upgrade

升级
  • 文章类型: Journal Article
    污水处理厂(WWTP)是温室气体(GHG)排放的最大来源之一,它们也是城市系统中最大的能源消耗行业之一。随着升级和标准的提高,污水处理厂直接和间接地增加了对电力和化学试剂的设施和使用的投资。这里,我们收集了华北子牙河流域关键控制区的15个污水处理厂的运行数据,并说明了不同技术升级方法下碳性能的变化。结果表明,升级后的平均碳排放性能提高了0.487kgCO2/m3。电力消耗产生的碳排放,化学品使用,生化工艺和污泥处理占42%,17%,24%,碳排放绩效总改善的17%,分别。降低能耗,调节化学品使用和污泥综合利用是碳减排的关键。进一步提出制定污水处理排放标准应充分考虑水质分类的综合利用。自然条件有利的地区要充分利用自身优势,采取经济可行的方式,低能耗技术,如人工湿地,提供碳封存和景观美化的好处。本研究为污水处理行业减污减碳技术路径选择和实现水资源可持续利用提供了指导。
    Wastewater treatment plants (WWTPs) are one of the largest sources of greenhouse gas (GHG) emissions, and they are also one of the largest energy consumption industries in urban systems. With the progression of upgrading and standard-rising, WWTPs both directly and indirectly increase carbon emissions from the increased investments in facilities and usages in electricity as well as chemical agents. Here, we collected operational data from 15 WWTPs in the key control areas of the Ziya River Basin in North China and accounted for the changes in carbon performance at different technical upgrade methods. Results showed that the average carbon emission performance increased by 0.487 kg CO2/m3 after the upgrade. Carbon emissions from electricity consumption, chemical usage, biochemical process and sludge treatment accounted for 42%, 17%, 24%, and 17% of the total improvement in carbon emission performance, respectively. Reducing energy consumption, regulating chemical use and sludge comprehensive utilization are the key to carbon emission reduction. It further proposes that the development of wastewater treatment discharge standards should fully consider the comprehensive utilization of water quality classification. Regions with favorable natural conditions should make full use of their advantages by adopting economically feasible, low-energy-consuming technologies such as constructed wetlands, which offer carbon sequestration and landscaping benefits. This study provides guidance on the selection of technological pathways for pollution reduction and carbon mitigation in the wastewater treatment industry and on achieving sustainable water resource utilization.
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  • 文章类型: Journal Article
    来自废弃锂离子电池(LIB)的大量阳极石墨,作为一种被低估的城市矿山,具有巨大的资源回收潜力。在这里,我们提出了一种将低温热解和机械化学技术结合在一起的良性工艺,以从报废LIB中循环使用的石墨(SG)。在500°C下的热解导致约82.2%的PVDF在热处理的石墨(TG)中离解。通过尿素辅助的球磨进行固相剥离成功地在机械化学处理的石墨(MG)的边缘产生了大量的石墨薄片和少量的单层石墨烯纳米片。随后的冲洗除去残留的LiF盐。制备的MG的高纯度和独特的边缘结构特征为锂离子的嵌入和脱嵌提供了更多的活性位点和存储库,导致锂离子扩散动力学增强,优异的可逆比容量和理想的倍率能力。鼓舞人心,MG在第一次充放电期间表现出显着增强的521.3mAhg-1的初始比充电容量,并且仅从569.9mAhg-1下降到538mAhg-1,在0.1A/g的连续50次循环后略有衰减,表明令人满意的循环稳定性。此外,详细阐述了MG的纯化和重建机理。本研究提供了从LIB重建和升级阳极石墨的绿色策略,可以实现可持续的废物管理。
    Vast quantities of anode graphite from waste lithium ion batteries (LIBs), as a type of underrated urban mine, has enormous potential to be exploited for resource recovery. Herein, we propose a benign process integrating low-temperature pyrolysis and mechanochemical techniques to upcycle spent graphite (SG) from end-of-life LIBs. Pyrolysis at 500 °C leads to about 82.2 % PVDF dissociation in thermal treated graphite (TG). Solid-phase exfoliation via ball milling assisted by urea successfully produces abundant graphite flakes and a small amount of monolayer graphene nanosheet at the edge of mechanochemically processed graphite (MG). Subsequent rinsing removes the residual LiF salts. High purity and unique edge structural features of the as-prepared MG offer more active sites and storage reservoir for intercalation and de-intercalation of lithium ions, resulting in enhanced lithium-ion diffusion kinetics, excellent reversible specific capacity and desirable rate capability. Inspiringly, MG exhibits a remarkably enhanced initial specific charge capacity of 521.3 mAh g-1 during the first charge-discharge, and only declines from 569.9 mAh g-1 to 538 mAh g-1 with slight attenuation after 50 consecutive cycles at 0.1 A/g, indicating satisfactory cycle stability. Additionally, the purification and reconstruction mechanism for MG have been illustrated in detail. This study offers a green strategy to reconstruct and upgrade anode graphite from LIBs, which can realize sustainable waste management.
