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1.
A Critical Period of Ventricular Fibrillation More Susceptible to Defibrillation: Real-Time Waveform Analysis Using a Single ECG Lead 总被引:1,自引:0,他引:1
PENG-WIE E. HSIA SYLVIA FRERK CYNTHIA A. ALLEN ROBERT M. WISE NERI M. COHEN RALPH J. DAMIANO Jr . 《Pacing and clinical electrophysiology : PACE》1996,19(4):418-430
Previous studies have suggested that variations in the underlying ventricular fibrillation (VF) waveform may be one of the factors responsible for the probabilistic nature of defibrillation. The heart appeared to be more susceptible to defibrillation at higher absolute VF voltages (AVFV). This study investigated in an open-chest canine model (n = 8), a newly developed system that analyzed the VF waveform in real-time, instantaneously determined the time to shock, and immediately delivered a fixed low energy DC shock. A two parameter tracking technique using a running long-term and short-term AVFV average was devised to automatically identify a high voltage peak area of the VF waveform, which has been hypothesized to represent a critical period susceptible to defibrillation. Using a DC shock estimated at the 50% success level, the performance using this technique in 58 defibrillation trials was compared to the performance of the conventional method of shocking at a fixed time (random shock method) in 62 trials. Patch size, electrode location, and discharge voltage were kept constant while VF duration, transmyocardial resistance (TMR), energy delivered, and AVFV at the point of shock were measured. Shock energy and current, TMR, and VF duration were similar with both shock methods. A significantly higher AVFV was observed for trials performed with the peak shock method (0.66 ± 0.02 mV) as compared to trials performed with the random shock method (0.25 ± 0.09 mV) (P < 0.003). Using lead II as the only sensing lead, the success rate was increased in 6 of 8 dogs (75%) with the new method. One animal showed identical performance, and one animal a worse performance. The overall increase in success rate was 24% using a single ECG lead (range 0%-100%; P < 0.04). Our data document that using this algorithm a period of high VF voltage can be detected in realtime. The improved success in the majority of animals supports the hypothesis that a critical period susceptible to defibrillation exists during VF. However, the high AVFV detected using a single ECG lead did not translate to an improved success rate in all animals. This suggests that other factors in addition to the VF voltage measured on a single lead of the ECG are important in characterizing this critical period. 相似文献
2.
目的:分析ST 段抬高心肌梗死在急诊冠脉介入中发生室颤(VF)的临床特征和冠脉造影特点.方法:对50例接受急诊冠脉介入治疗的ST段抬高心肌梗死患者进行回顾性研究,根据术中有无室颤将患者分为两组,其中9例发生心室颤动(VF组),41例患者没有发生心室颤动(无VF组).比较两组的临床特征与冠脉造影的差异.结果:两组患者的基线特征相似.VF组冠脉内溶栓占33.3%,无VF组冠脉内溶栓2.4%,两组统计学上有显著性差异(P<0.05).VF组三支病变占77.7%,无VF组占33.3%,两组统计学上有显著性差异(P<0.05).结论:(1)在ST段抬高的心梗患者在急诊冠脉介入时室颤发生可能与冠脉内急性闭塞处血栓负荷有关.(2)在ST段抬高的心梗患者在急诊冠脉介入时室颤发生与冠脉病变严重程度有关. 相似文献
3.
Yoav Michowitz Anat Milman Antoine Andorin Georgia Sarquella-Brugada M. Cecilia Gonzalez Corcia Jean-Baptiste Gourraud Giulio Conte Frederic Sacher Jimmy J.M. Juang Sung-Hwan Kim Eran Leshem Philippe Mabo Pieter G. Postema Aviram Hochstadt Yanushi D. Wijeyeratne Isabelle Denjoy Carla Giustetto Yuka Mizusawa Bernard Belhassen 《Journal of the American College of Cardiology》2019,73(14):1756-1765
Background
Information on young patients with Brugada syndrome (BrS) and arrhythmic events (AEs) is limited.Objectives
The purpose of this study was to describe their characteristics and management as well as risk factors for AE recurrence.Methods
A total of 57 patients (age ≤20 years), all with BrS and AEs, were divided into pediatric (age ≤12 years; n = 26) and adolescents (age 13 to 20 years; n = 31).Results
Patients’ median age at time of first AE was 14 years, with a majority of males (74%), Caucasians (70%), and probands (79%) who presented as aborted cardiac arrest (84%). A significant proportion of patients (28%) exhibited fever-related AE. Family history of sudden cardiac death (SCD), prior syncope, spontaneous type 1 Brugada electrocardiogram (ECG), inducible ventricular fibrillation at electrophysiological study, and SCN5A mutations were present in 26%, 49%, 65%, 28%, and 58% of patients, respectively. The pediatric group differed from the adolescents, with a greater proportion of females, Caucasians, fever-related AEs, and spontaneous type-1 ECG. During follow-up, 68% of pediatric and 64% of adolescents had recurrent AE, with median time of 9.9 and 27.0 months, respectively. Approximately one-third of recurrent AEs occurred on quinidine therapy, and among the pediatric group, 60% of recurrent AEs were fever-related. Risk factors for recurrent AE included sinus node dysfunction, atrial arrhythmias, intraventricular conduction delay, or large S-wave on ECG lead I in the pediatric group and the presence of SCN5A mutation among adolescents.Conclusions
Young BrS patients with AE represent a very arrhythmogenic group. Current management after first arrhythmia episode is associated with high recurrence rate. Alternative therapies, besides defibrillator implantation, should be considered. 相似文献4.
