目的:探讨左心房低电压区与心房颤动(房颤)导管消融术后复发的相关性。方法:系统检索建库至2020年9月3日PubMed、Embase、Cochrane Library、Web of Science、维普、中国知网、万方数据库及中国生物医学文献数据库关于左心房低电压区与...目的:探讨左心房低电压区与心房颤动(房颤)导管消融术后复发的相关性。方法:系统检索建库至2020年9月3日PubMed、Embase、Cochrane Library、Web of Science、维普、中国知网、万方数据库及中国生物医学文献数据库关于左心房低电压区与房颤导管消融术后复发相关性的研究。应用RevMan5.3软件制作森林图,应用Stata 12.0软件进行发表偏倚检验。结果:共纳入11项研究1832例房颤患者,平均年龄59.6岁,随访期间共441例复发。Meta分析结果显示左心房低电压区可显著增加房颤患者导管消融术后的复发风险(HR=2.13,95%CI:1.59~2.86)。结论:左心房低电压区与房颤导管消融术后的复发显著相关。展开更多
目的探讨不同节律下心房颤动(简称房颤)患者电解剖标测心房低电压区(low voltage areas,LVAs)的特征及意义,并分析单纯肺静脉隔离(pulmonary vein isolation,PVI)术对LVAs的影响。方法连续纳入首次接受射频消融治疗的84例房颤患者,其中4...目的探讨不同节律下心房颤动(简称房颤)患者电解剖标测心房低电压区(low voltage areas,LVAs)的特征及意义,并分析单纯肺静脉隔离(pulmonary vein isolation,PVI)术对LVAs的影响。方法连续纳入首次接受射频消融治疗的84例房颤患者,其中49例阵发性房颤,35例持续性房颤,使用倾向性评分进行匹配。在0.5 mV的阈值下测量心房五分区后各区域LVAs的面积并进行分析。结果根据年龄、性别、BMI,采用倾向性评分匹配出31组患者。阵发性房颤患者术前平均标测点数为(1434.2±393.6)个,术后为(1281.3±372.7)个;持续性房颤患者术前平均标测点数为(1652.6±728.2)个,术后为(1314.6±690.8)个。在所有研究对象中,均可记录到LVAs的存在。阵发性房颤患者术前术后LVAs面积比较,差异无统计学意义;持续性房颤患者LVAs面积术后明显下降(P<0.05)。在所有84例房颤患者中,LVAs出现在前壁、间隔、下壁、侧壁和后壁的比例分别为69.0%、95.2%、82.1%、60.7%和52.4%。结论在相同的电压阈值下,持续性房颤患者LVAs面积在房颤节律下明显大于窦性节律下,单纯PVI术对LVAs影响不大。房颤患者中LVAs好发于前壁、间隔及下壁。展开更多
目的:探讨房颤患者血清CCN5水平是否可以预测左房低电压面积(LVZ)的大小。方法:选取2023年6月到2024年1月于烟台毓璜顶医院就诊的窦性心律患者(对照组) 79例以及首次接受心脏射频消融术的房颤患者(房颤组)114例。收集一般资料、生化、...目的:探讨房颤患者血清CCN5水平是否可以预测左房低电压面积(LVZ)的大小。方法:选取2023年6月到2024年1月于烟台毓璜顶医院就诊的窦性心律患者(对照组) 79例以及首次接受心脏射频消融术的房颤患者(房颤组)114例。收集一般资料、生化、心电图、心脏超声等临床资料。按术中行基质电压标测所得的LVZ是否大于6%将患者分为A组(LVZ Objective: To explore whether the serum CCN5 levels associated with atrial fibrosis can predict LVZ in patients with atrial fibrillation. Methods: In this study, 79 patients with sinus rhythm (control group) and 114 patients with atrial fibrillation (atrial fibrillation group) who received radiofrequency cardiac ablation for the first time in Yantai Yuhuangding Hospital between June 2023 and January 2024 were enrolled. General data, biochemistry, electrocardiogram, cardiac ultrasound and other clinical data were collected. Left atrial stroma voltage mapping was performed in patients with atrial fibrillation and LVZ area ratio was calculated. Patients were divided into group A (LVZ < 6%) and group B (LVZ ≥ 6%) according to whether LVZ was greater than 6%. The expression level of CCN5 in peripheral blood was measured by enzyme-linked immunosorbent assay. T test was used to compare the CCN5 expression level between the control group and the atrial fibrillation group. Pearson or Spearman correlation analysis was used to explore the correlation between CCN5 and clinical data. Binary Logistic regression analysis was used to determine the risk factors affecting the LVZ, and receiver operating characteristic (ROC) analysis was down to determine the cut-off value of CCN5 to predict LVZ. Results: The level of CCN5 in patients with atrial fibrillation was lower than in control group (32.43 ± 6.15 vs. 25.46 ± 4.97, P < 0.001). For atrial fibrillation patients with LVZ < 6%, blood CCN5 expression levels were lower in patients with LVZ ≥ 6% (30.10 ± 6.75 vs. 24.75 ± 3.49, P < 0.001). In patients with atrial fibrillation, CCN5 was negatively correlated with BNP level, left atrial diameter and left atrial low-voltage area ratio (P < 0.05). Logistic regression analysis suggested that blood CCN5 level was an independent risk factor for LVZ. ROC curve showed that in patients with atrial fibrillation, the optimal blood concentration of CCN5 to predict LVZ ≥ 6% was 27.22 ng/ml, sensitivity was 0.707, specificity was 0.773, and area under the curve was 0.785 [P < 0.001, CI: (0.696, 0.873)]. Conclusion: Serum CCN5 can independently predict the proportion of left atrial low-voltage area in patients with atrial fibrillation.展开更多