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  • 文章类型: Journal Article
    目的:确定Gleason评分(GS)7升级对前列腺癌根治术(RP)的临床意义及其对患者预后的影响。
    方法:我们使用了监测,流行病学,和最终结果(SEER)数据库研究了2010年至2015年被RP治疗的8832名诊断为M0GS3+4/4+3前列腺癌(PCa)的男性。采用Logistic回归分析临床病理特征对Gleason疮升级的影响。进行Cox风险回归分析以找到总生存期(OS)的重要因素。
    结果:共纳入6237例(70.6%)活检GS3+4患者和2595例(29.4%)活检GS4+3患者。单因素和多因素logistic回归分析发现,前列腺特异性抗原(PSA)>20ng/ml,T分期3~4期、淋巴结转移是预测RP后GS升高的独立危险因素(均P<0.05)。通过多变量分析,我们发现黑人种族,GS升级,化疗在预测不良OS方面具有显著作用(均P<0.05)。令人惊讶的是,PSA为0-4ng/ml和4.1-10ng/ml的患者的活检GS升级与不良OS显着相关(均P<0.05)。多因素分析显示,仅在PSA为4-10ng/ml的患者中,活检GS升级与不良OS有统计学重要关系(P=0.046).
    结论:并非所有GS7升级的患者的预后都比没有GS升级的患者差。仅在PSA为4.1-10ng/ml的患者中,活检GS7升级是影响OS的独立危险因素。
    To determine the clinical significance of Gleason score(GS) 7 upgraded on radical prostatectomy(RP) and its impact on the prognosis of patients.
    We used the Surveillance, Epidemiology, and End Results (SEER) database to study 8832 men diagnosed with M0 GS 3+4/4+3 prostate cancer (PCa) from 2010 to 2015 treated by RP. Logistic regression was used to analyze the effect of clinicopathological characteristics on the Gleason sore upgraded. Cox hazards regression analysis was performed to find significant factors of overall survival (OS).
    A total of 6237 (70.6%) biopsy GS 3+4 patients and 2595(29.4%) biopsy GS 4+3 patients were included in the study. Univariate and multivariate logistic regression analysis found that prostate-specific antigen (PSA)>20ng/ml, T stage 3-4, lymph node metastasis are independent risk factors in predicting the incidence of GS upgraded after RP (all P<0.05). Through multivariate analysis, we found that black race, GS upgraded, chemotherapy played significant roles in predicting poor OS (all P<0.05). It was surprising to find that the biopsy GS upgraded in patients with PSA 0-4ng/ml and 4.1-10ng/ml had a significant association with poor OS (all P<0.05). Multivariate analysis showed that only in patients with PSA 4-10ng/ml, biopsy GS upgrade had a statistically important relationship with poor OS (P=0.046).
    Not all patients with GS 7 upgraded had a worse prognosis than those without GS upgraded. Only in patients with PSA 4.1-10ng/ml, biopsy GS 7 upgraded was an independent risk factor affecting OS.