David D. Berg Muthiah Vaduganathan Gaurav A. Upadhyay Jagmeet P. Singh Mandeep R. Mehra Garrick C. Stewart 《Journal of the American College of Cardiology》2018,71(13):1483-1493
Recent progress and evolution in device engineering, surgical implantation practices, and periprocedural management have advanced the promise of durable support with left ventricular assist systems (LVAS) in patients with stage D heart failure. With greater uptake of LVAS globally, a growing population of LVAS recipients have pre-existing cardiac implantable electronic devices (CIEDs). Strategies for optimal clinical management of CIEDs in patients with durable LVAS are evolving, and clinicians will increasingly face complex decisions regarding implantation, programming, deactivation, and removal of CIEDs. Traditional decision-making pathways for CIEDs may not apply to LVAS-supported patients, as few patients die of arrhythmic causes and many arrhythmias may be well tolerated. Given limited data, treatment decisions must be individualized and made collaboratively among electrophysiologists, advanced heart failure specialists, and patients and their caregivers. Large, prospective, well-conducted studies are needed to better understand the contemporary utility of CIEDs in patients with newer-generation LVAS. 相似文献
5.
Gardiwal Ajmal; Yu Hong; Oswald Hanno; Luesebrink Ulrich; Ludwig Andreas; Pichlmaier Andreas Maximilian; Drexler Helmut; Klein Gunnar 《Europace : European pacing, arrhythmias, and cardiac electrophysiology》2008,10(3):358-363
Aims: There is increasing evidence that right ventricular (RV) pacingmay have detrimental effects by increasing morbidity and mortalityfor heart failure in implantable cardioverter–defibrillator(ICD) patients. In this study we prospectively tested the hypothesisthat cumulative RV pacing increases ventricular tachycardia/ventricularfibrillation (VT/VF) occurrence (primary endpoint) and hospitalizationand mortality for heart failure (secondary endpoint) in a predominantlysecondary prophylactic ICD patient population. Methods and results: Two hundred and fifty patients were divided into two groupsaccording to the median of cumulative RV pacing (2 vs. >2%)and prospectively followed-up for occurrence of primary andsecondary endpoints for 18 ± 4 months. Established predictorsfor VT/VF occurrence and heart failure events such as age, leftventricular ejection fraction (EF), QRS duration, history ofatrial fibrillation, and NT-proBNP were collected at enrolment.Multivariate Cox regression analysis revealed that cumulativeRV pacing > 2% and EF < 40% were independent predictorsfor VT/VF occurrence and heart failure events. Kaplan–Meieranalysis showed that patients with >2% cumulative RV pacingmore frequently suffered from VT/VF occurrence and heart failurehospitalization. Conclusion: Cumulative RV pacing > 2% and EF < 40% are independentpredictors for VT/VF occurrence and mortality and hospitalizationfor heart failure in predominantly secondary prophylactic ICDpatients. Our data show that algorithms capable of reducingcumulative RV pacing should be used more frequently in clinicalpractice. 相似文献
6.
Effect of defibrillation threshold testing on effectiveness of the subcutaneous implantable cardioverter defibrillator 下载免费PDF全文
7.
Ye Ma Lili Huang Lu Zhang Hai Yu Bin Liu 《The American journal of emergency medicine》2018,36(7):1270-1279
Background
Obesity as one of the risk factors for cardiovascular diseases increases mortality in general population. Several clinical studies investigated clinical outcomes in patients with different body mass index (BMI) after cardiac arrest (CA). Controversial data regarding BMI on clinical outcomes in those patients exist in those studies. Therefore, we conducted a meta-analysis to evaluate the effect of BMI on survival condition and neurological prognosis in those patients.Methods
We searched Pubmed, Embase, Ovid/Medline and EBM reviews databases for relational studies investigating the association between BMI and clinical outcomes of patients after CA. Seven studies involving 25,035 patients were included in this meta-analysis. Primary outcome was survival condition and secondary outcome was neurological prognosis. Three comparisons were conducted: underweight (BMI < 18.5) versus normal weight (18.5 ≤ BMI < 25), overweight (25 ≤ BMI < 30) versus normal weight and obese (BMI ≥ 30) versus normal weight.Results
Using normal weight patients as reference, underweight patients had a higher mortality (odds ratio [OR] 1.35; 95% confidence interval [CI] 1.10 to 1.66; P = 0.004; I2 = 17%). Overweight was associated with increased hospital survival (OR 0.80; 95% CI 0.65 to 0.98; P = 0.03; I2 = 62%) and better neurological recovery (OR 0.72; 95% CI 0.61 to 0.85; P < 0.001; I2 = 0%). No significant difference was found in clinical outcomes between obese and normal weight patients.Conclusions
Low BMI was associated with lower survival rate in CA patients. Overweight was associated with a higher survival rate and better neurological recovery. Clinical outcomes did not differ between obese and normal weight patients. Further studies are needed to explore the underlying mechanisms. 相似文献8.
目的探讨自然周期IVF结合未成熟卵母细胞IVM(自然周期IVF/IVM)和IVM技术与控制性促排卵技术(COH)相比,在不孕症治疗中的临床价值。方法根据筛查标准,将患者治疗方案分为以下3种类型:(A)自然周期IVF/IVM;(B)IVM;(C)COH。结果在1686个移植周期中,31.3%的周期(528个)应用自然周期IVF/IVM技术,12.8%实施IVM技术,55.9%通过COH方案治疗。自然周期IVF/IVM、IVM和COH的临床妊娠率分别为33.9%、39.8%和31.1%,IVM组高于其他两组但各组之间无显著差异,胚胎着床率也无显著差异。而IVM组的流产率(36.0%)高于其他两组(31.3%和25.9%),无显著统计学差异。结论从本研究可以看出,自然周期IVF/IVM和IVM方案可以解决近一半周期的不孕症患者,并且可以获得与COH相近的临床妊娠率。 相似文献
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