard or irrigated ablation) for the first 6 minutes of RF application to each targeted arrhythmia. Lesion characteristics were recorded, and acute ablation success was ascertained. Structured clinical follow-up was performed over a 6-month period. RESULTS: Forty-seven ATs were targeted in 26 patients; 72% of these ATs were ablated. Within the 6-minute randomization period, no difference in success rates of standard and irrigated catheters was noted. However, crossover from standard to irrigated ablation more likely was successful than vice versa (irrigated: 8 successes/8 attempts vs standard: 1 success/4 attempts, P = .018), and overall success was greater using irrigated catheters (66% vs 33%, P = .019). Mean delivered power was slightly higher in irrigated lesions (32.5 W vs 30.2 W, P = .025), and mean temperature was much lower (33.5 degrees C vs 59.3 degrees C, P < .001). A composite AT intensity score was significantly reduced compared with preablation values at 6-month follow-up of all patients. CONCLUSIONS: Ablation of ATs in patients with CHD results in symptomatic improvement over short-term follow-up. Irrigated ablation may result in higher acute success rates in these patients.     

老年睡眠呼吸暂停综合征与糖尿病关系的流行病学调查

目的调查老年人睡眠呼吸暂停综合征(SAS)与2型糖尿病(T2DM)的关系。方法对3286例老年人,采用家访式问卷调查,其中男1824人,女1462人,年龄60~92岁,平均(69±8)岁。随机抽样628人进行多导睡眠仪检查。结果3286例老年人群中SAS患者为959人(29.2%);糖尿病105例(3.2%),其中SAS组84例(8.8%),无SAS组为21例(0.9%),2组比较差异显著(P<0.01)。Logistic多元回归分析SAS是T2DM的独立危险因素(P<0.01)。结论本调查资料提示,老年人SAS患病率为29.2%。SAS组T2DM的发生率显著高于无SAS组,两者呈显著正相关关系。     

Effects of nerve growth factor on brain glutathione-related enzymes from aged rats

Summary— Neurotrophins, like the nerve growth factor (NGF), trigger a variety of biological effects in their targets. Stimulating effects on antioxidant defenses have been postulated to underlie neurotrophic influence on neuron survival and maintenance. To test whether NGF is capable of inducing changes in glutathione-related enzymes in the aged cognitively impaired brain, glutathione reductase (GRD), glutathione S-transferase (GST) and total glutathione peroxidase (GPX) activities were measured in the striatum, septum, hippocampus and frontal cortex of four Sprague-Dawley rat groups: young (2 months old), aged (20 months old) untreated, aged cytochrome c-treated, and aged NGF-treated (icv delivery, 34 4mUg during 28 days). All the aged rats utilized in the study were memory impaired according to their performance in the Morris water maze test. These aged rats showed increases in the activities of septal and hippocampal GST, as well as, in the hippocampal, striatal and cortical GPX. These increases could be interpreted as compensatory responses to cope with the oxidative damage that has been accumulated by the aged brain. The increases in hippocampal and cortical GPX activity were attenuated by NGF treatment, whereas the neurotrophin induced an increase in GRD activity in the striatum of aged rats. These results point out GRD and GPX as possible targets of the neurotrophic effects.     

药用矿物蒙脱石的X-射线定向衍射分析

目的：揭示蒙脱石层状晶体结构及层间吸附和膨胀性能，为其作为药物和药剂辅料提供科学依据。方法：将样品提纯，获得粒径小于1μm的胶体，制成取向样品，进行X－射线定向衍射分析。结果：得到了有关蒙脱石层间域在不同条件下的变化规律。结论：蒙脱石的层间吸附是可能的，而且定向衍射方法可以定量测定其层间距离。     

化学信息修饰法及其在复杂混合物分析中的应用

目的:提出一种未知干扰共存下复杂混合物快速定量分析的新方法.方法:对待测未知干扰共存混合物体系的化学信息进行原位数学修饰,使其符合导数光谱法数学模型的匹配要求,去除未知干扰对测定的影响.结果:测定未知干扰共存下安钠咖注射液中苯甲酸钠的含量,平均回收率100.1％,RSD=2.5％(n=4).结论:运用数学手段改造待测复杂混合物的化学信息特征,使其符合指定解析方法数学模型的匹配要求,可以成功应用于未知干扰共存下复杂混合物的快速定量分析.