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  • 文章类型: Journal Article
    开发水稻新品种需要巨大的努力和多年的投入。与选育新品种相比,改善优良品种的缺陷性状更具成本和时间效益。孔玉131是早熟的高产粳稻品种,高产,广泛的适应性和耐寒性,但是抗倒伏性差阻碍了中国东北地区孔玉131的工业生产。在这项研究中,我们试图从基因和性状两个角度提高孔玉131的抗倒伏性。一方面,通过QTL分析和精细定位,我们发现了候选基因位点。随后的CRISPR/Cas9和转基因互补研究证实,Sd1主导了抗倒伏性,并挖掘了有利的等位基因以进行精确的引入和改进。另一方面,通过序列比对在孔玉131中鉴定出Sd1等位基因变体,然后通过回交引入另一个优秀的等位基因变异。然后,两个新产生的孔玉131在不同环境下进行了现场评估,种植密度和氮肥条件。结果表明,升级后的孔玉131的株高比孔玉131低17%-26%,而产量不受影响。本研究从育种的角度展示了一种通过仅改善少数基因缺陷来更新水稻基因组和升级优良水稻品种的精确和有针对性的方法。
    Developing a new rice variety requires tremendous efforts and years of input. To improve the defect traits of the excellent varieties becomes more cost and time efficient than breeding a completely new variety. Kongyu 131 is a high-performing japonica variety with early maturity, high yield, wide adaptability and cold resistance, but the poor-lodging resistance hinders the industrial production of Kongyu 131 in the Northeastern China. In this study, we attempted to improve the lodging resistance of Kongyu 131 from perspectives of both gene and trait. On the one hand, by QTL analysis and fine mapping we discovered the candidate gene loci. The following CRISPR/Cas9 and transgenic complementation study confirmed that Sd1 dominated the lodging resistance and favourable allele was mined for precise introduction and improvement. On the other hand, the Sd1 allelic variant was identified in Kongyu 131 by sequence alignment, then introduced another excellent allelic variation by backcrossing. Then, the two new resulting Kongyu 131 went through the field evaluation under different environments, planting densities and nitrogen fertilizer conditions. The results showed that the plant height of upgraded Kongyu 131 was 17%-26% lower than Kongyu 131 without penalty in yield. This study demonstrated a precise and targeted way to update the rice genome and upgrade the elite rice varieties by improving only a few gene defects from the perspective of breeding.
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  • 文章类型: Journal Article
    公众对污水处理厂(WWTP)中抗生素抗性基因(ARGs)的流行和传播越来越关注。特别是ARG在活性污泥(AS)中的持久性和传播。然而,长时间内污水处理厂AS中ARG的时间动态及其在处理工艺升级后的转移潜力(例如,废水中总氮从20毫克/升减少到15毫克/升)的探索仍然很少。这里,进行宏基因组测序以量化来自两个经过2年不同处理过程的WWTP的AS样品中的ARG。在两个WWTP中分别鉴定了与20种ARG类型相关的368种和426种ARG亚型,所有54个样本共享相似的核心ARG。不同处理过程中ARG成分存在显著差异,然而,AS样本中ARGs的丰度和多样性没有明显的季节性模式。值得注意的是,处理工艺升级后,磺胺的相对丰度,β-内酰胺,氨基糖苷类耐药基因减少了10%以上,ARGs在细菌性病原体中的转移潜力大大降低,这表明升级可能会限制ARGs的流行和传播。变异分配分析表明,金属抗性基因而不是细菌群落代表了形成ARGs的显着影响因素。通过网络分析确定了与ARGs相关的一些关键属。这些结果将加深我们对AS系统中ARG剖面动态变化的理解,并指导废水处理厂的升级。关键点:•在处理工艺升级后,ARGs的潜在转移降低•金属抗性基因是形成ARG组成的最有影响的因素•共现网络显示β-内酰胺抗性基因的潜在宿主。
    Public concerns are increasing regarding the prevalence and transmission of antibiotic resistance genes (ARGs) in wastewater treatment plants (WWTPs), especially ARG persistence and dissemination in activated sludge (AS). However, the temporal dynamics of ARGs in the AS of WWTPs over a long period of time and their transfer potential after the treatment process upgrade (e.g., total nitrogen reduction from 20 to 15 mg/L in effluent) remain poorly explored. Here, metagenomic sequencing was performed to quantify the ARGs in AS samples from two WWTPs with different treatment processes over a 2-year period. A total of 368 and 426 ARG subtypes affiliated with 20 ARG types were identified separately in the two WWTPs and the similar core ARGs were shared by all 54 samples. There were significant differences in ARG composition in different treatment processes, yet the abundance and diversity of ARGs in the AS samples demonstrated no distinct seasonal patterns. Notably, after the treatment process upgrade, the relative abundance of sulfonamide, beta-lactam, and aminoglycoside resistance genes was reduced by more than 10%, and the transfer potential of ARGs in bacterial pathogens decreased greatly, which suggested that an upgrade could limit the prevalence and transmission of ARGs. Variation partitioning analysis showed that metal resistance genes rather than bacterial community represented the significantly influential factor in shaping ARGs, and some key genera correlated with ARGs were identified through network analysis. These results will deepen our understanding of the dynamic changes in ARG profiles in AS systems and guide wastewater treatment plant upgrades. KEY POINTS: • The potential transfer of ARGs decreased after the treatment process upgrade • Metal resistance genes were the most influential factor in shaping ARG composition • Co-occurrence networks displayed potential hosts of beta-lactam resistance genes.