To minimize the power consumption with resources operating at multiple voltages a time-constrained algorithm is presented.The input to the scheme is an unscheduled data flow graph (DFG),and timing or resource constrai...To minimize the power consumption with resources operating at multiple voltages a time-constrained algorithm is presented.The input to the scheme is an unscheduled data flow graph (DFG),and timing or resource constraints.Partitioning is considered with scheduling in the proposed algorithm as multiple voltage design can lead to an increase in interconnection complexity at layout level.That is,in the proposed algorithm power consumption is first reduced by the scheduling step,and then the partitioning step takes over to decrease the interconnection complexity.The time-constrained algorithm has time complexity of O(n 2),where n is the number of nodes in the DFG.Experiments with a number of DSP benchmarks show that the proposed algorithm achieves the power reduction under timing constraints by an average of 46 5%.展开更多
There is a danger of power generation efficiency decreasing due to voltage increase when clustered residential PV systems are grid-interconnected to a single distribution line. As a countermeasure, installation of the...There is a danger of power generation efficiency decreasing due to voltage increase when clustered residential PV systems are grid-interconnected to a single distribution line. As a countermeasure, installation of the reactive power control of an inverter at each residence has been considered. However, there are not many types of inverters that can operate reactive power control because there are insufficient effects on a low voltage distribution line with low penetration PV with reactive power control. Therefore, it is necessary to consider how to increase generation efficiency with a lower number of inverters. In this paper, four Japanese standard distribution line structures, for example of a residential area on ＂C1＂, where 2,160 residential PV systems are grid-interconnected, are selected. The optimal setting of reactive power control at each residence is computed on the distribution lines with a greedy method.展开更多
文摘目的:探讨左心房低电压区与心房颤动(房颤)导管消融术后复发的相关性。方法:系统检索建库至2020年9月3日PubMed、Embase、Cochrane Library、Web of Science、维普、中国知网、万方数据库及中国生物医学文献数据库关于左心房低电压区与房颤导管消融术后复发相关性的研究。应用RevMan5.3软件制作森林图,应用Stata 12.0软件进行发表偏倚检验。结果:共纳入11项研究1832例房颤患者,平均年龄59.6岁,随访期间共441例复发。Meta分析结果显示左心房低电压区可显著增加房颤患者导管消融术后的复发风险(HR=2.13,95%CI:1.59~2.86)。结论:左心房低电压区与房颤导管消融术后的复发显著相关。
文摘目的:探讨房颤患者血清CCN5水平是否可以预测左房低电压面积(LVZ)的大小。方法:选取2023年6月到2024年1月于烟台毓璜顶医院就诊的窦性心律患者(对照组) 79例以及首次接受心脏射频消融术的房颤患者(房颤组)114例。收集一般资料、生化、心电图、心脏超声等临床资料。按术中行基质电压标测所得的LVZ是否大于6%将患者分为A组(LVZ Objective: To explore whether the serum CCN5 levels associated with atrial fibrosis can predict LVZ in patients with atrial fibrillation. Methods: In this study, 79 patients with sinus rhythm (control group) and 114 patients with atrial fibrillation (atrial fibrillation group) who received radiofrequency cardiac ablation for the first time in Yantai Yuhuangding Hospital between June 2023 and January 2024 were enrolled. General data, biochemistry, electrocardiogram, cardiac ultrasound and other clinical data were