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  • 文章类型: Journal Article
    UNASSIGNED:本研究旨在评估从系统和MRI靶向联合前列腺活检到最终病理的病理一致性,并验证具有靶向活检(TB)特征的基于机器学习的模型在预测病理升级方面的有效性。
    未经评估:本研究中的所有患者均接受了前列腺多参数MRI(mpMRI),局部麻醉下经会阴系统加经会阴靶向前列腺活检,2016年10月至2020年2月在两个转诊中心依次进行机器人辅助腹腔镜前列腺癌根治术(RARP).对于患有癌症的核心,使用2014年国际泌尿外科病理学会(ISUP)指南确定患者的等级组(GG)和Gleason评分.采用了四种监督机器学习方法,包括两个基本分类器和两个基于集成学习的分类器。在所有分类器中,训练集是565名患者中的395名(70%),而测试组是其余170名患者。通过接收器工作特征曲线下面积(AUC)评估每个模型的预测性能。Gini指数用于评估所有功能的重要性,并找出贡献最大的功能。建立了列线图以直观地预测升级的风险。预测概率是通过建议的列线图计算的患病率。
    UNASSIGNED:共有515名患者纳入我们的队列。联合活检比仅进行系统活检(SB)具有更好的术后组织病理学一致性(48.15%vs.40.19%,p=0.012)。联合活检可显著降低术后病理升级率,与仅SB相比(23.30%与39.61%,p<0.0001)或仅TB(23.30%与40.19%,p<0.0001)。最常见的病理升级发生在ISUPGG1和GG2,分别占53.28%和20.42%。分别。所有机器学习方法均具有令人满意的预测效果。逻辑回归的总体准确度为0.703、0.768、0.794和0.761,随机森林,极限梯度提升,和支持向量机,分别。与TB相关的特征是升级预测的预测模型中贡献最大的特征之一。
    UNASSIGNED:SB加TB的联合作用导致更好的病理一致性率和从活检到RP的升级较少。具有TB特征的机器学习模型预测PCaGG升级具有令人满意的预测功效。
    UNASSIGNED: This study aimed to evaluate the pathological concordance from combined systematic and MRI-targeted prostate biopsy to final pathology and to verify the effectiveness of a machine learning-based model with targeted biopsy (TB) features in predicting pathological upgrade.
    UNASSIGNED: All patients in this study underwent prostate multiparametric MRI (mpMRI), transperineal systematic plus transperineal targeted prostate biopsy under local anesthesia, and robot-assisted laparoscopic radical prostatectomy (RARP) for prostate cancer (PCa) sequentially from October 2016 to February 2020 in two referral centers. For cores with cancer, grade group (GG) and Gleason score were determined by using the 2014 International Society of Urological Pathology (ISUP) guidelines. Four supervised machine learning methods were employed, including two base classifiers and two ensemble learning-based classifiers. In all classifiers, the training set was 395 of 565 (70%) patients, and the test set was the remaining 170 patients. The prediction performance of each model was evaluated by area under the receiver operating characteristic curve (AUC). The Gini index was used to evaluate the importance of all features and to figure out the most contributed features. A nomogram was established to visually predict the risk of upgrading. Predicted probability was a prevalence rate calculated by a proposed nomogram.
    UNASSIGNED: A total of 515 patients were included in our cohort. The combined biopsy had a better concordance of postoperative histopathology than a systematic biopsy (SB) only (48.15% vs. 40.19%, p = 0.012). The combined biopsy could significantly reduce the upgrading rate of postoperative pathology, in comparison to SB only (23.30% vs. 39.61%, p < 0.0001) or TB only (23.30% vs. 40.19%, p < 0.0001). The most common pathological upgrade occurred in ISUP GG1 and GG2, accounting for 53.28% and 20.42%, respectively. All machine learning methods had satisfactory predictive efficacy. The overall accuracy was 0.703, 0.768, 0.794, and 0.761 for logistic regression, random forest, eXtreme Gradient Boosting, and support vector machine, respectively. TB-related features were among the most contributed features of a prediction model for upgrade prediction.
    UNASSIGNED: The combined effect of SB plus TB led to a better pathological concordance rate and less upgrading from biopsy to RP. Machine learning models with features of TB to predict PCa GG upgrading have a satisfactory predictive efficacy.
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  • 文章类型: Journal Article
    探讨血清炎症标志物白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)对前列腺癌(PCa)患者行前列腺癌根治术(RP)后Gleason评分(GS)变化的影响。我们进行了这项研究。
    从2012年11月到2021年9月,共有237名患者在我们机构接受了RP。手术前1周内收集所有患者的血样。术前临床特征包括年龄,血清IL-6和TNF-α,中性粒细胞与淋巴细胞的比率,C反应蛋白,血小板与淋巴细胞的比率,淋巴细胞与单核细胞的比率,全身免疫炎症指数,前列腺影像学报告和数据系统(PI-RADS)评分,前列腺特异性抗原,和活检GS进行评估。采用单因素和多因素logistic回归分析确定RP后GS变化的危险因素。该预测模型的效率通过接收器工作特性曲线的曲线下面积来确定。
    在整个队列中,73例患者(30.8%)的GS升高,55例患者(23.2%)GS降级.在比较有和没有GS升级的PCa患者时,多因素logistic回归分析显示,血清TNF-α(比值比[OR]:2.518,p=0.019)和IL-6(OR:0.478,p=0.023)是GS发生的独立预测因素。我们还比较了GS升级和GS降级的患者的特征;多因素logistic回归分析也显示了这两组之间血清IL-6和TNF-α的显着差异(均p<0.05)。此外,在多变量分析中,我们发现低前列腺体积和活检GS≥7与较高PI-RADS溃疡显著相关.
    PCa患者血清TNF-α高表达与GS升高呈正相关。PCa患者血清IL-6高表达水平与GS升高呈负相关,与GS降低呈正相关。
    To study the effect of inflammatory markers in blood such as interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) on the Gleason score (GS) changes in patients with prostate cancer (PCa) after radical prostatectomy (RP), we conducted this study.
    From November 2012 to September 2021, a total of 237 patients underwent RP at our institution. Blood samples from all patients were collected within 1 week before surgery. Preoperative clinical characteristics include age, serum IL-6 and TNF-α, neutrophil-to-lymphocyte ratio, C-reactive protein, the platelet-to-lymphocyte ratio, lymphocyte-to-monocyte ratio, systemic immune-inflammation index, the prostate imaging reporting and data system (PI-RADS) score, prostate-specific antigen, and biopsy GS were assessed. Univariate and multivariate logistic regression analyzes were used to determine the risk factors of GS changes after RP. The efficiency of this prediction model was identified with the area under the curve of the receiver operating characteristic curve.
    Seventy-three patients (30.8%) had GS upgraded in the overall cohort, and 55 patients (23.2%) had GS downgraded. In comparing PCa patients with and without GS upgraded, multivariate logistic regression analysis showed that serum TNF-α (odds ratio [OR]: 2.518, p = 0.019) and IL-6 (OR: 0.478, p = 0.023) were independent factors predicting the occurrence of GS upgrade. We also compared the characteristics of patients with GS upgraded and GS downgraded; multivariate logistic regression analysis also demonstrated significant differences in serum IL-6 and TNF-α between these two groups (all p < 0.05). In addition, we found that low prostate volume and biopsy GS ≥ 7 were significantly associated with higher PI-RADS sores in multivariate analysis.
    The high expression of serum TNF-α level is positively correlated with GS upgraded in PCa patients. High expression of serum IL-6 level is negatively correlated with GS upgraded in PCa patients and positively related with GS downgraded.
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  • 文章类型: Case Reports
    We report a case of atrioventricular junction (AVJ) pacing in a patient with Ebstein\'s anomaly (EA). The patient was a 68-year-old man who suffered from pacemaker syndrome and complained of heart failure symptoms. He was initially diagnosed with EA in his thirties and received right ventricular (RV) apex pacing for safe during a surgery because of low heart rate atrial fibrillation (AF) 9 years ago. However, since the patient felt discomfort, the pacing rate was then programed down to 45-55 per/min. During recent years, he was often admitted for dyspnea, dizziness, or edema and was advised to undergo intracardiac repair, but he rejected this due to the high risk of the surgery. We believed that the patient\'s low heart rate and ventricular pacing burden (47.8%) might be important causes of the symptoms. Therefore, we suggested that the patient undergo an upgrade of the pacing mode. In consideration of possible abnormal cardiac coronary veins, we tried His bundle pacing (HBP) to upgrade pacing. However, the SelectSecure 3830 lead was fixed at the AVJ region and obtained steady pacing parameters. After the upgrading of the AVJ pacing mode. The patient\'s symptoms, exercise capacity and quality of life were all improved at the 2-year follow-up. Thus, we presented the first case of AVJ pacing in a patient with EA.