collected. Left atrial stroma voltage mapping was performed in patients with atrial fibrillation and LVZ area ratio was calculated. Patients were divided into group A (LVZ < 6%) and group B (LVZ ≥ 6%) according to whether LVZ was greater than 6%. The expression level of CCN5 in peripheral blood was measured by enzyme-linked immunosorbent assay. T test was used to compare the CCN5 expression level between the control group and the atrial fibrillation group. Pearson or Spearman correlation analysis was used to explore the correlation between CCN5 and clinical data. Binary Logistic regression analysis was used to determine the risk factors affecting the LVZ, and receiver operating characteristic (ROC) analysis was down to determine the cut-off value of CCN5 to predict LVZ. Results: The level of CCN5 in patients with atrial fibrillation was lower than in control group (32.43 ± 6.15 vs. 25.46 ± 4.97, P < 0.001). For atrial fibrillation patients with LVZ < 6%, blood CCN5 expression levels were lower in patients with LVZ ≥ 6% (30.10 ± 6.75 vs. 24.75 ± 3.49, P < 0.001). In patients with atrial fibrillation, CCN5 was negatively correlated with BNP level, left atrial diameter and left atrial low-voltage area ratio (P < 0.05). Logistic regression analysis suggested that blood CCN5 level was an independent risk factor for LVZ. ROC curve showed that in patients with atrial fibrillation, the optimal blood concentration of CCN5 to predict LVZ ≥ 6% was 27.22 ng/ml, sensitivity was 0.707, specificity was 0.773, and area under the curve was 0.785 [P < 0.001, CI: (0.696, 0.873)]. Conclusion: Serum CCN5 can independently predict the proportion of left atrial low-voltage area in patients with atrial fibrillation.
文摘To minimize the power consumption with resources operating at multiple voltages a time-constrained algorithm is presented.The input to the scheme is an unscheduled data flow graph (DFG),and timing or resource constraints.Partitioning is considered with scheduling in the proposed algorithm as multiple voltage design can lead to an increase in interconnection complexity at layout level.That is,in the proposed algorithm power consumption is first reduced by the scheduling step,and then the partitioning step takes over to decrease the interconnection complexity.The time-constrained algorithm has time complexity of O(n 2),where n is the number of nodes in the DFG.Experiments with a number of DSP benchmarks show that the proposed algorithm achieves the power reduction under timing constraints by an average of 46 5%.
文摘There is a danger of power generation efficiency decreasing due to voltage increase when clustered residential PV systems are grid-interconnected to a single distribution line. As a countermeasure, installation of the reactive power control of an inverter at each residence has been considered. However, there are not many types of inverters that can operate reactive power control because there are insufficient effects on a low voltage distribution line with low penetration PV with reactive power control. Therefore, it is necessary to consider how to increase generation efficiency with a lower number of inverters. In this paper, four Japanese standard distribution line structures, for example of a residential area on ＂C1＂, where 2,160 residential PV systems are grid-interconnected, are selected. The optimal setting of reactive power control at each residence is computed on the distribution lines with a greedy method.