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  • 文章类型: Journal Article
    UNASSIGNED: The rate of carcinoma upgrade for atypical ductal hyperplasia (ADH) diagnosed on core needle biopsy (CNB) is variable on open excision. The purpose of the present study was to develop and validate a simple-to-use nomogram for predicting the upgrade of ADH diagnosed with ultrasound (US)-guided core needle biopsy in patients with US-detected breast lesions.
    UNASSIGNED: Two retrospective sets, the training set (n = 401) and the validation set (n = 186), from Fudan University Shanghai Cancer Center between January 2014 and December 2019 were retrospectively analyzed. Clinicopathological and US features were selected using univariate and multivariable logistic regression, and the significant features were incorporated to build a nomogram model. Model discrimination and calibration were assessed in the training set and validation set.
    UNASSIGNED: Of the 587 ADH biopsies, 67.7% (training set: 267/401, 66.6%; validation set: 128/186, 68.8%) were upgraded to cancers. In the multivariable analysis, the risk factors were age [odds ratio (OR) 2.739, 95% confidence interval (CI): 1.525-5.672], mass palpation (OR 3.008, 95% CI: 1.624-5.672), calcifications on US (OR 4.752, 95% CI: 2.569-9.276), ADH extent (OR 3.150, 95% CI: 1.951-5.155), and suspected malignancy (OR 4.162, CI: 2.289-7.980). The model showed good discrimination, with an area under curve (AUC) of 0.783 (95% CI: 0.736-0.831), and good calibration (p = 0.543). The application of the nomogram in the validation set still had good discrimination (AUC = 0.753, 95% CI: 0.666-0.841) and calibration (p = 0.565). Instead of surgical excision of all ADHs, if those categorized with the model to be at low risk for upgrade were surveillanced and the remainder were excised, then 63.7% (37/58) of surgeries of benign lesions could have been avoided and 78.1% (100/128) malignant lesions could be treated in time.
    UNASSIGNED: This study developed a simple-to-use nomogram by incorporating clinicopathological and US features with the overarching goal of predicting the probability of upgrade in women with ADH. The nomogram could be expected to decrease unnecessary surgery by nearly two-third and to identify most of the malignant lesions, helping guide clinical decision making with regard to surveillance versus surgical excision of ADH lesions.
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  • 文章类型: Journal Article
    Pacing-induced cardiomyopathy (PICM) or heart failure accompanied with chronic right ventricular pacing (CRVP-HF) has no established treatments. We aimed to carry out a meta-analysis of published studies about the therapeutic effects of the upgrade to cardiac resynchronization therapy (CRT) in patients of PICM/CRVP-HF. The PUBMED, EMBASE, MEDLINE, OVID databases, and Cochrane Library were systemically searched for relevant publications. Data about the improvements of left ventricular ejection fraction (LVEF), NYHA functional class (NYHA-FC), and the CRT response rate was extracted and synthesized. Mean difference (MD), odds ratio, and standard mean difference (SMD) with 95% confidence interval (CI) were calculated as the effect size by both fixed and random effect models. We included sixteen studies (four about PICM and twelve about CRVP-HF). The total sample size of PICM/CRVP-HF patients was 924. Upgrade to CRT improved the LVEF by 10.87% (95%CI, 8.90 to 12.84%) and reduce the NYHA-FC by around one class (MD, -1.25; 95%CI, -1.43 to -1.06) in PICM/CRVP-HF patients overall. Upgrade to CRT seemed to improve LVEF no less than de-novo CRT (SMD 0.24; 95%CI 0.05 to 0.43; P < 0.05). This meta-analysis suggested that upgrade CRT could improve the cardiac function in PICM/CRVP-HF patients. This strategy may be considered in these patients but require more evidence about the efficacy and procedure-related complications from prospective studies or randomized controlled trials.
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